Every option grant a startup issues has a strike price on it, and that number isn’t picked by the founder or the board — it’s set by a 409A valuation, an independent appraisal of what the company’s common stock is worth on that specific day. Get the appraisal wrong, skip it, or let it go stale, and the exposure doesn’t land on the company. It lands on the employee, as a tax bill on income they haven’t received for stock they can’t sell.
The One-Line Version
The IRS treats a stock option priced below fair market value as a form of deferred compensation under Internal Revenue Code §409A, and deferred compensation that doesn’t meet 409A’s rules is taxed early and penalized. A 409A valuation is how a private company establishes, defensibly, what “fair market value” is — so every option it grants can be priced at or above that number and stay outside 409A’s penalty regime entirely.
| If the valuation is right | If it’s wrong or stale | |
|---|---|---|
| Strike price | Set at or above appraised FMV | Can end up below actual FMV without anyone noticing |
| Tax at grant | None | Option holder taxed on the discount at vesting |
| Penalty | None | 20% federal penalty tax, plus interest, on top of regular income tax |
| Who’s exposed | The company pays for the appraisal | The employee or advisor holding the option pays the tax |
Why This Exists: What Happens If You Get the Price Wrong
Under §409A(a)(1)(B), if a deferred-compensation arrangement fails to meet the statute’s requirements, the affected amount is included in income immediately and hit with “an amount equal to 20 percent of the compensation,” plus interest at the underpayment rate plus one percentage point, calculated back to when the deferral should have been taxed (26 U.S.C. §409A). A stock option is exempt from being treated as deferred compensation in the first place only if, among other requirements, its exercise price is no less than the fair market value of the underlying stock on the grant date.
An option granted at a discount to FMV doesn’t fail quietly. The holder is taxed on the spread at vesting — not at exercise, and not at sale — plus the 20% penalty, plus interest that has been accruing since the violation occurred. On a modest discount this can still be a meaningful bill on stock the employee has no way to sell to cover it; several state tax codes (California’s among them) add their own penalty on top of the federal one.
The practical upshot: nobody wants to find out, during a later financing round’s diligence or an acquirer’s legal review, that a batch of options was granted below FMV because the valuation on file was expired or the strike price was set by guesswork. A current 409A valuation is what keeps that question from ever coming up.
How the Valuation Actually Gets Done
A 409A valuation isn’t a single formula — the AICPA’s valuation guidance recognizes three methods, and which one an appraiser leans on depends on the company’s stage:
- The Option Pricing Model (OPM), typically via the “backsolve” variant. The appraiser builds a model of the full capital structure — every class of preferred stock, its liquidation preferences, conversion rights — and solves for the total equity value that makes the model’s implied price for the most recently sold class of preferred equal to what investors actually paid in the last round. This is the standard method for any startup that has raised a priced round, because it anchors the valuation to a real, recent, arm’s-length transaction rather than a projection.
- The Probability-Weighted Expected Return Method (PWERM). The appraiser models several future outcomes for the company (an acquisition, an IPO, a shutdown, staying private) and assigns each a probability, then derives value from the probability-weighted result. More common closer to a known exit.
- The Current Value Method (CVM). Enterprise value is estimated directly and allocated across share classes by liquidation preference. Rarely used once a company has any real preferred stock structure, since it doesn’t account for how option-like the different share classes are relative to each other.
For a typical venture-backed startup, that means the valuation an appraiser hands back after a Series A is, in effect, a translation of “investors just paid $X per share of Series A preferred” into “here’s what a share of plain common stock — with none of that preferred stock’s protections — is worth today.” That translated number becomes the floor for every option strike price until the next valuation.
The Safe Harbors — and Why Companies Actually Use Them
409A doesn’t require perfection; it offers a presumption of reasonableness to any company that follows one of three defined safe harbors under Treasury Regulation §1.409A-1(b)(5)(iv):
- Independent appraisal. A valuation from a qualified independent appraiser is presumed reasonable for up to 12 months from its effective date, as applied to any grant made within that window.
- Illiquid startup safe harbor. A written, good-faith valuation by someone with “significant knowledge, experience, education, or training” in the relevant valuation methods, prepared for a company with no public trading in its stock and no material operating history — but only if the company doesn’t reasonably anticipate a sale or IPO within roughly the following 90–180 days.
- Formula-based valuation, tied to a fixed, consistently-applied formula under the nonlapse-restriction rules of §1.83-5 — rare in practice outside of specific buy-sell arrangements.
Almost every funded startup uses the first safe harbor: pay an independent valuation firm, get a written report, and rely on the presumption for a year. Without it, the IRS can challenge the company’s own valuation directly, and the burden shifts to the company to prove the number was reasonable rather than the other way around — which is the entire reason startups pay for these reports instead of estimating internally.
When You Actually Need a New One
The independent-appraisal safe harbor’s presumption expires at 12 months, or sooner, whichever comes first, if a material event happens in between. In practice, “material event” almost always means one of:
- A new priced financing round — the most common trigger. A fresh round is direct market evidence of value, and it’s the exact kind of information a stale valuation is presumed not to reflect anymore.
- A significant secondary sale of company shares at a materially different price.
- A major shift in the business — an acquisition, a large new contract, a significant pivot, or credible acquisition/IPO discussions.
Granting options off a valuation whose safe harbor has already lapsed — whether from age or from an intervening material event — forfeits the presumption of reasonableness on every option priced from it, which is exactly the exposure the safe harbor exists to avoid.
What It Costs and How Long It Takes
Pricing varies with company stage, cap table complexity, and which type of provider does the work, but for a company that has raised outside capital, roughly $2,000–$6,000 per valuation is a reasonable expectation, with self-serve or AI-assisted platforms sometimes pricing seed-stage reports lower and larger firms or complex cap tables running well past $10,000. Annual refreshes without an intervening material event typically cost less than the initial report. Turnaround is usually one to three weeks depending on the provider and how quickly the company supplies its cap table and financials.
Common Mistakes
- Letting a valuation lapse without noticing. The 12-month clock doesn’t send its own reminder — it’s easy to keep granting options for weeks past expiration if nobody is tracking the date.
- Not ordering a refresh after closing a round. The new round is the exact kind of material event that invalidates the old safe harbor; granting options off the pre-round valuation afterward is a common, avoidable mistake.
- Treating the 409A price as the company’s “real” valuation. A 409A values illiquid, minority common stock — it is deliberately lower than the price investors just paid for preferred stock with liquidation preferences and other protections. Founders sometimes mistake a low 409A for bad news about the company; it’s a different question entirely, addressed directly in the valuation report itself.
- Using stale or informal numbers for early hires’ strike prices before a first outside appraisal exists, rather than getting even a first appraisal in place before granting meaningful equity.
- Ignoring the illiquid-startup safe harbor’s IPO/sale lookback. If a sale or IPO becomes reasonably likely within roughly 90–180 days, that safe harbor stops applying — a detail that matters most for companies leaning on it instead of a paid independent appraisal.
FAQ
Who has to get a 409A valuation?
Any private U.S. company that grants stock options or other equity compensation needs one to price those grants defensibly. It’s not a public filing requirement — it’s what protects the company and its option holders from the IRS treating option grants as improperly priced deferred compensation.
How is a 409A valuation different from what my company is “worth” to investors?
A 409A prices illiquid common stock — the class founders and employees typically hold — which by design is worth less per share than the preferred stock investors buy, because preferred stock carries liquidation preferences and other protections common stock doesn’t have. A lower 409A number relative to the last round’s preferred price is normal and expected, not a signal the company lost value.
What happens if we grant options at the wrong price?
The option holder — not the company — bears most of the direct tax exposure: income tax on the discount at vesting rather than at exercise, plus a 20% federal penalty tax and accrued interest. Companies typically still face reputational and cap-table cleanup costs, and it’s a red flag in diligence for a future round or acquisition.
Do we need a new 409A every time we grant an option?
No — a single valuation covers every grant made within its 12-month safe-harbor window, as long as no material event (most commonly a new financing round) has happened in between.
Can we use a free or DIY 409A calculator instead of a paid appraisal?
You can, but it won’t carry the presumption of reasonableness that a qualified independent appraisal or the formal illiquid-startup safe harbor provides — meaning the burden falls on the company to defend the number if it’s ever challenged. Most companies decide the cost of a real appraisal is small next to that risk.
A 409A valuation is the number that turns into the strike price on the ISO vs. NSO grants a company issues and the AMT preference item employees calculate when they exercise, and it’s the same fair-market-value question that shows up when reading a cap table or checking QSBS eligibility on founder shares. Brad Feld and Jason Mendelson’s Venture Deals is a useful plain-English reference for how a priced round’s terms feed into exactly this kind of valuation math. For more on structuring founder and employee equity deliberately, see the finance section on FutureSharks.
