An engineer at a new firm gets 200,000 restricted shares on day one. They’re worth almost nothing now, but in four years they could be worth millions. One page filed in her first month decides whether the IRS taxes the pennies or the millions.

That page is the 83(b) election, named for Section 83(b) of the Internal Revenue Code. File within 30 days of gets the stock and you pay tax on its current value. Miss that window and each lot of shares is taxed as ordinary income on the day it vests, at whatever it’s worth then. The IRS grants no extensions.

Section 83 came with the Tax Reform Act of 1969. Its default rule: stock you gets for work, which you’d lose if you left before vesting, isn’t taxed until it vests. For a startup employee this is often a trap, because vesting is exactly when the shares have mature.

Subsection (b) moves the tax to the grant date instead. You pay tax on the stock’s fair market value at grant, minus anything you paid for it. Growth after that counts as capital gain, and your one-year clock for long-term treatment starts on day one.

She gets 200,000 shares worth $0.01 each and pays nothing for them. They vest in four equal annual chunks of 50,000 shares. Her marginal federal rate in the grant year is 24%.

With the election: She reports $2,000 of income now. Federal tax comes to about $480. Vesting later means no tax at all.

Without it: Each vest is taxed like wages.

That income rises into higher brackets. Assume a combined 32% and the federal bill comes to roughly $272,000.

She owes six figures on shares she can’t sell while the company is still private. Employers often withhold at the flat supplemental rate, which can fall short of her real bracket and leave her with a balance due at filing time.

Now say the company gets acquired. She sells all of her shares at $10 each, more than a year after the last vest.

• With the election: She has $1,998,000 of long-term gain. At the 20% top rate that’s about $399,600. Add the original tax and her total is about $400,080.
• Without it: Her cost basis is the $850,000 she was already taxed on. That leaves $1,150,000 of gain, or about $230,000 in tax. Including the earlier wage tax, her total is about $502,000.

The election saves roughly $101,920 in federal tax. That election could decrease the 3.8% net investment income tax exposure, which applies to gains under both choices. She also avoids owing tax during years she couldn’t sell. In high-tax states like California, state income tax widens the gap further.

The IRS requires the election be filed no later than 30 days after the date the property was transferred. Advisors put it bluntly: “No extensions, no relief, no exceptions.”

You can mail Form 15620 or a written statement to the IRS service center where you file your return. The IRS also now allows taxpayers to file the 83(b) election online. Keep proof of your filing date and give your employer a copy.

The election means paying tax upfront on the assumption that the stock will rise. Sometimes that assumption doesn’t pay off:

• Early exits: If you leave before vesting or the company folds, you lose the shares and can’t deduct the tax already paid.
• Expensive grants: When the stock is already worth a lot on grant day, the upfront bill gets big with no guarantee of growth.
• Wrong equity type: Restricted stock units don’t qualify. Stock options only qualify if your plan lets you exercise early into restricted shares.

The grant-day value, your odds of staying through vesting, and your state’s tax rate all go into this decision. A CPA can help run these numbers before day 30.

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