What Is an 83(b) Election? Startup Equity Tax Timing

An 83(b) election is a notice filed with the IRS that lets someone receiving restricted stock choose to pay income tax on the full value of that stock at the time it’s granted, rather than as it vests. Named for the section of the tax code it invokes, it’s a timing decision founders and early employees make when they receive equity that’s subject to a vesting schedule and still has a real chance of being forfeited if they leave early.

The election matters because of when the tax bill lands and how large it is. Without it, the IRS treats restricted stock as taxable income only once it vests — and it taxes you on the value at that later date, not the value when you were granted it. If the company has grown a lot between grant and vesting, that difference can be enormous. Filing an 83(b) election locks in the tax basis at grant, when the value — and therefore the tax bill — is typically as small as it will ever be.

Why the timing matters so much

Restricted stock isn’t fully yours the moment you receive it. It’s subject to a vesting schedule, and if you leave before a given tranche vests, the company can buy it back (often for what you originally paid, sometimes for nothing). Tax law treats unvested property specially: by default, you don’t recognize income on it until it vests, because until then you don’t have unrestricted ownership.

That default sounds reasonable, but it interacts badly with how startup valuations move. Consider a founder granted shares at incorporation, when the company is worth close to nothing:

• Without an 83(b) election: as each tranche vests over the following years, the IRS taxes the value of that tranche at that vesting date’s fair market value — which, if the company has taken funding rounds and grown, could be many times the original price. Ordinary income tax applies to the spread between what was paid and what it’s worth at vesting.
• With an 83(b) election: the entire grant is taxed once, at the (usually negligible) value on the grant date. Future appreciation is deferred until the stock is actually sold, and taxed at capital gains rates rather than ordinary income rates — see what a qualified dividend is for a similar rate-driven timing distinction elsewhere in the tax code.

For a founder receiving stock worth fractions of a cent per share at incorporation, the tax bill on an 83(b) election is often close to zero. Waiting and letting the stock vest without the election, after the company has raised money and the fair market value per share has climbed, can turn that same grant into a real tax liability — payable in cash, even though the stock itself isn’t liquid and can’t be sold to cover it.

The catch: it’s a bet, and the deadline is unforgiving

The election has to be filed with the IRS within 30 days of the grant date. There is no extension and, practically speaking, no exceptions for missing it — file late and the option is gone for that grant.

It’s also a genuine bet, not a free lunch. If you file an 83(b) election, pay tax on the grant-date value, and then leave the company (or it fails) before your shares vest, you don’t get that tax back. You’ve paid tax on stock you never actually kept. This is precisely the scenario the default rule — tax at vesting, not at grant — is designed to protect against, and it’s why the election is optional rather than automatic.

The decision generally comes down to how confident you are in two things: that you’ll stick around long enough to vest, and that the company’s value will rise substantially between grant and vesting. Early-stage founders and employees, where the grant-date valuation is near zero and the anticipated growth is the whole point of joining, are the classic case where the election is close to a no-brainer. Someone receiving restricted stock in a company at a much higher, already-established valuation has a smaller gap to lock in and a correspondingly smaller reason to rush the election.

83(b) elections vs standard stock options

It’s worth distinguishing this from option grants, which work differently and don’t involve an 83(b) election in the same way:

	Restricted stock (with 83(b))	Stock options
What you receive	Actual shares, subject to forfeiture	The right to buy shares later at a fixed price
Taxable event	Grant date (if elected)	Exercise date (for ISOs, potentially AMT; for NSOs, ordinary income)
Election available	Yes — 83(b), 30-day deadline	Not applicable the same way; timing decision is when to exercise
Typical holder	Founders, very early employees	Employees joining after the company has more value

Options are the more common instrument for employees joining after a company has meaningfully priced its equity, precisely because exercising immediately and separately electing 83(b) on the resulting restricted shares (an “early exercise” plan) is a specific plan design, not the default. Restricted stock grants directly to founders at incorporation, by contrast, are exactly the scenario 83(b) elections were built for.

Filing mechanics

The filing itself is a short, specific letter to the IRS describing the property received, the date of transfer, the fair market value, and the amount paid — sent to the IRS service center where the taxpayer files their return, with a copy kept for personal records and (typically) provided to the company issuing the stock. Because the 30-day window is unforgiving and the decision is irreversible once made, most people going through this — especially anyone receiving a founder grant at incorporation — work with a tax professional or startup-focused attorney rather than filing on instinct alone. This is not a decision to reverse-engineer from a blog post; it hinges on details specific to the grant, the cap table, and the individual’s tax situation.

The takeaway

An 83(b) election trades a small, near-certain tax payment today for the ability to defer and reclassify a potentially much larger tax bill later — but only if the shares actually vest. It’s most valuable early, when a company’s valuation is lowest and the anticipated growth between grant and vesting is largest, which is why it’s most associated with founders and very early hires. Miss the 30-day filing window and the choice disappears; file it and then leave before vesting, and the tax paid on unvested stock isn’t refunded. It’s a bet on staying and on the company growing, made with a hard deadline and no do-overs.