The 83(b) Election, Explained for Founders

The 83(b) election is one of those startup details that sounds like obscure tax trivia until you realize a missed 30-day window can cost a founder tens of thousands of dollars years later. It's a single page. It's free to file. And for most founders with vesting stock in a US company, not filing it is a genuine, avoidable mistake.

The reason it matters comes down to when you get taxed on equity that vests over time — now, when the shares are nearly worthless, or later, when they might be worth a fortune. The 83(b) election lets you choose "now," which is almost always the founder's friend.

This guide explains what the election is, why it helps, the deadline you cannot miss, and exactly how to file it. (One caveat up front: this is general information for US companies, not tax advice — confirm the specifics with a qualified advisor.)

What the 83(b) election actually does

When you get equity that vests over time, the tax authorities treat each chunk as income when it vests, based on the share value at that moment. That's fine if the shares stay cheap. It's a disaster if the company grows: as your shares vest each year at a higher and higher valuation, you owe ordinary income tax on the increase — on paper gains you usually can't sell to pay the bill.

The 83(b) election flips this. By filing within 30 days of the grant, you elect to be taxed on the entire grant up front, at its value on the grant date. For a founder who buys their stock at incorporation, that value is typically a fraction of a cent per share — so the tax is near zero. You've effectively pre-paid (almost nothing) and removed the future tax-as-it-vests problem entirely.

This connects directly to how startup vesting and cliffs work: vesting is what creates the tax timing question in the first place, and the 83(b) election is the standard answer to it.

Two more benefits founders miss

Beyond avoiding the escalating annual bill, filing an 83(b) does two valuable things:

• It starts the long-term capital gains clock immediately. When you eventually sell, gains held long enough are taxed at the lower capital-gains rate rather than as ordinary income. Filing at grant starts that clock on day one for all your shares.
• It simplifies your tax life. Without the election, you have a taxable event every vesting period. With it, you have one event at grant and nothing until you sell. Cleaner records, fewer surprises.

30 days

The deadline you cannot miss

Here is the part to tattoo on the inside of your eyelids: you have 30 days from the grant or purchase date to file. There are no extensions. There is no appeal. There is no after-the-fact fix.

Miss it, and you're locked into being taxed as the shares vest. If your startup does well, that's potentially a large, growing tax liability on illiquid stock. This is why experienced founders treat the 83(b) filing as one of the first things they do after incorporating and issuing founder stock — not something to "get to next month."

How to file an 83(b) election

The mechanics are genuinely simple. The discipline is in doing it fast.

1. Confirm you have restricted stock with vesting

   The election is for stock you own that's subject to a vesting/repurchase schedule (classic founder shares), or for an early exercise of options. If you only hold unexercised options, talk to your advisor about whether an early exercise plus 83(b) makes sense.

2. Complete the one-page statement

   Fill out the standard 83(b) statement with your details, a description of the shares, the grant date, the fair market value at grant, and the amount you paid. Most startup lawyers and cap-table tools provide a template.

3. Mail it within 30 days

   Send it to the correct IRS office, ideally by certified mail with return receipt, so you have proof of the postmark date. Timely mailing is what counts.

4. Keep copies everywhere

   Save a copy for your records, give one to your company, and retain the mailing receipt. You may need to prove you filed years later when you sell.

Because the equity touches your cap table and your co-founders' shares, it's worth filing together as a founding team so no one's window slips. And if your early employees receive restricted stock too, make sure they know — the rules apply to them just as much as to you, alongside how employee stock options are handled.

The bottom line

The 83(b) election is a free, one-page filing that, for most founders with vesting stock, prevents a large future tax problem and starts the capital-gains clock early. The only hard part is the 30-day deadline — which is absolute and unforgiving. File it the moment your founder stock is issued, send it certified, keep proof, and confirm the details with a tax advisor.

If you're setting up your company and equity from scratch, read it alongside how to incorporate a startup and how vesting works, and when you're building your founding team, you can find co-founders on Foundersbase.