409A Valuation: What It Is and How It Affects Your Equity

A 409A valuation is an independent appraisal that determines the fair market value (FMV) of a private company's common stock. It is required by Section 409A of the Internal Revenue Code for any private company that issues stock options or other equity compensation to employees, contractors, advisors, or directors. The resulting FMV sets the minimum legal strike price for stock options — grant options below that price and the company has violated federal tax law, exposing employees to immediate income tax plus a 20% penalty even before they exercise a single share.

For employees at private companies, the 409A valuation is the most important number in your offer letter that nobody mentions by name. Recruiters talk about the company's post-money valuation — "we just raised at a $200 million valuation!" — but the 409A is the number that determines what your options actually cost, what your tax basis is, and how much you owe the IRS at every taxable event. Understanding how these two numbers relate is the foundation of evaluating any private company equity offer.

Why Section 409A Exists

Before 2004, private companies had significant flexibility in how they priced stock options. Some companies priced options well below the fair market value of their stock, effectively providing employees with immediate taxable value at the time of grant — which should have been reported as income. The American Jobs Creation Act of 2004 added Section 409A to the Internal Revenue Code specifically to close this loophole and establish uniform rules for nonqualified deferred compensation, including stock options.

Under Section 409A, the strike price of a stock option must equal or exceed the FMV of the underlying stock on the grant date. If options are granted below FMV — even accidentally, due to a stale or unsupported valuation — the consequences are severe:

• The employee owes ordinary income tax on the discount immediately, in the year it is granted — not when exercised
• An additional 20% penalty tax applies on top of the ordinary income tax
• Interest accrues on the underpayment from the original grant date

These penalties apply to the employee, not just the company. A company that accidentally underprices options does not absorb the tax bill on your behalf.

What a 409A Valuation Actually Measures

The 409A valuation establishes the FMV of common stock — the class of stock held by founders, employees, and early investors who receive options or RSAs. This is distinct from the preferred stock that venture capital investors typically receive in funding rounds.

Common stock and preferred stock in the same company have very different economic rights. Preferred stockholders have:

• Liquidation preferences — in most acquisitions, preferred investors get their money back before common stockholders receive anything
• Anti-dilution protections — preferred stock is often protected against value erosion from down rounds
• Dividend rights — preferred holders may receive dividends before common shareholders
• Participation rights — in some structures, preferred can both recover their investment and participate in the remaining proceeds

Because common stock sits at the bottom of the capital structure, a qualified appraiser determines its FMV using conservative assumptions, including discounts for:

• Lack of marketability (DLOM) — private company stock cannot be sold freely; this illiquidity reduces its value relative to equivalent public stock
• Lack of control (DLOC) — an employee holding a small minority stake has no ability to control company decisions or force a liquidity event

These discounts, combined with the inferior economic rights of common stock, mean the 409A FMV of common stock is always lower than the implied value of preferred stock — and always lower than the headline post-money valuation.

The 409A vs. Preferred Valuation Gap

The gap between a company's 409A valuation and its preferred (post-money) valuation is not a mistake or an accounting trick. It reflects the fundamental difference between what a VC investor pays for preferred stock and what the FMV of common stock actually is at the same moment.

Based on Carta data covering thousands of US private companies across funding rounds completed in 2019–2023, here is how the 409A typically relates to the post-money preferred valuation by stage:

The gap narrows at later stages for two reasons: later-stage companies have more predictable financials that reduce valuation uncertainty, and the liquidation preferences of preferred stock become relatively smaller as a percentage of total value. But even at Series D, the 409A is typically only 39% of the preferred valuation — meaning common stock FMV is less than half the number investors use when they talk about the company's worth.

Practical example: A company raises a Series B at a $100 million post-money valuation. The 409A valuation conducted shortly afterward determines the FMV of common stock at $34 million. An employee granted 10,000 options at a $3.40 strike price (the per-share 409A value) has options that are legally priced at FMV — even though the per-share implied preferred value is roughly $10.00.

When a 409A Is Required and How Long It Lasts

A 409A valuation is required before issuing stock options or other equity compensation that is priced based on FMV. The valuation is valid for 12 months from its measurement date, or until a material event occurs — whichever comes first.

Material events that require an immediate new valuation include:

• Closing a new equity financing round (Series A, B, C, convertible notes that convert to equity, SAFEs with a priced round)
• A significant increase or decrease in revenue (typically 20%+ change from the valuation baseline)
• Receiving or making an acquisition offer
• Launching a materially new product line or entering a new market
• A significant change in competitive landscape or loss of a major customer
• Beginning the IPO process

A company that grants options using a valuation older than 12 months — or after a material event has occurred without a new valuation — loses the IRS safe harbor. The IRS can challenge the strike price and reclassify the options as underpriced, triggering penalties for the employees who received those grants.

The Safe Harbor Protection

The IRS safe harbor is the practical reason why nearly all venture-backed companies use independent third-party firms for their 409A valuations rather than conducting them internally. When a company obtains a valuation from a qualified independent appraiser following IRS guidelines, the safe harbor creates a legal presumption that the FMV is reasonable. The burden of proof shifts: the IRS must show the valuation is "grossly unreasonable" to challenge it, rather than the company having to prove it is correct.

To qualify for the safe harbor, the appraiser must:

• Be independent of the company (no financial interest, no family relationships with owners)
• Have at least five years of relevant experience in business valuations
• Hold recognized professional credentials (ASA, ABV, CVA, CFA, or equivalent)
• Use recognized valuation methodologies and document all assumptions
• Deliver a written, comprehensive report

Without the safe harbor — for example, if a company uses an outdated valuation or conducts an internal estimate — the valuation is still presumptively reasonable under a lower-standard "reasonable application of a reasonable method" test, but it is far more vulnerable to IRS challenge.

How the Valuation Is Calculated

A 409A appraisal has two steps: determining the total enterprise value of the company, then allocating that value across the company's different classes of securities to arrive at the per-share FMV of common stock.

Step 1 — Enterprise value. Appraisers use one or more of three standard approaches, weighted by what is appropriate for the company's stage:

• Income approach: Discounts projected future cash flows back to present value at a risk-adjusted rate. More relevant for profitable companies with predictable revenue.
• Market approach: Compares the company to publicly traded peers or recent private transactions using multiples (revenue, EBITDA, ARR). Dominant for venture-backed SaaS and technology companies.
• Asset approach: Values the company based on the fair value of its net assets. Rarely used except for very early stage or asset-heavy companies.

Step 2 — Equity allocation. Once the enterprise value is established, the appraiser must determine how that value is distributed across preferred stock, common stock, options, and warrants. The most common methods are:

• Option Pricing Method (OPM): Treats each class of stock as a call option on the enterprise value. Most appropriate for early-stage companies with uncertain exit timing.
• Probability-Weighted Expected Return Method (PWERM): Models several discrete exit scenarios (IPO, acquisition, continued private) with assigned probabilities. More appropriate for later-stage companies with clearer exit paths.
• Current Value Method (CVM): Used in simple cap table structures or distressed situations.

After allocating value to common stock, the appraiser applies the DLOM and DLOC discounts to arrive at the final per-share FMV.

What This Means When Reviewing Your Offer

When a company makes you an equity offer, ask for both numbers: the most recent 409A FMV per share of common stock, and the most recent preferred share price (the price investors paid in the last round). These two numbers tell you where you stand in the capital structure.

Specifically ask:

• What is the current 409A FMV per share?
• When was the last 409A completed?
• Is there a new funding round in progress or recently closed? (A round that closed after the last 409A means the valuation may be stale.)
• What is the strike price of the options being offered? It should equal the 409A FMV.

A strike price above the 409A FMV means your options are underwater before they even vest — you would be paying more than FMV for shares. A strike price exactly at FMV is standard. A strike price below FMV is an IRC 409A violation — a red flag that suggests either an error or an attempt to circumvent tax rules that will likely hurt you.

For a full checklist of what to review when evaluating a private company equity offer, see Negotiating Equity Compensation at a Private Company.

California Note

California conforms to the federal Section 409A framework — there is no separate California valuation requirement. However, California taxes all equity compensation income as ordinary income at rates up to 13.3%, with no preferential capital gains treatment for most equity events. The 13.3% rate represents the 12.3% top bracket plus a 1% Behavioral Health Services Tax surcharge that applies only to taxable income above $1 million. The 409A FMV is particularly important for California employees because it establishes the basis for ordinary income calculations at exercise (for NSOs) and at vesting (for RSUs and RSAs) — and those amounts are taxed at full California rates.

California also does not recognize the QSBS (Section 1202) exclusion that can eliminate federal capital gains tax on qualifying startup stock gains. Gains that are entirely tax-free at the federal level are still fully taxable in California. Note that the federal QSBS rules changed significantly under the One Big Beautiful Bill Act (OBBBA), signed July 4, 2025: for stock issued after that date, the gross assets threshold increased from $50 million to $75 million, the per-issuer gain exclusion cap increased from $10 million to $15 million, and a tiered holding period was introduced (50% exclusion at 3 years, 75% at 4 years, 100% at 5 years). None of these federal improvements affect California treatment — the state still taxes all such gains as ordinary income. See Qualified Small Business Stock (QSBS) for how this interaction works.

This article is for educational purposes only and does not constitute tax, legal, or financial advice. Section 409A rules are complex, and errors in valuation can have significant tax consequences for employees. Always consult a qualified tax advisor when evaluating equity compensation.