The 83(b) Election Deadline: What Happens When You Miss the 30-Day Window

The election must be filed no later than 30 days after the date the property was transferred to you (IRC §83(b)(2); Treas. Reg. §1.83-2(b)). Because the deadline is set by statute, the IRS's usual late-election relief under Treas. Reg. §301.9100-3 is not available, and there is no reasonable-cause exception.

The one built-in cushion is the weekend rule. The Form 15620 instructions confirm that under IRC §7503, if day 30 falls on a Saturday, Sunday or legal holiday, an election postmarked on the next business day is timely. For paper filings, the postmark date is the filing date under IRC §7502, which is why certified mail matters. If you file online, the IRS confirmation shows the submission date.

Count from the transfer date, usually the day you sign the stock purchase agreement and pay for the shares. Not the incorporation date, and not the board approval date.

Count 30 calendar days starting the day after the transfer, and the election must be filed (postmarked or submitted online) by day 30. Weekends count inside the window; only the final day rolls forward if it lands on a weekend or legal holiday.

• Shares purchased Tuesday, March 3, 2026: day 30 is Thursday, April 2, 2026. File by then.
• Shares purchased Friday, January 2, 2026: day 30 is Sunday, February 1, 2026, so an election postmarked or submitted Monday, February 2 is timely under IRC §7503.

The election may also be filed before the transfer under Treas. Reg. §1.83-2(b), once the terms are fixed. We prefer filing the same day the stock purchase agreement is signed and paid, so there is nothing to count.

Without the 83(b) election, you are subject to the default rules of Section 83(a). You recognize ordinary income as each tranche of restricted stock vests, based on the fair market value at the time of vesting minus the amount you paid. For a founder who purchases shares at $0.001 during incorporation, the tax exposure grows with every milestone. After a seed round that values shares at $0.25, a cliff vest of 250,000 shares generates $62,250 in ordinary income. After a Series A at $1.50 per share, monthly vesting creates ongoing ordinary income at a rate that can exceed your actual cash compensation. You owe tax on value you cannot access because the shares are illiquid.

You cannot file a late 83(b). What you can sometimes change is the equity itself, with the board's cooperation and a lawyer's help:

• Rescind and redo in the same tax year. If the problem is caught quickly, the company and founder can unwind the original purchase and start over with a new agreement and a new 30-day window. Rescission is generally respected only if completed within the same tax year (Rev. Rul. 80-58).
• Cancel and reissue. The company repurchases the unvested shares at cost and issues new restricted shares, and you file an 83(b) on time for the new grant. If the stock is now worth more than you pay, the difference is income.
• Remove the vesting. If the shares are still worth close to what you paid, the board can accelerate vesting so the shares are no longer subject to forfeiture. You recognize income now, at today's low value, instead of at each future vesting date. Investors may later ask for vesting to be reimposed, which raises the same question again.

Each of these works best while the company's value has barely moved. Every month of delay makes the fix more expensive.

Once filed, an 83(b) election can be revoked only with IRS consent, and Rev. Proc. 2006-31 sets a narrow test. Consent is generally granted if you request it before the 30-day filing deadline has passed. After that, revocation requires a mistake of fact about the underlying transaction, requested within 60 days of discovering it. Misunderstanding the vesting terms or the tax result does not count, and neither does a fall in the stock's value.

That matters because an election can cost money if things go badly. If you leave and forfeit unvested shares after filing, Treas. Reg. §1.83-2(a) treats the forfeiture as a sale with a loss equal only to what you paid minus what you get back. Income you reported at the election is not deductible.

Example (hypothetical): an employee buys 40,000 restricted shares at $0.05 ($2,000) when they are worth $0.30 and files an 83(b), reporting $10,000 of ordinary income. If they leave before the one-year cliff and the company repurchases all the shares at cost, there is no loss on the $2,000 they get back, and the $10,000 of income stays taxed. For founders buying at true fair market value, the downside is just the price paid.

Act within days, because every fix gets more expensive as the stock's value rises.

1. Confirm the actual transfer date from the signed stock purchase agreement and payment record, and recount. Some founders discover they are still inside the window.
2. Search for proof of filing: an IRS online confirmation, a certified mail receipt or a copy given to the company. If you filed but lost proof, ask the company for its copy before assuming the worst.
3. Tell the company's lawyer and board. Rescission, cancel-and-reissue and vesting removal all need corporate action.
4. Get a current value for the shares, ideally from the latest 409A valuation, so you know the cost of each option.
5. If nothing can be fixed, plan for the income: as an employee, each vesting tranche is wages subject to withholding, so budget for the cash.

The numbers show why speed matters. A 250,000-share cliff that vests at $0.25 creates $62,250 of income; the same cliff vesting at $1.50 after a Series A would create about $374,750.

Treat the 83(b) election as part of your incorporation workflow, not a follow-up task. When we handle formation, the 83(b) election is prepared at the same time as the stock purchase agreement and signed in the same sitting, then filed right away. It should be part of the closing, not a to-do item.

If you are doing it yourself, file the day you sign. The fastest route is IRS Form 15620 online through the IRS website after an ID.me sign-in, which gives an immediate confirmation. Set up ID.me before signing, since first-time identity checks can take a while. The paper route is a signed election mailed by USPS Certified Mail to the IRS service center for your state. Use one method, give the company a copy, and keep the proof permanently. You no longer attach a copy to your Form 1040. This is general information, not tax advice for your specific facts.