RSAs vs RSUs: the differences that actually matter

An RSA is real stock you own at grant; an RSU is a promise of stock later. That one distinction decides whether you can file an 83(b), when you owe tax, and whether you vote your shares from day one.

Restricted stock · Rules & mechanics

What is the real difference between an RSA and an RSU? One word does most of the work: ownership. A restricted stock award is real stock you own the day it is granted, just with strings. A restricted stock unit is a promise to give you stock later. That single distinction decides when you can vote, when you owe tax, and whether the 83(b) election is even on the table.

They sound like the same thing dressed up two ways. They are not, and confusing them can cost you the most valuable move in early equity.

RSA: real stock now

With a restricted stock award you receive actual shares at grant. They are yours, subject to vesting, and if you leave early the company can buy back or reclaim the unvested portion. Because you own stock now, you can usually vote and receive dividends right away, and you can file an 83(b) to be taxed on today’s tiny value and start the capital gains clock immediately.

This is why RSAs show up at the very beginning, when the stock is worth almost nothing. Handing someone real shares for a fraction of a cent is cheap and clean.

RSU: a promise of stock later

An RSU is a contractual promise. You own nothing until the units settle, usually at vesting. There is no 83(b) to file, because you cannot elect to be taxed now on stock you do not yet own. When the shares finally land, their full value is ordinary income that year.

Companies switch to RSUs once the stock is worth real money, because giving away valued shares outright would create an immediate tax bill for the recipient. The RSU pushes that bill to settlement.

Side by side

Real shares at grant. Often vote and collect dividends immediately. Can file an 83(b) within 30 days to lock in today’s value and convert future growth to capital gains. Common at the earliest stage, when the stock is near zero.

A promise of shares later. You own nothing until settlement. No 83(b) election exists. The value at settlement is ordinary income, taxed like salary the moment it lands. Common once the stock has real value.

The 83(b) is the whole point of the distinction

You can only elect to be taxed now on stock you actually own now. An RSA gives you that stock at grant, so the election is available and, on near-zero stock, powerful. An RSU gives you nothing yet, so there is nothing to elect on. If you remember one difference, remember this one.

How the tax splits

RSA, with 83(b)

Tiny ordinary income now on the grant value. All later growth is a capital gain at sale, taxed for 2026 at the long-term rate of 0%, 15%, or 20% depending on income 2026: married filing jointly, 0% up to $98,900, 15% up to $613,700, and 20% above; single, 0% up to $49,450, 15% up to $545,500, and 20% above. This is the founder’s home-field advantage.

RSA, without 83(b)

Each vesting slice is ordinary income at that year’s value, at a rate that for 2026 tops out at 37% 2026, the same trap as missing the deadline.

RSU, always

No election. Full value is ordinary income at settlement. Anything the stock gains after that is a separate capital gain.

What that ordinary income actually costs you depends on your own 2026 marginal bracket, not just the top rate above.

What this means for you

Read your offer before you sign and find the exact words. “Restricted stock award” means real shares, a vesting clock, and an 83(b) decision due in 30 days. “Restricted stock unit” means a promise, no election, and tax at settlement. The two get used loosely in conversation, but the tax code treats them very differently, and the difference is biggest at the earliest stage. Know which one you hold, and when the stake could be large, get a fit check before any window closes.

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