Section 83(b) Election: When to File, How Founders Save Thousands

If you've just received founder stock, joined a startup early enough to early-exercise your options, or accepted restricted stock as part of an executive package, there is one tax form that can save you tens or hundreds of thousands of dollars over the life of your equity. It is one page long, costs nothing to file, and has a deadline so short and so unforgiving that most people who should file it never do: the Section 83(b) election.

Miss the 30-day window and you cannot file it. Not late. Not after a private letter ruling. Not ever for that grant. The IRS has consistently rejected every theory of equitable relief. We see at least one founder per quarter who blew the window, and the tax cost is almost always in the six figures.

This guide explains what Section 83(b) does, when filing is the right call, when filing is the wrong call, the exact mechanics, the common pitfalls, and the 2024 IRS update that finally permits electronic filing. We work through these decisions constantly with founders and tech employees at our equity compensation tax practice.

What Section 83(b) Actually Does

Under the default rule of IRC Section 83, when you receive restricted property in exchange for services — typically stock that is subject to vesting or a repurchase right — you are taxed at vest, on the difference between the fair market value (FMV) at vest and what you paid. That income is treated as ordinary compensation: it goes on your W-2 (or 1099 for contractors), is subject to payroll taxes, and is taxed at rates up to 37% federal plus state.

The 83(b) election lets you opt out of that default. Instead of waiting until vest, you elect to recognize the income at grant, based on the FMV at grant minus what you paid. If you file 83(b) on founder stock issued at $0.0001 per share when you paid $0.0001 per share, the spread is zero. No income. No tax. And the holding period for long-term capital gains starts on the grant date, not the vest date.

The economic result, in the right situation, is dramatic: the future appreciation of the stock — potentially millions of dollars — is taxed at long-term capital gains rates (0%, 15%, or 20% plus the 3.8% net investment income tax) instead of as ordinary income at vest. For QSBS-eligible stock, that future gain may not be taxed at all on the federal side; see our post on QSBS / Section 1202 for the federal exclusion mechanics.

When to File 83(b)

Three classic fact patterns where filing is almost always the right call:

1. Founder restricted stock at incorporation

You incorporate a Delaware C-corp, buy 10 million shares of founder common stock at $0.0001 per share, and subject them to a 4-year vesting schedule with a 1-year cliff. The FMV at issuance is approximately your purchase price (assuming a defensible 409A in the rare cases one exists yet). Spread: ~$0. File 83(b): zero current tax, holding period starts now, and assuming you're still around to vest, every dollar of appreciation between now and exit is capital gain.

2. Early-exercise NSOs or ISOs at a startup

Your offer included options with an early-exercise provision. You exercise immediately, before the 409A has moved meaningfully. You receive shares subject to a repurchase right that lapses on the original vesting schedule. The shares are restricted property in IRS terms, so the 83 rules apply. File 83(b): for NSOs, lock in today's tiny spread as ordinary income and convert all future appreciation to capital gain; for ISOs, eliminate the AMT preference that would otherwise haunt you years later. See ISO vs NSO for the broader option-tax framework and AMT in 2026 for the AMT angle.

3. Restricted stock awards with low current FMV but high upside

Executive RSAs (not RSUs — those are different and 83(b) does not apply) granted at a fair-market price in early-stage companies. Same logic as founder stock: pay the small bill now to start the capital-gains clock.

When NOT to File 83(b)

Three situations where 83(b) is the wrong move:

• You are not confident you will vest. If you file 83(b), pay tax, and then forfeit the stock (you leave before cliff, you get terminated, the deal blows up), you do not get the tax back. There is no refund mechanism. Filing 83(b) on a high-FMV grant and then forfeiting can be very expensive.
• The current FMV is already meaningfully high. If you receive restricted stock when the FMV has appreciated significantly (a late-stage company, a recent post-money valuation, etc.), the tax owed at 83(b) filing could be substantial. Many people misjudge whether the future upside justifies writing a check today.
• You received RSUs, not restricted stock. RSUs are a promise to deliver shares in the future, not a transfer of property today. 83(b) does not apply to standard RSUs. Filing it on RSUs is a common mistake that does nothing.

The 30-Day Deadline — and How to File

The election must be filed with the IRS within 30 days of the date the restricted property is transferred to you. The transfer date is typically the grant date for founder stock or the exercise date for early-exercised options. Not the vesting commencement date. Not when you sign the paperwork. The actual transfer date.

The deadline is a hard 30 days. Calendar days, including weekends and holidays. The IRS has consistently held that there is no late filing relief, no good-cause exception, and no private letter ruling that can rescue a missed window.

The filing itself

1. Prepare a one-page Section 83(b) election letter containing: your name, address, taxpayer identification number, a description of the property (number of shares, the company, the date of transfer), the FMV at transfer, the amount paid, and a statement that you elect under §83(b) to include the spread in income for the current taxable year.
2. Sign and date the letter.
3. File it with the IRS service center where you ordinarily file your tax return. As of 2025, the IRS accepts e-filing of 83(b) elections through the new electronic submission portal (Form 15620 / IRS.gov). Before this change, paper certified mail was the only accepted method. Both still work; e-filing is faster and creates an instant timestamped proof.
4. Deliver a copy to your employer or grantor (the company that issued the stock). This is required.
5. Retain a copy for your own records.
6. Report the election on your federal tax return for the year of transfer.

If you e-file: keep the IRS confirmation. If you paper-file: certified mail with return receipt is the only safe method. Plain first-class mail leaves you with no proof if the IRS claims they never received it.

Worked Example: Founder Stock

You incorporate Newco Inc. on June 1, 2026, and purchase 10,000,000 shares of founder common stock at $0.0001/share, for a total purchase price of $1,000. The FMV at issuance is also $0.0001/share. Vesting: 4 years, 1-year cliff.

Without 83(b): Each tranche of stock is taxed as ordinary income at vest, on the FMV-at-vest minus your $0.0001 cost basis. If the company raises a Series A within a year at a $30M post-money, your 409A might jump to $0.50/share. The first 25% (2.5M shares) vesting next June would generate $1,249,975 of ordinary W-2-style income on the spread, taxed at marginal rates up to 37% federal. Tax owed at vest: roughly $500,000+ at federal+state combined — with no liquidity to pay it.

With 83(b): You file within 30 days of June 1. The spread is $0. No tax owed in 2026. Holding period starts June 1, 2026. When you eventually sell, every dollar above $0.0001/share is taxed at long-term capital gains rates (and may be excluded under §1202 QSBS if the company qualifies).

Common Pitfalls

1. Missing the 30-day deadline. The single most expensive mistake in founder tax. Calendar the deadline the moment you receive any restricted-property grant.
2. Not delivering a copy to the employer. Required. Missing this step can invalidate the election.
3. Filing on RSUs. RSUs are not restricted property — 83(b) does not apply. If your award says "restricted stock units," it is a different instrument.
4. Filing without proof of timely receipt. Paper plus regular mail = no proof. Use certified mail return-receipt or the IRS electronic submission portal.
5. Filing on stock you cannot actually purchase yet. Some advisors mistakenly attempt to file 83(b) on options that have not been exercised. The election only applies to actual stock transfers, not to outstanding option grants. Exercise first, then file within 30 days of exercise.
6. Forgetting to report on the tax return. The election needs to be reflected on Form 1040 for the year of transfer (typically as $0 income for founder grants at FMV).
7. Filing 83(b) on a high-FMV grant without modeling the forfeiture risk. If the spread is meaningful, run the math on what you owe today versus what you might forfeit if you leave before vest.
8. Assuming your lawyer will file it. Many startup formation packages include a draft 83(b) but rely on the founder to actually file. Confirm — in writing — who is filing and on what date.

Mechanics for Tech Employees with Early-Exercise Options

If you joined a startup early enough that your option grant has an early-exercise provision (sometimes called "early exercise of unvested shares"), 83(b) is almost always the right move. Mechanics:

• Exercise the options (pay the strike price to the company, receive shares subject to the same vesting that applied to the options).
• Within 30 days of exercise, file the 83(b) election. The spread for tax purposes is FMV-at-exercise minus strike — which is typically zero or near zero when you early-exercise at the original strike.
• For NSOs: the spread (if any) is W-2 ordinary income for the current year.
• For ISOs: the spread (if any) is an AMT preference item, not regular ordinary income — but starting the holding-period clock now avoids most of the AMT pain you would otherwise face if you exercised post-vest.
• Repurchase right vs forfeiture: if you leave before vest, the company buys the unvested shares back at your strike price. You get your purchase money back, but you do not get a refund of any income tax you paid via 83(b).

Action Items

• Identify the transfer date. The 30-day clock starts on the actual stock transfer, not the offer letter or vesting commencement.
• Calendar the deadline as a hard block. Day 30 from the transfer date. Add a buffer reminder at day 14 and day 21.
• Get a defensible FMV. For founder stock at incorporation, the purchase price is typically the FMV. For later grants, a recent 409A valuation governs.
• File electronically if possible. The IRS portal launched in 2025 and gives you an instant timestamped confirmation. Paper certified mail remains acceptable.
• Deliver to the employer. Required step. Keep the delivery confirmation.
• Report on the current-year return. Your tax preparer needs to know the election was made and the spread amount (often $0).

When to Talk to Us

Section 83(b) decisions are short-deadline and consequential. The window opens the day your stock is transferred and closes 30 days later. If you have just been issued founder stock, accepted an offer with early-exercise options, or received a restricted stock award, the right time to talk to a tax advisor is this week, not next month.

At Silicon Valley Tax, we walk founders and early employees through the 83(b) decision the same week the equity hits — modeling the forfeiture downside against the upside, drafting and filing the election if it makes sense, and coordinating with the company for proper delivery. Schedule a free consultation and we will run your specific situation through the math before the clock runs out.