The 30-Day Founder Stock Audit: File an 83(b) Before Gains Become Ordinary Income

The deadline is the trap

You just received restricted founder stock. The trap is the 30-day IRS deadline, which generally runs from the restricted stock grant.

The rule is plain. A Section 83(b) election shifts the initial tax point from vesting to grant. That is the whole reason the first month deserves a whiteboard, not a shrug.

Only vesting stock, not fully vested stock, can be covered by a Section 83(b) election. If the shares are already fully vested, the election is not the right tool. The audit exists to catch the shares that are still on a vesting clock before the paperwork buries that fact.

The checklist is a cap-table audit

Keep the list short. Each item is a yes/no check you can finish quickly. You are deciding whether these shares are covered, when the deadline started, and what the tax path looks like if you do nothing.

• Confirm the shares are restricted and vesting, not fully vested.
• Identify the grant date and 30-day deadline.
• Check the stock purchase agreement and cap table for covered shares.
• Compare ordinary income at vesting with capital gains on appreciation.
• File only for covered stock, noting profits interests may be treated differently.

The list keeps you from filing for uncovered shares, missing the clock, or working from a cap table that does not match the agreement. It also forces the comparison that makes the election worth it and keeps you from treating a profits interest like corporate stock.

Start with the stock purchase agreement. It should say whether the shares are restricted and what condition must be met before you own them free of that restriction. The cap table should show the same shares, the same holder, and the same start date. If the two documents disagree, stop and ask for the corrected record before you decide anything.

The checklist is a fact check. It tells you which shares are in play, which date started the clock, and which documents need to line up. If one item fails, the next step is to fix the record or get advice, not to file on a guess.

The rate gap is the reason to act

In 2025, the top U.S. federal ordinary income rate was 37%, while the top long-term capital gains rate was 20% before the 3.8% net investment income tax.

That spread is the reason the audit matters. The audit asks whether the stock's value at vesting is likely to be higher than its value at grant.

Say you receive restricted shares at a low grant value and they rise before vesting. If you do not make the election, Section 83 makes the stock's fair market value compensation income when it vests. The later increase is the part you want to keep out of ordinary income.

The numbers size the prize, but they do not guarantee savings. If the stock is worth the same at vesting as at grant, the election may not change much. If it is worth more, the comparison gets sharper. Write down the grant value, the current value, and the vesting date. The audit is easier when the numbers are in front of you.

The election has limits

Profits interests are different. For profits interests, Rev. Proc. 2001-43 removes the need for a Section 83(b) election to obtain the non-taxable treatment that corporate stock would require. In plain terms, the profits interest can get the same result without the filing. If your grant is a profits interest, check that label before you file.

The label matters because the filing that helps corporate stock may not be the right move for a partnership-style interest. The audit should name the instrument, the holder, and the vesting condition before anyone decides to file.

In June 2025, the IRS started accepting e-filed Section 83(b) elections for certain cases. It changes how you deliver the election. The decision to make one still belongs to you. If the filing method is available to you, use it, but keep the deadline in front of you.