Who actually needs to think about this?

Anyone receiving restricted stock (common for founders and very early employees) or exercising stock options early, before they've vested — both create property subject to a substantial risk of forfeiture, which is what makes an 83(b) election relevant. It generally doesn't apply to RSUs (restricted stock units), which aren't actual property until they vest, or to a normal option exercise after vesting has already occurred.

What exactly is the deadline, and does it ever get extended?

30 calendar days from the grant date — not from when you receive paperwork or a stock certificate, and not 30 business days. If day 30 falls on a weekend or federal holiday, it moves to the next business day. The Tax Court has heard and rejected late-filing arguments involving illness, attorney error, and mail problems. Treat it as a hard stop with no path to an extension.

How do I actually file it?

Mail a written statement satisfying Treasury Regulation §1.83-2 — or the newer, optional standardized Form 15620 — to the IRS service center where you file your return, ideally by certified mail with return receipt so you have proof of the postmark date. Give a copy to your employer, and attach a copy to your federal income tax return for the year of the grant. There's no way to file it electronically.

What happens if I don't file and the stock is worth a lot more at vesting?

You're taxed on the spread between what you paid and the fair market value at each vesting date, as ordinary income, at whatever the stock is worth on that date — not the grant-date value. At a fast-growing company, the difference between grant-date FMV and later vesting-date FMV can be enormous, and each vesting tranche is its own separate taxable event.

What's the actual risk of filing?

You pay real tax now, based on today's spread, on stock you don't fully own yet — it's still subject to vesting and forfeiture. If you leave before it vests or the company fails, those unvested shares are typically forfeited back to the company, and the tax you already paid on them generally isn't simply refunded. There are narrow loss-deduction possibilities in some cases, but they don't make you whole. Filing is a bet that the company survives and you stay long enough to vest — not a risk-free move.

Equity compensation

The 83(b) Election: What It Is, the 30-Day Deadline, and When It's Worth It

One form, filed within 30 days of a grant with zero exceptions, that decides whether you're taxed on a near-zero valuation now or on whatever the stock is worth at each future vesting date. The upside can be enormous. So can the downside if the company doesn't work out.

7 min read · Published August 2026

Key Takeaways

An 83(b) election lets you choose to be taxed on restricted stock or early-exercised options at grant — based on today's value — instead of at each future vesting date.
The deadline is 30 calendar days from the grant date, postmarked, with no extensions. The Tax Court has rejected every late-filing excuse it has heard.
Filing requires mailing a written statement (or the newer Form 15620) to the IRS, giving a copy to your employer, and attaching a copy to that year's tax return — there's no e-filing option.
The upside is locking in tax on a low or near-zero spread instead of a potentially much higher one at vesting, and starting the capital-gains holding-period clock early.
The real risk: you pay real tax now on stock you don't yet fully own, and if you leave or the company fails before it vests, that tax generally isn't simply refunded.

The choice: tax now on a small number, or tax later on an unknown one

When you receive restricted stock, or exercise stock options before they’ve vested, the default rule taxes you as each portion vests — at whatever the stock is worth on that date. An 83(b) election lets you opt out of that default and instead be taxed once, up front, on the spread at grant. At an early-stage company where the purchase price and the grant-date FMV are close together, that spread — and the tax on it — can be close to zero.

File it, and you’re betting the company is worth more later. Skip it, and the IRS bets with you — at whatever price the stock happens to hit each vesting date.

100,000 shares, $0.01 purchase price, early-stage grant

FMV at grant (filed 83(b))$0.01/share

Taxable spread if filed$0 — tax due now: $0

Projected FMV at full vest (no election)$2.00/share

Taxable spread if not filed$199,000 — ordinary income at vesting

At a 40% combined rate, that's the difference between owing nothing now and owing roughly $79,600 in ordinary income tax spread across future vesting dates — for the exact same shares.

The 30-day deadline has no exceptions

The election must be postmarked within 30 calendar days of the grant date — the date the board approved the grant, not the date you received paperwork or a stock certificate. Courts have consistently refused to grant relief for missed deadlines, including cases involving illness, an attorney’s error, and problems with certified mail. There is no extension process. If day 30 lands on a weekend or federal holiday, the deadline moves to the next business day — that’s the only flexibility built in.

How to actually file it

Prepare a written statement meeting Treasury Regulation §1.83-2, or use the IRS’s newer standardized Form 15620 (voluntary, but simpler than drafting your own letter).
Mail the original to the IRS service center for your tax return — by certified mail with return receipt requested, so you can prove the postmark date if it’s ever questioned.
Give a copy to your employer.
Attach a copy to your federal income tax return for the year of the grant.

Certified mail is how you prove you made the deadline

Under IRC §7502, a document is treated as filed on its postmark date, not the date the IRS actually opens it — but you need to be able to prove that postmark date if it’s ever questioned years later. Certified mail with return receipt is the standard way employees document this, since the IRS doesn’t accept 83(b) elections electronically at all.

The downside nobody mentions on the way in

Filing isn’t free money — it’s a real tax payment on stock you don’t yet fully own. If you leave the company before the shares vest, or the company doesn’t survive, those unvested shares are typically forfeited back, and the tax you already paid on the election generally isn’t simply refunded. Filing an 83(b) election is a bet that you’ll stay long enough to vest and that the company will still have value when you do — worth making deliberately, not automatically just because it’s the default advice for early-stage grants.

Run your own numbers

See the tax difference between filing and not filing at your grant’s actual numbers.

Calculate the impact

You might also read

Equity compensation

NSO vs. ISO: What's Actually Different (and Why Most People Don't Know Which They Have)

Same-looking grant, same vesting schedule, completely different tax treatment. The difference between a non-qualified stock option and an incentive stock option comes down to one word — qualified — and it changes when you owe tax, how much withholding hits, and whether AMT enters the picture at all.

Equity compensation

Concentrated Stock Positions: Five Strategies for the Exec Sitting on a Large Holding

Selling triggers full capital gains. Holding means concentration risk. There are five strategies in between — each with different tax, liquidity, and coordination requirements.

Equity compensation

The RSU & Stock Option Tax Coordination Guide

Coordinate RSU vesting, ISO/AMT exposure, and concentrated positions so your CPA and advisor are working from the same picture.

Sources & References

Frequently asked

Questions owners actually ask

Who actually needs to think about this?: Anyone receiving restricted stock (common for founders and very early employees) or exercising stock options early, before they've vested — both create property subject to a substantial risk of forfeiture, which is what makes an 83(b) election relevant. It generally doesn't apply to RSUs (restricted stock units), which aren't actual property until they vest, or to a normal option exercise after vesting has already occurred.
What exactly is the deadline, and does it ever get extended?: 30 calendar days from the grant date — not from when you receive paperwork or a stock certificate, and not 30 business days. If day 30 falls on a weekend or federal holiday, it moves to the next business day. The Tax Court has heard and rejected late-filing arguments involving illness, attorney error, and mail problems. Treat it as a hard stop with no path to an extension.
How do I actually file it?: Mail a written statement satisfying Treasury Regulation §1.83-2 — or the newer, optional standardized Form 15620 — to the IRS service center where you file your return, ideally by certified mail with return receipt so you have proof of the postmark date. Give a copy to your employer, and attach a copy to your federal income tax return for the year of the grant. There's no way to file it electronically.
What happens if I don't file and the stock is worth a lot more at vesting?: You're taxed on the spread between what you paid and the fair market value at each vesting date, as ordinary income, at whatever the stock is worth on that date — not the grant-date value. At a fast-growing company, the difference between grant-date FMV and later vesting-date FMV can be enormous, and each vesting tranche is its own separate taxable event.
What's the actual risk of filing?: You pay real tax now, based on today's spread, on stock you don't fully own yet — it's still subject to vesting and forfeiture. If you leave before it vests or the company fails, those unvested shares are typically forfeited back to the company, and the tax you already paid on them generally isn't simply refunded. There are narrow loss-deduction possibilities in some cases, but they don't make you whole. Filing is a bet that the company survives and you stay long enough to vest — not a risk-free move.

Take the next step

52 calculators and 131 articles to keep going with.

Browse tools Browse articles

Educational content only. This article is for informational purposes and does not constitute tax, legal, or financial advice. Every situation is different — consult a qualified professional before acting on anything here.