409A Valuation: A Guide for Startup Attorneys

Startup attorneys — including those at corporate law firms, emerging growth practices, and solo practitioners — regularly advise clients on IRC Section 409A compliance as part of equity plan formation, option grant timing, and M&A due diligence. Understanding the 409A requirement, safe harbor standards, and how to evaluate a 409A report enables attorneys to provide comprehensive advice and avoid malpractice exposure from overlooking this critical compliance requirement.

Published August 13, 2026

Updated August 15, 2026

3 min read

Key Takeaways

Startup attorneys are frequently the first legal advisor to identify when a 409A valuation is needed

409A safe harbor requires an independent qualified appraiser — board-determined FMV does not provide safe harbor

Attorneys should advise clients to obtain a new 409A after every priced round, SAFE closing (if options will be granted), or material event

The 409A FMV determines the exercise price — attorneys reviewing option agreements should confirm the FMV is supported by a current 409A

M&A due diligence should include reviewing all 409A valuations covering periods when options were granted

Attorneys at firms like Cooley, Wilson Sonsini, and Goodwin regularly refer clients to independent 409A providers

A 409A non-compliance issue discovered during M&A can delay or reduce deal value — remediation options are limited once discovered

The Startup Attorney's Role in 409A Compliance

As a startup attorney, you are frequently the professional who raises the 409A issue with clients — often when drafting stock option plan documents, reviewing board resolutions approving option grants, or conducting pre-financing legal diligence. Understanding the legal framework and knowing when to recommend an independent valuation is essential to your advisory role.

The Safe Harbor Standard

IRC Section 409A provides a safe harbor from additional taxes when options are granted at fair market value as determined by a "qualified independent appraiser." This safe harbor has three requirements:

Independence — the appraiser must be independent from the company (no equity, employment, or material business relationship)
Qualifications — the appraiser must have significant knowledge, experience, education, and training in performing similar valuations
Reasonable valuation method — the appraiser must use a reasonable method taking into account all available information material to the company's value

Board-determined FMV does not qualify for safe harbor for companies that have received third-party financing.

When to Advise a Client to Obtain a 409A?

Before the first option grant from a newly formed entity
After any priced financing round closes
After a SAFE or convertible note closes, if options will be granted before the next priced round
After 12 months from the last valuation date (regardless of financing activity)
After receiving any bona fide acquisition offer
After a significant change in the company's financial performance
Before a financing round closes (pre-round 409A) if options need to be granted during the fundraising process

M&A Due Diligence: 409A Review

When conducting M&A due diligence on an acquisition target, include in your equity diligence:

All 409A valuations for the past 5 years
All option grant dates and exercise prices during the same period
Whether any grants were made (a) before a 409A was obtained, (b) after a 409A expired, or (c) after a material event without an updated 409A

Identified 409A gaps at due diligence can result in escrow holdbacks, purchase price reductions, or representations and warranties insurance exclusions. Remediation options for past non-compliance are limited — disclosure and IRS compliance programs exist but are complex and expensive.

What to Look for in a 409A Report

When reviewing a 409A for a client, verify:

Effective date is on or before the option grant date
The report is signed by a named, credentialed appraiser (CVA, ABV, CFA, ASA)
The appraiser's independence is documented
The report documents the methodology (DCF, GPC, backsolve, OPM as appropriate)
The DLOM is documented and supportable
The report covers the correct entity (the entity granting the options, not a parent or subsidiary)

Working with 409A Providers

We work regularly with startup attorneys and their clients. We are happy to discuss specific client situations, explain our methodology, or provide auditor support letters for clients going through financing or acquisition diligence. Contact us at support@409avaluationpro.com.