The 83(b) Election: Why 30 Days Can Save You Six Figures

This post is general information, not tax advice for your specific situation. Talk to your CPA before filing, and mind the 30-day deadline.

There is no other 30-day window in a founder’s life that can cost six figures the way a missed 83(b) election can. If you receive founder stock or restricted shares that vest over time and you do nothing, you can end up paying ordinary income tax, year after year, on the growing value of equity you already own, for the privilege of watching your own company succeed. File one short form within 30 days and you flip that outcome entirely. The election is not complicated, the form is now standardized, and as of 2025 you can file it online. The only genuinely unforgiving part is the deadline.

This post covers what the 83(b) election actually does, the tax math that makes it matter so much, who needs to file, and exactly how to do it in 2026.

What the 83(b) Election Does

When you receive equity that is subject to vesting, the tax code’s default treatment is to tax you as the shares vest, based on their value at each vesting date. The logic is that you do not truly “own” unvested shares until they vest, so the government waits to tax you until you do. For a startup whose value is climbing, that default is a trap. As each tranche vests, the shares are worth more, and you owe ordinary income tax on that higher value, even though you have not sold anything and have no cash from the stock to pay the bill.

The 83(b) election lets you choose to be taxed up front instead, on the value of all the shares at the moment they are granted, as if they were fully vested on day one. At founding, that value is typically tiny, often a fraction of a cent per share, so the tax is often near zero. You are electing to recognize a very small amount of income now to avoid recognizing a potentially enormous amount later. It also starts your long-term capital gains holding clock at grant, which matters when you eventually sell.

The Tax Math, With Numbers

Consider a founder granted 1,000,000 shares at a par value of $0.0001 per share, so a total value of $100 at grant, vesting over four years.

With an 83(b) election filed in time, you recognize $100 of income now. At ordinary rates that is a tax bill of roughly a few dollars to a few tens of dollars. From that point, future appreciation is not ordinary income at all. When you eventually sell, the gain is taxed as capital gains, and because your holding period started at grant, it is more likely to qualify for long-term treatment.

Without the election, you are taxed at each vesting date on the value then. Suppose the stock is worth $1 per share when the second year’s 250,000 shares vest. That is $250,000 of ordinary income in that year alone, taxable at your marginal rate, with no stock sale to fund it. Repeat at each vesting event as the price climbs. The same equity, the same founder, the same company, and the difference between the two paths can run well into six figures, sometimes far more. That is the entire reason this one-page election is treated as sacred at every startup.

The election is a bet that your equity will be worth more later, which is precisely the bet you are making by being a founder or early employee. It can technically backfire only if you pay tax on a value the stock never reaches, but at typical grant valuations the downside is a handful of dollars and the upside is enormous.

How the 83(b) Election Changes Your Payout at Exit

The grant-date math is only half the story. The election’s real power shows up years later, on the day you sell, because it changes how much of your exit proceeds the government takes. Take the same founder with 1,000,000 shares, granted at $100 total, and assume the company is acquired and the shares sell for $10 each, so a $10,000,000 payout. The rates below are simplified and federal-only, ignoring state tax, but the shape of the result is what matters.

With the 83(b) election filed on time, you recognized that trivial $100 at grant, and your holding period started at grant. Every dollar of the climb from $100 to $10,000,000 is capital gain. Held more than a year, it is long-term capital gain, taxed at roughly 23.8% federal once you include the net investment income tax. That is approximately $2.38 million of tax on the $10 million, leaving you about $7.6 million. One clean event, the lowest available rate, paid only when you actually have the cash from the sale.

Without the election, the picture is worse in two separate ways. First, you were taxed as ordinary income at each vesting date on the value then, not at exit. If the stock was worth, say, $1, $3, $6, and $9 at your four annual vesting dates, you recognized $250,000, $750,000, $1.5 million, and $2.25 million of ordinary income in those years, about $4.75 million total, taxed at ordinary rates up to 37%, roughly $1.76 million. You owed that tax in years when you had sold nothing and had no cash from the stock to pay it. That is the phantom income problem, and it is brutal: a tax bill on paper gains you cannot spend. Second, at the eventual $10 million sale, your basis is the roughly $4.75 million already taxed, so your remaining capital gain is about $5.25 million, another roughly $1.25 million at long-term rates. Add it up and you paid on the order of $3.0 million in total tax, much of it years early and at the highest ordinary rates, versus about $2.38 million with the election, all deferred to the liquidity event.

The gap is larger than the headline number suggests, because the no-election path forces you to pay high ordinary rates out of pocket long before any payout, while the election path defers everything to the moment you are actually paid and taxes it at the lowest rate. And there is a further exit advantage: holding from the grant date can start your five-year clock under the qualified small business stock rules (Section 1202) earlier, which at exit may let you exclude a substantial portion of your gain from federal tax entirely. Filing the 83(b) is often what puts that clock in motion sooner. None of this upside is available if the 30 days lapse.

Who Needs to File

You need to consider an 83(b) election whenever you receive equity that is subject to a substantial risk of forfeiture, which almost always means subject to vesting. The most common cases are founders who buy restricted stock at incorporation with a vesting schedule, early employees who receive restricted stock awards, and anyone who early-exercises stock options before they have vested. If you received fully vested shares with no vesting schedule, there is nothing to elect. If your equity vests over time, this is for you.

One important note for option holders: a standard option grant that you have not exercised is not itself an 83(b) situation. The election becomes relevant the moment you early-exercise unvested options, because now you hold restricted stock subject to vesting. If early exercise is on the table, the 83(b) clock starts when you exercise. And because early exercise means buying at the option’s strike price, which your company’s 409A valuation sets, the two filings are worth understanding together.

How to File in 2026

The mechanics got meaningfully easier recently, but the deadline did not move.

The deadline is 30 days from the date the stock is transferred to you, meaning the grant or early-exercise date. This is a hard statutory deadline. The IRS does not grant extensions, and there is no reasonable-cause relief for missing it. Day 31 is too late, full stop. Count calendar days, not business days, and file early rather than testing the edge.

As of January 2025, the IRS provides a standardized form, Form 15620, for making the election. Previously founders drafted their own election letters, which worked but invited errors. The official form removes the guesswork about what to include.

Since mid-2025, you can file Form 15620 electronically through IRS.gov, which is now the simplest route. Electronic filing is free and gives you instant confirmation of receipt, which solves the old anxiety of mailing a paper election and praying it arrived. Filing online generally requires an ID.me account, which involves a one-time identity verification.

You can still file on paper by mailing the signed election to the IRS service center where you file your returns. If you go this route, understand one thing clearly: the IRS will not send you a confirmation letter. There is no acknowledgment, no receipt from them, no “your election was accepted” email. Years later, when your company exits and a buyer’s tax team asks you to prove the election was filed on time, the only evidence you will have is what you kept yourself.

So mail it certified, with return receipt requested, and treat the proof like a legal document, because it is one. Keep the certified mail receipt, the stamped green return-receipt card, the tracking record, and a copy of the signed election together, and keep them indefinitely, not until next tax season but until well past the day you sell your shares. Scan all of it the day you mail it. The postmark date is what establishes you filed within the 30 days, and that paper trail is the only thing standing between you and a very expensive argument at exit. This is the single biggest advantage of the new electronic filing: it gives you instant digital confirmation, which removes the lifelong record-keeping risk entirely. If you file on paper, you are your own record-keeper forever.

Two things remain true regardless of how you file. You still must provide a copy of the election to your company. And while you no longer attach the election to your tax return (that requirement ended in 2016), you do still report the income from the election on your return for the year of the grant.

If You Think You Missed It

If the 30 days have passed, the election is gone, and no amount of paperwork brings it back. The honest move is to talk to a tax advisor about damage control, because the path forward depends on your specific facts, the size of the grant, and the company’s trajectory. The far better outcome is to never be in this position, which means treating the 83(b) window as the first thing you handle the moment you receive vesting equity, before the company gets busy and the calendar gets away from you. The 83(b) clock is the tightest deadline you will face, but it is not the only one; the rest of the year’s filings are mapped in every tax deadline your Delaware/California startup needs to know.

The summary is simple. If you have equity that vests, file the 83(b) within 30 days of the grant. The form is standardized, the filing is free and now electronic, the tax today is usually trivial, and the alternative is paying ordinary income tax on your own company’s growth for years. Few financial decisions this small carry a payoff this large.

Frequently Asked Questions

What is the 83(b) election deadline? Thirty days from the date the stock is transferred to you (the grant or early-exercise date). It is a hard statutory deadline with no extensions and no reasonable-cause relief. Count calendar days and file early.

Does the IRS confirm they received my 83(b) election? No. If you file on paper, the IRS sends no acknowledgment, so your certified-mail receipt and a copy of the signed election are your only proof. Keep them until well after you sell your shares. Filing electronically via Form 15620 on IRS.gov gives you instant confirmation instead.

How does an 83(b) election affect taxes at exit? It converts what would have been ordinary income on vesting into long-term capital gain measured from the grant date, taxed at a lower rate and only when you sell. It can also start your Section 1202 (QSBS) five-year clock earlier, potentially excluding a large portion of gain from federal tax at exit.

What happens if I miss the 83(b) deadline? The election is permanently lost, and you default to being taxed at ordinary rates as the stock vests, often on gains you cannot yet access. Talk to a tax advisor about your options, but the better answer is to never miss the 30-day window.

Do I need an 83(b) election for regular stock options? Not for unexercised options. It becomes relevant when you early-exercise unvested options or receive restricted stock subject to vesting, because then you hold property subject to a risk of forfeiture.

If you want to talk through how this applies to your company, book a call.

Anelya Grant is the founder of AG Accounting (AG Grant, Inc.), an accounting firm serving tech startups and healthcare organizations. She is also co-founder of JustPaid.ai, an AI-powered billing and contract-to-cash platform for growing companies.