Section 83(b) Election Rules, Deadlines, and Filing

Under United States tax law, an election under Section 83(b) allows a startup founder or early employee who receives restricted stock subject to vesting to accelerate the tax assessment on that equity to the transfer date. According to IRS Form 15620, a taxpayer making this choice includes in gross income the excess of the fair market value of the property at transfer over the purchase price, rather than paying ordinary income tax on the value of the shares as they incrementally vest over subsequent years.

Making this election is a critical strategic move for early equity holders when the fair market value of company common stock is nominal. However, the procedural requirements are strict. Filing requires submitting physical paperwork to the Internal Revenue Service within an inflexible deadline, sending a copy to the issuing company, and archiving proof of mailing for future corporate due diligence.

The Rigid 30-Day Statutory Deadline

The statutory timeline governing an 83(b) filing is absolute. According to IRS Form 15620, the election must be filed no later than 30 days after the date the property was transferred.

Missing this window by even one calendar day invalidates the election. If the election is not timely filed, equity holders are taxed under standard Section 83 rules, which treat the spread between the fair market value and the purchase price as ordinary compensation income on each vesting date. If the company valuation grows significantly between the transfer date and future vesting dates, the resulting tax liability can create a severe cash burden on illiquid shares.

The calculation of this period depends on several concrete rules:

• Trigger date: The statutory period begins on the exact date of equity transfer (typically the grant date or stock purchase agreement execution date), not when share certificates are issued or when vesting schedules commence.
• Weekend and holiday relief: Instructions on IRS Form 15620 specify that if the 30th day falls on a Saturday, Sunday, or legal holiday, the election is considered timely filed if it is postmarked by the next succeeding business day.
• Proof of mailing: Because the IRS measures timely filing by the postmark date, founders should send the election package using certified mail with return receipt requested, keeping physical and digital records of the stamped postal receipt.

Required Information on Form 15620

Historically, taxpayers drafted individualized written statements to make the election. As documented in IRS Publication 525, individuals may still make this choice by filing either a written statement or the dedicated Form 15620 with the Internal Revenue Service Center where they file their federal tax return.

According to IRS Form 15620, the submitted filing must contain specific disclosures:

1. Taxpayer identification: The name, address, and taxpayer identification number (such as a Social Security number) of the person who performed the services.
2. Property description: A clear description of the property transferred (for example, a specified number of shares of common stock in the corporation).
3. Key operational dates: The date on which the property was transferred and the taxable year for which the election is being made.
4. Restriction terms: The nature of the restrictions to which the property is subject, such as a company repurchase option lapsing according to a standard vesting schedule.
5. Valuation figures: The fair market value of the property at the time of transfer, which instructions on IRS Form 15620 note must be determined without regard to any lapse restriction under Treasury regulations.
6. Financial calculation: The amount paid for the property and the resulting amount to include in gross income (calculated as the fair market value minus the amount paid).

If the founder paid full fair market value for the shares at inception, the excess included in gross income is zero, but the form must still be filed to establish that tax baseline.

Filing Mechanics: Submitting the Paperwork

Executing the filing involves more than mailing a single form to a federal processing center. A complete execution workflow requires careful coordination between the individual and the issuing company.

Mailing to the Correct Service Center

Instructions on IRS Form 15620 state that the completed and signed form must be submitted via mail to the IRS office with which the person who performs the services files their personal federal income tax return. The form is sent to the individual's regional processing center based on state of residence, not the company's state of incorporation.

Serving a Copy to the Company

In addition to federal filing, IRS Form 15620 requires the service provider to submit a copy of the completed and signed form to the person or entity for whom the services are performed. For startup employees and founders, this means delivering a copy to the corporate secretary, human resources department, or legal team.

Irrevocability and the Risk of Forfeiture

Filing an 83(b) election carries tangible financial tradeoffs that founders must evaluate before signing.

First, the decision is essentially permanent. As stated in IRS Publication 525, an 83(b) election cannot be revoked without IRS consent, and such consent is granted only if the taxpayer was under an explicit mistake of fact regarding the underlying transaction. A change in the company's valuation, business trajectory, or employment status does not qualify as grounds for revocation.

Second, the tax paid upon filing cannot be recouped if the shares are subsequently forfeited. According to IRS Publication 525, if property is forfeited after including its value in income, the allowable tax loss is strictly limited to the amount paid for the property minus any amount realized on the forfeiture. The taxpayer receives no tax deduction or refund for the compensation income recognized and taxed at the time of the election.

For founders purchasing shares at par value, the out-of-pocket tax risk at grant is often negligible. However, for later hires buying restricted stock at higher valuations, prepaying income tax on shares that could be forfeited if they leave early represents real financial exposure.

Excluded Instruments: Stock Options and Section 83(i)

The 83(b) election applies only to transfers of property, such as restricted stock. It is not an all-purpose instrument for equity compensation.

According to guidance in IRS Publication 525, a taxpayer cannot make an 83(b) election for a statutory or nonstatutory stock option. Option grants represent a contractual right to purchase shares in the future rather than a completed property transfer, meaning Section 83(b) does not apply at grant.

Furthermore, IRS Publication 525 clarifies that taxpayers cannot use Form 15620 to make an election under Section 83(i), which provides a separate, distinct deferral mechanism for qualified equity grants in private corporations.

Corporate Governance and Diligence Records

Filing the election correctly is only half the battle; maintaining immutable proof of the filing protects both the founder and the company during future corporate milestones.

Legal guidance from Cooley GO emphasizes that maintaining up-to-date, clear, concise records of all board and stockholder actions makes institutional financing and corporate diligence less painful. When a company raises venture capital or undergoes an acquisition, incoming investors examine corporate records and employee equity files.

Missing 83(b) elections can create unexpected tax withholding liabilities for the corporate entity if the IRS later challenges whether vesting shares triggered employment taxes. Educational resources from Cooley GO describe a data room as a secure space for sharing contracts and corporate documents with potential investors or acquirers. Corporate repositories should house:

• The fully signed stock purchase or restricted stock agreement.
• The formal board consent authorizing the equity issuance.
• A complete copy of the signed Form 15620 or written statement.
• Certified mail receipts and postal tracking confirmations proving timely dispatch within the statutory window.

Founders building out early-stage corporate infrastructure can review practical organizational frameworks in the Knowledge guides for founders to ensure corporate records remain compliant from day one. Structuring clean financial models and capitalization forecasts with Ember gives management visibility over equity distribution, helping teams navigate founder tax obligations, hiring rounds, and institutional diligence with clarity.