Section 83(b) Election: 30-Day Deadline and Documentation

What IRC § 83 actually says — and what the election overrides

Under IRC § 83(a), when you receive property in connection with the performance of services, you recognize ordinary income in the first year the property is either (1) transferable or (2) no longer subject to a substantial risk of forfeiture — whichever comes first. For startup restricted stock with a 4-year vesting schedule, that means you owe ordinary income tax in each year shares vest, at whatever the FMV is on each vesting date.

The 83(b) election overrides this default. You tell the IRS: “I want to recognize income now, at transfer, even though the stock is still restricted.” You pay ordinary income tax on the difference between what you paid for the shares and their FMV at the time of transfer. At a Series A startup where you early-exercise at the 409A valuation, that spread is often zero or close to it — meaning your ordinary income inclusion is $0 or negligible.

Everything after that — all appreciation from grant-date FMV to eventual sale price — is taxed as capital gains. If you hold for 12+ months, it qualifies for long-term capital gains rates: 0%, 15%, or 20% depending on your taxable income, plus 3.8% NIIT if your MAGI exceeds $200K (single) or $250K (MFJ). Without the election, the same appreciation hits as ordinary income at vesting — up to 37% federal plus FICA on the vesting-date spread.

Who is eligible — and who is not

The 83(b) election applies to restricted property transferred in connection with services. In practice, this means:

The RSU distinction trips up more people than any other part of 83(b). RSUs at public companies like Apple, Google, or Meta are not eligible because no shares exist until vesting settles them into your brokerage account. If your offer letter says “restricted stock units,” you cannot file 83(b). If it says “restricted stock award” or your option agreement allows early exercise of unvested shares, you can.

The 30-day deadline: what “no exceptions” actually means

You have 30 calendar days from the date of the property transfer to file the election with the IRS. Not 30 business days. Not 30 days from when you signed the paperwork. Thirty days from the date the restricted stock was transferred to you (for RSAs) or the date you early-exercised (for options).

The IRS has been consistent on this: there is no late-filing provision, no reasonable-cause exception, and no private letter ruling pathway to fix a missed 83(b) deadline. In Rao v. Commissioner and multiple Tax Court decisions, late filings have been rejected regardless of circumstances. If you mail it on day 31, you have permanently lost the election for those shares.

Practical filing timeline:

• Days 1–3: Complete IRS Form 15620 (or a substantially similar statement). Your company’s equity administrator may provide a pre-filled version.
• Days 3–7: Mail to the IRS via certified mail with return receipt (USPS Form 3800). The return receipt is your proof of timely filing — without it, you have no defense if the IRS claims they never received it.
• Same day you mail: Provide a copy to your employer’s stock plan administrator.
• At tax filing: Attach a copy to your federal return for the year of transfer.

Do not wait until week 3 or 4. Postal delays, address errors, and equity-platform processing lags have caused founders to miss this deadline by days. The cost of filing on day 5 instead of day 25 is zero. The cost of missing day 30 by one day can be six or seven figures.

Worked example: early-exercise at a Series A startup

Marcus is an early engineer at a Series A startup in Austin. He receives 100,000 shares of restricted stock (early-exercised ISOs) at $0.10/share (the current 409A FMV). His strike price is $0.10 — so the bargain element at exercise is $0.00. The shares vest over 4 years with a 1-year cliff.

With 83(b) election (filed on day 5)

• Ordinary income at exercise: FMV ($0.10) − strike ($0.10) = $0.00 per share
• Tax owed at exercise: $0
• Holding period starts: day of exercise (for both LTCG 12-month clock and QSBS 5-year clock under § 1202)

Fast forward 4 years: the company reaches Series D, 409A FMV is now $10.00/share. Marcus sells all 100,000 shares in a tender offer at $10/share.

• Sale proceeds: 100,000 × $10 = $1,000,000
• Basis: 100,000 × $0.10 = $10,000
• Gain: $990,000 — all long-term capital gains (held 4 years, well past 12-month threshold)
• Federal LTCG at 20% (income above $533,400 single): $990,000 × 20% = $198,000
• NIIT at 3.8%: $990,000 × 3.8% = $37,620
• Texas state: $0
• Total tax: ~$235,620
• Net proceeds: ~$754,380

If the company qualifies for QSBS under § 1202 (domestic C-corp, gross assets under $50M at issuance, held 5+ years from exercise), the first $10M of gain is excluded from federal tax entirely. Marcus’s $990,000 gain would be 100% excluded — federal tax drops to $0. Note: 7 states including California do not conform to § 1202, so state tax may still apply.

Without 83(b) election

Same facts, but Marcus did not file 83(b). Under the default IRC § 83(a) rule, he recognizes ordinary income as shares vest at their FMV on each vesting date.

• Year 1 cliff vest (25,000 shares at $1.50 FMV): ordinary income = 25,000 × ($1.50 − $0.10) = $35,000
• Year 2 vest (25,000 shares at $4.00 FMV): ordinary income = 25,000 × ($4.00 − $0.10) = $97,500
• Year 3 vest (25,000 shares at $7.00 FMV): ordinary income = 25,000 × ($7.00 − $0.10) = $172,500
• Year 4 vest (25,000 shares at $10.00 FMV): ordinary income = 25,000 × ($10.00 − $0.10) = $247,500
• Total ordinary income across 4 years: $552,500
• At a blended 32–35% federal bracket (salary + vesting income pushes him into higher brackets): ~$180,000–$193,000 in federal ordinary income tax
• Plus FICA (Medicare HI 1.45% + Additional Medicare 0.9% on income above $200K): ~$8,000–$12,000

And when he sells in the tender offer, his basis is the vest-date FMV (not the $0.10 exercise price). If he sells immediately at vest-date prices, there is no additional capital gain. But he has already paid $190,000+ in ordinary income tax over 4 years instead of deferring all gain to a single capital-gains event.

The difference: $190,000+ in ordinary income tax vs. ~$235,000 in LTCG (or $0 with QSBS)

Without 83(b), Marcus pays $190,000+ in ordinary income tax spread across 4 years, with no cash liquidity to pay those bills until a tender offer or IPO. With 83(b), he pays $0 at exercise and $235,620 in LTCG when he actually has cash — or $0 if QSBS applies. The 83(b) election converted $552,500 of ordinary income into $990,000 of long-term capital gains taxed at lower rates. That conversion is the entire point.

The forfeiture risk: the part most people underweight

Here is the trade-off. If Marcus files 83(b), pays $0 at exercise (because strike = FMV), but then leaves the company after 6 months (before the 1-year cliff), the unvested 75,000 shares are forfeited back to the company. Under IRC § 83(b)(1), no deduction is allowed for the forfeiture. He loses the shares and gets nothing back.

In Marcus’s case, the tax at exercise was $0, so the financial loss from forfeiture is limited to the $10,000 he paid to exercise ($0.10 × 100,000 shares). He gets back $2,500 for the 25,000 shares that had not yet cliff-vested if the company has a repurchase right at cost (standard in most early-exercise agreements). Net out-of-pocket loss: $7,500 in exercise cost on forfeited shares.

The risk is more meaningful in two scenarios:

• Exercise at a higher FMV: if you join at Series B and early-exercise at $2.00/share, you are paying $200,000 in exercise capital. Forfeiture means losing $150,000 (the unvested 75%) with no tax deduction for the loss.
• Positive spread at exercise: if the 409A FMV at exercise is $0.50 but your strike is $0.10, you file 83(b) and owe ordinary income tax on $0.40 × 100,000 = $40,000 of income. If you then forfeit, the tax you paid is gone — no refund, no deduction.

The calculation: weigh the probability of forfeiture (how likely are you to leave before full vest?) against the tax savings if the stock appreciates. At a pre-seed or Series A company where the 409A value is pennies, the downside of 83(b) is minimal — you are risking cents per share. At a later-stage company with a $5+ FMV and a meaningful exercise spread, the forfeiture risk deserves more scrutiny.

How to file: IRS Form 15620 step by step

Since 2024, the IRS has published Form 15620 as the standard 83(b) election form. Before 2024, filers used a self-drafted letter matching the regulatory requirements in Treasury Regulation § 1.83-2(e). Either format is still accepted, but Form 15620 reduces the risk of omitting a required element.

Required information on the election:

1. Your name, address, and taxpayer identification number (SSN)
2. Description of the property (e.g., “100,000 shares of common stock of [Company Name], a Delaware corporation”)
3. Date of transfer (the exercise or grant date)
4. Taxable year for which the election is made
5. Nature of the restriction (e.g., “4-year vesting with 1-year cliff; unvested shares subject to company repurchase right at original cost”)
6. FMV of the property at transfer date
7. Amount paid for the property (exercise price)
8. Statement that copies have been provided to the employer

Filing logistics

• Where to mail: the IRS Service Center where you file your annual return (for most taxpayers, this is the Austin, TX or Kansas City, MO campus — check IRS Where to File)
• How to mail: USPS Certified Mail with Return Receipt (Form 3800) is the gold standard. Keep the green card when it comes back — that is your proof of delivery.
• Employer copy: provide a copy to your company’s equity plan administrator on the same day you mail to the IRS.
• Tax return copy: attach a copy to your Form 1040 for the year of the transfer.
• Personal records: keep copies of the election, proof of mailing, employer acknowledgment, and your stock purchase agreement indefinitely. You will need them when you eventually sell.

Interaction with ISO holding periods (IRC § 422)

If you early-exercise ISOs and file 83(b), the ISO holding-period requirements still apply for qualifying disposition treatment:

• 2 years from grant date
• 1 year from exercise date

Filing 83(b) does not waive or shorten these periods. But because most early exercises happen close to the grant date, the 2-year grant-date clock and the 1-year exercise-date clock often overlap. The practical effect: by the time a liquidity event (tender offer or IPO) arrives 3–4 years later, both ISO holding periods are long satisfied, and the entire gain qualifies as long-term capital gains.

The AMT interaction: when you early-exercise ISOs and the bargain element is near zero (because strike ≈ FMV), the AMT preference item is also near zero. This is a massive advantage over exercising ISOs years later when the FMV has risen — at that point, the bargain element generates a significant AMT bill. Filing 83(b) at a low FMV effectively neutralizes the AMT problem before it starts.

When NOT to file 83(b)

The election is not universally correct. Situations where skipping it may be the better call:

• High exercise cost with uncertain employment: if early exercise costs $100K+ and you are not confident you will stay through the full vest, the forfeiture risk outweighs the tax benefit.
• Substantial spread at exercise: if the FMV at exercise is materially above your strike price, the 83(b) election triggers ordinary income tax immediately on the spread — cash you owe now with no liquidity to pay it. At a late-stage company with a $20 FMV and $0.10 strike, that is $1.99M of ordinary income on 100,000 shares.
• Company likely to fail: if you assess the company has a high probability of going to zero, paying any tax upfront (even on a small spread) is burning cash on an asset that will never produce a return.
• RSUs, unexercised options, or ESPPs: you cannot file 83(b) on these — see the eligibility table above.

Documentation checklist

Keep all of the following for as long as you hold the shares — and at least 3 years after you sell (the IRS statute of limitations on income reporting):

1. Signed copy of IRS Form 15620 (or your self-drafted 83(b) statement)
2. USPS Certified Mail receipt showing postmark date within 30 days of transfer
3. Return Receipt (green card) showing IRS delivery
4. Copy provided to employer with date of delivery (email confirmation or physical receipt)
5. Stock purchase agreement showing exercise date, number of shares, strike price, vesting schedule
6. 409A valuation report (or board-approved FMV determination) as of the transfer date
7. Copy attached to your tax return for the year of the transfer

The documentation matters because when you sell — potentially 5–10 years later — you need to prove: (1) the election was timely filed, (2) the FMV at transfer, and (3) your basis. Without the 409A report and the postmark receipt, reconstructing this years later is difficult and expensive.

Key takeaways

• The Section 83(b) election under IRC § 83 lets you pay ordinary income tax at grant or early exercise — when the FMV is lowest — converting all future appreciation to capital gains. At an early-stage startup with a near-zero 409A valuation, the tax at filing can be $0.
• The 30-day deadline from the date of property transfer is absolute. No extensions, no late filings, no reasonable-cause exceptions. File within the first 7 days and use certified mail with return receipt.
• RSUs are NOT eligible. Only restricted stock awards (RSAs), early-exercised options (ISO or NSO), and partnership profits interests qualify.
• If you file 83(b) and later forfeit unvested shares, the tax you paid is gone permanently — no deduction, no refund under IRC § 83(b)(1). Weigh forfeiture probability against the tax savings.
• In the worked example, the 83(b) election converted $552,500 of ordinary income into $990,000 of long-term capital gains — saving $190,000+ in federal tax. With QSBS § 1202 qualification (5-year hold, qualifying C-corp, gross assets under $50M), the federal bill on the gain drops to $0.
• File using IRS Form 15620 (or a substantially similar statement). Mail via USPS Certified Mail. Keep the postmark receipt and return receipt card indefinitely.