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If part of your pay comes as RSUs, your stock and your taxes are now tangled together, and the rules are not obvious. The short version: you get taxed once when the shares land, and maybe again when you sell them. Miss how that works and you can end up with a surprise bill or, worse, paying tax twice on the same money.
This guide breaks down how RSUs get taxed from start to finish, in plain language. We will walk through what they are, the tax hit at vesting, why too little often gets set aside, what happens when you sell, and the one reporting mistake that trips up almost everyone.
A restricted stock unit is a promise from your employer to give you shares of company stock later, once you have earned them.
An RSU is a form of equity compensation, and one of the most common, especially in tech. RSU grants come with a vesting schedule, and when you first get them you do not own anything yet. You own a promise. The shares only become yours when they vest, which usually happens over time, say 25% a year over four years, or when the company hits a milestone. You recognize income when they vest, not before. Until then there is nothing to tax, because you hold units, not stock. This is where RSUs work differently from options: there is no price to pay and no decision to exercise. When that day comes, the shares simply show up in your account, and that is the moment the tax story begins.
Here is the core idea to hold onto: RSUs get taxed at two separate moments, and confusing them is where most mistakes start.
The first is when the shares become yours and the value counts as income. The second is selling, when any change in the stock price afterward counts as a capital gain or loss. Each moment has its own rules, its own rate, and its own paperwork. Get the two straight and the rest falls into place. Get them tangled and you risk overpaying. Let us take them one at a time.
When your RSUs vest, the fair market value of the shares that day is taxed as ordinary income, exactly like salary or a bonus.
So if 1,000 shares vest when the stock price is $50, you have $50,000 of income for the tax year. That amount gets added to your W-2 and is subject to federal income tax, Social Security, Medicare, and state income tax. Because this income stacks on top of your salary, it can push you into a higher tax bracket, and it is taxed at your ordinary income tax rate rather than any special equity rate. This is the part people forget: RSU vesting creates a tax liability the moment the shares land, whether or not you sell a single share. You owe ordinary income tax on the full value, so vested RSUs are income first and an investment second, and they're taxed like wages. This income shows up bundled into your pay, not on a separate line, which is part of why it sneaks up on people at tax time.
Your employer withholds taxes the moment shares land, but here is the catch that costs people thousands: the amount taken out is often not enough.
Most companies handle it with what is called sell-to-cover. On that date, they automatically sell a portion of your shares to cover the taxes, then drop the remaining shares into your brokerage account. The trouble is the rate. The IRS treats RSU income as supplemental wages, so employers withhold federal tax at a flat 22%, or 37% on amounts above $1 million in a year. If your real marginal rate is 32% or 35%, that 22% leaves a gap. On a $100,000 grant, the company might hold back $22,000, but if you really owe closer to 35%, you are short about $13,000 when you file. That shortfall becomes additional tax you owe, and it can even trigger an underpayment penalty.
The fix is to plan for it. Set aside cash to cover taxes the withholding leaves short, ask whether your company can withhold taxes at a higher rate, or make an estimated tax payment during the year. Knowing the total tax you owe before April beats getting blindsided, and it lets you pay the tax on your terms. A higher-than-expected payout can quietly increase your tax bill, so it pays to run the numbers as shares land rather than after.
Once shares are yours, selling them is a second, separate tax event. This is where capital gains come in.
Your cost basis in the shares is their fair market value the day they vest, the same amount already taxed as income. When you sell the stock, you pay capital gains tax only on the change in price since then. Sell right away and the sale price is close to your basis, so the gain is tiny or zero. Hold, and the rest depends on time. Sell the shares within a year and you have short-term capital gains, taxed at your ordinary rate, so the short-term capital gains tax matches your wage rate. Hold for more than a year and you get long-term capital gains tax rates instead, which top out at 20% and are usually far kinder. That lower long-term capital gains tax is the reason some people hold their RSU shares past the one-year mark, watching the RSU value rise while betting on the stock. The value of the RSUs after that is all the gain measures. For tax purposes, the holding clock starts the day the shares vest, not the day they were granted.
This is the single most common mistake people make, and it is worth slowing down for because it can cost you real money.
When you sell vested shares, your broker sends a Form 1099-B. The problem is that the 1099-B often shows a cost basis of $0 or leaves it blank, because the broker does not know that the vest-day value was already taxed as wages on your W-2. If you report the sale using that $0 basis, the IRS treats the entire sale as a capital gain and you get taxed twice on the same income. The correct move is to use Form 8949 to report the sale with the right basis, the fair market value at vesting, taken from the supplemental statement your brokerage provides. Comparing your own records against the broker's tax forms before you file your tax return is the only way to catch this. If you have read our guide on Form 8949, this is exactly the kind of adjustment those columns exist for.
People lump RSUs and options together, but they are taxed quite differently, and the difference matters.
Unlike stock options, RSUs have no strike price and no purchase decision. Options can lose all their value if the share price falls below the strike, and you choose if and when to exercise. RSUs are simpler and steadier: they are worth something as long as the stock is worth anything, and they get taxed automatically when they land, whether you act or not. That certainty is the upside. The downside is that you cannot defer the income the way an option holder sometimes can, so the tax arrives on schedule, ready or not.
A bit of foresight turns RSUs from a tax headache into the asset they are meant to be. The goal is simple: no surprises and no money left on the table.
Good RSU tax planning means tracking each vest, knowing your real bracket, covering the withholding gap, and deciding with intention whether to sell or hold. The tax implications stretch across the grant, the hold, and the eventual sale, so getting your RSU taxes right is part tax preparation and part year-round tax withholding strategy. Done well, you can reduce your tax burden by timing sales for long-term rates, avoid the double-tax trap entirely, and walk into tax season without dread. A good tax preparer will also check whether a large vest affects a tax credit you counted on, since a big year can phase one out. This is detailed work that rewards a careful hand, which is where a partner earns its keep. Madras Accountancy supports U.S. CPA firms with equity compensation reporting, from reconciling vest-day values to correcting cost basis and tying RSU sales back to the return. For firms whose clients are high earners, where the withholding gap bites hardest, and for anyone navigating capital gains on a sale, clean records are what keep the tax bill honest.
Treat your RSUs as the real income they are, and they become a genuine reward rather than an April ambush.
RSUs get taxed twice. At vesting, the fair market value of the shares is taxed as ordinary income and added to your W-2. When you later sell the shares, any gain since then is taxed as a capital gain, short-term if you held a year or less, long-term if you held longer.
Both, but on different amounts. You pay income tax on the full value when the RSUs settle. You then pay tax only on the change in price between settlement and selling. Selling right away usually produces little or no extra gain.
Because employers take federal tax from RSU income at the flat 22% supplemental rate, which is often below a high earner's real marginal rate of 32% to 37%. The difference is additional tax you owe at filing. Setting aside cash or making estimated payments covers the gap.
Your cost basis is the fair market value of the shares on the day they vested, the same amount already taxed as income. Using that basis when you sell ensures you only pay capital gains tax on the price change after that, not on the whole value again.
Not really, but a reporting error can make it look that way. The vest-day value is taxed as income, and only the later gain is taxed again. Trouble comes when a 1099-B shows a $0 basis. You correct it on Form 8949 so the same income is not taxed twice.
RSUs have no strike price and are taxed as regular income automatically when they vest. Options require you to exercise, can expire worthless if the stock falls, and follow different tax rules. RSUs hold value as long as the company stock does.
Usually yes. The vest-day value is subject to state income tax along with federal, withheld at that point in most states. The exact amount depends on where you live and work, and high earners sometimes face extra state surcharges on large grants.
That is part tax question, part investment question. Holding more than a year shifts future gains to lower long-term rates, but it also concentrates your money in one stock. Many people sell right away to diversify and revisit the decision with a tax professional.
This is general information about how RSUs get taxed, not tax advice for your specific situation. Tax brackets and rules change, so confirm the current details or consult a tax advisor before making decisions about your restricted stock units.
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