RSA vs RSU: Key Differences Explained

Seen as RSU vs RSA, the main difference is ownership. An RSA gives you shares today. An RSU gives you a right to shares later. The table compares them on what each is, who uses it, the legal and tax treatment, risk, when you can sell and a typical case.

Restricted Stock Award

With an RSA, the company issues shares in your name on day one. Sometimes you pay a small price, and sometimes nothing. The shares carry a substantial risk of forfeiture: if you leave before they vest, the company takes them back or buys them back at what you paid. Each vesting date removes that risk for part of the shares.

Founders often hold shares this way, a setup called reverse vesting. Employees can reach the same position by exercising options before they vest, which the early exercise guide covers.

Restricted Stock Units

With RSUs, nothing is issued at grant. The IRS treats each unit as an unfunded promise, usually worth one share. When a unit vests, the company delivers the share, or its cash value. At many private companies, units also wait for an IPO or a sale. The RSU guide covers that double condition.

IRS Publication 5992 puts it simply: an RSU settled in stock is like an RSA, except that the shares are not transferred until the unit vests.

Both awards are taxed as pay, but on different dates. Under Section 83, RSA shares are taxed when they vest. The income is their value that day, minus anything you paid. Until then, IRS Publication 525 says dividends on the shares count as wages.

An 83(b) election moves that date to the day you receive the shares. You report their value then, minus what you paid. If you paid full value, you report nothing, and the election still counts. Your holding period starts that day too, so later growth is a capital gain.

The election goes to the IRS within 30 days, with a copy to your employer. It cannot be undone without IRS consent. If you then leave and lose the shares, you get no deduction for the tax paid. Your loss is limited to what you paid for the shares, under the regulations.

RSUs have no such choice. Their value at delivery is wages, and your employer withholds federal income tax at 22%, or 37% above $1 million in a year. The RSU taxes guide covers Social Security, Medicare and selling.

The Same 40,000 Shares, Taxed Three Ways

An early employee receives 40,000 shares or units worth $0.10 each and pays nothing. A quarter vests each year, at share values of $1, $2, $3 and $4. Years later, she sells all 40,000 shares at $5.

With the election, $4,000 is taxed as pay and $196,000 as a capital gain. Without it, half the value is pay. RSUs land in the same place as an RSA with no election. If she had left after one year, the election would have cost her the tax on $4,000, with no refund.

Restricted Stock Award

For

You own shares from day one. An 83(b) election can turn most of the growth into capital gain and start the holding period early.

Against

The election costs tax upfront, with no refund if you leave. Without it, each vesting date is taxed and nothing may be withheld in cash.

Verdict: an RSA suits a founder or early hire while the shares are cheap. Then the tax at grant is small and the election costs little. As the share value rises, the upfront tax grows, and the award becomes harder to accept.

Restricted Stock Units

For

No tax until shares arrive. No upfront cost. Tax is withheld at delivery.

Against

All of the value at delivery is taxed as pay. No shareholder rights before delivery. No way to start the holding period early.

Verdict: RSUs suit a company whose shares are already valuable. Nobody has to pay tax on shares that might be lost. The cost is that every dollar of value at delivery is taxed at your full rate.

For an employee, neither is better in general. The answer turns on the share value at grant and on how sure you are to stay. When shares are cheap and you expect to stay, an RSA with an election usually leaves more of the gain taxed at capital gains rates. When shares are already valuable, RSUs spare you tax on shares you might lose.

For an outside investor, the choice shows up as dilution. Both awards add shares to the count once they vest or are delivered. RSA shares are already counted as issued, while RSUs sit in the pool of shares reserved for employees. Read the fully diluted count on the cap table to see both.

If you receive an RSA, the 30-day clock starts on the day the shares are transferred. Decide on the election before then, with an adviser. An election can also start the clock for the federal tax break on startup shares, which 83(b) election vs QSBS explains. For the tax interplay with options, see 83(b) election vs AMT.

If you hold RSUs, track the delivery dates, and plan for tax beyond the 22% withheld. What you keep when you leave is covered in vested vs unvested. For units that also depend on company goals, see PSU vs RSU.

Common Mistakes

• Missing the 30-day deadlineThe IRS grants no extension. After day 30, each vesting date is taxed.
• Trying to file an 83(b) on RSUsRSUs are not property under Section 83, so an election on them has no effect.
• Forgetting the copy to your employerThe regulations require one. Keep proof of the filing date.
• Ignoring dividends on unvested sharesWithout an election, they are wages and belong on your W-2.

Restricted stock award (RSA)

Actual shares issued now that the company can take back or buy back until they vest.

Restricted stock unit (RSU)

A promise to deliver a share, or its cash value, once the unit vests. Taxed as wages on delivery.

Substantial risk of forfeiture

A condition, such as staying employed, that must be met before you fully own the shares.

Vests

Meets its conditions. Vested shares or units are yours to keep.

83(b) election

A filing within 30 days that taxes restricted shares at their value when received. It cannot be undone without IRS consent.

Holding period

How long you have owned shares for tax. More than one year makes a gain long term.

Supplemental wages

Pay outside regular salary, such as bonuses and stock awards. Federal income tax is withheld on it at a flat 22%.

Every rule and figure was checked against the US Code, federal regulations and the IRS on November 6, 2026. They are US federal rules for tax year 2026. The worked example is illustrative arithmetic. Award terms vary within these rules. State tax is not covered.