The 83(b) Election: A Founder's 30-Day Guide (2026)

If you have restricted stock in a startup, the 83(b) election is the highest-leverage 30-minute task you will ever do — and the deadline is the most unforgiving in startup tax. File within 30 days of your grant and you can lock in a near-zero tax bill and start your capital-gains clock. Miss it, and there is no fix.

What the election does

By default (IRC §83(a)), when you hold stock that's still subject to vesting, you're taxed as it vests — ordinary income on the spread between the stock's fair market value at each vesting date and what you paid. If the company grows, each vesting tranche is taxed at a higher and higher value.

An 83(b) election flips that. You elect to be taxed now, at grant, on the spread between today's FMV and your purchase price. For a founder who buys restricted stock at FMV at incorporation, that spread is typically ~$0 — so you pay little or nothing today, and all future appreciation is taxed later as capital gain, not ordinary income.

It also starts two clocks at the grant date: the long-term capital-gains holding period and the QSBS (§1202) five-year clock. Both matter enormously at exit.

The 30-day deadline

This is the part to get right. The election must be filed no later than 30 days after the grant/transfer date. The grant date is day 0, so:

Deadline = grant date + 30 calendar days.

It counts weekends and holidays. If day 30 itself falls on a Saturday, Sunday, or legal holiday, §7503 rolls the deadline to the next business day — but treat that as a safety net you never touch. There are no extensions, no reasonable-cause relief, and no late filing. Miss the window and the election is permanently unavailable.

Check your date:

Who it applies to (and who it doesn't)

Applies to:

• Founders with restricted stock subject to vesting or a repurchase right.
• Early employees with restricted stock awards (RSAs).
• Early-exercised options — you exercise before vesting, so you hold unvested stock subject to forfeiture.

Does not apply to:

• Plain RSUs — restricted stock units are an unfunded promise, not transferred property under §83. Filing an 83(b) for RSUs is a common and ineffective mistake.
• Standard (non-early-exercised) options — there's no property transfer until you exercise, so the election is generally moot until then.

Why founders almost always file

The math is lopsided. At incorporation a founder buys, say, 7,000,000 shares at a $0.0001 FMV — a spread of essentially zero, so filing 83(b) costs ~$0 in tax today. Skip the election, and as the company raises and grows, each vesting tranche is ordinary income at the then-current FMV. On a company that goes from a penny to dollars per share, that default treatment can produce a brutal, recurring tax bill on paper gains you can't sell.

Filing also means that, years later, the entire gain is long-term capital gain (and potentially QSBS-excluded) measured from the grant date — not ordinary income measured from vesting.

The one real downside

If you pay tax at grant and then forfeit the unvested shares — you leave before vesting, or the company fails and the stock is worthless — the tax you paid is generally not recoverable. There's no deduction for the forfeiture, and any loss is capped at what you actually paid. For a founder buying at ~$0 FMV this risk is negligible. For someone paying real money for a higher-FMV grant, weigh it.

How to file (2026 mechanics)

1. Form 15620 or a letter. The IRS released Form 15620 — its first standardized 83(b) form — in November 2024. As of mid-2025 you can file it electronically through the IRS website using an ID.me login, or download and mail it. The older self-drafted election letter (Rev. Proc. 2012-29 language) is still valid. Use only one method.
2. Where (if mailing): the IRS service center where you file your federal income tax return. Use USPS Certified or Registered Mail and keep the receipt — under §7502 the postmark date controls timeliness. E-filing gives you an instant confirmation instead.
3. Send a copy to your company. You're required to furnish a copy to the issuer.
4. You do NOT attach it to your tax return. That requirement ended for grants on or after January 1, 2016 (you still report any income).
5. Community-property states: a spouse signature isn't strictly required but is advisable to bind the spouse's community interest.

Common mistakes

• Missing the 30-day window. No exceptions. File early — don't engineer it down to the last day.
• Filing for RSUs. Ineffective; 83(b) only applies to transferred property (RSAs, founder stock, early-exercised options).
• Forgetting the company copy or losing your proof of timely filing.
• Not paying tax actually due. If there's a positive spread at grant, the election doesn't waive the resulting ordinary-income tax for that year.
• Ignoring state rules. Most states conform, but treatment and any state-level election or withholding vary.

Bottom line

For nearly every founder and early employee with restricted stock, filing an 83(b) is the right move — and the only hard part is the calendar. The day your stock is granted, put the deadline (grant + 30 days) on your calendar with a buffer, file early via Form 15620 or a letter, keep your proof, and send a copy to the company. Then confirm the details with your CPA — but don't wait for that conversation to start the clock.

This guide is informational only and is not legal or tax advice. The 30-day deadline is strict and unforgiving; confirm the decision and filing with a CPA or attorney. Sources: 26 USC §83(b) · 26 CFR §1.83-2 · 26 USC §7503 · IRS Form 15620 (released Nov 2024; e-filing added mid-2025). Reviewed by a licensed CPA on the Acorn 9 team.