Fair Market Value

What Is Fair Market Value?

Fair market value (FMV) is the price at which a company's stock would trade between a willing buyer and a willing seller, neither being under any compulsion to buy or sell, and both having reasonable knowledge of all relevant facts. For public companies, FMV is simply the current stock price on the open market. For private companies, FMV must be determined through an independent appraisal, typically a 409A valuation. FMV is a foundational concept in stock option compensation because it determines exercise prices, tax obligations, and the economic value of your equity.

How Fair Market Value Is Determined

Public Companies

For publicly traded companies, FMV is straightforward — it is the stock's trading price on a given date. The IRS generally accepts the closing price on the relevant date or an average of the high and low prices for that day.

Private Companies

For private companies, FMV is more complex. Because there is no public market for the shares, the value must be estimated. This is done through a 409A valuation, which considers factors such as:

• Financial metrics — Revenue, earnings, cash flow, and growth rates.
• Comparable companies — Valuations of similar public and private companies.
• Recent transactions — The price at which the company's stock has recently changed hands, including funding rounds.
• Discounts — Adjustments for lack of marketability (you cannot easily sell private stock) and minority interest (common stockholders have limited control).

The Common vs. Preferred Stock Gap

An important nuance for startup employees is that FMV for option pricing purposes refers to the value of common stock, not preferred stock. Preferred stock — held by venture capital investors — comes with additional rights like liquidation preferences and anti-dilution protections. Common stock lacks these protections, so its FMV is lower, often significantly so. This is why your exercise price may seem low relative to the company's headline valuation.

Practical Implications for Startup Employees

FMV at Grant vs. FMV at Exercise

Two FMV data points matter most to you. The FMV at the time of your grant determines your exercise price. The FMV at the time you exercise determines your bargain element and your tax consequences. As the company grows, the gap between these two values widens, increasing both your potential upside and your tax exposure.

FMV and Tax Calculations

The FMV at the time of exercise is used to calculate the bargain element, which is the basis for your tax liability. For non-qualified stock options, the bargain element is taxed as ordinary income. For incentive stock options, it is an AMT preference item. In both cases, a higher FMV at exercise means a larger tax bill.

FMV Changes Over Time

Private company FMV is not static. It is updated periodically through new 409A valuations, typically annually or after material events like funding rounds. A rising FMV over time is a sign that the company is growing in value — which is good for your equity but increases the cost and tax implications of exercising options.

Knowing Your Current FMV

You have the right to know the current FMV of your company's common stock. Ask your employer or equity plan administrator for the most recent 409A valuation. This number is essential for modeling your exercise costs and tax obligations. Without it, you are making exercise decisions in the dark.

How It Relates to Exercising Stock Options

Fair market value is the metric that ties together every aspect of option exercise decision-making. It sets your exercise price at grant, determines your tax liability at exercise, and defines your gain or loss at sale. Monitoring how FMV evolves over time helps you choose the optimal moment to exercise, manage your tax exposure, and maximize the value of your equity compensation. Always know your FMV before making any exercise decisions.