The 83(b) Election: The 30-Day Decision Every Founder Faces

A Section 83(b) election tells the IRS to tax your restricted stock when you receive it, based on its value at that moment, instead of taxing it as it vests at whatever it is worth later. You must file within 30 days of the stock transfer, with essentially no exceptions. For founders who buy shares at or near fair market value, the election usually costs little or nothing today and converts all future appreciation into capital gain, while also starting the holding-period clocks that matter for long-term rates and qualified small business stock.

The decision is small in paperwork and large in consequence. Here is how it works, when it backfires, and how to file it correctly.

What does Section 83 do without an election?

Section 83 governs property received for services. If your shares are subject to vesting (a "substantial risk of forfeiture"), the default rule ignores them for tax purposes until each portion vests. At every vesting date, the spread between the fair market value and what you paid is ordinary compensation income, subject to income and payroll taxes, even though you received no cash.

For a startup that succeeds, that default is punishing. Each vesting tranche is taxed at a higher valuation, at ordinary rates, and your capital gains holding period only begins as each tranche vests. The 83(b) election replaces all of that with a single taxable moment on day one.

A hypothetical worked example

Hypothetical: a founder purchases 1,000,000 restricted shares at $0.01 per share, paying $10,000, when fair market value is also $0.01. The shares vest over four years.

With an 83(b) election, taxable income at grant is fair market value minus price paid: zero. The founder pays nothing now, the entire holding period starts immediately, and if the company sells five years later at $5.00 per share, the $4,990,000 gain is long-term capital gain, and potentially excludable under Section 1202 if the stock qualifies.

Without the election, suppose the shares vest in equal annual tranches while the value climbs to $0.50, $1.50, $3.00, and $4.00. The founder would recognize roughly $2,247,500 of cumulative ordinary income across the four vesting dates ($122,500 plus $372,500 plus $747,500 plus $997,500, computed as value over cost on 250,000 shares each year), owing tax each year with no liquidity to pay it. At a 37% federal rate that is over $830,000 of tax before state tax, versus zero under the election. The numbers are illustrative, but the asymmetry is real.

When should you NOT file an 83(b) election?

The election is not automatic wisdom. It tends to be a mistake in these situations:

• There is a large spread at grant. If you receive shares worth substantially more than you pay, the election triggers ordinary income tax now on value you may never realize in cash.
• Forfeiture is likely. If you leave or the company fails before vesting, you get no deduction and no refund for taxes paid under the election; your capital loss is limited to the amount you actually paid for the shares, not the tax you sent the IRS.
• You cannot fund the tax. The election accelerates a real cash liability against an illiquid asset.
• The value may fall. Paying tax at today's valuation on shares that later mark down locks in tax on phantom value.

A useful rule of thumb: the election is most attractive when the spread at grant is zero or small, which is exactly the situation of founders purchasing stock at formation and early employees early-exercising options at current fair market value.

How do you file, and what changed with Form 15620?

The deadline is 30 days from the date the stock is transferred to you, counting weekends and holidays. Courts and the IRS treat the deadline as strict; there is no general relief for late filings.

Filing got easier in 2025. The IRS released Form 15620, a standardized 83(b) election form, and then enabled electronic submission through its online portal, so taxpayers can now file digitally through an IRS online account instead of mailing a letter to a service center (IRS Form 15620; law firm alerts, 2025). Whether you file online or by certified mail, file only one way, keep proof of timely submission, and give a copy to the company. Your employer or issuer still needs the election to handle its own reporting correctly.

A few practical notes. The 30-day clock runs from the stock transfer date, not the board approval date or the date you signed the purchase agreement, and disputes about that date are common enough that careful records matter. Spouse signature requirements in community property states and inclusion of the election with your records are details worth confirming with counsel.

How does the election interact with QSBS and equity compensation?

For founders, the quiet payoff of an 83(b) election is timing. Your Section 1202 qualified small business stock holding period, and your ordinary long-term capital gains holding period, generally begin only when stock is vested or when a valid 83(b) election is made. Filing at grant can therefore start the five-year QSBS clock years earlier, which under current law can be the difference between partial and full exclusion of a very large gain. We explain the QSBS rules, including the post-OBBBA $15 million exclusion and tiered holding periods, in QSBS After the One Big Beautiful Bill, so we will not repeat them here.

The election also appears in option planning. Early-exercising nonqualified options and filing an 83(b) freezes the compensation element at exercise; for incentive stock options, an 83(b) election on early exercise applies for AMT purposes. The mechanics of ISOs, NSOs, and RSUs are covered in Equity Compensation Planning. One important boundary: standard RSUs are not eligible for 83(b) elections, because no stock is transferred until settlement.

Key numbers

Frequently asked questions

Can I file an 83(b) election late?No. The 30-day deadline is statutory and strictly enforced, with no general extension or relief. Missing it means the default vesting-date taxation applies.

Do I need to file an 83(b) for fully vested stock?No. Section 83(b) only matters for stock subject to a substantial risk of forfeiture. Fully vested stock is taxed at receipt under the normal rules.

Can I make an 83(b) election on RSUs?No. RSUs are an unfunded promise to deliver shares later, so no property has been transferred and there is nothing to elect on.

What does filing cost if my purchase price equals fair market value?Nothing in current tax, because the recognized income is zero. You still must file on time for that zero-income treatment to lock in.

Is the election revocable?Only with IRS consent, requested within the same 30-day window and generally only for limited reasons such as a mistake of fact. Treat it as irrevocable.

Does an 83(b) election affect my QSBS five-year holding period?Yes. For restricted stock, the Section 1202 holding period generally begins at vesting unless a valid 83(b) election starts it at grant, which can accelerate qualification by years.