83(b) Election Deadline and Filing Process

An 83(b) election changes when restricted equity is taxed, but its value depends on timely filing. For founders, missing the 30-calendar-day deadline can turn early equity appreciation into hundreds of thousands of dollars of ordinary income. Founders need to pin down the transfer date, file the right election, and keep proof that it was filed and the required copies were delivered.

What an 83(b) election actually does to your tax bill

IRC §83(a) makes each vesting date a separate taxable event for restricted shares. The founder includes the fair market value of the shares vesting on that date, minus the amount paid for those shares, in ordinary income. As the company grows, that taxable spread can grow with it. The tax therefore reflects the value when the restrictions lapse.

IRC §83(b)(1) lets the founder move that income recognition to the transfer date for the entire grant. The taxable amount becomes the fair market value at transfer minus the purchase price, which is often zero for shares purchased at fair market value at incorporation. Any later rise in value is then taxed as capital gain. The holding period for long-term capital gain treatment also begins at transfer.

Which equity grants are eligible and which are not

The election applies to transferred property subject to a substantial risk of forfeiture. Restricted stock awards are the core founder case because actual shares are transferred subject to vesting. Early exercise of unvested NSOs or ISOs also produces restricted property on which an election can be made. For ISOs, however, the election applies only for Alternative Minimum Tax purposes. A near-zero spread at early exercise fixes the AMT adjustment at a small amount. Profits interests in an LLC can also be eligible.

By contrast, an RSU is an unfunded, unsecured promise to deliver shares later. Treasury Regulation §1.83-3(e) excludes that promise from the definition of property, leaving nothing on which to elect. Fully vested shares have no substantial risk of forfeiture and therefore nothing to accelerate. An unexercised option likewise does not create the restricted property needed for this election.

Why the 30-day deadline is permanent and non-negotiable

The Tax Court has rejected late-filing arguments based on illness, attorney errors, and certified-mail problems. Those decisions make reliance on an explanation after the deadline a poor substitute for timely filing. IRC §83(b)(2) requires the election “not later than 30 days after the date of such transfer,” and the regulations repeat that requirement. There is no standard appeal process that gives a founder a fresh election window after an ordinary filing failure.

The timely-mailing rule under IRC §7502 counts the qualifying postmark date as the filing date when the filer has the right proof of mailing. It does not grant extra time to prepare the election. Narrow timing rules involving weekends, holidays, and disaster postponements are distinct from a general extension. The election is also difficult to undo once made. IRS consent to revocation is limited to a mistake of fact raised promptly after discovery, and Treasury Regulation §1.83-2(f) excludes a decline in company value from that category.

When the 30-day clock actually starts

Treasury Regulation §1.83-3(a) starts the clock when the recipient acquires beneficial ownership of the property. That determination depends on all the facts and circumstances. The board approval date, agreement signature date, and cap-table entry date do not independently settle the question. Shares may be transferred pursuant to a stock purchase agreement, but the actual transfer must be established from the transaction.

For example, if beneficial ownership passed when an issuance was approved and the founder signed paperwork two weeks later, much of the filing window would already be gone. A board resolution on its own, though, does not always mean that a transfer is complete. For early-exercised options, the exercise date starts the clock. Resolve uncertainty promptly with company counsel and confirm the transfer date in writing with stock administration. Then count 30 calendar days from that date.

What Form 15620 requires and how to complete it correctly

The IRS released Form 15620 in November 2024, and the revision specified here is April 2025. The form is the best choice in most cases, though a written statement that meets Treasury Regulation §1.83-2(e) is still valid. It requires the taxpayer’s name, address, and taxpayer identification number, together with a description of the property. It also requires the transfer date, taxable year, restrictions, fair market value at transfer, amount paid, and a statement that required copies were furnished.

The value must disregard restrictions other than those that will never lapse. Coordinate it with the company’s most recent 409A valuation because an unsupported figure creates audit and later due-diligence risk. Box 6 has separate spaces for the per-share fair market value, the number of shares, and their total value, while Box 7 does the same for the purchase price. Box 8 takes the total fair market value minus the total purchase price. Box 9, covering the service recipient’s details, is optional, but copy delivery is not. The form has one taxpayer signature line, so joint ownership, community property, or a different transferee requires attention with counsel before filing.

Filing online through the IRS portal

The IRS identifies electronic filing as its preferred method. Start by creating an IRS Online Account and finishing ID.me identity verification before day 25, so account access is in place before the final evening. Founders without US identity documents may have trouble getting through verification and should plan to file by mail or ask counsel for help early. The taxpayer must personally log in and submit through the personal account.

Before opening Form 15620 on the IRS website, gather the taxpayer details, property description and quantity, transfer date, taxable year, restrictions, value, and price paid. Complete the fields and review each share count and dollar amount, keeping the actual transfer date distinct from the date paperwork arrived. Submit electronically and save both the immediate receipt confirmation and the completed form. The online form requires confirmation that an election has not already been mailed for the same equity. Choose one way to file, then deliver the required copies.

Filing by mail when the portal is not an option

Complete and sign Form 15620 or a compliant written election, and print a copy for permanent records. Determine the correct IRS Service Center address through the current Form 1040 “Where to File” table for the taxpayer’s state of residence. The company’s address does not determine the destination, and a prior year’s address should not be reused without confirmation. Consider a cover letter if the taxpayer identification number is pending or the facts are non-standard.

Send the signed original by USPS Certified Mail from a retail counter several days before the deadline. Keep the dated receipt with the signed election and a record of the destination address. A Return Receipt gives more proof of delivery, while an envelope dropped into a collection box may not get a postmark that same day. Private delivery services can qualify under IRC §7502, but the service used must be one of the designated services. Before using one, confirm both its designation and the correct IRS street address rather than a P.O. box.

Delivering and storing copies after filing

Treasury Regulation §1.83-2(d) requires a copy for the person for whom the services are performed, typically the company, and for a different transferee where applicable. The company needs the election to report compensatory income correctly on Form W-2 or Form 1099 and to track basis. Missing copy delivery can create reconciliation problems during later funding rounds. By contrast, attaching the election to the taxpayer’s income tax return is no longer required for property transferred on or after January 1, 2016.

Keep the election that was signed or submitted, the portal confirmation or Certified Mail receipt and tracking PDF, and the documents that show the transfer date. Keep written support for fair market value and the purchase price in the same permanent record. Keep proof with a timestamp that shows the copies were delivered, such as an email, portal screenshot, or separate certified-mail receipt. Cerebras Systems’ 2025 Form DRS filed with the SEC had a Section 83(b) election form as Exhibit 1 to its early exercise notice agreement. That placement treats the election as part of the grant documentation.

How a missed or late election compounds at each funding round

A missed election does not necessarily produce an immediate tax bill when the filing window closes. Instead, at each future vesting date, the shares’ fair market value at that time, less the amount paid, can be taxed as ordinary income. A funding round is not itself the vesting event, but rising company value can increase the taxable spread at subsequent vesting dates.

On a standard four-year vesting schedule, that exposure can recur across the grant while the stock remains unavailable to sell to pay the tax. The holding-period consequences also remain tied to the separate vesting dates. Some founders attempt to cancel and reissue stock to restart the election window, but the IRS has addressed that approach unfavorably. It does not cure the missed election for the original grant.

How the QSBS holding-period clock interacts with the election

An earlier start to the holding period also helps with the qualified small business stock exclusion under Section 1202. For the five-year QSBS holding requirement described here, the critical distinction is whether time runs from transfer or separately from each vesting date. Without an 83(b) election, each tranche begins its holding period only when it vests. On a standard four-year vesting schedule, the last tranche’s five-year clock can start up to four years after the grant date.

With an election, the holding period begins at transfer across the entire grant. The election prevents vesting from deferring this holding-period start.

The genuine downside of filing that founders should weigh

The election means recognizing income sooner, before anyone knows what the company will be worth in the future. If the taxable spread at transfer is meaningful and the company later declines in value, the founder has chosen an upfront tax event that hindsight may make unattractive. A decline in value is not a mistake of fact that permits revocation. The decision therefore depends on the present spread as well as the expected growth.

The case is strongest when shares are purchased at or near fair market value, substantial growth is expected before vesting, and the founder reasonably expects to remain through the vesting schedule. For early-exercise ISOs, a spread that is near-zero also leaves near-zero AMT exposure when the election is made. For these reasons, filing at incorporation is a strong choice for most founders. Once that decision is made, execution and documentation become the immediate priorities.

A filing checklist to execute before day 30

Confirm the actual transfer date in writing with stock administration and resolve ambiguity with counsel. Count 30 calendar days forward, record the deadline, and set a reminder several days earlier as the mail-by target. Obtain written fair market value support coordinated with the most recent 409A valuation. If filing electronically, complete IRS Online Account setup and ID.me verification before day 25.

Complete Form 15620 using the April 2025 revision, or prepare a compliant written statement. Review the share counts, per-share amounts, and Box 8 total, then file through one route only. Save the portal confirmation or Certified Mail receipt and tracking PDF immediately. Deliver required copies and preserve timestamped proof, then store the election, submission evidence, transfer documents, and valuation support permanently. Treat every new restricted-stock grant or early exercise of unvested options as a separate election with its own 30-day window.