If your company grants stock options, you need a defensible answer to one question: what is our common stock worth today? That answer is a 409A valuation, and getting it wrong does not hurt the company first. It hurts your employees, who can face immediate income tax, a 20% additional federal tax, and interest charges on options the IRS decides were granted below fair market value.
This guide explains what a 409A valuation is, when you need one, how the IRS safe harbor works, which methods appraisers use, and what founders and CFOs can do to get a clean, defensible report the first time.
Key Takeaways
- A 409A valuation sets the fair market value of common stock so option strike prices do not trigger penalties for employees.
- The independent appraisal safe harbor shifts the burden to the IRS to prove the value was grossly unreasonable.
- Reports are generally good for up to 12 months, but a financing round, term sheet, or major business change makes them stale.
- Appraisers value the whole company first, then allocate value to common stock and apply a marketability discount.
What Is a 409A Valuation?
A 409A valuation is an independent appraisal of the fair market value (FMV) of a private company’s common stock. It takes its name from Section 409A of the Internal Revenue Code, which governs nonqualified deferred compensation. Stock options and stock appreciation rights escape 409A’s harsh rules only if the exercise price is at least equal to the FMV of the underlying stock on the grant date.
In practice, that means your board needs a reliable FMV before it sets a strike price. A 409A report gives the board that number and documents how it was reached.
Key point: The 409A value is usually lower than the price investors paid for preferred stock. Preferred shares carry liquidation preferences, dividends, and protective rights that common stock does not, which is why the term “cheap stock” is sometimes used.
Why the Stakes Are So High
When options are granted below FMV, they are treated as deferred compensation that fails Section 409A. The consequences land on the option holder:
- The spread becomes taxable income as the options vest, not when they are exercised.
- An additional 20% federal tax applies on top of ordinary income tax.
- Premium interest is charged on the underpayment.
- Some states, historically including California, have imposed their own additional tax.
For the company, the fallout includes amended payroll reporting, unhappy employees, repricing costs, and diligence problems when an acquirer or underwriter reviews your equity history. A clean 409A history is one of the first things a buyer’s counsel checks.
The Three IRS Safe Harbors
The Treasury regulations give private companies three ways to establish a presumption that their valuation is reasonable. When a safe harbor applies, the IRS must prove the value was “grossly unreasonable” to challenge it. That shift in the burden of proof is the main reason companies pay for an independent report.
| Safe harbor | Who qualifies | Key condition |
|---|---|---|
| Independent appraisal | Any private company | Performed by a qualified independent appraiser, as of a date no more than 12 months before the grant |
| Illiquid start-up | Companies under 10 years old with no expected sale or IPO soon | Prepared by someone with significant knowledge and experience (generally five or more years of relevant experience) |
| Binding formula | Companies that use the same formula for all transfers | Formula is used consistently for both compensatory and non-compensatory stock transactions |
Most venture-backed and growth companies rely on the independent appraisal safe harbor because it is the easiest to support and the hardest for the IRS to challenge.
When Do You Need a 409A Valuation?
The short answer is before you grant options and at least every 12 months after that. The longer answer is that certain events make an existing report stale, even if it is less than a year old:
- A new priced equity round (seed, Series A, and later)
- A secondary sale of common stock at a meaningful price
- A significant change in revenue, a major customer win or loss, or a pivot in the business model
- Receipt of a term sheet or letter of intent to acquire the company
- Preparation for an initial public offering
- A material change in the capital structure, such as a new class of preferred stock or a large debt facility
If any of these occur, refresh the valuation before the next grant. Granting options on a pre-financing 409A after you have closed a priced round is one of the most common and expensive mistakes we see.
How Appraisers Value Startup Common Stock
A 409A valuation usually happens in two stages. First, the appraiser determines the value of the whole company (the “enterprise” or “equity value”). Second, that value is allocated among the classes of stock, and a discount is applied to the common shares to reflect their lack of marketability.
Stage 1: Valuing the Company
- Market approach (backsolve): For companies that recently raised money, the appraiser works backward from the price paid for preferred stock to infer the value of the whole company. This is often the most persuasive evidence available for early-stage companies.
- Market approach (comparables): The appraiser compares the company to public companies or acquisitions of similar businesses, using metrics such as revenue or EBITDA multiples.
- Income approach: A discounted cash flow analysis based on management’s projections. This carries more weight for companies with predictable revenue.
- Asset approach: Used for very early companies with little operating history, where value is roughly the cash and assets on hand.
Stage 2: Allocating Value to Common Stock
- Option pricing method (OPM): Treats each class of stock as a call option on the company’s equity, with breakpoints set by liquidation preferences. This is the most common method for early-stage companies with uncertain exits.
- Probability-weighted expected return method (PWERM): Models specific exit scenarios (sale, IPO, dissolution) and weights them by probability. Useful when an exit is foreseeable.
- Hybrid method: Combines the two, typically using PWERM for a near-term exit scenario and OPM for everything else.
- Current value method: Appropriate only when a liquidity event is imminent or the company is in an early stage with no material progress.
Finally, a discount for lack of marketability (DLOM) is applied because private common stock cannot be readily sold. You can read more about how that discount is supported in our guide to the discount for lack of marketability.
What You Will Need to Provide
Getting the document request right shortens the timeline from weeks to days. A typical 409A data request includes:
- Current capitalization table, including all options, warrants, SAFEs, and convertible notes
- Articles of incorporation and the terms of each class of preferred stock
- Recent financing documents, term sheets, and any secondary sale records
- Historical financial statements and the current year-to-date results
- Management’s financial projections, usually three to five years
- A short description of the business, products, competitors, and key risks
- Any prior 409A reports and the reasons for changes since the last one
Common 409A Mistakes to Avoid
- Granting options before the report is final. The board should approve grants after it has reviewed the valuation, not before.
- Ignoring a material event. A new term sheet can invalidate last quarter’s report overnight.
- Shopping for the lowest number. An unusually low value invites scrutiny in audits and acquisitions. Defensibility matters more than a few cents per share.
- Projections that do not match the pitch deck. If your fundraising deck projects aggressive growth and your 409A projections are flat, expect questions from auditors and acquirers.
- Losing track of SAFEs and notes. Unconverted instruments still affect the waterfall and must be modeled.
409A Valuation and Financial Reporting
The same common stock value often feeds your stock-based compensation expense under ASC 718. Auditors will review the 409A report to support the fair value of awards, so a report prepared with audit standards in mind saves time at year end. The AICPA’s accounting and valuation guide on privately held company equity securities issued as compensation is the professional reference most auditors use when they review these reports.
Illustrative Example: The Post-Financing Trap
Consider a hypothetical Boston software company that obtained a 409A valuation in January concluding common stock was worth $0.80 per share. In May it closed a Series A at $3.20 per preferred share and, in June, the board approved a new batch of option grants at $0.80, relying on the January report because it was “less than a year old.”
That is a classic mistake. The Series A is a material event: it provides new, arm’s-length evidence of value and usually changes the company’s risk profile and runway. A refreshed valuation using a backsolve from the Series A price might conclude common stock is worth $1.10 per share. The June grants would then be priced below fair market value, exposing every recipient to potential income inclusion at vesting, a 20% additional tax, and interest.
The fix was simple and inexpensive if done in time: pause the grants, order a bring-down valuation as of the closing date, and approve grants at the new value. The lesson for founders and CFOs is to put a 409A refresh on the closing checklist for every financing round, secondary sale, or acquisition discussion, so option grants always rest on a current, defensible number.
Frequently Asked Questions
Up to 12 months under the independent appraisal safe harbor, provided no material event occurs in the meantime. A new financing round, acquisition offer, or major change in the business generally requires a new report.
Fees depend on the complexity of the capital structure and the stage of the company. An early-stage company with one class of preferred stock costs far less than a late-stage company with multiple series, debt, and secondary transactions. Ask for a fixed fee that includes auditor support.
They can, but it would not fall under the independent appraisal safe harbor. Using a qualified, independent valuation professional is the simplest way to secure the presumption of reasonableness.
Yes, if the LLC grants profits interests or options on units, a similar valuation exercise is needed. Profits interests have their own tax rules, but the economic analysis is closely related.
Talk to tax counsel quickly. Depending on timing, there may be correction programs that reduce the damage, particularly if options have not yet vested or been exercised.
Get a Defensible 409A Valuation
Foxboro Consulting Group, Inc. prepares independent 409A and “cheap stock” valuations for privately held companies across Massachusetts, New England, and the Northeast. Our valuation professionals hold credentials recognized by the IRS, auditors, and the courts, and every report is built to stand up to audit and acquisition diligence.
Ready to set your next option grant with confidence? Contact Foxboro Consulting Group to discuss your capitalization table, timeline, and fixed-fee options.
