If you are a startup founder who just received restricted stock in your company, the most time-sensitive legal decision you will make in the next thirty days is one that most people have never heard of. It is called an 83(b) election, it is filed with the IRS, and if you miss the deadline — which is thirty days from the date your stock is granted — the election is void. There are no extensions. There are no exceptions. There is no IRS form to request more time.

This post explains what the election is, why it matters for your personal tax bill, and exactly how to file it.

What Is an 83(b) Election?

Section 83 of the Internal Revenue Code governs what happens when someone receives property — including stock — in exchange for services. Under the default rule, you are taxed on the fair market value of the property at the time it vests, not at the time you receive it. For a startup founder on a four-year vesting schedule, that means you are taxed on each tranche of stock as it vests — potentially at a much higher value than when the shares were first granted.

An 83(b) election is a one-page filing that tells the IRS you want to be taxed on the full value of the restricted stock right now — at the time of the grant — rather than as the shares vest over time. You pay tax today on the current value. Future appreciation is treated as capital gain when you eventually sell the shares, not as ordinary income when shares vest.

Why It Matters: The Numbers

The impact of the 83(b) election becomes clear through a simple example. Suppose you are a co-founder who receives 1,000,000 shares of restricted stock at $0.001 per share — the standard par value for a newly formed Delaware C-corp — with a four-year vesting schedule (one-year cliff, then monthly vesting). Your total purchase price is $1,000.

Without an 83(b) election: At the end of year one, 250,000 shares vest. If the company has raised a Series A and the stock is now worth $2.00 per share, those vesting shares are worth $500,000. You owe ordinary income tax — potentially at federal rates above 37% — on $500,000 of income that year. You may not have $185,000 in cash to pay that bill. This continues every month as additional shares vest at whatever the current market value is.

With an 83(b) election: You filed the election the week you received the shares. The taxable event happened at grant. At $0.001 per share, 1,000,000 shares were worth $1,000 total. You paid tax on $1,000 — effectively nothing. All future appreciation from $0.001 to whatever the shares are worth when you eventually sell is capital gain, taxed at preferential long-term capital gains rates once you have held the shares for more than one year from the grant date.

The difference between these two scenarios can easily be hundreds of thousands of dollars in taxes — sometimes more.

What Qualifies: Restricted Stock, Not Options

The 83(b) election applies to unvested restricted stock — shares you purchase outright but that are subject to a vesting schedule and the company's right to repurchase them if you leave. It does not apply to stock options in the ordinary sense. Options have their own set of tax rules (ISOs and NSOs are governed differently), and an 83(b) election is generally not available for an unexercised option because you have not yet received property.

There is one important nuance: if your company allows early exercise of options — meaning you can exercise the option before it vests — then you can file an 83(b) election on the unvested shares you receive upon early exercise. In that case, the analysis above applies equally. The election must still be filed within 30 days of the early exercise date.

Do not confuse the 83(b) election with the 83(i) election, which is a separate provision that allows certain private company employees to defer taxes on stock option exercises. The 83(i) election has its own rules and limitations and is a different planning tool entirely.

The 30-Day Deadline Is Absolute

The IRS has confirmed in multiple rulings that the 30-day deadline for filing an 83(b) election is an absolute requirement. It cannot be extended, waived, or cured after the fact. If you miss it — even by one day — the election is void and you are subject to the default rule: taxed as shares vest at their then-current fair market value.

The 30-day period begins on the date of the grant, not the date you receive the stock certificate, not the date you countersign the restricted stock agreement, and not the date your attorney sends you the documents. If your grant date is July 16, you must file by August 15.

How to File

Filing the election involves four steps:

  • Prepare the election letter. The IRS provides a sample form, but any letter that includes the required information is acceptable: your name, address, and taxpayer identification number; a description of the property (shares, class, company); the date of transfer and the tax year; the nature of the restriction (vesting schedule); the fair market value at the time of transfer; the amount paid for the property; and a declaration that you are making an election under Section 83(b).
  • Sign two copies. You need one copy for the IRS and one for your own records. Prepare a third copy for the company as well.
  • Mail the original to the IRS. Send it to the IRS service center for your region — the same address where you file your individual income tax return. Send it via certified mail with a return receipt so you have proof of the mailing date. The IRS does not send a formal acknowledgment; the proof of mailing is your evidence that you filed on time.
  • Attach a copy to your tax return. Include a copy of the election with your federal income tax return for the year of the grant and report the income (if any) from the grant on your return.

The Risk Calculus

The one genuine downside of the 83(b) election is that you pay tax today on stock that might never be worth anything. If the company fails after you file the election, you have already recognized income and paid tax on the stock's value at grant — and you cannot get that tax back. You may be able to take a capital loss on the worthless shares, but that loss has its own limitations.

For most founders at the early stage, this risk is small in absolute terms. If you are receiving founder shares at $0.001 per share, the tax on the grant-date value is likely minimal — often less than a few hundred dollars. The potential upside — avoiding ordinary income tax on millions of dollars of appreciation — vastly outweighs the downside risk of paying a small tax now on shares that turn out to be worthless.

The Delaware Timing Consideration

One practical point: the 30-day clock starts running from the date of your stock grant, which is typically the date of your Restricted Stock Purchase Agreement. You want to make sure you incorporate your Delaware C-corp, authorize the shares, enter into the restricted stock agreement, and file the 83(b) election in the right order — and all in a compressed timeframe. Working with a startup attorney to get the incorporation documents and restricted stock agreement in order before shares are issued keeps everything clean.

The Bottom Line

The 83(b) election is one of the highest-leverage legal actions a founder can take. It takes about 30 minutes to file and can save six or seven figures in taxes over the life of your company. The only prerequisite is timing: you must file within 30 days of the grant date.

Make this a priority the week you receive your restricted stock agreement — not next week, not when you have time, not after the next board meeting. The deadline does not move.