Corporate Finance

409A Valuation: What Founders and CFOs Need to Know

Amy Richards | | 5 min read

A 409A valuation is the independent appraisal of the fair market value (FMV) of your company's common stock. It is the single most consequential number in your equity compensation program — determining the exercise price of every new stock option grant, the reported value of employee compensation on tax forms, and the potential tax liability for employees who exercise their options. Getting it wrong in either direction creates serious problems: too high and your employees face unexpected tax bills; too low and the IRS may challenge your option grants as underpriced, creating penalties for the company and its employees.

What Is a 409A Valuation and Why Does It Exist?

Section 409A of the US Internal Revenue Code governs non-qualified deferred compensation arrangements, including most stock options and other equity awards issued by private companies. Under 409A, if a company grants stock options with an exercise price that is less than the fair market value of the underlying common stock at the grant date, the difference is treated as compensation — and is taxable to the employee immediately (at exercise), rather than at the preferential long-term capital gains rate when the employee eventually sells the shares.

This is the "phantom income" problem that destroyed thousands of startup employees in the dot-com crash: they exercised options when the stock was worth $50/share (with a $1 exercise price), paid ordinary income tax on the $49 spread — but then the company collapsed and the shares were worth nothing. The IRS wanted its money regardless.

The 409A valuation exists to protect both the company and its employees. By obtaining an independent, contemporaneous appraisal of the common stock FMV before setting option exercise prices, the company establishes a defensible "safe harbor" against IRS challenges. If the IRS later audits your option grants and you have a proper 409A from a qualified independent appraiser, the agency will generally accept the valuation as valid. Without one, you have no protection.

When You Are Legally Required to Get a 409A

Technically, the IRS does not explicitly require a formal 409A valuation — it requires that the exercise price reflect "fair market value" as determined by "reasonable valuation methods." In practice, a qualified independent appraisal is the only method that provides safe harbor protection. The IRS looks for three hallmarks of a qualified appraisal: the appraiser is independent, the valuation uses accepted financial methodologies, and the valuation is current.

You are required to obtain a new 409A valuation (or update the existing one) in specific triggering events:

  • Material events — A new funding round (especially a priced round with new investors), a significant change in the company's financial condition or prospects, a major contract win or loss, or a pivot that changes the business model fundamentally. The IRS treats these as events that could materially change the company's value.
  • Time-based updates — Most advisors recommend refreshing the 409A at least every 12 months, even absent a triggering event, to maintain credibility and defensibility.
  • Near a liquidity event — If you are approaching an acquisition or IPO, the IRS and plaintiffs' lawyers will scrutinize whether the 409A was current. Doing a refresh 6–12 months before a liquidity event is strongly advisable.
  • Preceding an option grant — If your last 409A is more than a few months old and you are about to grant new options, refresh it first.

The Core Methodology: How a 409A Appraiser Values Private Company Common Stock

A 409A valuation is fundamentally different from the valuation used to set the price of preferred shares in a funding round. In a financing, preferred shares are valued directly — the VC pays $X per preferred share and that price is transparent. But common stock (what employees hold through options) is different: it is typically worth less than preferred stock because it is illiquid, has no anti-dilution protection, and sits behind preferred shares in a liquidation waterfall. A 409A appraisal must determine the FMV of the common stock, which is almost always less than the preferred share price.

Step 1: Enterprise Value — The OPM Back-Solve Method

The most common method for a funded startup is the Option Pricing Model (OPM), sometimes called the "back-solve" method. Here is how it works:

The 409A appraiser starts with the most recent funding round's price per preferred share as a proxy for the company's total equity value. They then use an option-pricing model (Black-Scholes-Merton or a lattice model) to "back into" the value of the common stock by accounting for:

  • Liquidation preferences — Preferred shareholders get paid first in a sale. If preferred has a 1x non-participating liquidation preference, common shareholders only receive value after preferred is fully redeemed.
  • Anti-dilution rights — Ratchet or weighted-average anti-dilution provisions give preferred shareholders protection against down rounds.
  • Conversion rights — Preferred can convert to common at the option of the holder, so if converting is more valuable, preferred holders will do so.
  • Time to exit — The longer the expected time to an IPO or acquisition, the more the common stock behaves like a long-dated call option on the enterprise.

Under OPM, the common stock is modeled as a call option on the company's enterprise value, with the preferred liquidation preference serving as the strike price. This is why a 409A value of $2.00/share might coexist with a preferred round priced at $5.00/share — the common is out-of-the-money relative to the preferred's liquidation preference and structural protections.

Step 2: Comparable Company Analysis (CCA)

The OPM back-solve is grounded in market evidence through the preferred share price. The appraiser also performs a comparable company analysis to cross-check the result. They identify publicly traded companies in similar industries, sizes, and growth stages, then apply their trading multiples (EV/Revenue, EV/EBITDA, Price/Sales) to the private company's financials to derive an independent enterprise value range. If the OPM-derived enterprise value is inconsistent with the CCA, the appraiser will reconcile and explain the divergence.

Step 3: Discounted Cash Flow (DCF)

Many 409A appraisals also include a DCF analysis, projecting the company's free cash flows over a 5–10 year horizon and discounting at an appropriate WACC (weighted average cost of capital). The terminal value is derived using an appropriate exit multiple or Gordon Growth Model. A DCF is especially important for companies without recent funding rounds (bootstrapped or bridge-financed companies) where there is no preferred share price to back-solve from.

Step 4: Applying a DLOM — The Key Adjustment for Illiquidity

Even after the OPM and CCA converge on an enterprise value, the 409A appraisal applies a Discount for Lack of Marketability (DLOM) to arrive at the common stock FMV. This discount recognizes that private company shares cannot be freely sold or hedged, unlike publicly traded shares. The DLOM typically ranges from 20% to 50% for early-stage companies, varying based on:

  • Expected time to liquidity (longer time = higher DLOM)
  • Investor rights and transfer restrictions
  • Company-specific risk factors (customer concentration, key person dependency)
  • Market conditions for comparable private company exits

Studies of restricted stock transactions and pre-IPO placements have empirically validated DLOM ranges. The IRS has historically accepted DLOMs in the 30–35% range for early-stage companies; for more mature private companies with shorter expected exit timelines, a lower DLOM may be appropriate.

Why the 409A Is Different from Your Preferred Share Price

Founders are sometimes confused when the 409A comes back lower than their last round's preferred share price. This is not an error — it is working as intended. The preferred share price in a funding round embeds investor protections (liquidation preferences, anti-dilution, board seats, information rights) that make it worth more than common stock. The 409A values the common stock that your employees actually hold.

For example:

  • Series A round: $5.00 per preferred share (paid by VC)
  • 409A valuation (common stock): $1.80 per share
  • New employee option grant: exercise price = $1.80 (set at 409A FMV)

If the company later sells for $10/share, the employee exercises options at $1.80 and captures $8.20/share in value — the difference between what they paid and the exit price. The 409A established that $1.80 was a legitimate, arm's-length FMV, so the $8.20 spread is taxed as long-term capital gain (assuming the employee holds the shares more than one year after exercise), not as ordinary income at exercise.

The Tax Implications: Ordinary Income vs. Capital Gains

Getting the 409A right is the difference between your employees paying ordinary income tax (up to 37% federal + state) on the option spread versus paying long-term capital gains tax (currently 20% federal + state) on the appreciation. This is not a minor difference — on a $1 million option gain, the tax differential can exceed $100,000.

If the 409A is Done Correctly (Exercise Price ≥ FMV at Grant)

For non-qualified stock options (NQSOs): the employee pays ordinary income tax on the option spread at exercise — not at grant. The company's deduction mirrors this. If the employee holds the shares after exercise and sells later at a gain, only the post-exercise appreciation is a capital gain.

For incentive stock options (ISOs): there is no regular income tax at exercise (though the spread creates an AMT preference item). The entire gain is taxed as long-term capital gain at sale, provided holding period requirements are met (2 years from grant, 1 year from exercise).

If the 409A is Too Low (Exercise Price < FMV at Grant)

The IRS can recharacterize the options as having been granted at fair market value, and the employee owes ordinary income tax on the option spread immediately at grant — even before any value is realized. This triggers a massive tax liability for employees who may not be able to sell shares to pay the tax bill (a common "affordability" problem in the dot-com era). The company also loses its deduction.

Section 83(b) Election: The Timing Trap for RSUs

For Restricted Stock (not RSUs, but actual shares with transfer restrictions), employees can file a Section 83(b) election within 30 days of grant to pay tax on the restricted shares at the grant date FMV rather than at vesting. If the shares appreciate significantly before vesting, an 83(b) election can convert what would have been ordinary income at vesting into a lower-taxed capital gain base. However, 83(b) elections are only available for actual share grants, not for stock options or RSUs — a common misconception that trips up founders and employees.

Who Can Perform a 409A Valuation?

The IRS requires that a qualified 409A valuation be performed by someone with "sufficient knowledge, experience, and expertise" — typically a CPA, CFA, or a qualified valuation firm specializing in early-stage companies. The appraiser must be independent: they cannot be the company itself, a company insider, or someone with a financial interest in the outcome.

For VC-backed companies, it is standard practice to commission a 409A from a specialized valuation firm (e.g., Carta, Forge Global, or an independent boutique like Equity methods). Some law firms also offer 409A services. The cost typically ranges from $3,000–$15,000 depending on company complexity, the number of funding rounds, and the depth of analysis required. For a Series B or later company with multiple rounds and complex cap tables, expect to pay on the higher end.

How the 409A Integrates with Your Equity Compensation Program

The 409A value flows directly into your equity compensation administration:

Setting Option Grant Exercise Prices

Every new hire option grant must have its exercise price set at or above the current 409A FMV. If you grant options at a lower price, you create immediate 409A violation risk and potential penalty taxes for employees. Many companies set the exercise price equal to the 409A value as a matter of policy, while others set it at the preferred share price (which is always ≥ 409A common stock FMV) to give employees a higher effective strike price with more potential upside — but this also means employees pay more to exercise.

Annual Option Pool Refresh

After a new funding round closes, it is standard to refresh the 409A (because the preferred share price just changed) and then refresh option grants for existing employees to reflect the updated FMV. Many option plans include a provision for "reload" or "refresh" grants to existing employees after a new financing. Each refresh grant requires its own 409A-aligned exercise price.

409A and Board Approval

The 409A report is presented to the board of directors for approval. The board formally acknowledges the appraisal and sets the exercise price for new option grants by reference to the 409A. This creates a contemporaneous written record that protects the company if the IRS later questions any option exercise price.

The Cap Table Connection

The 409A also feeds directly into your cap table. The 409A value per share of common stock is the number used in many financial models to compute the "fair value" of the entire equity compensation program for disclosure purposes (e.g., in financial statements under ASC 718 or IFRS 2). This affects:

  • Board reporting — Understanding the fully diluted share count and aggregate option value at 409A FMV
  • 409A expense tracking — Computing the total stock-based compensation expense for the period
  • Investor reporting — Pro forma cap tables often show 409A value per share alongside nominal per-share price

When modeling dilution in future funding rounds, you will use the 409A value as the baseline common stock value, not the preferred share price, because preferred shares are only issued in financing events — employees always hold common.

Common 409A Mistakes That Create Tax Risk

Mistake 1: Using the Preferred Share Price as the Exercise Price

While this is conservative from a tax perspective (higher exercise price = less spread = less potential ordinary income), it can also be seen as overcompensating employees relative to actual common stock value, which may attract IRS scrutiny or create shareholder litigation. The right approach is to use the 409A common stock FMV, which is always defensible.

Mistake 2: Not Updating After a Funding Round

If your Series A closed at $5.00 per preferred share in January and you did not refresh the 409A before granting options in March, you may be using a stale valuation that does not reflect the new market evidence from the round. The IRS can argue the options granted in March should have used a higher exercise price reflecting the Series A transaction. Always refresh the 409A before issuing new grants after a priced round.

Mistake 3: Granting Backdated Options

Backdating option grant dates to a period when the stock was worth less — and therefore the exercise price would be lower — was a prevalent scandal in the 2000s. It is illegal under both securities law and tax law. All option grants must have contemporaneous exercise prices reflecting the FMV at the actual grant date. Never backdate options.

Mistake 4: Ignoring DLOM for Pre-Revenue Companies

Some early-stage companies with no funding round try to do an internal "409A" using a DCF alone without applying a DLOM. Without a market check (preferred share price or comparable transaction), the IRS will expect a higher DLOM to account for the lack of marketability. An underpriced 409A creates the same problem as any other underpriced option: employees face unexpected tax exposure.

Summary: Key Takeaways for Founders and CFOs

  • The 409A valuation establishes the defensible fair market value of your company's common stock for IRS purposes.
  • Exercise prices set at or above the 409A FMV protect employees from immediate ordinary income tax at grant under Section 409A.
  • Get a new 409A after any material event (new funding round, significant business change) and at least every 12 months.
  • The 409A common stock value is almost always lower than your preferred share price because common stock lacks preferred's liquidation and anti-dilution protections.
  • The OPM back-solve method uses your preferred share price as a starting point and applies a DLOM to derive common stock FMV.
  • Use a qualified independent appraiser — the cost of a proper 409A is trivial compared to the cost of an IRS audit or an employee class action.
  • Sync your option grants to your 409A: no new grants should be issued without a current 409A establishing the exercise price.

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Author

Amy is a CPA with 14 years of experience.