Pay tax on stock before it vests? When the 83(b) election makes sense

You join an early company and get restricted stock that vests over four years. The default tax treatment is simple and, for a fast-growing company, expensive: you owe ordinary income tax on the shares as they vest, on whatever they're worth that year. If the company takes off, you could owe a large bill on stock you can't sell yet.

There's a 30-day window to change that. An IRC §83(b) election lets you choose to be taxed now, at grant, on what the stock is worth today, instead of later at vesting on what it grows into. For a founder whose stock is worth almost nothing at grant, that can mean paying tax on near-zero today and turning all the future growth into long-term capital gain. The catch is the deadline. You have to file no later than 30 days after the stock is transferred, and missing it locks in the default.

What the 83(b) election changes

Without an 83(b), each vesting tranche is ordinary income at its value when it vests, and your holding period for capital-gains rates starts when the stock becomes substantially vested.

With an 83(b), you pay ordinary income tax now on the spread between what you paid and the value at transfer (often tiny for early stock), and the clock for long-term capital gains starts just after the transfer. Appreciation after that is capital gain, not compensation income.

The bet is appreciation. If the stock climbs, you've converted a big future ordinary-income bill into a small bill now plus capital-gains treatment on the growth. If it doesn't climb, or you leave before vesting, you've prepaid tax on value you never kept, and you don't get that prepaid tax back.

The "break-even appreciation rate" is just the point where the future capital-gains savings outweigh the tax you prepay. When the grant value is near zero, that bar is low, which is why early founders and first employees almost always file. The higher the value at grant, the more appreciation you need to justify it.

Where it goes wrong

• Trying to file an 83(b) on RSUs. Restricted stock and restricted stock units (RSUs) sound alike but are not the same thing. Restricted stock is shares you actually own now, subject to vesting. An RSU is only a promise to deliver shares later, so you own nothing today. The tax law is explicit that §83, including the 83(b) election, does not apply to RSUs, so there is no valid election to file on one. The election is for property actually transferred to you subject to vesting, like restricted stock or shares from an early-exercised option, not a plain option grant or an RSU.
• Missing the 30 days. It runs from the transfer date and it's strict. Late is the same as never.
• Filing when the stock is already valuable. If the grant-date value is high, the tax you prepay is real money on stock you might forfeit. The election is a bet, and the odds get worse as the upfront value rises.
• Forgetting the ISO twist. For shares from an early-exercised ISO, an 83(b) has zero regular-tax impact, but an 83(b) election for AMT purposes can pull the AMT adjustment into the year of exercise. Different reason, same form.

What to check before you file

• Is this transferred property, restricted stock or shares from an early-exercised option, or an RSU with no shares delivered yet? Only transferred property is eligible.
• What's the spread today, value minus what you paid? That's the tax you'd prepay.
• How likely are you to stay through vesting, and how much upside do you really expect?
• When exactly was the transfer? Count 30 days from that date, and don't cut it close.

If you've got a grant in front of you and a clock running, the Gnomon Diagnostic models the 83(b) decision against your real numbers, the prepaid tax, the break-even, the forfeiture risk, before the window closes. Start yours at start.gnomonplan.com.

This is general tax information, not advice for your specific situation. Talk with us or your tax professional before acting on it.