The 83(b) Election: The 30-Day Deadline That Can Save You Thousands

There's a tax election almost nobody teaches in school, buried in the tax code, with a 30-day window that cannot be extended under any circumstances.

If you work at a startup and receive restricted stock — or exercise early-stage stock options — missing this deadline can cost you a significant amount of money. In some cases, a lot more than that.

It's called the 83(b) election, and here's what you need to know.

What is an 83(b) election?

Under Section 83 of the tax code, when you receive property (including company stock) in exchange for services, you owe ordinary income tax on the value of that property — but only when it "vests," not when you receive it.

The logic: unvested stock can be forfeited. You haven't truly "received" it yet. So the IRS waits until the forfeiture risk disappears before taxing you.

The 83(b) election is an opt-out. It says: "Tax me now, at today's value, not later when it vests."

Why would you ever want to pay tax sooner? Because if the company grows, today's value is much lower than the future value. Electing to pay tax now — on a small number — means your future appreciation is taxed at capital gains rates instead of ordinary income tax rates.

The 30-day window

You have exactly 30 days from the date you receive the restricted stock (or exercise early) to file an 83(b) election with the IRS.

• 30 days. Not business days. Calendar days.
• No extensions. No exceptions. Not even if you didn't know.
• If you miss it, you cannot go back and elect.

This is one of those situations where ignorance genuinely costs money.

Where this applies: who should care

83(b) elections are most relevant for:

1. Founders receiving restricted stock that vests over time. Day one of the company, your stock may be worth fractions of a cent. By year four, it could be worth considerably more. Filing the 83(b) election at founding locks in that penny-per-share valuation.
2. Early employees who exercise stock options early (before they vest). This is called an early exercise, and it's only possible if your option agreement allows it. If you can exercise on day one at a $0.01 strike price, you can simultaneously file an 83(b) election.
3. Anyone receiving restricted stock (RSAs, not RSUs) that vests over time.

Who it does NOT apply to:

• RSU holders. RSUs (Restricted Stock Units) are treated differently under the tax code. 83(b) elections aren't available for RSUs.
• People who exercise fully vested options. If your options are already vested, there's nothing to elect — there's no vesting risk, so the election doesn't change anything.

The math: why it matters

Concrete example:

You join a startup at founding. You receive 1,000,000 shares of restricted stock with a 4-year vest. Current fair market value: $0.01/share.

Without an 83(b) election:

• At year 1 (25% vested): FMV is now $0.50/share. You owe ordinary income tax on 250,000 × $0.50 = $125,000 of income.
• At year 2: FMV is $1.00/share. Tax on another 250,000 × $1.00 = $250,000 of income.
• And so on, every year, as the company grows.

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

• Day 1: You owe ordinary income tax on 1,000,000 × $0.01 = $10,000 of income.
• Your clock starts for long-term capital gains.
• All future appreciation from $0.01 to exit price is taxed as capital gains, not ordinary income.

At a $5/share exit, the difference between these two paths is potentially hundreds of thousands of dollars in tax.

The risk: what you're betting on

The 83(b) election is a bet that the company will be worth more when you sell than it is today.

If you file the election and the company fails — or you leave before vesting — you've paid tax on value you never realized. You don't get that tax back (there are some mechanisms to deduct losses, but they're limited and complicated).

For founders who receive stock at essentially zero value, this is usually a no-brainer: the tax today is minimal, the upside is real.

For early employees exercising options at low strike prices, the calculus is similar but slightly more nuanced — you're paying cash (the exercise price) and possibly a small tax bill in exchange for the capital gains clock starting.

For later-stage employees exercising at a higher strike price against a higher FMV, the numbers get bigger and the risk goes up. Consult a tax advisor before filing.

How to file an 83(b) election

The IRS doesn't have an official form for this. You write a letter. The requirements are:

1. "Section 83(b) Election" as the header
2. Your name, address, and Social Security number
3. Description of the property (e.g., shares of XYZ Corp restricted stock)
4. Date of transfer and the taxable year you're electing into
5. Nature of the restrictions (i.e., vesting schedule)
6. FMV of the property at transfer (with no restrictions taken into account)
7. Amount paid for the property (usually the exercise price)
8. Statement that you've provided copies to the company and relevant parties

Filing mechanics:

• Send via certified mail (return receipt requested) to the IRS Service Center where you file your federal taxes
• Send a copy to your employer/the company
• Keep a copy for yourself — forever
• Attach a copy to your federal tax return for the year of election

Many startup lawyers provide 83(b) election templates. Companies like Carta have tools that help founders file these correctly. If you're in any doubt, use a template from a reliable source or have an attorney review it.

Do not assume your company, broker, or administrator will file this for you. They won't. This is your responsibility.

Common mistakes

Waiting too long. The clock starts on the date of transfer, not the date you received paperwork, not the date your lawyer called, not the date you fully understood what you received. 30 days. Set a calendar reminder immediately.

Confusing RSUs and RSAs. RSUs (Restricted Stock Units) are a promise to deliver stock in the future. You don't receive shares now — you receive shares when they vest. There's nothing to make an 83(b) election on with RSUs. If you have RSUs (common at later-stage companies and public companies), this entire post is largely irrelevant to you.

Not keeping records. If you're ever audited, you need to prove you filed. The certified mail receipt is your evidence. Keep it.

Thinking early exercise is always better. Early exercise + 83(b) election is powerful at very low valuations. At Series B+ companies where you're paying significant cash to exercise, run the numbers first.

Should you do it?

The 83(b) election is almost always worth filing if:

• You're a founder receiving stock at nominal value
• You're an early employee who can exercise at a low strike price with a significant upside scenario

It's less obviously correct when:

• The exercise price is high relative to current FMV (less spread to protect)
• You're less confident in the company's trajectory
• The cash required to exercise is meaningful to you

When in doubt: talk to a CPA or startup attorney. The 30-day window doesn't wait, but filing incorrectly is worse than not filing at all.

The bottom line

The 83(b) election is one of the highest-leverage tax decisions early startup employees and founders can make. The window is short, the process is manual, and almost nobody explains it clearly when you're onboarding.

Now you know.

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This post is for informational purposes only and does not constitute tax or legal advice. Consult a tax advisor or attorney for guidance specific to your situation.