The 83(b) Election: A 30-Day Decision That Can Save Founders Six Figures in Taxes

A founder receives 4 million shares of restricted stock at $0.0001 per share—worth a grand total of $400. Four years later, the company exits at $20 per share. Without a single piece of paper filed in the first month, that founder pays ordinary income tax (potentially up to 37%) on roughly $80 million as the shares vest. With that paper filed on time, the same founder pays a few dollars in tax up front and the entire $80 million gain qualifies for long-term capital gains treatment.

That paper is the Section 83(b) election. The window to file it is exactly 30 days from the date your shares transfer—no extensions, no exceptions, not even one day late. If you've recently been granted restricted stock or early-exercised stock options, this is the most consequential tax decision you'll make this year. Here's everything you need to know to make it correctly.

What Is a Section 83(b) Election?

When you receive equity that's subject to vesting, the IRS treats each tranche of shares as taxable income at the moment it vests, based on the fair market value (FMV) on that vesting date. For most startup employees and founders, this is a problem: by the time your shares vest, the company is hopefully worth a lot more, which means a much bigger tax bill—often paid in cash you don't have because the stock is illiquid.

A Section 83(b) election is a one-page filing under Internal Revenue Code Section 83(b) that lets you flip the timing. You voluntarily recognize the value of all your restricted shares as ordinary income on the grant date instead of as they vest. In exchange, all future appreciation is taxed at the much friendlier long-term capital gains rate when you eventually sell.

Two key distinctions before going further:

• Restricted stock awards (RSAs): You can file an 83(b) directly on the grant.
• Stock options (ISOs/NSOs): You cannot file an 83(b) on an unexercised option. You must first early-exercise the option (if your plan allows it), and then file an 83(b) on the resulting restricted shares.
• Restricted stock units (RSUs): You generally cannot file an 83(b) on RSUs. RSUs are a contractual promise, not a transfer of property.

The Math: Why It Matters So Much

Consider a hypothetical scenario that mirrors what happens at thousands of startups every year.

The Grant: You receive 100,000 shares of restricted stock at $0.05 per share, vesting over four years. Total fair market value at grant: $5,000.

Without the 83(b) election, assume the FMV climbs as follows:

• End of Year 1 (25,000 shares vest): $1.00/share → $25,000 ordinary income
• End of Year 2 (25,000 shares vest): $4.00/share → $100,000 ordinary income
• End of Year 3 (25,000 shares vest): $10.00/share → $250,000 ordinary income
• End of Year 4 (25,000 shares vest): $20.00/share → $500,000 ordinary income

Total ordinary income recognized: $875,000, taxed at rates up to 37% federal plus state and self-employment-style payroll taxes if you're a contractor. You owe this tax even though you can't sell the shares to cover it.

With a timely 83(b) election:

• At grant: $5,000 of ordinary income (often a few hundred dollars in tax, sometimes zero if you paid FMV)
• At each vesting date: $0 additional ordinary income
• Final sale at $20/share: $1,995,000 of long-term capital gain, taxed at 15–20% federal

The 83(b) approach in this example can shift hundreds of thousands of dollars from ordinary income rates into long-term capital gains rates—and it eliminates the painful "phantom income" tax bills along the way.

The Strict 30-Day Deadline

The single most important fact about the 83(b) election: you have 30 calendar days from the grant date to file. Day 0 is the grant date, Day 1 is the next day, and you count forward 30 calendar days. If Day 30 falls on a Saturday, Sunday, or federal holiday, the deadline rolls to the next business day.

This deadline is absolute. The IRS provides no extensions, no hardship exceptions, and no "I didn't know" relief. A late filing is simply void, and the election doesn't apply. Tax courts have rejected challenges from people who missed the deadline by even a single day.

A few common deadline traps:

• Confusing grant date with offer letter date: The 30 days starts on the actual transfer of the equity, not the day you signed your offer.
• Confusing grant date with board approval: The clock typically starts when shares are issued and the stock purchase or restricted stock agreement is signed, not necessarily when the board approves the grant.
• Trusting unclear postmarks: If you mail it, use USPS Certified Mail with Return Receipt and keep the receipt forever.

Two Ways to File: Paper vs. the New Online Portal

Until recently, every 83(b) election was a paper filing dropped into the mail. In late 2024, the IRS introduced Form 15620, a standardized 83(b) election form, and in 2025, an electronic filing option through the IRS online services portal.

Option 1: File Online via Form 15620

The newer, faster path. You'll need:

1. An IRS Online Account (set up via ID.me identity verification)
2. Form 15620, completed digitally on the IRS portal
3. Your taxpayer identification number (SSN or ITIN), the description of the property, the FMV per share, the price paid, and the grant date

Submit through the portal and download your confirmation page. The system generates a timestamped record, which is dramatically more reliable than waiting for a return-receipt card. Print the confirmation and save the PDF.

Important: Even after filing online, you must still send a copy of the election to your employer or issuing company so they can update their tax records and any future W-2 or 1099 reporting.

Option 2: File on Paper

Still valid, and sometimes preferred by tax advisors who are wary of new portals. The process:

1. Complete Form 15620 (or an equivalent written statement that contains the same required information).
2. Sign and date it.
3. Mail it via USPS Certified Mail with Return Receipt Requested to the IRS Service Center where you file your federal income tax return.
4. Send a copy to your employer or the issuing company.
5. Keep a copy with your permanent tax records.

Whichever method you choose, the IRS no longer requires you to attach a copy of the 83(b) election to your annual Form 1040, but you absolutely must keep proof of timely filing for the rest of your life.

What Goes on the Form

A valid Section 83(b) election must include:

• Your full name, address, and taxpayer identification number (SSN/ITIN)
• A description of the property—e.g., "100,000 shares of common stock of Acme, Inc."
• The date of transfer (grant date) and the taxable year
• Any restrictions placed on the property
• The fair market value at the time of transfer
• The amount paid for the property (which may be zero, or the par value, or the strike price if you early-exercised)
• A statement that copies have been provided to all required parties
• Your signature and the date

If any required field is missing or wrong, the IRS can deem the election invalid. This is one piece of paperwork where over-precision pays off.

When You Should File

The election is most valuable when:

• You're a founder or very early employee with stock priced at or near zero.
• Your stock is appreciating quickly and you expect substantial growth before vesting completes.
• You can afford the up-front tax (which may be zero if FMV equals what you paid).
• You believe in the company long term and plan to stay through the vesting period.
• You're early-exercising ISOs or NSOs, where filing 83(b) starts your long-term capital gains and ISO holding period clocks running on the exercise date instead of each vesting date.
• You may qualify for Qualified Small Business Stock (QSBS) treatment under Section 1202, where the holding period also starts at the time of the 83(b)-elected purchase.

When You Should Not File

The election can backfire when:

• The FMV is high relative to what you paid. If you'd owe substantial taxes on grant value but the stock might decline or you might leave, you'd be paying real tax on paper gains that may never materialize.
• You're likely to leave before vesting. Median tenure at startups is roughly two years, while a typical vest is four. If you forfeit unvested shares, the IRS will not refund the taxes you paid on them via the 83(b).
• The company is at a high valuation already. A late-stage hire receiving stock at, say, a $1 billion valuation would trigger a massive immediate tax bill with limited remaining upside.
• Your stock has a real risk of going to zero. You'd be paying ordinary income tax on something that may end up worthless.

There is no universal right answer; it depends entirely on the specific facts of your grant, your financial situation, and your read on the company's trajectory.

The Risks You Need to Take Seriously

1. Forfeiture Risk

If you leave or are terminated before all your shares vest, you forfeit the unvested portion. The 83(b) election does not get you a refund of taxes paid on those forfeited shares. The IRS allows you to claim a capital loss on the difference between the price you paid and the amount you received back (often zero), but you don't recover the ordinary income tax you paid on the original grant value.

2. Decline-in-Value Risk

If the company's stock drops below the FMV you elected, you've essentially prepaid tax on phantom gains. You can deduct a capital loss when you sell, but again, you can't claw back the ordinary income tax.

3. Irrevocability

You cannot undo an 83(b) election. Once filed, it is permanent.

4. State Tax Complications

States generally follow the federal treatment, but some have quirks—particularly if you move during the vesting period. California, New York, and Massachusetts each have specific rules on multi-state taxation of equity that can significantly change the math.

What Happens If You Miss the Deadline

There is no formal mechanism to "fix" a missed 83(b) election. The IRS has flatly stated the 30-day deadline is jurisdictional and cannot be waived. That said, practitioners sometimes explore strategies after the fact:

• Re-issuing the stock: In some cases, the company can cancel the original grant and issue a new one (with a new grant date), giving you a fresh 30-day window. This requires the company's cooperation and sometimes raises 409A valuation issues.
• Section 83(c)(3) substantial risk of forfeiture analysis: Sometimes the original "transfer" may not have been complete for tax purposes, restarting the clock—this is highly fact-specific and requires careful tax counsel.
• Estimating capital gains on sale: If the FMV at grant was very low, the practical impact may be modest, and you can simply accept the original tax treatment.

None of these are reliable fallbacks. The best strategy is simply to file on time.

A Practical Filing Checklist

Use this when you receive any restricted stock grant:

• Day 0: Confirm the actual grant/transfer date in writing from your employer. Get the stock purchase agreement, not just the offer letter.
• Day 1: Calendar the 30-day deadline twice (e.g., a Day 14 reminder and a Day 25 hard deadline).
• Day 1–5: Confirm the FMV and price paid in writing. Ask your company for their 409A valuation report.
• Day 5–10: Decide whether to file. Consult a tax advisor familiar with startup equity if any factor is unclear.
• Day 10–20: Complete Form 15620 (online or paper). Have a tax professional review it before submission.
• Day 15–25: File. If by mail, use USPS Certified Mail with Return Receipt.
• Day 25–30: Send a copy to your employer or the issuing company.
• Permanent: File your confirmation, certified mail receipt, and copy of the form in a place you'll still find in 10 years.

Coordinating With Your Bookkeeping

Because an 83(b) election creates a real tax event in the year you file (sometimes resulting in W-2 income or self-employment income to report), accurate bookkeeping from day one is critical. You'll want clear records of:

• The grant date, share count, and FMV used on the election
• The amount paid for the shares
• Any tax actually paid as a result
• Your cost basis in the shares (price paid + ordinary income recognized)
• The eventual sale price and holding period

This is exactly the kind of long-running, audit-sensitive record-keeping where a plain-text accounting system shines—every transaction is human-readable, every calculation is reproducible, and you'll still be able to read the file in 30 years when you finally sell the shares.

Keep Your Founder Finances Organized From Day One

The 83(b) election is one of many decisions where great record-keeping turns into real money saved. As a founder or early employee, your equity, capital gains, and cost basis tracking will follow you for a decade or more. Beancount.io provides plain-text accounting that's transparent, version-controlled, and AI-ready—so you can track your equity, vesting events, and cost basis with the same precision the IRS expects from you. Get started for free and own your financial data the way founders own their stock: completely.