For most founders receiving vesting stock, this is one of the most consequential tax decisions you will make. The window is 30 calendar days. Missing it is unfixable.
When a founder receives restricted stock subject to vesting, the IRS default position is that the stock is taxed as ordinary income at each vesting event, based on the fair market value of the shares at the time they vest. For a startup that grows significantly between grant and vesting, this can mean owing substantial ordinary income tax on shares the founder has not sold, with no cash to pay it.
The 83(b) election is how founders avoid that outcome. It allows you to elect to be taxed on the full grant at the time of the grant, when the shares are worth almost nothing, rather than at each vesting event when they may be worth significantly more. Future appreciation is then characterized as capital gain rather than ordinary income when the shares are eventually sold.
The election must be filed within 30 calendar days of the stock transfer. There are no exceptions to this deadline and no mechanism to make a late election regardless of the circumstances.
Why the default tax treatment creates a problem
IRC Section 83 governs the tax treatment of property received in exchange for services. Under the default rules, restricted stock is not taxed at grant. Instead, at each vesting event, the founder recognizes ordinary income equal to the fair market value of the vesting shares at that time minus the amount originally paid. That income is taxed at ordinary income rates, which currently go up to 37% at the federal level.
For a founder who received stock when the company was worth almost nothing, this creates a specific problem. The value of the stock at vesting reflects the company’s growth since the grant date. That growth shows up as ordinary income, taxable in the year of each vest event, whether or not any shares have been sold. In a year when a priced round closes and the share value jumps, the tax bill from vesting can be significant, and it arrives without any corresponding cash event to fund it.
The 83(b) election solves this by collapsing the tax event to the date of the original grant. If the shares are worth next to nothing at grant, the taxable income at the election date is near zero. All subsequent appreciation is then capital gain rather than ordinary income, taxed at the lower long-term capital gains rates when the shares are eventually sold.
What the difference looks like in dollars
The following example illustrates the stakes. A founder receives 1,000,000 restricted shares at $0.001 per share, paying $1,000 total, subject to a four-year vesting schedule with a one-year cliff. The company raises a Series A at $1.00 per share eighteen months later. The company is acquired at $5.00 per share after four years.
Without the 83(b) election
At each vesting event, the founder recognizes ordinary income equal to the fair market value of the vesting shares at that time minus the original purchase price. As shares vest at approximately $1.00 per share following the Series A, the founder recognizes approximately $999,000 of ordinary income. At a 37% federal rate, that is approximately $369,630 in tax.
This tax is due in the year the shares vest. The founder has not sold anything. The gain exists on paper but the tax bill is cash, and it has to come from somewhere, whether personal savings, a loan, or a secondary sale. For many founders, this is the moment the absence of an 83(b) election becomes a real problem rather than a theoretical one.
If the company is then acquired at $5.00 per share, the remaining gain is $4.00 per share above the vesting price. On 1,000,000 shares, that is $4,000,000 of additional gain, taxed at long-term capital gains rates of approximately 20%, producing approximately $800,000 in additional federal tax.
Total federal tax through exit without the 83(b) election: approximately $1,169,630.
There is a further risk worth naming. The $369,630 vesting tax is owed whether or not the company ever exits. If the company raises at a high valuation in year two, triggers a large vesting tax, and then fails or stagnates in years three and four, the founder has paid substantial tax on gains that never materialized into cash. This is the scenario that makes the absence of an 83(b) election genuinely costly rather than just tax-inefficient.
With the 83(b) election
The founder elects to be taxed at the grant date. Fair market value at grant is approximately $1,000, equal to the purchase price, so taxable income is approximately zero. Tax at grant: approximately $0.
No ordinary income is recognized at any subsequent vesting event. The entire appreciation from $0.001 to $5.00 is treated as capital gain from the grant date forward.
At exit with the company acquired at $5.00 per share, the total gain is approximately $4,999,000. At a 20% long-term capital gains rate, federal tax is approximately $999,800.
Total federal tax through exit with the 83(b) election: approximately $999,800.
The comparison
| Without 83(b) | With 83(b) | |
|---|---|---|
| Tax at grant | $0 | ~$0 |
| Tax at vesting (ordinary income) | ~$369,630 | $0 |
| When vesting tax is due | Before exit, in cash | Not applicable |
| Tax at exit (capital gains) | ~$800,000 | ~$999,800 |
| Total federal tax through exit | ~$1,169,630 | ~$999,800 |
| Net saving from filing 83(b) | ~$169,830 |
The net federal tax saving from filing the 83(b) election in this example is approximately $169,830. But the dollar saving understates the full picture. Without the election, approximately $369,630 of that total tax bill is due before any exit, in cash, on gains that may never result in liquidity. With the election, the entire tax bill is deferred to the exit event when there is actual cash to pay it.
These figures are illustrative and use simplified assumptions. Actual results depend on the vesting price at each event, the founder’s other income, filing status, state taxes, and the specific timeline of the company’s growth. The example assumes all shares vest at $1.00 following the Series A, which simplifies the calculation. In practice, vesting occurs monthly and the fair market value at each vest date varies.
The 30-day deadline: the most important thing in this blog
The 83(b) election must be filed no later than 30 calendar days after the date the property is transferred. For restricted stock, that is the actual stock issuance date: not the incorporation date, not the date employment begins, and not the date shares vest.
If the 30th day falls on a Saturday, Sunday, or legal holiday, the deadline extends to the next business day under IRC Section 7503. In all other cases, 30 calendar days means exactly 30 calendar days.
The IRS does not routinely grant relief for late elections. An honest mistake, a founder’s lack of awareness, a cap table platform’s failure to send a reminder, or a lawyer’s oversight generally does not create an exception. Founders who have already missed the deadline should consult a startup tax attorney immediately, but should not assume the situation can be repaired. In almost all cases it cannot.
The single most effective practice is to calculate day 30 on the day the stock is transferred and treat that date as a hard deadline from that moment forward.
How to file the 83(b) election
In late 2024, the IRS released Form 15620, the official Section 83(b) Election form. This is now the most practical filing option because it standardizes the required information and eliminates ambiguity about what the election statement must contain.
As of 2025, the IRS offers an electronic filing option for Form 15620 through its online portal. The filer creates or logs into an IRS account using ID.me verification, completes the online interview, submits the form, and saves the confirmation as proof of timely filing.
For founders who need to file by mail, a compliant written statement prepared under Revenue Procedure 2012-29 remains acceptable. The statement must include the following information: your name, address, and taxpayer identification number; a description of the property (number and class of shares, company name and EIN); the date of transfer and the taxable year for which the election is made; the nature of the restriction on the shares; the fair market value at the time of transfer; and the amount paid.
Step-by-step filing process
- Confirm the actual stock transfer date from the stock purchase agreement, board consent, or cap table record.
- Calculate day 30 immediately.
- Gather the required information listed above.
- Complete Form 15620 or prepare a compliant written statement.
- File electronically through the IRS portal, or mail to the IRS office where you file your federal income tax return.
- If mailing, use certified mail with return receipt to create proof of timely filing.
- Provide a copy to the company, which needs it for its own records.
- Save all documentation permanently.
One important update worth noting: Revenue Procedure 2012-29 eliminated the old requirement to attach a copy of the 83(b) election to your income tax return. Many checklists still include this step because it was required under prior guidance. It is no longer required, but retaining the election in your records and giving a copy to the company remains essential.
Should Indian founders and non-US taxpayers file the 83(b) election?
An Indian-resident founder who is a non-resident alien for US tax purposes may not have a US tax filing obligation simply from receiving stock in a Delaware C-Corp. Whether a US filing obligation exists depends on facts including whether services are performed in the US, the founder’s tax residency, and other considerations specific to their situation.
Despite the absence of an immediate US tax obligation, most advisors recommend that non-US founders file a timely 83(b) election. The reason is preventive.
If the founder later moves to the US and becomes a US taxpayer while shares are still vesting, future vesting events can create ordinary income under Section 83 that the election would have prevented. A timely election fixes the US tax timing at the original transfer date rather than at vesting, which means future vesting events do not generate ordinary income regardless of when the founder’s US tax residency begins.
Filing the election when the taxable amount is near zero has essentially no negative consequence. Not filing it and later becoming a US taxpayer before full vesting is an outcome that cannot be remedied.
There is a practical complication. Form 15620 requests a taxpayer identification number, and the electronic filing route requires IRS online account verification. A non-resident founder without a Social Security Number or ITIN will need specific advice on paper filing, cover letter documentation, and how to handle the TIN field. This is an area where one-size-fits-all guidance is not appropriate; the right approach depends on the founder’s specific facts and advisors familiar with international tax should be consulted.
Restricted stock versus options: an important distinction
The 83(b) election applies to restricted stock, meaning actual shares transferred to the founder that remain subject to a substantial risk of forfeiture because the company can repurchase unvested shares if the founder leaves. It does not apply to unexercised stock options, which are a right to purchase shares in the future rather than an actual transfer of property.
Early-exercise options are a different situation. If a founder exercises a stock option early and receives unvested shares in exchange, that share transfer is an actual property transfer that may be eligible for an 83(b) election. The 30-day clock begins on the date of the share transfer upon early exercise, not on the date the option was originally granted.
One risk worth understanding: if a founder files the 83(b) election and later forfeits unvested shares by leaving the company, the ordinary income recognized at the election date is generally not recoverable. The loss deduction available on forfeiture is limited to the amount actually paid for the forfeited shares, not the income previously accelerated by the election. This is why the election is most compelling when the shares are worth very close to the purchase price at the time of grant.
The QSBS connection: one more reason to file
Filing the 83(b) election matters not only for managing ordinary income tax but also for preserving Qualified Small Business Stock eligibility under IRC Section 1202. A dedicated blog covering QSBS in full, including the changes introduced by the One Big Beautiful Bill Act, is available here.
The QSBS five-year holding period generally begins when the stock is acquired. For restricted stock, a timely 83(b) election causes that clock to start at the grant date, covering the entire share grant from a single acquisition date. Without the election, individual vesting events can create separate acquisition dates for each tranche of shares as they vest. Each tranche then has its own five-year holding period, potentially delaying QSBS eligibility for portions of the stock.
For a founder on a four-year vesting schedule, the difference between a single acquisition date at grant versus staggered acquisition dates at each monthly vest can mean the difference between QSBS eligibility on the full holding and eligibility only on the earlier tranches at the time of exit. This is a meaningful consideration for founders with significant equity in companies that may qualify for QSBS treatment.
Common mistakes worth avoiding
Counting 30 business days rather than 30 calendar days is the single most common scheduling error and it produces a missed deadline.
Starting the clock from the vesting date, the fundraising date, or the incorporation date rather than the actual stock transfer date is a related error that catches founders off guard, particularly when there is a gap between incorporation and the formal stock issuance.
Assuming the incorporation platform or the company’s legal counsel files the election on the founder’s behalf. The responsibility for filing lies entirely with the recipient, not the company. Platforms may remind founders; they do not file on their behalf.
Filing the election but failing to save proof of submission. If the IRS ever questions whether the election was timely, proof of the filing date is the only defense.
Assuming the election is unnecessary because the current taxable income is near zero. The value of the election is not the current tax saving; it is the characterization of future appreciation as capital gain rather than ordinary income.
Assuming that non-US tax status makes the election irrelevant. The timing risk created by future US residency makes early filing the prudent choice for most non-US founders receiving vesting stock in a US entity.
Sources: IRC Section 83; IRS Form 15620, Section 83(b) Election; IRS Revenue Procedure 2012-29; IRC Section 7503; IRC Section 1202, QSBS.
The 83(b) election is one of the few startup tax decisions with a hard deadline that cannot be extended and consequences that cannot be undone. Every situation is different, and the right approach for a non-US founder in particular depends on facts that require individualized advice. This blog is intended as a general guide and should not be relied upon as legal or tax advice for your specific circumstances. If you have recently received or are about to receive vesting stock and want to make sure the election is handled correctly, reach out to Numera before day 30.