How to Value a Law Firm

Valuing a law firm is not as simple as applying a percentage to annual revenue or copying a multiple from another professional-services transaction. A law firm is a regulated professional practice with client trust obligations, attorney licensing requirements, referral relationships, work-in-process, accounts receivable, case costs, reputation, systems, and people-driven goodwill. The result is a business valuation assignment where the central question is not merely “what did the firm bill last year?” The better question is: what future economic benefit can transfer to the subject ownership interest, and how risky is that benefit?

A defensible law firm valuation should start with the purpose of the engagement, the standard of value, the subject ownership interest, the valuation date, and the information reasonably available as of that date. Professional valuation standards and valuation-service frameworks emphasize a disciplined process, relevant data, reasoned methods, and clear assumptions rather than a single universal formula (AICPA-CIMA, n.d.; NACVA, n.d.; The Appraisal Foundation, n.d.). For a law firm, that process must be adapted to the realities of professional judgment, attorney relationships, client choice, confidentiality, state ethics rules, fee arrangements, and the difference between enterprise goodwill and personal goodwill.

This guide explains how to value a law firm using the income approach, market approach, and asset approach. It also explains how EBITDA can be useful, why discounted cash flow analysis may be needed for changing or contingency-fee practices, how to analyze WIP and accounts receivable, and how to avoid common mistakes that make a business appraisal less reliable. The examples are hypothetical and are included to show valuation mechanics, not to provide rules of thumb, legal advice, tax advice, or a conclusion about any specific law practice.

Quick Answer: What Drives a Law Firm’s Value?

The value of a law firm is usually driven by transferable earnings and cash flow, adjusted for risk. Transferable earnings are not the same thing as gross revenue, partner draws, taxable income, or bank balance. A buyer, incoming partner, retiring partner, court, lender, or planning adviser needs to understand how much of the firm’s economic engine can continue without the current owner performing every critical role.

Important value drivers include normalized partner compensation, recurring clients, diversified referral channels, documented processes, attorney bench strength, collections, WIP quality, realization rates, case pipeline, technology, marketing systems, management depth, and the terms under which clients and employees may transition. A firm with lower revenue but durable institutional relationships can be more valuable than a firm with higher revenue that depends almost entirely on one rainmaker who plans to retire immediately after closing.

The right valuation methods depend on the fact pattern. A stable multi-attorney firm with recurring business clients may support a capitalized cash flow method. A rapidly changing firm, a firm with a retiring founder, or a contingency-fee practice with uncertain case outcomes may require a discounted cash flow model. A distressed, dissolving, or highly owner-dependent solo practice may require substantial weight on the asset approach. The market approach can be helpful when comparable transaction data are reliable, but law-firm comparability is often difficult because practice area, geography, client transferability, compensation structure, and deal terms vary widely.

If you need a professional business appraisal for a law firm, Simply Business Valuation can help organize the analysis, normalize earnings, evaluate transferability and risk, and present a clear valuation conclusion for the intended purpose.

Practical Law-Firm Valuation Scenarios

Scenario	Typical valuation focus	Methods likely emphasized	Special risks
Solo owner-dependent practice	Whether earnings can transfer after the owner exits	Asset approach; income approach only if transferable cash flow is supportable	Personal goodwill, client retention, seller transition
Multi-partner firm	Normalized partner economics, recurring work, and governance	Income approach with market approach as a check when reliable	Partner departures, compensation disputes, client concentration
Contingency-fee firm	Case inventory, expected cash flows, case costs, and timing	Discounted cash flow, probability-weighted scenarios, asset check	Outcome risk, timing risk, concentration in one matter
Recurring outside-counsel boutique	Retention of business clients and repeatable service model	Capitalized cash flow or discounted cash flow, market check	Client concentration, renewal assumptions, attorney capacity
Distressed or dissolving practice	Net recoverable assets and liabilities	Asset approach	A/R collectability, lease obligations, malpractice tail, client files

Start With the Valuation Assignment, Not a Multiple

A reliable law firm valuation begins with assignment design. Before selecting valuation methods, the analyst should define the purpose of the valuation, the standard of value, the premise of value, the subject interest, the valuation date, the intended users, the level of report, and the scope of work. This is not administrative formality. These definitions can change the conclusion.

Professional valuation frameworks such as AICPA VS Section 100 and NACVA professional standards provide process-oriented guidance for valuation services, including the need to identify the subject interest, understand the engagement, analyze relevant information, and communicate assumptions and limitations (AICPA-CIMA, n.d.; NACVA, n.d.). USPAP and International Valuation Standards also reinforce that valuation opinions should be developed and communicated in a manner appropriate for the assignment, with attention to the intended use and relevant assumptions (International Valuation Standards Council, n.d.; The Appraisal Foundation, n.d.).

Define the Purpose and Standard of Value

Law firms are valued for many reasons: sale or acquisition, partner buy-in, partner buyout, death or disability, divorce, estate and gift planning, shareholder or member disputes, financing, internal succession planning, tax reporting, litigation, and strategic planning. The purpose matters because the valuation audience, documentation needs, and legal or contractual context may differ.

For example, a valuation for an internal partner buyout may be governed by a partnership agreement or operating agreement. A valuation for a sale may focus heavily on transferable cash flow, transaction structure, seller transition, and buyer-specific risks. A valuation for litigation may require strict attention to the legal standard specified by the court or applicable statute. A valuation for estate or gift planning may require tax-sensitive assumptions and qualified professional support. The valuation analyst should not assume that one answer fits every use.

The standard of value is equally important. Fair market value, fair value, investment value, strategic value, and contract-defined value can produce different analyses. A strategic buyer that can absorb administrative overhead may see a different economic benefit than a hypothetical buyer without those synergies. A minority interest subject to transfer restrictions may differ from a controlling interest in the entire firm. A professional business valuation should identify the standard being applied rather than silently mixing assumptions.

Identify the Subject Interest

The subject interest may be the whole firm, a controlling equity interest, a noncontrolling partner interest, a membership interest in a PLLC, an interest in an LLP, assets of a professional corporation, or a specific book of business. The valuation must also define whether the conclusion is enterprise value or equity value.

Enterprise value generally reflects the value of the operating business before considering certain financing items, depending on the convention used in the analysis. Equity value reflects value available to owners after considering debt and other equity-level adjustments. Confusing enterprise value with equity value is a common mistake. In law-firm transactions, the treatment of cash, debt, client retainers, trust funds, WIP, A/R, case costs, working capital, and partner capital accounts can materially affect the number that owners actually receive.

The analyst should also identify included and excluded assets. Are receivables included? Is WIP included? Are case costs reimbursable or speculative? Does the seller retain old A/R? Are client trust funds excluded? Are laptops, furniture, websites, phone numbers, and trade names included? Are malpractice claims, lease obligations, deferred revenue, tax liabilities, or compensation accruals deducted? These questions are not peripheral. They shape the valuation base.

Decide the Valuation Date and Available Information

The valuation date anchors the analysis. In a law firm, events near the valuation date can be especially important. A major client departure, partner withdrawal, large contingency case resolution, malpractice claim, merger negotiation, lease termination, regulatory change, or founder illness can change the expected cash flows and risks. The analyst should distinguish information known or knowable as of the valuation date from hindsight.

For a planning valuation, management may want scenarios that include later events, but those scenarios should be labeled clearly. For litigation or tax-sensitive assignments, the date and information standard may be more constrained. A valuation report that does not identify its date can create confusion about what was included in the analysis.

What Makes Law Firm Valuation Different From Other Business Valuation Work?

Law firms share many features with consulting firms, accounting firms, architecture firms, medical practices, and other professional-services businesses. They also have distinctive characteristics. A law firm’s value is tied to licensed professionals, client confidence, confidentiality, fiduciary-like obligations, reputation, conflicts rules, fee arrangements, and ethical restrictions. These features affect due diligence, buyer universe, transferability, and risk.

The Product Is Professional Judgment, Not Inventory

A manufacturer may own equipment, inventory, patents, and production lines. A retailer may own stock, leases, and customer data. A law firm’s most important economic asset is often the ability of its lawyers and staff to convert legal knowledge, judgment, and relationships into collected fees. That asset can be valuable, but it is not always fully transferable.

A buyer cannot automatically acquire client loyalty. Clients may have the right to choose counsel, terminate engagements, or move matters. Referral sources may follow a departing lawyer rather than the institution. Associates may leave if compensation or culture changes. A firm’s brand may continue, but only if there are systems, successor professionals, and client-facing continuity that support the transition.

This is why a valuation should analyze how revenue is generated, not only how much revenue was generated. A firm with documented intake processes, CRM data, strong online marketing, recurring business clients, multiple responsible attorneys, and trained staff has a different risk profile than a founder-centric firm where every significant matter comes through personal friendships of one lawyer.

Client Relationships May Not Be Freely Transferable

The sale of a law practice raises issues that are different from the sale of many ordinary businesses. ABA Model Rule 1.17 addresses sale-of-law-practice concepts at the model-rule level, but state rules vary and the applicable jurisdiction’s rules should be checked with ethics counsel or the responsible regulator (American Bar Association, n.d.-a). From a valuation perspective, the key point is that client transition may require notices, consents, or other procedures depending on the jurisdiction and circumstances. A valuation should not assume that every client relationship can be sold like a subscription contract.

Client transferability affects forecast attrition, risk rates, earnout structures, working capital assumptions, and the weighting of valuation methods. If the seller will stay for a transition period and introduce clients to successor lawyers, the probability of retention may improve. If the seller is leaving immediately, client retention risk may increase. If the firm has institutional clients served by several attorneys, client transferability may be stronger than in a solo practice where clients hired one named attorney for personal reasons.

Nonlawyer Ownership and Fee-Sharing Restrictions Can Narrow the Buyer Universe

ABA Model Rule 5.4 addresses professional independence and includes model-rule restrictions relevant to fee sharing and nonlawyer ownership, subject to state variation and jurisdiction-specific developments (American Bar Association, n.d.-b). The valuation issue is practical: restrictions on who may own, control, or share fees in a law firm can narrow the buyer universe and limit deal structures. A narrower buyer universe can affect marketability, transaction terms, financing, and the evidence available for a market approach.

A valuation should avoid legal conclusions about what is allowed in a particular state unless the analyst is qualified and engaged to provide that advice. Instead, the valuation report can identify the issue as a risk factor or assumption and recommend review by legal or ethics counsel. Where nonlawyer ownership, outside investment, management-service structures, or referral arrangements are relevant, the valuation should not simply copy valuation logic from an unregulated service business.

Confidentiality Affects Due Diligence

Due diligence in a law-firm transaction is sensitive. ABA Model Rule 1.6 provides model-rule context for confidentiality of information, again subject to state variation (American Bar Association, n.d.-c). A buyer may want client lists, matter descriptions, fee history, case documents, settlement information, conflicts data, and referral details. The seller may be constrained in what can be disclosed and when.

From a valuation perspective, confidentiality can limit the information available to the analyst or buyer. Practical solutions may include redacted data, aggregated client concentration reports, staged diligence, data rooms with access controls, outside counsel review, client consents where required, and carefully drafted nondisclosure agreements. If the analyst cannot review enough detail to assess collectability, concentration, or case risk, the report should disclose the limitation and consider whether additional uncertainty should be reflected in scenarios or risk adjustments.

The Data Checklist for a Law Firm Business Appraisal

A law firm business appraisal depends on data quality. Clean, accrual-based financial statements, detailed billing records, A/R aging, WIP reports, compensation schedules, client concentration data, and matter pipelines provide a stronger basis for analysis than cash-basis tax returns alone. The following checklist is a practical starting point.

Data category	Documents and metrics	Why it matters	Quality flags
Financial statements	P&Ls, balance sheets, tax returns, trial balances, general ledgers	Establish historical revenue, expenses, assets, and liabilities	Cash-basis distortions, inconsistent coding, missing balance sheets
Billing and collections	Realization, collection rates, WIP reports, A/R aging, write-offs	Converts billed work into cash flow	Old receivables, large write-downs, unbilled time, weak collection discipline
Practice areas	Revenue, margin, attorney time, and matter counts by segment	Identifies risk and growth drivers	One volatile practice dominates earnings
Clients and referral sources	Top clients, referral channels, retention trends, client tenure	Measures concentration and transferability	One partner controls key relationships
People	Attorney and staff roster, compensation, utilization, origination credit	Supports capacity and replacement compensation analysis	Underpaid owners, retention issues, undocumented bonuses
Cases and matters	Pipeline, contingency inventory, case costs, expected timing	Important for DCF and working capital	Speculative recoveries, one case dominates value
Legal and governance documents	Partnership agreements, employment agreements, leases, insurance, engagement terms	Shapes transfer rights, buyouts, obligations, and risk	Missing buy-sell provisions, unresolved disputes
Working capital and liabilities	Debt, payroll accruals, retainers, deferred revenue, deposits, malpractice tail	Converts enterprise value to equity value	Hidden obligations, trust funds mixed with operating cash

The analyst should reconcile accounting data to operational data. If the P&L reports $5 million of revenue but billing reports show large write-offs or uncollected invoices, reported revenue may overstate economic benefit. If partners take low salaries and large distributions, reported profit may overstate value unless replacement compensation is deducted. If marketing has been underfunded for years, historical profit may not be sustainable. If a firm has deferred technology, cybersecurity, or staffing investment, normalized earnings may need to include recurring reinvestment.

Normalize Financial Statements Before Applying Valuation Methods

Normalization is the bridge between accounting results and economic earnings. Law firms often report financial results in ways that are useful for tax preparation or internal partner accounting but not directly usable for business valuation. The analyst must adjust the statements to reflect the economic reality of the subject interest.

Convert Reported Profit Into Economic Earnings

Common normalization adjustments include owner compensation, discretionary expenses, nonrecurring expenses, unusual revenue, related-party transactions, cash-to-accrual adjustments, technology underinvestment, marketing underinvestment, and compensation accruals. The analyst should document each adjustment and explain why it is reasonable.

Owner compensation is often the largest adjustment. A partner’s draw may include payment for legal work, business development, management, risk, capital ownership, and profit distribution. For valuation, those functions should be separated. If an owner-lawyer works full time in the practice, the business must pay a market-level replacement cost for that labor before calculating return on ownership. If the firm relies on the owner for management and rainmaking, the analyst may also consider replacement management or business development costs.

Nonrecurring items may include relocation expenses, one-time recruiting fees, unusual litigation costs, extraordinary bad debt, pandemic-era disruptions, technology implementation costs, or a one-time settlement unrelated to ordinary operations. The analyst should be cautious. Not every unpleasant expense is nonrecurring. If a law firm repeatedly has malpractice defense costs, partner disputes, or recruiting expenses, those costs may be part of normal risk.

EBITDA Can Help, But It Is Not the Whole Answer

EBITDA means earnings before interest, taxes, depreciation, and amortization. It can help compare operating performance before financing structure, tax structure, and certain noncash charges. In a law firm valuation, EBITDA may be a useful intermediate metric, especially for multi-attorney firms with meaningful operating infrastructure. However, EBITDA is not automatically the same as cash flow or value.

For law firms, EBITDA can be misleading if owner compensation is not normalized. A firm may show high EBITDA because partners are underpaid through salary and compensated through distributions. Another firm may show low EBITDA because it pays partners full market salaries. EBITDA also ignores working capital needs, case-cost financing, taxes, debt service, capital expenditures, and the economics of WIP and receivables. A contingency-fee firm may have limited current EBITDA while building a valuable case inventory, or it may show a large profit after one case while future pipeline risk remains high.

The best practice is to use EBITDA as one tool, not a shortcut. A professional business valuation should connect EBITDA to normalized cash flow, risk, and the selected valuation methods.

Work-in-Process, Accounts Receivable, and Retainers

WIP and accounts receivable deserve special attention. WIP is work performed but not yet billed. Accounts receivable are billed amounts not yet collected. Both can represent value, but neither should be accepted at face value without reviewing collectability, aging, write-downs, fee disputes, client credit quality, and historical realization.

Old receivables may require discounts or reserves. Unbilled time may be written down before billing. Contingency matters may not become fees at all unless a successful outcome occurs. Advanced case costs may be reimbursable, partially recoverable, or risky depending on the engagement terms and case outcome. A valuation should identify whether WIP and A/R are included in the subject interest, retained by the seller, purchased separately, or treated as working capital.

Client retainers and trust funds require careful treatment. Funds held in a client trust account are not automatically assets of the firm. Unearned retainers may represent obligations to perform work or return funds, depending on the arrangement and applicable rules. A valuation should not inflate firm value by counting client money as operating cash.

Owner Compensation and Replacement Management

A law firm owner often wears several hats: practicing lawyer, supervising attorney, business developer, manager, recruiter, mentor, public face of the firm, and capital provider. Each function has economic significance. A buyer or incoming partner must know which functions will continue, which must be replaced, and which are tied to personal goodwill.

Compensation benchmarks can help, but they must be used carefully. Salary guides and market compensation resources may provide context, but actual replacement compensation depends on practice area, geography, seniority, book of business, workload, benefits, and management responsibilities. Robert Half’s legal salary guide is an example of a compensation resource that may be useful for context, but valuation reports should avoid unsupported salary assumptions and should document the basis for any compensation adjustment (Robert Half, n.d.).

Hypothetical Normalized EBITDA and Cash-Flow Bridge

The following example is hypothetical and simplified. It is not a valuation conclusion, not a pricing multiple, and not a recommendation for any specific firm.

Reported owner discretionary income                         $900,000
Add back: one-time office relocation expense                  75,000
Add back: nonrecurring recruiting search fee                  40,000
Subtract: market compensation for owner legal work          (350,000)
Subtract: replacement management/business development cost   (125,000)
Subtract: recurring technology and cybersecurity spend        (45,000)
Adjust: expected WIP/A/R realization difference              (60,000)
Indicated normalized EBITDA / cash-flow proxy                $435,000

This bridge illustrates the concept. The analyst begins with reported discretionary income, removes nonrecurring distortions, subtracts market compensation for labor and management that a buyer must replace, adjusts for recurring investment, and considers WIP and A/R realization. Depending on the assignment, the final cash-flow measure may require additional adjustments for taxes, working capital, debt, capital expenditures, and entity-specific assumptions.

Valuation Approach Comparison Matrix

Approach	Best use cases	Key inputs	Law-firm-specific adjustments	Main risks
Income approach	Profitable firms with supportable future earnings or cash flow	Normalized cash flow, forecast, risk, growth, terminal value	Owner compensation, client retention, partner transition, WIP/A/R, case pipeline	Unsupported forecasts, personal goodwill, concentration
Market approach	Reliable comparable transactions are available	Transaction data, financial metrics, deal terms, comparability filters	Practice area, geography, fee model, buyer restrictions, included assets	Weak comparability, hidden earnouts, missing working capital details
Asset approach	Distressed, dissolving, asset-heavy, or low-transferability practices	Adjusted assets and liabilities	A/R collectability, WIP, case costs, trust-fund exclusion, malpractice tail	Overlooking liabilities, overvaluing speculative WIP

A well-supported valuation may use more than one approach. It may rely primarily on the income approach, use the market approach as a reasonableness check, and use the asset approach to test downside value or reconcile working capital. The analyst should explain why each method was used, modified, or rejected.

The Income Approach for Law Firms

The income approach values a business based on the economic benefit expected from future earnings or cash flow. For many profitable law firms, it is the central approach because value is primarily generated by professional services rather than hard assets. The income approach can be applied through capitalization of normalized cash flow or through discounted cash flow analysis.

Capitalization of Normalized Cash Flow

Capitalization of normalized cash flow is commonly used when a mature law firm has stable operations, supportable recurring earnings, and no major expected change in risk or growth. The method converts a representative cash-flow measure into value using a capitalization rate that reflects risk and expected long-term growth.

The key challenge is selecting a representative cash-flow base. Historical results may need to be weighted or adjusted. If the firm recently lost a major client, historical earnings may overstate future benefit. If the firm recently hired a strong team and signed recurring clients, historical earnings may understate future benefit. If partner compensation has been inconsistent, normalized cash flow must be carefully developed.

The capitalization rate should not be guessed. It should reflect the subject firm’s risk profile, the standard of value, expected growth, market evidence where available, and the nature of the cash flow being capitalized. This article does not provide generic law-firm capitalization rates because unsupported rates can create false precision.

Discounted Cash Flow for Changing Firms

A discounted cash flow model is often more appropriate when cash flows are expected to change materially. Examples include a founder retirement, partner split, new office, shift from hourly to subscription pricing, major case pipeline, acquisition, planned associate hiring, new marketing engine, anticipated loss of a major client, or margin improvement plan.

A discounted cash flow model forecasts cash flows over discrete periods and discounts them to present value. It may also include a terminal value representing value beyond the explicit forecast period. For law firms, the forecast should consider revenue by practice area, realization, collections, staffing, compensation, marketing, technology, occupancy, case costs, taxes, working capital, and transition risk.

The forecast should not be a wish list. It should be tied to historical performance, signed engagements, pipeline evidence, client retention patterns, staffing capacity, and documented plans. Sensitivity testing is often valuable. For example, the valuation may test outcomes if a retiring partner retains fewer clients than expected, if A/R collection is slower than planned, or if contingency cases resolve later than management forecasts.

Contingency-Fee Practice Considerations

Plaintiff contingency-fee firms require special care because revenue timing and amounts may be uncertain. A firm may carry significant case costs for years before a recovery. A large verdict, settlement, or dismissal can distort a single year’s financial statements. A simple capitalization of last year’s profit may be unreliable.

A discounted cash flow or probability-weighted case analysis may be useful. The analyst may evaluate case inventory, expected resolution timing, case costs, historical outcomes, concentration, financing arrangements, attorney capacity, and downside scenarios. However, the analyst should avoid unsupported probabilities. Inputs should come from management, counsel, historical firm data, case documents where appropriately available, and reasoned scenario analysis.

The valuation should also distinguish between existing case inventory and future case generation. Existing cases may be analyzed as a discrete asset or cash-flow stream. Future cases depend on marketing, referrals, attorneys, reputation, and capital. A firm with one large pending case is different from a firm with a repeatable intake process and diversified inventory.

Risk Factors That Affect the Income Approach

Risk factors affect forecasts, discount rates, capitalization rates, method weighting, and deal terms. For law firms, important risks include client concentration, referral concentration, partner dependence, practice-area cyclicality, associate retention, compensation pressure, malpractice history, conflicts, cybersecurity, billing discipline, case-cost financing, lease commitments, technology gaps, and the strength of documented systems.

Risk level	Indicators	Valuation implication
Lower	Diverse clients, multiple responsible attorneys, documented transition plan, recurring work, strong collections	Lower forecast attrition or lower transferability adjustment may be supportable
Moderate	Several key clients tied to two or three partners, mixed documentation, uneven realization	Sensitivity testing and transition terms may receive significant attention
Higher	One rainmaker, one referral source, one case, or one client dominates economics	DCF scenarios, earnouts, holdbacks, or asset approach may receive more weight

The risk analysis should be explicit. It is not enough to say a firm is “good” or “risky.” A valuation should connect the risk to evidence: client concentration reports, partner origination data, collection history, signed agreements, case inventory, staff turnover, marketing metrics, and transition plans.

The Market Approach for Law Firms

The market approach estimates value by reference to transactions or pricing evidence for comparable businesses or interests. In theory, it is attractive because it uses market evidence. In practice, law-firm comparability is challenging.

What Market Data Can and Cannot Tell You

Comparable transaction data may be limited, confidential, incomplete, or not truly comparable. A reported transaction may include earnouts, seller financing, retained receivables, excluded liabilities, partner employment agreements, noncompete provisions, office leases, or working capital adjustments. Without those details, a headline price can be misleading.

The market approach can still help. It may provide a reasonableness check, identify deal structures, or support a range when the data are reliable. But the analyst should evaluate comparability filters such as practice area, geography, size, profitability, growth, fee model, client transferability, attorney bench, owner involvement, concentration, buyer universe, deal terms, included assets, and post-closing services.

Why Rules of Thumb Can Be Dangerous

Law-firm owners sometimes hear rules of thumb based on revenue. These shortcuts can be dangerous. Gross revenue ignores profitability, partner compensation, collections, WIP quality, client retention, buyer restrictions, debt, working capital, case costs, and transferability. Two firms with the same revenue can have very different values.

Consider two hypothetical firms. Firm A has recurring business clients, strong collections, multiple attorneys serving each major client, documented systems, and normalized cash flow after market compensation. Firm B has the same revenue but depends on a retiring founder, has old receivables, weak staff retention, and no documented transition plan. A revenue-only rule would treat them similarly, even though the risk and transferable cash flow are different.

For that reason, this article does not provide generic law-firm transaction multiple ranges. If market data are used, the valuation should explain why the data are comparable, what adjustments were made, and how market evidence was reconciled with income and asset indications.

Comparability Filters

A practical market approach should consider at least the following filters:

1. Practice area mix, such as estate planning, family law, plaintiff litigation, defense litigation, corporate, intellectual property, immigration, employment, real estate, or criminal defense.
2. Geography and local market conditions.
3. Firm size, attorney leverage, and staff structure.
4. Revenue model, including hourly, fixed fee, subscription, contingency, hybrid, or retainers.
5. Normalized margins after market compensation.
6. Client concentration and client transferability.
7. Referral source concentration.
8. WIP, A/R, and working capital treatment.
9. Seller transition obligations.
10. Earnouts, holdbacks, seller notes, and contingent payments.
11. Included and excluded assets.
12. Ethics and ownership restrictions affecting the buyer universe.

If these details are missing, market data may receive limited weight.

The Asset Approach for Law Firms

The asset approach estimates value by adjusting assets and liabilities to an appropriate value basis. For many profitable firms with transferable earnings, the asset approach may serve as a floor or reasonableness check. For some law firms, it may be the most important approach.

When the Asset Approach Receives More Weight

The asset approach may receive more weight when the firm is distressed, dissolving, not profitable after owner compensation, highly dependent on one departing lawyer, unable to transfer clients, or primarily valuable because of receivables, WIP, case costs, cash, deposits, equipment, and files. It may also be important when the valuation purpose requires a balance-sheet focus.

For a solo practice with limited transferable goodwill, the value may be closer to adjusted net assets plus any separately supportable transition value. For a dissolving firm, value may depend on A/R collections, WIP billing, return of deposits, payment of liabilities, and liquidation of equipment. For an asset-heavy firm with substantial advanced case costs, the analyst must evaluate recoverability and timing.

Assets to Analyze

Assets may include operating cash, normalized working capital, accounts receivable, WIP, reimbursable case costs, prepaid expenses, deposits, furniture, equipment, technology assets, phone numbers, domain names, websites, marketing materials, trade names where transferable, and records needed for continuity. The analyst should understand whether these assets are owned by the firm, leased, licensed, restricted, or tied to individual lawyers.

Accounts receivable should be aged and risk-adjusted. WIP should be reviewed for billing likelihood. Advanced costs should be assessed for recoverability. Equipment should not be assumed to equal book value. Software subscriptions may not be transferable. Website domains and phone numbers may have practical value even if accounting records show no asset.

Liabilities and Exclusions

Liabilities may include bank debt, partner loans, unpaid payroll, bonuses, taxes, lease obligations, vendor payables, deferred revenue, client retainer obligations, malpractice tail insurance, settlement obligations, and partner capital claims. The analyst should also identify assets that are excluded from firm value, especially client trust funds. Client trust money is not operating cash of the firm simply because it appears on a bank statement.

The conversion from enterprise value to equity value should be documented. If the income approach produces a debt-free value but the firm has bank debt and excess cash, those adjustments must be made consistently. If A/R is excluded from a sale price and retained by the seller, the valuation should not include it without explanation.

Enterprise Goodwill vs. Personal Goodwill in a Law Firm

Goodwill is often the most contested issue in law-firm valuation. The distinction between enterprise goodwill and personal goodwill affects transferability, risk, deal terms, tax allocation, divorce disputes, partner buyouts, and value conclusions.

Enterprise Goodwill

Enterprise goodwill is value associated with the firm as an institution. It may arise from brand, location, phone numbers, website authority, marketing systems, trained workforce, documented processes, recurring clients, institutional referral relationships, technology, knowledge management, and the ability of multiple professionals to serve clients. Enterprise goodwill is more likely to transfer because it is not solely tied to one person.

A firm with strong enterprise goodwill may have client relationships held by teams rather than individuals. It may use documented intake scripts, CRM workflows, standardized matter management, shared client histories, and succession plans. It may have a recognizable brand independent of the founder’s name. These features can support stronger income-approach assumptions and reduce transition risk.

Personal Goodwill

Personal goodwill is value tied to an individual lawyer’s reputation, relationships, skill, charisma, referral network, or rainmaking ability. It may be valuable to that lawyer but difficult for the firm or buyer to own without the lawyer’s continued involvement. If clients hired the lawyer personally and are unlikely to stay with a successor, personal goodwill may not be fully transferable.

Personal goodwill is not all-or-nothing. A founder may have personal relationships, but a transition plan, staff continuity, client introductions, and strong successor attorneys may transfer some benefit. Conversely, a firm with a brand may still have key-person risk if one partner controls major clients. The analyst should evaluate evidence rather than labels.

Why the Distinction Matters

The distinction matters because valuation is about economic benefit to the subject interest. If goodwill cannot transfer, a buyer may not pay full value for it. In a partner buyout, the agreement may specify how goodwill is treated. In divorce, tax, or litigation contexts, legal rules and case law may matter, and qualified counsel should be involved. This article does not rely on case citations or provide legal conclusions about personal goodwill in any jurisdiction.

Deal terms can convert some personal goodwill into transferable value. Seller employment agreements, consulting periods, client introductions, referral arrangements allowed by applicable rules, and earnouts tied to collections may help bridge risk. However, those terms must be legally and ethically reviewed.

Tax Allocation Context Without Tax Advice

Goodwill and intangible assets may have tax significance in certain transactions. Internal Revenue Code Section 197 addresses amortization of goodwill and certain other intangibles in qualifying circumstances, and Treasury regulations provide additional context (26 U.S.C. § 197, n.d.; 26 C.F.R. § 1.197-2, n.d.). Internal Revenue Code Section 1060 and related regulations address allocation rules for certain applicable asset acquisitions, and IRS Form 8594 is used in certain asset acquisition reporting contexts (26 U.S.C. § 1060, n.d.; 26 C.F.R. § 1.1060-1, n.d.; Internal Revenue Service, n.d.).

These sources are cited only for general tax-allocation context. They do not provide a law-firm valuation formula, and this article does not provide tax advice. Buyers and sellers should coordinate valuation analysis, purchase agreement drafting, and tax reporting with qualified CPAs and legal advisers.

How Deal Structure Affects Value

Value and price are related, but they are not identical. A valuation conclusion may assume a particular basis, while an actual transaction may allocate risk through deal structure. In law-firm transactions, deal structure can be especially important because client retention, collections, and seller transition may be uncertain.

Cash at Closing vs. Earnouts or Retention Payments

A buyer may be reluctant to pay all consideration at closing if future revenue depends on client retention after the seller leaves. An earnout, holdback, seller note, or retention-based payment may transfer some risk back to the seller. From the seller’s perspective, contingent consideration may produce a higher headline price but lower certainty.

A valuation should distinguish between the value of the business and the expected value of payment terms. A nominal earnout is not the same as cash at closing. The probability of achieving the earnout, timing of payment, credit risk, and measurement disputes all matter.

Treatment of WIP and A/R

WIP and A/R can be handled in several ways. They may be included in the purchase price, retained by the seller, purchased at a discount, collected by the buyer for a fee, or split according to an agreement. Each structure affects value. If receivables are retained by the seller, the buyer may pay less for the ongoing business. If receivables are included, the buyer must evaluate collectability.

The agreement should define cut-off dates, billing responsibility, write-offs, client disputes, collection costs, and whether old receivables are subject to collection support, reserves, repurchase obligations, or other risk-sharing terms. For contingency matters, the parties may need to allocate fees and costs between pre-closing and post-closing work, subject to applicable law and engagement terms.

Seller Transition and Client Notices

A seller’s transition role can have significant economic value. Introductions, joint client meetings, referral-source handoffs, staff retention support, and temporary consulting may reduce attrition. In some cases, applicable professional rules may require notices or consents. ABA Model Rule 1.17 provides model-rule context for sales of law practices, but state rules vary and must be checked (American Bar Association, n.d.-a).

Valuation assumptions should match the expected transition. A valuation that assumes a two-year seller transition should not be used for a transaction where the seller exits immediately unless the difference is analyzed.

Working Capital and Debt-Free/Cash-Free Assumptions

Many valuations and transactions specify a working capital target or a debt-free/cash-free basis. Law firms may have unusual working capital because of retainers, trust funds, WIP, A/R, case costs, partner capital, and tax distributions. The valuation should define normal working capital and identify excess or deficient amounts.

Debt and cash adjustments should be consistent. Operating cash needed for payroll and rent is different from excess cash. Client trust funds should not be treated as excess cash of the firm. Debt used to finance case costs may require separate analysis depending on whether the related cases and recoveries are included.

Deal and Transition Checklist

• Confirm applicable state ethics rules and required client notices or consents with qualified counsel.
• Define the subject assets and excluded assets.
• Specify treatment of A/R, WIP, case costs, retainers, trust funds, and deferred revenue.
• Document seller transition duties, duration, compensation, and performance expectations.
• Identify client and referral retention assumptions.
• Address attorney and staff retention plans.
• Define malpractice tail insurance responsibility.
• Coordinate tax allocation and Form 8594 responsibilities where relevant.
• Protect confidentiality during diligence through appropriate controls.
• Reconcile purchase price, payment terms, and valuation assumptions.

Step-by-Step Law Firm Valuation Process

A disciplined process helps prevent unsupported conclusions. The following steps are practical, but they should be adapted to the purpose, scope, and standard of value.

Step 1: Clarify Purpose, Standard, Subject Interest, and Valuation Date

The first step is assignment definition. Identify why the valuation is needed, who will use it, what interest is being valued, what standard of value applies, what premise of value applies, and what date controls the analysis. Confirm whether the engagement requires a calculation, conclusion, full narrative report, limited report, litigation support, or another format. Professional standards can help frame these decisions (AICPA-CIMA, n.d.; NACVA, n.d.).

Step 2: Gather Financial, Operational, Client, and Legal Documents

Collect financial statements, tax returns, billing reports, A/R aging, WIP reports, compensation data, client concentration, referral data, practice-area profitability, partner agreements, leases, insurance, debt documents, employment agreements, and relevant transaction documents. Use redaction or aggregated reporting where confidentiality requires it.

Step 3: Normalize Earnings and Cash Flow

Adjust reported results for owner compensation, nonrecurring items, discretionary expenses, related-party arrangements, cash-to-accrual differences, deferred investment, and WIP/A/R realization. Develop a cash-flow measure appropriate for the method. Document each adjustment.

Step 4: Analyze Law-Firm-Specific Risk and Transferability

Evaluate client retention, referral dependence, partner dependence, attorney bench strength, staff stability, brand, practice-area risk, collection discipline, case pipeline, ethics constraints, confidentiality limits, and transition plan. Separate enterprise goodwill from personal goodwill where relevant.

Step 5: Apply Income, Market, and Asset Approaches as Appropriate

Select methods that fit the facts. Use capitalized cash flow for stable, mature firms when supportable. Use discounted cash flow for changing firms or contingency-fee practices. Use the market approach only with reliable comparable data. Use the asset approach for distressed, dissolving, asset-heavy, or low-transferability practices.

Step 6: Reconcile Indications of Value

Reconciliation is not simple averaging. The analyst should weigh methods based on reliability, relevance, data quality, and consistency with the valuation purpose. If the income approach is strong and market data are weak, income may receive more weight. If the firm has little transferable cash flow, the asset approach may dominate.

Step 7: Document Assumptions, Limitations, and Sensitivity Cases

A valuation report should explain assumptions and limitations clearly. If client-level data were unavailable, say so. If a forecast assumes seller transition, state it. If A/R was discounted based on aging, document the logic. If state ethics rules were outside the scope, recommend counsel review.

Practical Mini Case Studies

The following case studies are hypothetical. They are designed to show valuation thinking, not to state law-firm multiples, discount rates, capitalization rates, or final values.

Case Study 1: Retiring Solo Estate-Planning Attorney

A solo estate-planning attorney has practiced for 30 years. The firm has steady revenue, a respected local reputation, one paralegal, old software, and many referrals from financial advisers. The attorney wants to retire within six months. Most clients know the attorney personally, but the practice has organized files and recurring estate-update work.

The valuation begins by normalizing earnings after deducting market compensation for legal work and administrative management. The analyst reviews A/R, WIP, referral sources, client age, file quality, website traffic, and transition plan. Because the founder is central, personal goodwill risk is significant. The asset approach may receive meaningful weight, especially for A/R, WIP, files, phone number, website, and equipment. An income approach may be supportable only if a seller transition plan and client handoff create credible future cash flow.

A buyer may structure the transaction with a modest closing payment plus payments tied to collections from transitioned clients. The valuation should not assume all historical revenue continues unless evidence supports it.

Case Study 2: Three-Partner Business Litigation Firm

A three-partner business litigation firm has strong revenue but uneven profitability. Two partners originate most work. Associates perform much of the billable work. The firm has several large clients, a history of write-downs, and a pipeline of significant matters. One partner is considering retirement.

The analyst normalizes partner compensation, evaluates realization and collection rates, reviews partner origination, and tests client concentration. Because litigation revenue can be volatile, a discounted cash flow analysis may be more informative than a single-year capitalization method. Scenarios may consider whether the retiring partner remains for transition, whether key clients stay, and whether associate leverage remains stable.

The market approach may be difficult unless comparable transactions with similar litigation mix, partner structure, and deal terms are available. The asset approach can help analyze receivables and WIP but may not capture transferable earnings if the firm has durable institutional relationships.

Case Study 3: Plaintiff Contingency-Fee Practice

A plaintiff firm has several pending cases, substantial advanced costs, and irregular historical earnings. One large case may resolve within two years, but timing and outcome are uncertain. The firm also has a repeatable intake process and experienced trial lawyers.

A simple EBITDA multiple would be unreliable. The analyst may build a probability-weighted discounted cash flow model for existing cases and a separate forecast for future case generation. Case costs, financing costs, attorney capacity, referral channels, and historical outcomes should be reviewed. One large case should be stress-tested so the valuation does not depend on a single optimistic result.

The asset approach may include recoverable case costs, but speculative legal claims should not be valued as certain receivables. The report should clearly disclose assumptions and may present scenarios rather than one unsupported deterministic forecast.

Case Study 4: Recurring Outside General Counsel Boutique

A boutique firm provides recurring outside general counsel services to privately held companies. It has subscription-like monthly arrangements, documented workflows, multiple attorneys serving clients, strong collections, and a recognized brand in a niche industry. The founder still originates work, but client service is team-based.

This firm may support an income approach with normalized cash flow because revenue appears more recurring and transferable than in many founder-dependent practices. The analyst still evaluates client concentration, renewal history, pricing, attorney retention, and whether clients would stay after a change in ownership. A market approach may provide a check if comparable recurring professional-services transactions are available, but law-firm-specific restrictions and deal terms must be considered.

The valuation may conclude that enterprise goodwill is meaningful if the brand, systems, team, and client relationships are institutional rather than purely personal.

Common Mistakes When Valuing a Law Firm

The first common mistake is applying a generic revenue multiple without analyzing profitability. Revenue is not cash flow. A firm with high revenue and low collections may be worth less than a smaller firm with disciplined billing and strong margins.

The second mistake is ignoring owner compensation. If a founder works full time and takes only distributions, reported profit may overstate economic earnings. A buyer must pay someone to perform that work.

The third mistake is treating all goodwill as transferable. Personal goodwill tied to one lawyer may not transfer without a transition plan, and sometimes not even then. Enterprise goodwill should be supported by evidence such as institutional clients, systems, staff, brand, and documented processes.

The fourth mistake is counting client trust funds as firm assets. Client money is not operating cash of the firm. Retainers and deferred revenue should be analyzed carefully.

The fifth mistake is overvaluing old A/R or speculative WIP. Aging, write-offs, fee disputes, client credit quality, and billing likelihood matter.

The sixth mistake is ignoring ethics rules and state-law constraints. Model rules provide context, but jurisdiction-specific rules should be checked. These issues can affect sale procedures, confidentiality, buyer eligibility, fee sharing, and transition.

The seventh mistake is failing to adjust for underinvestment. A firm that has deferred marketing, technology, cybersecurity, staff, or training may show inflated current earnings at the expense of future performance.

The eighth mistake is overlooking liabilities. Debt, lease obligations, accrued bonuses, taxes, malpractice tail insurance, deferred revenue, and partner capital accounts can affect equity value.

The ninth mistake is using market data without comparability review. Transaction data may include earnouts, retained A/R, seller employment, or special buyer synergies. Without deal terms, the data can mislead.

The tenth mistake is confusing valuation with negotiation. A valuation is an analytical opinion under defined assumptions. Negotiated price may differ because of financing, urgency, synergies, risk allocation, emotions, or leverage.

When to Obtain a Professional Business Appraisal

A professional business appraisal is useful when the value conclusion must be explained, documented, and defended. Law-firm owners and advisers should consider a professional valuation for sale planning, merger discussions, partner buy-ins, partner retirements, death or disability provisions, divorce, estate or gift planning, financing, litigation, succession planning, and internal strategy.

A valuation can also help before a dispute arises. Partnership agreements often contain valuation language that seems clear until a triggering event occurs. A periodic valuation review can identify ambiguous terms, outdated formulas, missing definitions, and unrealistic buyout funding mechanisms. For example, an agreement may refer to book value, fair market value, gross revenue, or a formula without defining treatment of WIP, A/R, debt, goodwill, or owner compensation.

Professional valuation support can help owners understand the drivers they can improve before a sale or succession. A firm that wants higher value should not focus only on revenue. It should build transferable systems, diversify clients, document processes, strengthen collections, develop successor attorneys, reduce dependence on one rainmaker, maintain clean financials, and plan transition early.

If you need a defensible business appraisal for a law firm, Simply Business Valuation can help organize the analysis, normalize earnings, evaluate risk, reconcile valuation methods, and communicate the conclusion clearly for the intended purpose.

FAQ: Law Firm Valuation

1. What is the best method to value a law firm?

There is no single best method for every law firm. A stable firm with transferable cash flow may be valued primarily with an income approach. A changing firm may require a discounted cash flow analysis. A distressed or highly owner-dependent practice may require significant weight on the asset approach. The market approach can help when reliable comparable data exist. A professional valuation should select methods based on the purpose, subject interest, data quality, and firm-specific facts.

2. Can a law firm be valued using EBITDA?

Yes, EBITDA can be used as an analytical metric, but it should not be used blindly. EBITDA must usually be normalized for owner compensation, nonrecurring items, working capital, WIP and A/R realization, and recurring investment needs. EBITDA is not the same as cash flow, and it does not automatically solve transferability or personal goodwill issues.

3. How is a solo law practice valued?

A solo law practice is valued by analyzing transferable cash flow, personal goodwill, A/R, WIP, client retention, referral sources, staff, systems, and transition support. If the practice depends heavily on the owner and clients are unlikely to transfer, the asset approach may receive more weight. If the seller will provide a strong transition and the practice has recurring clients or systems, an income approach may also be supportable.

4. How do you value a contingency-fee law firm?

A contingency-fee law firm may require a discounted cash flow or probability-weighted analysis of case inventory, expected timing, case costs, financing costs, historical outcomes, and future intake. A single year of profit may be misleading because recoveries can be irregular. The valuation should stress-test large cases and avoid treating speculative outcomes as certain receivables.

5. Are law firms valued on revenue multiples?

Revenue multiples are sometimes discussed in the marketplace, but they can be dangerous without detailed comparability analysis. Revenue ignores profitability, owner compensation, collections, WIP, client retention, deal terms, and risk. A defensible valuation should focus on normalized cash flow, transferable goodwill, net assets, and reliable market evidence rather than unsupported rules of thumb.

6. What is the difference between enterprise goodwill and personal goodwill?

Enterprise goodwill belongs to the firm as an institution and may be tied to brand, systems, workforce, recurring clients, documented processes, and diversified referral sources. Personal goodwill is tied to an individual lawyer’s reputation, relationships, and rainmaking ability. The distinction matters because enterprise goodwill is generally more transferable than personal goodwill.

7. Should WIP and accounts receivable be included in value?

It depends on the valuation assignment and transaction terms. WIP and A/R may be included, excluded, retained by the seller, purchased separately, or adjusted through working capital. The analyst should review aging, collectability, write-offs, fee disputes, billing likelihood, and whether amounts are already reflected in the income approach.

8. Are client trust account funds included in law firm value?

Client trust account funds should not be treated as operating assets of the firm merely because the firm controls the account administratively. They are client funds subject to applicable professional rules. Retainers and deferred revenue should be analyzed carefully with legal and accounting advice where needed.

9. How do partner compensation and distributions affect valuation?

Partner compensation affects normalized earnings. Distributions may include payment for labor, management, origination, capital ownership, and profit. A valuation should deduct market compensation for services required to operate the firm before estimating return on ownership. Otherwise, value may be overstated.

10. How do ethics rules affect the sale of a law practice?

Ethics rules can affect client notices, confidentiality, conflicts, fee arrangements, nonlawyer ownership, and sale procedures. ABA Model Rules provide model-rule context, but state rules vary. Parties should consult qualified counsel or ethics advisers for jurisdiction-specific requirements. From a valuation perspective, these rules can affect transferability, buyer universe, diligence, and deal structure.

11. What documents are needed for a law firm business appraisal?

Common documents include financial statements, tax returns, general ledgers, billing reports, A/R aging, WIP reports, compensation schedules, client concentration reports, practice-area revenue, partner agreements, leases, debt documents, insurance information, employment agreements, and case pipeline data. Confidential information may need to be redacted or summarized.

12. How does the market approach apply to law firms?

The market approach compares the subject firm to transactions or market data for similar firms. It is useful only when the data are reliable and comparable. Practice area, geography, profitability, client transferability, fee model, deal terms, and included assets must be considered. Weak or incomplete market data should receive limited weight.

13. When is the asset approach most important?

The asset approach is most important when a firm is distressed, dissolving, not profitable after owner compensation, highly dependent on a departing lawyer, or primarily valuable because of A/R, WIP, case costs, cash, deposits, and equipment. It can also serve as a reasonableness check for profitable firms.

14. How long does a law firm valuation take?

Timing depends on data quality, firm complexity, confidentiality procedures, purpose, report scope, and responsiveness of management. A clean, small firm with organized records may be faster than a multi-partner firm with multiple practice areas, contingency cases, disputes, or missing records. The analyst should define the scope and information request early.

Conclusion

A law firm valuation should do more than apply a rule of thumb. It should identify the assignment, normalize earnings, analyze EBITDA and cash flow carefully, evaluate WIP and accounts receivable, separate enterprise goodwill from personal goodwill, consider ethics and transferability constraints, and reconcile the income approach, market approach, and asset approach based on the evidence.

The best valuations are practical and transparent. They explain what drives value, what creates risk, what assumptions matter, and how different methods support or challenge each other. For owners, partners, buyers, and advisers, that clarity can improve negotiations, succession planning, partner agreements, litigation preparation, financing discussions, and long-term strategy.

Simply Business Valuation provides professional business appraisal support for business owners and advisers who need a clear, defensible valuation process. If your law firm is preparing for a sale, partner transition, buy-sell event, internal planning project, or other valuation need, a structured business valuation can help you move forward with better information and fewer unsupported assumptions.

References

• 26 C.F.R. § 1.1060-1. (n.d.). Special allocation rules for certain asset acquisitions. Legal Information Institute. https://www.law.cornell.edu/cfr/text/26/1.1060-1

• 26 C.F.R. § 1.197-2. (n.d.). Amortization of goodwill and certain other intangibles. Legal Information Institute. https://www.law.cornell.edu/cfr/text/26/1.197-2

• 26 U.S.C. § 1060. (n.d.). Special allocation rules for certain asset acquisitions. Legal Information Institute. https://www.law.cornell.edu/uscode/text/26/1060

• 26 U.S.C. § 197. (n.d.). Amortization of goodwill and certain other intangibles. Legal Information Institute. https://www.law.cornell.edu/uscode/text/26/197

• AICPA-CIMA. (n.d.). Statement on Standards for Valuation Services, VS Section 100. https://www.aicpa-cima.com/resources/download/statement-on-standards-for-valuation-services-vs-section-100

• American Bar Association. (n.d.-a). Rule 1.17: Sale of law practice. https://www.americanbar.org/groups/professional_responsibility/publications/model_rules_of_professional_conduct/rule_1_17_sale_of_law_practice/

• American Bar Association. (n.d.-b). Rule 5.4: Professional independence of a lawyer. https://www.americanbar.org/groups/professional_responsibility/publications/model_rules_of_professional_conduct/rule_5_4_professional_independence_of_a_lawyer/

• American Bar Association. (n.d.-c). Rule 1.6: Confidentiality of information. https://www.americanbar.org/groups/professional_responsibility/publications/model_rules_of_professional_conduct/rule_1_6_confidentiality_of_information/

• Internal Revenue Service. (n.d.). About Form 8594, Asset Acquisition Statement Under Section 1060. https://www.irs.gov/forms-pubs/about-form-8594

• International Valuation Standards Council. (n.d.). International Valuation Standards. https://ivsc.org/standards/

• NACVA. (n.d.). Professional standards. https://www.nacva.com/standards

• Robert Half. (n.d.). Legal salary guide. https://www.roberthalf.com/us/en/insights/salary-guide/legal

• The Appraisal Foundation. (n.d.). USPAP. https://appraisalfoundation.org/products/uspap