The Section 83(b) Election: A 30-Day Decision With Long-Term Consequences

Founders and early employees who receive restricted stock or exercise options early face a short window to make one of the most consequential tax elections in startup finance.

When you receive stock that is subject to vesting, the default tax rule is that you recognize ordinary income as each portion vests, measured at the fair market value on the vesting date. For a startup whose value is rising rapidly, that can mean a growing tax bill each year on shares you cannot sell. The Section 83(b) election allows you to instead recognize income at the time of grant or early exercise, based on the value at that time, and to start the capital gains holding period immediately. (See 26 U.S.C. § 83(a)–(b) and Treas. Reg. § 1.83-2; the IRS also illustrates the election with worked examples in Rev. Proc. 2012-29.)

Why the election matters

Consider a founder who receives 1,000,000 shares of restricted stock when the company is worth a fraction of a cent per share. With a timely 83(b) election, the income recognized at grant is negligible. All future appreciation is then eligible for capital gains treatment when the shares are eventually sold, and the holding period for both long-term capital gains and the qualified small business stock exclusion starts at grant.

Without the election, each vesting tranche generates ordinary income at whatever the shares are worth at that time, potentially at a much higher valuation after later funding rounds, with no ability to sell shares to cover the tax.

The same logic applies to employees who early-exercise stock options. Many Bay Area startups permit early exercise of unvested options; the resulting shares are restricted stock, and an 83(b) election is generally needed to avoid income recognition as the shares vest.

The 30-day rule is unforgiving

The election must be filed within 30 days of the date the property is transferred to you. There are no extensions and no late-filing relief. Treas. Reg. § 1.83-2(b) requires the election to be filed no later than 30 days after the date of transfer, and once made it may not be revoked without the consent of the IRS Commissioner (Treas. Reg. § 1.83-2(f)). The IRS introduced a standardized form for the election, Form 15620, in late 2024. In 2025 the IRS began accepting the form electronically through an online portal with identity verification, as described in Mintz's summary of the electronic filing option. Whether filed online or by mail, you must also provide a copy to the company and keep a copy for your own records.

Sidley Austin has noted some practical quirks with the online tool, including limits on the number of securities per submission and the number of decimal places allowed for per-share values, though later updates expanded those limits. If the online form cannot accurately represent your grant, paper filing remains available. If mailing, use a method that provides proof of the mailing date.

When the election may not make sense

The election is not automatic and not always beneficial. Points to weigh include:

• Cash outlay. If the fair market value at grant exceeds what you paid, you owe tax on the difference now, without any liquidity to fund it.

• Forfeiture risk. If you leave the company before vesting, unvested shares are typically repurchased or forfeited, and the tax paid under the election is not refundable.

• Company outlook. If the company fails, the election has cost you tax on shares that end up worthless, though a capital loss may be available.

• Timing relative to a valuation change. An election filed right before a new 409A valuation or priced round can lock in a lower value; one filed after may not.

Interaction with other rules

An 83(b) election works alongside several other provisions discussed elsewhere in our Insights section. It starts the clock for the QSBS holding period under Section 1202, which was expanded for stock issued after July 4, 2025 by Pub. L. 119-21 (see 26 U.S.C. § 1202). For incentive stock options, an early exercise with an 83(b) election has AMT implications, since the spread at exercise is an AMT adjustment under 26 U.S.C. § 56(b)(3); see IRS Topic 427 for the general treatment.

Final thoughts

The 83(b) election is a small form with a short deadline that can shape the tax character of a life-changing outcome. Because it is irrevocable and the stakes are high, it deserves attention from your tax adviser and, in many cases, the company's counsel before the 30-day window closes. This article is for general education and does not constitute tax or legal advice.

Important Disclosures

Important Disclosures: Propulsion Capital Management is an investment adviser registered with the State of California Department of Financial Protection and Innovation. Registration does not imply a certain level of skill or training. This article is provided for general informational and educational purposes only and does not constitute investment, tax, legal, or accounting advice, nor an offer or solicitation to buy or sell any security or to adopt any particular investment strategy. The information is believed to be accurate as of the date of publication but is subject to change without notice; tax laws and regulations change frequently and their application depends on individual facts and circumstances. Nothing herein should be relied upon as a substitute for personalized advice from a qualified professional. Investing involves risk, including the possible loss of principal, and past performance is no guarantee of future results. Diversification does not ensure a profit or protect against loss. Any examples are hypothetical, are for illustrative purposes only, and do not reflect the experience of any client. Links to third-party websites are provided for convenience; Propulsion Capital Management does not endorse, and is not responsible for, the content of third-party sites. Propulsion Capital Management does not provide tax or legal advice; please consult your tax adviser or attorney regarding your specific situation.