Restricted stock units are taxed like wages at vesting, then taxed again only on the price change when you sell.
RSUs turn into real shares later, and taxes follow that timing. Most confusion comes from mixing up the two tax moments. Once you separate them, you can read your paystub, your W-2, and your 1099-B without guessing.
Below is the plain sequence: what’s taxed, when it’s taxed, and what numbers you should save each vest so you don’t overpay.
How RSUs Are Taxed At Vesting And Sale
RSUs usually create two layers of tax:
- Vesting: the fair market value of vested shares is treated like pay. It’s included in W-2 wages and can trigger payroll taxes.
- Sale: the stock’s move after vesting becomes a capital gain or capital loss when you sell.
Think of vesting as the moment you “receive” compensation. Think of selling as the moment you “close out” an investment.
What You Own Before Vesting
An RSU grant is a promise, not stock in your name. You generally can’t sell before vesting because you don’t own shares yet. That’s why most standard grants don’t create federal income tax on grant day. Vesting is the first time you actually receive shares (or cash equal to shares).
RSUs are also different from stock options. Options involve buying shares later. RSUs deliver shares without a purchase price, so the tax bill can arrive at vesting even if you don’t sell.
Vesting Day: Where Ordinary Income Shows Up
On vesting day, your company values the shares at the market price and treats that value as compensation. You’ll often see it on your pay statement as supplemental wages. At year end, it’s usually included in Box 1 of your W-2.
Your employer also withholds taxes at vesting. Many employers use the flat federal withholding method for supplemental wages described in Publication 15 guidance on supplemental wages. That withholding is a prepayment. Your final tax rate can be higher or lower based on your full-year income.
Why The Share Count Shrinks
Most plans cover withholding by selling shares right away (“sell to cover”) or holding back shares (“net settlement”). You may receive fewer shares than vested. You’re still taxed on the value of all shares that vested, not only the shares you kept.
The Number That Matters: Vesting Value Per Share
The vesting-day market price becomes your starting cost basis. It’s the anchor for capital gains math later. Keep the vest notice or release confirmation. It usually shows the vest date, the price used, and the share count.
If you want IRS language on what is taxable income, Publication 525 is a useful reference for how compensation is treated on a return.
Selling RSU Shares: Capital Gains And Holding Period
After vesting, the shares are just stock. When you sell, you compute gain or loss as sale proceeds minus your cost basis (the vesting value), minus any selling fees. The holding period usually begins the day after vesting.
The IRS overview of this concept is in Topic 409 on capital gains and losses. If you sell within one year of vesting, the result is commonly short-term. If you hold longer than one year, it’s commonly long-term.
Same-Day Sale
A same-day sale often shows little gain or loss because the sale price is close to the vesting price. You still report the sale. If your broker shows a $0 basis on the 1099-B, your return can show a fake gain unless you correct the basis.
Later Sale
If the stock rises after vesting, that rise is taxed as a capital gain when you sell. If the stock falls, you can have a capital loss. Loss limits can apply, with the remainder carried to later years.
Table: RSU Tax Events And The One Thing To Save
RSU taxes get simple when you treat them as a timeline. Save one clean number at each step.
| Event | What gets taxed | What to save |
|---|---|---|
| Grant | Usually nothing at grant | Grant date and vest schedule |
| Vesting | Ordinary income treated like wages | Vesting price and shares vested |
| Withholding | Tax prepayment via shares sold or withheld | Shares sold/withheld and tax amount remitted |
| Net shares delivered | No new tax by itself | Net shares received per lot |
| Sale | Capital gain or loss after vesting | Sale price, fees, and sale date |
| State move | State wage tax can depend on work location | Where you worked during the earning period |
| Job exit or layoff | Unvested units often forfeit | Final vest details and paystub lines |
| Transfer between brokers | No new tax by itself | Lot history and basis notes |
How RSUs Appear On Your Tax Forms
You’ll usually see RSUs in two places: wages on your W-2 and stock sales on your 1099-B.
W-2
The vesting value is typically included in Box 1 wages. Payroll taxes can also apply, so Boxes 3 and 5 may rise too. Many payroll portals list RSU income as a distinct line item during the year, which helps you match vesting totals to the W-2.
1099-B
When you sell shares, your broker reports proceeds on Form 1099-B. Basis reporting can be missing or off for RSUs. Your record of the vesting price is the fix. If the broker basis is wrong, you adjust it when you report the sale so you don’t pay tax twice.
Form 8949 And Schedule D
Most taxpayers report stock sales on Form 8949 and summarize on Schedule D. This is where RSU basis corrections happen. The goal is simple: wage tax on vesting value once, then capital gains tax only on the post-vesting move.
Why Withholding Often Misses Your True Tax Bill
It’s common to owe at filing time even after shares were withheld at vesting. A flat supplemental withholding rate may not match your marginal rate, and RSU income can push you into a higher bracket. State withholding can also lag behind state tax owed.
If you see a pattern, a simple fix is to increase withholding on regular pay using Form W-4, or make an estimated payment after large vesting months. This keeps you away from a surprise balance due.
State Tax And Multistate Work
States may tax RSU income as wages at vesting. If you worked in more than one state during the period that earned the RSUs, some states expect wage allocation across those states. Payroll teams try to handle it, yet moves and remote work can create mismatches.
Keep a basic log of where you worked tied to each vesting block. If a state questions your W-2 sourcing later, that log gives you a clean story.
Dividend equivalents and cash payments
Some RSU plans pay dividend equivalents while units are unvested. The plan might credit cash, credit extra units, or add a cash amount to payroll. The tax result depends on how it’s paid. Cash paid through payroll is commonly treated like wages. A dividend equivalent paid after vesting, inside a brokerage account, can be reported more like investment income. The plan statement usually labels it clearly.
If you see dividend equivalents on a paystub, file them with the vest records for that month. If you see them on a broker statement, keep the year-end statement with your 1099 forms. Mixing these streams is a common source of mismatched totals.
RSUs and estimated tax planning
RSUs can land in big chunks, so it helps to plan around dates rather than waiting for April. After a large vest, compare total withholding so far to your rough tax picture. If the gap looks large, you can add withholding on salary or make an estimated payment. This is often easier than selling extra shares later just to cover an unexpected bill.
Table: Paperwork Checklist For Clean Reporting
Clean records beat guesswork. For broader rules on investment reporting concepts like basis and sales of securities, Publication 550 lays out the framework used for gains and losses.
| Item | Where to find it | What it does for you |
|---|---|---|
| Vesting notice | Plan portal or broker release email | Locks in vest date, shares, and vesting price |
| Paystub showing RSU income | Payroll portal | Shows taxes withheld at vesting |
| W-2 | Employer | Shows total wages for the year |
| 1099-B | Broker | Shows sale proceeds and reported basis |
| Trade confirmation | Broker statement | Captures fees and exact sale price |
| Lot worksheet | Your notes | Keeps basis tied to each vest so gains aren’t overstated |
| Work-location log | Calendar or travel record | Helps if you need to allocate income across states |
Common Errors And How To Avoid Them
Using a $0 cost basis
This is the classic double-tax trap. If the basis is treated as $0, your return can show the full proceeds as capital gain even though vesting value was already taxed as wages. Your vesting notice is the remedy.
Forgetting that withholding is not final tax
Shares withheld at vesting feel like “tax paid,” and it is tax paid, just not always enough. Watch your year-to-date withholding against your income level, especially in heavy vesting quarters.
Keeping too much company stock by default
Taxes are only one part of the decision. If RSUs make your net worth depend on one employer, set a simple rule: what you sell at vesting, what you keep, and what price or date triggers another sale.
A Five-Minute Routine For Every Vest
- Save the vest notice and write down the vesting price per share.
- Save the paystub line that shows RSU income and withholding.
- Log net shares received, plus any shares sold or withheld.
- When you sell, attach the trade confirmation to that lot.
- When filing, compare your saved basis to the 1099-B basis and correct if needed.
Follow that routine and your RSUs turn into clean numbers: wages on the W-2, gains or losses on stock-sale forms, no duplicate tax.
References & Sources
- Internal Revenue Service (IRS).“Publication 15 (Circular E), Employer’s Tax Guide.”Describes federal withholding rules for supplemental wages, a common method used when RSUs vest.
- Internal Revenue Service (IRS).“Publication 525, Taxable and Nontaxable Income.”Explains how compensation is treated as taxable income, which is the basis for RSU vesting income on a W-2.
- Internal Revenue Service (IRS).“Topic No. 409, Capital Gains and Losses.”Summarizes how gains and losses are computed and reported when you sell vested shares.
- Internal Revenue Service (IRS).“Publication 550, Investment Income and Expenses.”Covers basis and reporting concepts used for stock sales after RSUs vest.