83(b) Election — The Founder's Complete Guide to Filing Within 30 Days

The 83(b) election is a one-page tax form with a 30-day filing window that can be worth millions of dollars at exit. It is also one of the most frequently missed opportunities in startup and early-stage company planning — because it requires action immediately after a grant, before most founders have thought about the tax implications of their equity.

What the Default Tax Treatment Costs You

Without an 83(b) election, restricted stock is taxed when restrictions lift at vesting — at the stock's value at vesting, not at grant. If 500,000 shares are worth $0.10 at grant and $15 at vesting four years later, the default creates $7.5 million of ordinary income at vesting — taxed at up to 37% federal. On stock that may not yet be liquid.

What the 83(b) Election Does

Filing within 30 days of the grant elects to recognize income at the grant date value — typically near zero for early-stage companies. Pay ordinary income tax now on $0.10 per share (often a total tax of a few hundred or few thousand dollars). All future appreciation — from $0.10 to $15 to $100 — is then capital gains, taxed at the lower rate when you eventually sell.

The math: 500,000 shares at $0.10 = $50,000 of ordinary income = approximately $18,500 in federal tax. Without the election: $7,500,000 of ordinary income at vesting = approximately $2.775 million in federal tax. Same company, same shares, same outcome — $2.756 million difference from a one-page form filed within 30 days of grant.

The QSBS Connection — Start the Clock at Grant

Section 1202 QSBS exclusion allows qualifying C corporation shareholders to exclude up to $15 million of capital gains from federal income tax after a 5-year holding period. The holding period begins at the date of acquisition — which, with an 83(b) election, is the grant date.

Without the 83(b) election, each vesting tranche starts its own QSBS clock. A founder with a 4-year vest who does not file the 83(b) might need to hold for 9 years from founding before the last shares reach full exclusion. With the 83(b), all shares start the clock on day one — potentially reaching full exclusion years earlier, at a time when an exit is more likely.

Who Should Always File the 83(b)

• Founders receiving restricted stock at incorporation — file immediately, the same week as incorporation if possible. Tax cost is near zero; benefit is potentially enormous.
• Early employees receiving restricted stock grants with meaningful vesting schedules — especially at companies with realistic growth trajectories.
• Anyone receiving restricted interests in a partnership or LLC — the Section 83(b) concept applies to these as well, though the mechanics differ.

The question is not whether to file — for any early-stage company with growth potential, the answer is almost always yes. The question is whether you will do it within 30 days. That is a calendar management question, not a tax strategy question.