The 83(b) Election: The 30-Day Decision Every Founder Must Get Right

When a founder receives stock subject to vesting, the default tax rule is brutal: you are taxed as each tranche vests, at ordinary income rates, on the fair market value at that moment. If your company grows, every vesting date becomes a tax event on an increasingly valuable asset — with no cash to show for it.

An 83(b) election flips that default. By filing it, you choose to be taxed today on the stock's current value rather than as it vests. At formation, founder stock is typically worth a fraction of a cent per share — so the tax due at filing is usually trivial or zero.

From that point on, all future appreciation is capital gain, not ordinary income, and your capital gains holding period starts immediately — not years later when the last tranche vests.

The election must be filed with the IRS within 30 days of the stock grant. Not 31. There is no extension, no reasonable-cause relief, and no way to cure a missed deadline. This is one of the few areas of tax law with genuinely zero flexibility.

The IRS now provides a standardized form for the election — Form 15620 — which has simplified what used to be a write-your-own-letter exercise. File it, keep proof of timely mailing, retain a copy with your permanent records, and give a copy to the company.

If you formed your company recently and have not addressed this, check your grant date today. If you are inside the 30-day window, this belongs at the top of your to-do list.

For founders receiving stock at or near formation, filing is almost always the right call: the value is nominal, so the cost of electing is near zero and the upside is the entire future appreciation taxed as capital gain.

The analysis changes when the stock already has real value — a later-stage employee receiving restricted stock, for example. Electing means paying ordinary income tax now on value you might forfeit if you leave before vesting. If you forfeit, you do not get that tax back. The decision then becomes a bet on the company, your tenure, and the spread between today's value and your exit expectations.

This is exactly the kind of decision worth one hour with a tax advisor before the 30-day window closes — not after.

For C-Corp founders, the 83(b) election pairs with one of the most generous provisions in the tax code: Qualified Small Business Stock (Section 1202). And QSBS got significantly better under the One Big Beautiful Bill Act of July 2025.

For stock issued after July 4, 2025, the lifetime exclusion cap rose from $10 million to $15 million (or 10x basis, whichever is greater), the company-size limit rose from $50 million to $75 million in gross assets, and the all-or-nothing five-year holding requirement became tiered: 50% exclusion after three years, 75% after four, and 100% after five.

Here is the connection: your QSBS holding period starts when you own the stock for tax purposes. A timely 83(b) election starts that clock at grant. Without it, the clock starts as shares vest — potentially delaying your 100% exclusion by your entire vesting schedule.

The 83(b) analysis applies to anyone receiving equity subject to vesting: early startup employees with restricted stock, advisors compensated in equity, and partners receiving profits interests (which have their own parallel election mechanics).

International founders face an extra layer: an 83(b) election is a U.S. tax concept, and your home country may tax the same equity on a completely different schedule. Cross-border founders should coordinate both systems before filing — the optimal U.S. move is occasionally the wrong global one.

If you are forming a company and issuing founder stock subject to vesting, file the 83(b) election within 30 days — the cost is minutes of paperwork and the benefit can be measured in percentage points of your entire exit.

If the equity already has meaningful value, get a professional analysis before the window closes. Either way, the worst outcome is not choosing wrong — it is discovering the deadline existed after it passed.