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409A Valuation for CPAs: What Your Startup Clients Need

CPAs and accounting firms serving startup clients are often the first professionals to identify when a 409A valuation is needed. CPAs must understand the 409A requirement to properly advise clients on ASC 718 stock-based compensation accounting, IRS compliance, and the timing of option grants relative to material events.

Published August 13, 2026
Updated August 15, 2026
3 min read

Quick Answer

CPAs and accounting firms serving startup clients are often the first professionals to identify when a 409A valuation is needed. CPAs must understand the 409A requirement to properly advise clients on ASC 718 stock-based compensation accounting, IRS compliance, and the timing of option grants relative to material events.

Key Takeaways

  • CPAs are often the first to identify when a startup client needs a 409A valuation
  • ASC 718 stock-based compensation accounting requires the 409A FMV as an input for Black-Scholes calculation
  • CPAs must flag to clients when their 409A has expired (12 months) or when a material event requires a new valuation
  • The 409A valuation is the input that determines the exercise price in the Black-Scholes model for ASC 718 purposes
  • CPAs should review the 409A methodology section to ensure it aligns with ASC 718 fair value measurement standards
  • Clients who issue options without a valid 409A create significant tax liability that affects financial statements
  • Recommending a 409A provider is part of responsible startup advisory — CPAs who do not will see this become an issue at audit

Why CPAs Need to Understand 409A Valuations?

As a CPA serving startup clients, you are often the professional who catches 409A compliance issues before they become expensive problems. Understanding the 409A requirement — and when to flag it to clients — is an essential part of startup advisory practice.

When to Recommend a 409A to Your Client?

Flag the 409A requirement when your client:

  • Is setting up an employee option pool for the first time
  • Is about to issue options to new hires and their current 409A is expired or missing
  • Has closed a new funding round (priced or SAFE) — material event requiring a new 409A
  • Has received an acquisition offer — material event
  • Has not obtained a new 409A within the past 12 months
  • Has experienced significant revenue growth or contraction — may trigger a new 409A depending on materiality

409A and ASC 718

For financial reporting purposes, ASC 718 requires companies to expense stock-based compensation at grant date fair value. The 409A FMV is a key input in calculating this expense using the Black-Scholes model:

  • Stock price (S) — the 409A FMV per common share at grant date
  • Exercise price (K) — must equal the 409A FMV (same as S for at-the-money options)
  • Volatility (σ) — the 409A report should document the volatility assumption used
  • Risk-free rate (r) — derived from US Treasury rates
  • Expected term (T) — based on SAB 110 simplified method or historical data

A well-prepared 409A report provides all inputs needed for the ASC 718 calculation. Review the methodology section to ensure the volatility and DLOM assumptions are documented and supportable.

What to Look for in a 409A Report

When reviewing a client's 409A report for ASC 718 purposes, verify:

  1. Credentials — the report is signed by a CVA, ABV, or equivalent credentialed analyst
  2. Independence — the appraiser is independent from the company
  3. Methodology — DCF, GPC, and/or backsolve methods are documented
  4. OPM allocation — the report shows how enterprise value was allocated between preferred and common
  5. DLOM — the discount for lack of marketability is documented with support
  6. Volatility assumption — documented and based on peer companies
  7. Date — the effective date of the valuation is on or before the option grant date

Common 409A Issues You Will See in Practice

  • Expired valuation — client continues granting options after the 12-month period
  • Missing post-round valuation — client raised a Series A but did not update their 409A
  • Instant/automated reports — client used a tool that produces a report without analyst review — not defensible
  • Exercise price below FMV — options were granted at a price the board "felt was right" without an independent appraisal

Recommending a Provider

As a CPA, recommending a qualified 409A provider is part of responsible client advisory. We work with CPA firms on a referral basis and are happy to discuss how to streamline the 409A process for your startup clients. Contact us at support@409avaluationpro.com.

Educational Content — Not Tax or Legal Advice

The information on this page is provided for general educational purposes only. It does not constitute tax advice, legal advice, or a formal valuation opinion. Every company's situation is different — consult a qualified tax adviser, attorney, or certified valuation analyst before making decisions based on this content.

State law may vary. Individual US states may impose additional income tax, excise tax, or reporting obligations on nonqualified deferred compensation and stock options. California, for example, imposes an additional penalty tax of up to 20% on top of federal penalties. Always review applicable state rules with local counsel.

Primary source: IRC Section 409A and the final Treasury Regulations under T.D. 9321 (IRS Internal Revenue Bulletin 2007-19). For the most current IRS guidance, penalties, and safe harbor requirements, refer to the IRS IRC 409A Overview page directly.

Content last reviewed: August 2026. Tax law changes frequently — readers are encouraged to verify current rules with the IRS or a qualified professional before relying on this content.

409A Valuation Pro is not affiliated with, endorsed by, or sponsored by the Internal Revenue Service or any US government agency. IRS, Internal Revenue Service, and related names are trademarks of the US Department of the Treasury.

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