Published: October 10, 2025

Common Mistakes to Avoid When Valuing a Business

By James Lynsard, Certified Business Appraiser

Business valuation is useful only when the conclusion is tied to the right purpose, the right standard of value, supportable financial information, and a clear record of the assumptions used. A valuation prepared for a possible sale, a buy-sell agreement, a gift or estate tax matter, a divorce, a Section 409A equity grant, a 401(k) or ROBS plan, or a financial-reporting exercise may require different dates, procedures, assumptions, and reviewers. Treating all of those assignments as interchangeable is one of the fastest ways to create a misleading result.

This article reviews common mistakes that business owners, buyers, advisers, and CPAs should watch for before relying on a valuation. It is educational only. A valuation report can support planning, negotiation, tax reporting, plan administration, or litigation work, but it does not replace legal, tax, accounting, or ERISA advice.

Key points

• The three generally accepted business valuation approaches are commonly described as the asset-based approach, the market approach, and the income approach. IRS business valuation guidance says all three should be considered, with professional judgment used to select the method or methods that best fit the assignment (Internal Revenue Service [IRS], 2020).
• A valuation conclusion can be distorted by unnormalized earnings, unsupported discount or capitalization rates, aggressive projections, missing liabilities, or failure to identify intangible assets and company-specific risks.
• Purpose matters. Fair market value, investment value, financial-reporting value, divorce value, and tax-related value are not always the same assignment.
• A professional valuation can improve the reliability and documentation of the conclusion, but no valuation provider should promise automatic acceptance by a tax agency, regulator, court, lender, buyer, or plan reviewer.

Why valuation mistakes matter

A business valuation is more than a spreadsheet output. It is a reasoned conclusion based on the subject interest, the valuation date, the standard of value, the premise of value, the available documents, the methods selected, and the assumptions used. The same company can produce different valuation indications depending on whether the assignment concerns a controlling interest, a minority interest, marketable shares, nonmarketable shares, a going concern, an asset sale, a tax filing, or a shareholder dispute.

For tax-related fair market value work, IRS Publication 561 describes fair market value as the price property would sell for on the open market between a willing buyer and a willing seller, with neither required to act and both having reasonable knowledge of the relevant facts (IRS, 2025). That definition is useful background, but each assignment still needs the applicable law, instructions, engagement terms, and facts.

Mistake 1: Using the wrong valuation method

The income, market, and asset-based approaches each answer a different kind of question. The income approach focuses on expected economic benefits. The market approach uses transactions or market data from comparable companies when reliable data exists. The asset-based approach focuses on the value of assets minus liabilities and may be more relevant for asset-heavy businesses, holding companies, or businesses whose earnings do not represent the real economic value of the underlying assets.

The mistake is not merely choosing one method. The mistake is choosing a method without explaining why it fits the business, the subject interest, and the intended use. A profitable professional-services firm with limited tangible assets may be understated if it is valued only by book assets. A real-estate holding company may be distorted if the valuation ignores property-level asset values. A startup or distressed company may require special care because historical earnings may not represent future earning capacity.

A safer approach is to consider all three broad approaches, document why some methods are used or rejected, and reconcile the indications rather than averaging numbers mechanically. IRS business valuation guidance expressly recognizes the asset-based, market, and income approaches and notes that professional judgment is needed in selecting the approach or approaches used (IRS, 2020).

Mistake 2: Not normalizing financial statements

Many small and closely held businesses report financial results that reflect owner preferences, tax planning, family compensation, one-time expenses, unusual revenue, discretionary spending, or related-party arrangements. Those items may be legitimate business or tax reporting items, but they can still distort a valuation if the goal is to estimate ongoing economic earnings.

Common normalization issues include owner compensation that is above or below market, personal expenses run through the company, nonrecurring legal or relocation costs, unusual pandemic-era revenue or expenses, related-party rent, one-time asset sales, and discretionary travel or vehicle costs. The point is not to inflate value. The point is to present the earnings stream a hypothetical buyer, investor, court, taxing authority, or plan fiduciary would reasonably analyze for the stated purpose.

A strong valuation file should identify each adjustment, explain the support for the amount, and avoid vague add-backs. Unsupported add-backs can be just as misleading as failing to normalize at all.

Mistake 3: Misapplying discount rates, capitalization rates, or multiples

Rates and multiples are not decorative assumptions. A discount rate, capitalization rate, or market multiple reflects risk, expected growth, market evidence, capital structure, industry conditions, and company-specific facts. A small change can materially affect value.

Common errors include using a public-company discount rate for a small private company without adjustment, applying a market multiple from a different industry, mixing pretax earnings with after-tax rates, using stale risk-free rate data, ignoring customer concentration, or applying a capitalization rate when a multi-period forecast is needed. IRS business valuation guidance notes that appraisers should select benefit streams and rates or multiples that are consistent with the selected methodology and relevant risk factors (IRS, 2020).

The safer practice is consistency. Match the rate to the cash flow being valued. Match the multiple to the metric being used. Explain the sources of market evidence. Then test the conclusion for reasonableness against the company’s actual risk profile.

Mistake 4: Using unsupported growth projections

Forecasts are often the most persuasive part of an income approach, and often the easiest part to overstate. A forecast should be tied to historical performance, capacity, customer pipeline, industry conditions, pricing, margins, working capital needs, capital expenditures, and management’s actual plan.

An aggressive forecast is not automatically wrong. A company may have signed contracts, new locations, new capacity, or a defensible reason for expected growth. The mistake is using optimistic growth without support, then presenting the result as if it were a neutral valuation conclusion. Sensitivity analysis can help show how value changes when growth, margin, and risk assumptions move.

A good report should distinguish management projections from the appraiser’s assumptions, explain any adjustments, and avoid presenting best-case scenarios as the base case.

Mistake 5: Ignoring assets, liabilities, and intangible value

A business is not only its income statement. Balance sheet items, off-balance-sheet obligations, contingent liabilities, working capital needs, intellectual property, customer relationships, trade names, workforce, leases, debt terms, and pending disputes can all affect value.

Intangible assets are especially easy to overlook because they may not be fully reflected on the balance sheet. The U.S. Bureau of Economic Analysis tracks investment categories that include intellectual property products, which is a useful reminder that important business value is not limited to physical assets (U.S. Bureau of Economic Analysis [BEA], n.d.). IRS business valuation guidance also identifies goodwill and other intangible value as factors that may be relevant in closely held business valuation work (IRS, 2020).

The opposite error is also common: assigning value to intangibles without support. A trade name, patent, customer list, or software platform should be valued using a method appropriate to the facts, the expected benefits, legal rights, useful life, and risk. Methods such as relief-from-royalty, excess earnings, replacement cost, or with-and-without analysis may be relevant, but the method must fit the asset and the assignment.

Mistake 6: Failing to assess company-specific risk

Two companies in the same industry can have very different risk profiles. One may have recurring revenue, diversified customers, transferable management, clean books, and low debt. Another may depend on one customer, one owner, one supplier, outdated systems, weak documentation, or a pending lawsuit.

Company-specific risk can affect discount rates, capitalization rates, market multiple selection, scenario weights, or qualitative reconciliation. Common risk factors include customer concentration, key-person dependence, supplier concentration, unrecorded liabilities, pending litigation, regulatory exposure, working capital shortages, poor financial controls, revenue volatility, and nontransferable owner relationships.

The mistake is treating industry averages as if they fully describe the subject company. A defensible valuation should connect risk adjustments to the company’s facts, not just use generic language.

Mistake 7: Treating every legal, tax, accounting, or plan purpose the same

A valuation prepared for a business sale may not be adequate for a gift tax filing, divorce matter, Section 409A equity grant, shareholder dispute, financial-reporting exercise, SBA lender review, or ROBS/Form 5500-related plan asset reporting support. The report may need a different standard of value, valuation date, level of value, scope, documentation file, reviewer, or legal assumption.

For Section 409A matters, Treasury regulations address valuation of service recipient stock that is not traded on an established securities market and refer to reasonable valuation methods and, in certain circumstances, independent appraisal evidence (Legal Information Institute, n.d.). That does not make every valuation automatically a Section 409A safe-harbor valuation. The assignment must be scoped for that purpose.

For ROBS-related matters, the IRS describes ROBS arrangements as involving retirement funds used by a plan to purchase stock of a C corporation and notes that IRS project reviews requested information including stock valuation and stock purchases (IRS, n.d.). That supports the need for valuation documentation in the right fact pattern, but it does not create an official product called a Form 5500 valuation report, and it does not replace advice from the plan’s TPA, CPA, or ERISA counsel.

For divorce and litigation matters, the governing law, court order, jurisdiction, and engagement instructions matter. For accounting matters, the applicable financial-reporting framework and CPA review process matter. The valuation assignment should be scoped before the work begins.

Mistake 8: Relying on an unqualified or conflicted valuation source

A valuation can be persuasive only if the user trusts the competence, independence, scope, and documentation behind it. A quick rule-of-thumb estimate may be useful for rough planning, but it should not be confused with a report prepared for tax, legal, lending, transaction, or plan-administration use.

Professional valuation organizations publish standards and ethics materials for their members, and appraisal practice may also be affected by USPAP depending on the credential, engagement, jurisdiction, and intended use (NACVA, n.d.; The Appraisal Foundation, n.d.). Credentials are not a substitute for judgment, but relevant training, experience, independence, and workpaper discipline reduce the chance that the report will rely on unsupported assumptions.

When hiring a valuation provider, ask about the intended use, standard of value, methods, data sources, report format, review process, timing, conflicts, and what is excluded from the scope.

Mistake 9: Waiting until a transaction, dispute, or filing deadline is urgent

Many valuation problems become harder to fix when the deadline is already close. If books are messy, customer concentration is high, owner compensation is undocumented, equipment lists are incomplete, or forecasts are unsupported, the valuation process becomes slower and less reliable.

Periodic valuation work can help owners understand value drivers before a sale, buy-sell event, succession plan, divorce, financing request, tax filing, or retirement-plan reporting need. It can also identify documentation gaps that should be fixed before a buyer, lender, court, taxing authority, or plan adviser asks for support.

The goal is not to value the company constantly. The goal is to avoid discovering a valuation problem only after the number already matters.

Quick diagnostic table

Mistake	Warning sign	Safer question to ask
Wrong method	One approach is used with no explanation	Why does this method fit the business, interest, date, and purpose?
Unnormalized financials	Add-backs are vague or unsupported	What evidence supports each adjustment?
Rate or multiple error	The rate, multiple, and benefit stream do not match	Is the metric pretax or after-tax, control or minority, marketable or nonmarketable?
Unsupported forecast	Growth is assumed without contracts, capacity, or market support	What facts support the forecast and what happens under lower-growth scenarios?
Missing assets or liabilities	The valuation relies only on income statement data	Have intangible assets, debt, working capital, leases, and contingent liabilities been reviewed?
Ignored risk	Industry averages are used without company-specific analysis	Which risks are specific to this company and how are they reflected?
Wrong purpose	A sale estimate is reused for tax, divorce, 409A, or plan reporting	What standard of value, date, and scope does this purpose require?
Weak provider fit	The report is a rule of thumb with no workpaper support	Does the provider have relevant valuation training, independence, and documentation discipline?
Late start	The request begins after a deal, filing, or dispute deadline is near	What documents can be organized before the valuation is needed?

Practical steps to reduce valuation error

1. Define the assignment before calculating value. Identify the intended use, intended users, valuation date, subject interest, standard of value, premise of value, report format, and scope limitations.
2. Gather source documents early. Financial statements, tax returns, debt schedules, ownership records, customer concentration reports, lease documents, equipment lists, legal claims, forecasts, and corporate records should be organized before analysis begins.
3. Separate facts from assumptions. A report should make clear what came from management, what came from public data, what came from third-party documents, and what the appraiser assumed.
4. Reconcile methods thoughtfully. Multiple indications are useful only when the report explains their relative reliability.
5. Avoid promise-based marketing. Be cautious with any provider claiming automatic acceptance by tax agencies, regulators, courts, lenders, buyers, or plan reviewers.
6. Coordinate with advisers. For tax, ERISA, 409A, divorce, litigation, and accounting matters, the valuation provider should understand the assignment, while the client’s attorney, CPA, TPA, or other adviser confirms the legal or reporting requirements.

Frequently Asked Questions (FAQ)

FAQ 1: What is the difference between fair market value and investment value?

Fair market value generally looks to an open-market transaction between a willing buyer and willing seller, with neither compelled to act and both having reasonable knowledge of the facts (IRS, 2025). Investment value is usually specific to a particular buyer or owner and may include synergies, strategic benefits, or owner-specific assumptions. The assignment should state which standard is being used.

FAQ 2: Can I value my business using only a revenue or EBITDA multiple?

A multiple can be a useful reasonableness check when the comparable data is reliable and truly comparable. It is risky when the multiple comes from a different industry, size range, profitability level, growth profile, or transaction structure. Multiples should be tied to the right metric and reconciled with the company’s actual facts.

FAQ 3: How often should a business owner get a valuation?

There is no single schedule that fits every company. Owners commonly consider valuation updates before a sale, buy-sell event, ownership transfer, estate or gift plan, divorce, financing event, shareholder dispute, major strategic change, or retirement-plan reporting need. Periodic updates can also help track value drivers and documentation gaps.

FAQ 4: Does hiring a professional mean every reviewer will accept the valuation?

No. A professional valuation can improve analysis, documentation, and credibility, but acceptance depends on the facts, purpose, law, review process, and quality of the support. Avoid any claim of automatic acceptance or penalty elimination.

FAQ 5: What should I prepare before starting a valuation?

Prepare recent financial statements, tax returns, debt schedules, ownership records, customer and supplier concentration information, lease and equipment details, payroll and owner compensation information, forecasts, legal or contingent liability information, and a clear explanation of why the valuation is needed.

Planning your next move?

Simply Business Valuation provides professional business valuation reports for owners, buyers, CPAs, and advisers. The standard report fee is $399, subject to the stated report scope and exclusions. The service does not include preparing or filing tax forms, ERISA legal advice, plan correction work, audit defense, expert testimony, litigation support, real estate or equipment appraisals, or transaction advisory services unless separately agreed in writing.

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About the author

James Lynsard is a Certified Business Appraiser with over 30 years of experience valuing small businesses. He is USPAP-trained, and his valuation work supports business sales, succession planning, 401(k) and ROBS valuation matters, Form 5500-related reporting support, Section 409A valuation matters, and IRS estate and gift tax matters. Valuation reports support those processes, but they do not replace legal, tax, plan-administration, or accounting advice.

References

• Internal Revenue Service. (2020). 4.48.4 Business valuation guidelines. https://www.irs.gov/irm/part4/irm_04-048-004
• Internal Revenue Service. (2025). Publication 561, Determining the value of donated property. https://www.irs.gov/publications/p561
• Internal Revenue Service. (n.d.). Rollovers as business start-ups compliance project. https://www.irs.gov/retirement-plans/rollovers-as-business-start-ups-compliance-project
• Legal Information Institute. (n.d.). 26 C.F.R. § 1.409A-1, Definitions and covered plans. https://www.law.cornell.edu/cfr/text/26/1.409A-1
• National Association of Certified Valuators and Analysts. (n.d.). NACVA professional standards and ethics. https://www.nacva.com/standards
• The Appraisal Foundation. (n.d.). USPAP. https://appraisalfoundation.org/products/uspap
• U.S. Bureau of Economic Analysis. (n.d.). Investment in fixed assets. https://www.bea.gov/data/investment-fixed-assets