Of all the deadlines in a startup's first year, this is the one with the least forgiving consequence and the shortest window. It is not a filing you can catch up on, there is no general relief for missing it, and the cost of missing it does not appear until years later, usually in the year you finally have a liquidity event and least want a surprise.
An 83(b) election tells the IRS to tax restricted stock now, at the moment it is granted and while it is worth almost nothing, rather than at each vesting date as it becomes valuable. It must be filed no later than 30 days after the property is transferred.
What the election actually does
Founder and employee stock is usually subject to vesting, which means it can be forfeited if you leave. Under IRC section 83, property transferred in connection with the performance of services is taxed when it is no longer subject to a substantial risk of forfeiture, which is to say as it vests, at its value on each of those dates.
For a company whose value is rising, that is an expensive default. Each vesting tranche is taxed as ordinary income at whatever the stock is worth that month, on shares you cannot sell to pay the tax. The 83(b) election moves the whole calculation to the grant date.
| Without an 83(b) | With an 83(b) | |
|---|---|---|
| When you are taxed | At each vesting date | Once, at grant |
| Value taxed | Whatever the stock is worth on each vesting date | Value at grant, typically near zero |
| Character | Ordinary income at each tranche | Ordinary income once, then capital gains treatment on later appreciation |
| Capital gains clock | Starts at each vesting date | Starts at grant |
| Cash needed at vesting | Tax due on illiquid shares | None from the election itself |
The second and third rows are what founders actually care about. Filing at grant, when the stock is worth almost nothing, usually means a tiny or zero tax bill today, and it starts the capital gains holding period years earlier than it would otherwise begin.
The deadline, precisely
The election must be made no later than 30 days after the date the property is transferred. If the thirtieth day falls on a Saturday, Sunday, or legal holiday, the election is timely if postmarked the next business day.
Two details are worth being exact about. The clock runs from the transfer of the property, not from when you signed a term sheet, remembered to ask, or received a stock certificate in the post. And there is no general late relief, so an election filed on day 31 is not a late election, it is no election at all.
The IRS now publishes Form 15620 for making the election. Using it is voluntary and a written statement remains acceptable, but a standard form removes one of the more common failure modes, which is a home-made statement missing a required element.
When it is the wrong call
The election is not free of risk, and the standard advice to always file it is too simple. You are choosing to pay tax now on stock you may never own.
- You leave before vesting. You have paid tax on shares you forfeit, and there is no mechanism to unwind the election or recover that tax.
- The company fails. Same outcome. The tax you paid at grant does not come back because the shares became worthless.
- The election is irrevocable, so the decision cannot be revisited once the window closes in either direction.
- If the stock already has meaningful value at grant, the tax due today can be real rather than nominal, which changes the calculation entirely.
In practice, the reason the election is so widely recommended at formation is that founder stock at incorporation is usually worth close to nothing, which makes the downside a rounding error and the upside potentially very large. The further you are from formation, the more the arithmetic deserves actual attention rather than a default.
Why it matters for QSBS
There is a second-order effect that rarely gets mentioned alongside the election, and it can be worth more than the income tax saving. Qualified small business stock treatment under section 1202 turns on how long you have held the stock, and the holding period follows from when the stock is treated as acquired.
For restricted stock, an 83(b) election is what starts that clock at grant rather than at vesting. On stock acquired after 4 July 2025, the tiered exclusion begins at three years, so starting the clock earlier can move an exit inside a tier it would otherwise miss. See what the 2025 QSBS changes actually say for the current tiers and caps, and note that whether a given company is even eligible is a separate question with a long list of excluded business types.
How to actually file it
- Fix the transfer date. This is the date the clock runs from, and it is the fact most often reconstructed wrongly after the event.
- Prepare the election, either on Form 15620 or as a written statement containing everything section 83(b) requires.
- File it with the IRS within 30 days of transfer. Send it in a way that produces dated proof of mailing, because proving timeliness later is the whole game.
- Give a copy to the company for its records.
- Keep your own copy permanently. You may need to evidence this a decade later at an exit, long after the original correspondence has been lost.
The proof-of-mailing step is the one people skip and later regret. An election you cannot demonstrate you filed on time is functionally an election you did not make, and the person who will ask for evidence is a buyer's tax counsel during diligence.
Where Zinance fits
Equity events touch your books, your cap table and your tax position at once, which is why they fall between providers when those are three different vendors. Zinance keeps bookkeeping and tax with one team, so a grant, an election and the accounting that follows are handled together rather than discovered at year end. Whether an 83(b) election suits your own facts is a question for your advisor, and it is worth asking at formation rather than in month two.
This article is educational and general, not tax, legal, or accounting advice, and it creates no client relationship. Whether to make an 83(b) election depends on facts specific to you, your company and your state, and the election is irrevocable with no general late relief. Consult a qualified tax professional before deciding or filing.