When a founder receives restricted stock, a strict clock begins. From the date the shares are transferred, there are exactly 30 calendar days to file a Section 83(b) election with the IRS. There is no extension, no appeal process, and no opportunity to correct a missed filing. Founders who fail to make this one-page filing have faced six- and seven-figure tax liabilities as their company’s value increased through subsequent funding rounds. This guide explains how the 30-day deadline works, how to file correctly in 2026, and the mistakes that affect even well-advised founders.
What Is an 83(b) Election?
A Section 83(b) election is a brief notice filed with the IRS stating that you elect to be taxed on your restricted stock immediately, at its current fair market value, rather than later as it vests. To understand why this one-page filing matters so much, it helps to compare the default tax treatment with what the election accomplishes.
How Restricted Stock Is Taxed by Default
By default, the IRS taxes restricted stock as it vests, and it taxes the value on each vesting date as ordinary income. If your shares are worth a fraction of a cent at grant but $5 per share by the time they vest, you owe ordinary income tax on that appreciation, often without any ability to sell shares to cover the liability. The tax bill grows with every vesting date as the company appreciates.
What Changes When You File the Election
A valid 83(b) election reverses that outcome in three important ways:
- You pay tax once, based on the typically minimal value at grant. If you paid full fair market value for your founder shares, your taxable income is often zero.
- All future appreciation is taxed as capital gains upon sale, rather than as ordinary income at each vesting date.
- Your capital gains holding period and your QSBS (Section 1202) clock begin at grant, which can eventually exclude a substantial portion of your gain from federal tax.
The 30-Day Deadline: How It Works
The deadline is the least forgiving element of the election. The IRS has no discretion to accept a late filing, so understanding exactly how the 30 days are counted is essential.
When the Clock Starts
The 30-day period begins on the date the stock is transferred to you, typically the date you sign your restricted stock purchase agreement and the shares are issued. It does not start on the date the board approved the grant or the date you reviewed the documents.
Calendar Days, Weekends, and Holidays
The period is measured in 30 calendar days, not business days, so weekends and holidays are included in the count. One exception applies: if the thirtieth day falls on a Saturday, Sunday, or legal holiday, the election is timely if filed by the next business day. A filing on day 31 in any other circumstance is invalid, and no extension is available.
Proof of Timely Filing
For paper filings, the mailing date controls. Under the IRS “timely mailed, timely filed” rule, a paper election postmarked within the 30-day window is considered timely. Use USPS Certified Mail with a return receipt to establish proof. For electronic filings, the online submission timestamp serves as your record.
Why You Should File in Week One
Do not plan around day 30. File within the first week, before travel, mail delays, or other business demands place the deadline at risk. Coordinating the filing with your attorney and a startup accounting advisor at the time of incorporation is the most reliable way to ensure it is not overlooked.
How to File an 83(b) Election in 2026
The filing process has been simplified in recent years. In late 2024, the IRS released Form 15620, a standardized 83(b) election form, and in 2025 it began accepting online filing through IRS.gov. The process now involves five steps.
Step 1: Confirm Your Transfer Date and Deadline
Verify the date the shares were transferred to you and calculate the exact 30-day deadline before doing anything else. Every subsequent step depends on this date being correct.
Step 2: Complete Form 15620
Fill out Form 15620 with your name, taxpayer identification number, a description of the shares, the transfer date, the fair market value at transfer, and the amount you paid for the shares.
Step 3: Submit Online or by Mail
File using one method only. Online filing is preferred: log in to your IRS online account through ID.me, complete Form 15620 on the IRS website, and submit. You receive immediate, timestamped confirmation of receipt. Alternatively, mail the signed election to the IRS office where you file your tax return, postmarked within 30 days, via Certified Mail with return receipt.
Step 4: Provide a Copy to Your Company
This step remains required even for electronic filings. Your company needs the copy to meet its payroll and tax reporting obligations.
Step 5: Retain Your Records Permanently
Keep the filed form, proof of filing (online confirmation or certified mail receipt), and your stock purchase documents. Investors and acquirers routinely request these documents during tax due diligence.
What the Election Saves: An Illustrative Example
Assume you are granted 1,000,000 founder shares at $0.001 per share ($1,000 total), vesting over four years. The difference between filing and not filing is substantial.
With a Timely 83(b) Election
You paid fair market value, so you recognize no income at grant. When you sell years later at $10 per share, the entire gain is long-term capital gain, and potentially excludable under QSBS.
Without the Election
As shares vest and the company’s value grows, for example to $2 per share in year two, you owe ordinary income tax on hundreds of thousands of dollars of paper income on shares you cannot sell. The tax liability compounds at every vesting date. For founders and early employees evaluating option exercises alongside stock grants, the same timing considerations apply to early-exercised options, an area where AMT and ISO exercise planning is equally important.
7 Costly 83(b) Mistakes Founders Make
Even founders with strong legal and financial support make errors with this election. These are the seven most common and most expensive.
1. Counting the 30 Days from the Wrong Date
The period begins at stock transfer, not at board approval, your start date, or the date your attorney sent you the documents. Miscounting the start date is the most frequent cause of invalid elections.
2. Waiting Until the Final Week to File
Mail delays, missing signature pages, and competing business priorities have invalidated many elections. File in the first week to leave room for the unexpected.
3. Filing Without Proof
If the IRS ever questions your election, an unsupported recollection of mailing it will not suffice. File online for immediate confirmation, or use Certified Mail with return receipt.
4. Failing to Provide a Copy to the Company
This required step is frequently overlooked and creates payroll reporting problems later. Deliver the copy promptly after filing.
5. Assuming the Election Applies When It Does Not
An 83(b) election is relevant only for stock subject to vesting. Fully vested shares do not require one, and standard (non-early-exercised) stock options cannot use one until exercise.
6. Reporting an Incorrect Fair Market Value
An unsupportable value at grant can create issues in an audit and during due diligence. Coordinate with your company’s most recent 409A valuation before completing the form.
7. Treating the Election as a Single Event
New grants, refresh grants, early-exercised options, and advisor shares each require their own election, and every new tranche of restricted stock begins a new 30-day period. The election should be part of an ongoing equity compensation planning strategy rather than a one-time task.
What If You Miss the 30-Day Deadline?
A genuinely missed deadline cannot be cured. Before concluding the opportunity is lost, however, it is worth confirming whether the deadline was actually missed, and if it was, understanding the planning options that remain.
First, Verify Whether You Actually Missed It
Three questions determine whether your election may still be valid. Was the postmark within 30 days? A timely mailed election is timely filed. Did day 30 fall on a weekend or holiday? The deadline extends to the next business day. Do you have proof of an online submission? Electronic confirmations are timestamped and serve as evidence of timely filing.
Mitigation Options After a Missed Deadline
If the deadline has truly passed, the focus shifts to damage control. In limited circumstances, a company may cancel and reissue grants, a step with real legal and tax risk that requires professional guidance. Alternatively, future grants can be structured as fully vested shares, and proactive pre-IPO tax planning can help manage the vesting-date tax liabilities that can no longer be avoided.
Should Every Founder File an 83(b) Election?
In most cases, yes, but the election is not automatic for every situation. The decision depends on the share value at grant, your confidence in the company, and your expected tenure.
When the Election Makes Sense
The election is most advantageous when the current share value is very low, as is typical at incorporation, so the upfront tax is minimal or zero; when you expect the company to appreciate in value; and when you expect to satisfy your vesting schedule.
When Closer Analysis Is Warranted
The election deserves careful review if the shares already carry significant value, since the upfront tax may be substantial, or if there is a meaningful possibility you will depart before vesting. Tax paid on forfeited shares is generally not refundable. This decision is worth discussing with a CPA who works with venture-funded startups before signing your stock purchase agreement.
The Bottom Line
The 83(b) election is one of the highest-leverage, lowest-cost decisions available to a startup founder: a one-page filing that can convert years of ordinary income into capital gains and preserve QSBS eligibility. It is also entirely unforgiving: 30 days, one opportunity, no extensions. File early, file with proof, provide your company a copy, and retain your records.
If you have recently received founder shares, are early-exercising options, or want a professional review of your equity strategy, Capital Tax’s team specializes in 83(b) elections and equity tax planning for founders. Contact us before your 30-day window closes, not after.
Frequently Asked Questions
How long do I have to file an 83(b) election?
Exactly 30 calendar days from the date the restricted stock is transferred to you. If day 30 falls on a weekend or legal holiday, the deadline moves to the next business day. No extensions are available.
Can I file an 83(b) election online?
Yes. Since 2025, the IRS has accepted electronic filing of Form 15620 through its website, with login through ID.me. Online filing provides immediate, timestamped proof of submission. Paper filing by Certified Mail remains an option, but only one method should be used.
Do I still need to attach the election to my tax return?
No. That requirement was eliminated several years ago. You file with the IRS within 30 days, provide a copy to your company, and retain records.
What happens if I never file an 83(b) election?
Your restricted stock is taxed as ordinary income at each vesting date based on its then-current value, often creating substantial tax liabilities on shares you cannot sell, and converting what could have been capital gains into ordinary income. If the IRS later disputes the tax treatment of your shares, experienced IRS representation can help resolve the matter.
Does an 83(b) election affect QSBS?
Yes, favorably. A timely election starts your Section 1202 holding period at grant rather than at vesting, helping you satisfy the QSBS holding requirement sooner and potentially excluding a substantial portion of your gain from federal tax.
Is an 83(b) election refundable if I leave before my shares vest?
Generally, no. If you forfeit unvested shares, you cannot recover the tax paid on them. This is one reason the election is most appropriate when the share value, and therefore the upfront tax, is minimal.