83(b) Election: What It Is and Why It Matters

An 83(b) election is a written statement you file with the IRS that changes when you are taxed on restricted stock. Without it, you are taxed at ordinary income rates each time restricted shares vest — which can mean a large, recurring tax bill in cash for stock you cannot sell. With it, you choose to be taxed immediately, at the time of grant, when the value is typically near zero. All future appreciation then becomes capital gain rather than ordinary income. The election is named for the section of the Internal Revenue Code that governs it.

The mechanics are straightforward. The stakes are high. And the deadline — 30 calendar days from the grant date, with no exceptions and no extensions — makes it one of the most time-sensitive financial decisions a startup employee will ever face.

The Default Rule: Why Section 83 Matters

Section 83 of the Internal Revenue Code establishes the default tax treatment for property received in connection with services. When you receive shares that are subject to vesting — meaning the company can take them back if you leave before a certain date — those shares are considered "substantially nonvested." Under the default rule, you are not taxed when you receive the shares. You are taxed when each tranche vests, on the fair market value of the shares at that vesting date, as ordinary income.

For most employees at mature companies, this is fine: vesting creates a tax event, you receive the shares (or cash equivalent), and you can sell immediately to cover the taxes. At a private company with an illiquid stock that has grown significantly in value, this default creates a real problem: you owe ordinary income tax on shares that are worth something on paper but impossible to sell. The cash to pay the tax has to come from somewhere else.

Example of the default rule without an 83(b) election:

You receive 100,000 RSA shares at a seed-stage company when the 409A fair market value is $0.05 per share. Four years later, the company has grown and the 409A FMV is $4.00 per share. Under a 4-year monthly vesting schedule, you vest approximately 2,083 shares per month. Each month, you owe ordinary income tax on:

2,083 shares × $4.00 FMV = $8,333 of ordinary income

At a combined federal and California marginal rate of approximately 50%, that is $4,167 in cash taxes per month — on stock you cannot sell. Over the four-year vest, the total ordinary income is $400,000, generating approximately $200,000 in tax liability.

With an 83(b) election filed within 30 days of grant:

You elect to be taxed on the FMV at the grant date: 100,000 shares × $0.05 = $5,000 of ordinary income. At the same 50% combined rate, your total tax from the election is $2,500. All future appreciation is capital gain. If you hold the shares for more than one year after the grant date, any gain on sale is taxed at long-term capital gains rates.

The difference: $2,500 vs. $200,000. This is not unusual for employees who join at early stage and stay through significant company growth.

When the 83(b) Election Applies

The 83(b) election is relevant in two specific situations:

1. Restricted Stock Awards (RSAs). RSAs are grants of actual shares that vest over time. The company retains a repurchase right on unvested shares. Because you already own the shares (subject to repurchase), the 83(b) election lets you recognize all the income upfront at the current FMV. See What Is a Restricted Stock Award (RSA)? for how RSAs work.

2. Early Exercise of Stock Options. Some companies allow employees to exercise stock options before they vest — receiving unvested shares subject to the same repurchase conditions as an RSA. When you early-exercise, you now own restricted property, and the 83(b) election becomes available and critical. See Early Exercise of Stock Options for the full mechanics.

The 83(b) election does NOT apply to:

• Standard RSUs in private companies (double-trigger RSUs) — because RSUs are a promise to deliver shares in the future, not a current transfer of restricted property. The 83(b) is irrelevant until shares are actually delivered, and by that point the Section 83 analysis works differently.
• Vested shares — once shares are vested, there is no substantial risk of forfeiture, so Section 83 no longer applies.
• Options that you have not yet exercised — you do not yet own property, so there is nothing to elect on.

The 30-Day Deadline: Hard, Absolute, No Exceptions

The 30-day window for filing an 83(b) election is one of the few truly non-negotiable deadlines in the Internal Revenue Code. The IRS has consistently refused to grant relief for missed deadlines. Courts have rejected equitable exception arguments. Tax attorneys universally describe it as a cliff: file within 30 days, and you get the benefit; file on day 31, and you get nothing.

The 30 days starts on the date the property is transferred — the grant date for RSAs, or the exercise date for early-exercised options. Every calendar day counts, including weekends and holidays. If day 30 falls on a Saturday, Sunday, or legal holiday, the deadline extends to the next business day (per IRC §7503).

Do not wait. Most startup attorneys advise filing within the first week of receiving your grant. The closer you get to day 30, the higher the risk that a filing error, a postal delay, or a travel conflict causes you to miss the deadline permanently.

How to File: IRS Form 15620

As of April 2025, the IRS released Form 15620 — the official form for making a Section 83(b) election. Prior to this form, elections were made by submitting a written statement meeting the requirements of Treas. Reg. § 1.83-2. Both methods remain valid, but Form 15620 is the cleaner approach going forward.

Information you need to complete the form:

• Your name, address, and taxpayer identification number (SSN or ITIN)
• The date the property was transferred (your grant date or exercise date)
• Description of the property (e.g., "100,000 shares of common stock of [Company Name], Inc.")
• The taxable year in which the transfer occurred
• Description of the restrictions (vesting schedule and repurchase right)
• FMV per share at the time of transfer (from the company's current 409A valuation)
• The amount paid per share, if any (usually the nominal par value, e.g., $0.0001)
• The amount to include in gross income (FMV minus amount paid, times number of shares)

The filing process — two valid methods:

Option 1 — Online (preferred). The IRS now allows Form 15620 to be submitted electronically through the IRS mobile-friendly forms portal at IRS.gov, using an IRS Online Account authenticated via ID.me. Online submission provides immediate confirmation of receipt — eliminating the uncertainty of postal delivery. Once submitted, download the confirmation and a copy of the filed form to provide to your employer. File using one method only — do not also mail a copy, as duplicate submissions cause processing delays.

Option 2 — Mail. Print and complete Form 15620 (or a written statement meeting the requirements of Treas. Reg. § 1.83-2). Mail to the IRS Service Center where you file your annual tax return via USPS Certified Mail, Return Receipt Requested. Keep the Certified Mail receipt (PS Form 3800) and the green return receipt card as proof of timely filing. The election is considered filed on the postmark date — not the date the IRS receives it.

Regardless of method: provide a signed copy to your employer (required for W-2 reporting) and keep a copy plus all proof of filing for your own records permanently — the IRS can audit equity transactions years later.

The Tax Math: Three Scenarios

Scenario A — RSA at very early stage, 83(b) filed:

• 500,000 shares granted, 409A FMV = $0.0001/share
• Taxable income at election: $50
• Tax owed: ~$25 (at ~50% combined CA + federal rate)
• All future appreciation: capital gain

Scenario B — RSA at seed stage, 83(b) filed:

• 100,000 shares granted, 409A FMV = $1.00/share
• Taxable income at election: $100,000
• Tax owed: ~$50,000
• All future appreciation: capital gain
• The election is still often worthwhile if you have high conviction in the company, but it is a real cash cost that must be funded.

Scenario C — RSA at seed stage, no 83(b) election, company grows:

• 100,000 shares, $1.00 FMV at grant, $10.00 FMV at vest date (4 years later)
• Ordinary income recognized over 4 years: $1,000,000
• Tax owed: ~$500,000 — with no ability to sell shares to fund it
• This is the scenario the 83(b) election is designed to prevent.

Scenario B illustrates an important nuance: the 83(b) election is not free at later-stage grants where FMV is already meaningful. At $1.00 per share, a 100,000-share grant creates $100,000 of immediate ordinary income — that is a real cash cost. Evaluate the election against: (1) how much you believe the company will grow, (2) whether you can fund the tax bill, and (3) what happens if the company fails.

When the 83(b) Election Is a Bad Idea

The 83(b) election is not always the right choice. The main scenarios where it makes sense not to file:

The company's FMV is already high. If the 409A FMV is $5.00 per share and you are receiving 50,000 shares, the election creates $250,000 of immediate ordinary income. That is a large bet on company success. If you leave in year one or the company fails, you have paid $125,000+ in taxes on stock you no longer hold (or that is now worthless), with no refund.

You have low conviction. The 83(b) election is a bet that the company will grow and the shares will be worth more than they are today. If you are uncertain about the company's prospects, paying taxes now on potentially worthless shares is a poor tradeoff.

You plan to leave early. If your plans may change within the first year, the 83(b) election is risky. File it only if you have reasonable confidence you will remain through at least part of the vesting period.

The 83(b) and QSBS

The interaction between the 83(b) election and Qualified Small Business Stock (Section 1202) is one of the most valuable — and most overlooked — aspects of early-stage equity planning. The QSBS exclusion requires that you hold the stock for a minimum holding period, and the holding period begins when the stock is acquired. Filing an 83(b) election starts the QSBS clock on all shares simultaneously at the grant date — rather than separately for each vesting tranche.

Without the 83(b) election, if your RSA shares vest over four years, each tranche has a different acquisition date — the date each tranche vested. The QSBS clock starts separately for each tranche. With the 83(b) election, all shares have the same acquisition date (the grant date), and the clock starts running on all shares at once.

The QSBS exclusion rules differ depending on when your stock was issued:

• Stock issued on or before July 4, 2025: Requires a holding period of more than five years. The excluded gain is capped at $10 million (or 10x adjusted basis). No partial exclusion is available for shorter holding periods.
• Stock issued after July 4, 2025 (OBBBA rules): The One Big Beautiful Bill Act introduced a tiered holding period — 50% exclusion at 3 years, 75% at 4 years, 100% at 5 years. The per-issuer gain exclusion cap increased to $15 million (or 10x adjusted basis). The company gross assets threshold for QSBS eligibility also increased from $50 million to $75 million.

For early employees who receive RSAs when the company is genuinely early-stage and eventually see a successful exit, the combination of an 83(b) election and QSBS eligibility can eliminate federal capital gains tax entirely on qualifying gains. California does not conform to the QSBS exclusion — the gain is still fully taxable at the state level regardless of holding period. See Qualified Small Business Stock (QSBS) for the full eligibility requirements and California analysis.

California Note

California conforms to the federal treatment of the 83(b) election. Filing the election reduces future California ordinary income from vesting, just as it does at the federal level. If FMV is near zero at grant, the California taxable income from the election is also near zero.

However, California taxes all equity income — including long-term capital gains — at ordinary income rates up to 13.3%. The shift from ordinary income (at vesting) to capital gain (after holding) does not reduce California taxes in the same dramatic way it does at the federal level. The primary California benefit of the 83(b) election is preventing large ordinary income tax bills at vesting dates when shares cannot be sold.

This article is for educational purposes only and does not constitute tax, legal, or financial advice. The 83(b) election decision has permanent tax consequences and is time-sensitive. Always consult a qualified tax advisor before your grant date, not after.