409A Valuations for Startups: Cost, Timing & Rules

What Is a 409A Valuation?

A 409A valuation is an independent appraisal of the fair market value (FMV) of your company’s common stock. The name comes from Section 409A of the Internal Revenue Code, which among other things, governs how private companies price the equity they hand to employees.

That per-share FMV becomes the strike price, the amount an employee pays to exercise a stock option. Set the strike price at or above fair market value and your options are compliant. Set it below, and the IRS treats the discount as deferred compensation, which comes with steep tax consequences we will get to shortly.

The key word is independent. Founders cannot set their own common stock price and call it a day. Neither can your lawyer or accountant. The valuation has to reflect a defensible view of what the company is actually worth, backed by real methodology.

Why the 409A Exists

Stock options are one of the most powerful tools a startup has for attracting talent it might not otherwise be able to afford. The 409A rules exist to stop companies from gaming that system by granting deeply discounted options and dodging taxes on what is effectively compensation.

For founders, the 409A does two things. It protects your employees from a surprise tax event, and it gives your company a documented, audit-ready basis for every option grant you make.

When Do You Need a 409A Valuation?

You need a valid 409A in place before you grant your first stock option. After that, the rule is simple: refresh it at least every 12 months, or sooner if something material changes the value of your business.

Here are the events that trigger a new 409A:

1. Your first option grant. Before any equity goes out the door, you need a valuation on file.
2. A new funding round. This is the most common trigger. Raising a round from investors resets what your company is worth, so your prior 409A no longer holds.
3. The 12-month clock runs out. A 409A carries safe harbor protection for up to 12 months. Once it expires, you need a fresh one before granting more options.
4. A material event. A major acquisition offer, a large new customer that significantly transforms revenue, a pivot, or a secondary sale of shares can all move your valuation enough to require an update.

Miss any of these and your option grants lose their safe harbor footing, which is where the real risk starts.

Safe Harbor: The Protection You’re Paying For

When an independent, qualified professional prepares your 409A using IRS-accepted methods, the valuation earns safe harbor status. That flips the burden of proof. Instead of you having to prove your valuation was reasonable, the IRS has to prove it was “grossly unreasonable” to challenge it. That is a high bar, and it makes successful challenges rare.

The IRS recognizes three safe harbor methods. The one nearly every venture-backed startup uses is the independent appraisal method, a valuation performed by a qualified third party within the prior 12 months. The other two, a binding formula method and an illiquid startup presumption, apply to narrower situations.

What Happens If You Get It Wrong

If you grant options below fair market value and the IRS reclassifies them as deferred compensation, the consequences land on your employees, not just the company.

An employee holding underpriced options can owe:

• Immediate income tax on vested options, even though they have not sold a single share or seen a dollar of cash.
• A 20% federal penalty tax on top of ordinary income tax.
• Interest charges on the amount owed.
• State penalties stacked on top. In a high-tax state like California, combined federal and state liability can exceed 50% of the option’s spread.

Your team took equity in place of a bigger salary. A botched 409A turns that upside into a tax bill. It is one of the fastest ways to lose trust with the people you most need to keep.

What Does a 409A Valuation Cost in 2026?

Most startups pay somewhere between $1,500 and $9,000, and where you land comes down to stage and complexity. A pre-revenue company with a clean cap table, no institutional investors, and no convertible instruments sits at the low end, often $1,500 to $3,500. Costs climb toward the top of the range, and past it, as you take on revenue, multiple funding rounds, and layered preferred stock. Series A and B companies typically spend $2,500 to $6,000, while late-stage and pre-IPO companies working with Big 4 or enterprise firms can pay $10,000 to $25,000 or more once SEC scrutiny is in play. Annual renewals usually run 30%-40% less than your first valuation, since the appraiser already knows your business.