You earned a $10,000 bonus, the deposit hits, and somehow only about $6,600 lands in your account. It can feel like the government just confiscated a third of your reward. The good news: bonuses are not taxed at some special, punishing rate. What you're seeing is withholding, an upfront estimate, not your final tax bill. The actual tax on your bonus is reconciled when you file your return, and many people get a chunk of that withholding back as a refund.
This guide explains exactly how bonuses are taxed in 2025: the 22% federal supplemental flat rate (and the 37% rate on amounts over $1 million), the FICA taxes that still apply, how state tax fits in, and the two methods employers use to calculate withholding. We'll walk through a full $10,000 example in dollars so you can see where every penny goes.
This article is for general informational and educational purposes only and is not professional tax advice. Tax rules are complex and your situation is unique, so consult a qualified tax professional or CPA before making decisions.
Bonuses Are "Supplemental Wages"
To the IRS, a bonus isn't ordinary salary, it's a supplemental wage. That category also includes commissions, overtime, severance, back pay, awards, and accumulated sick leave. Because supplemental wages are paid outside your normal salary rhythm, the IRS gives employers special rules for how much tax to withhold from them.
The single most important thing to understand is the difference between withholding and tax owed:
- Withholding is the money your employer sets aside from your bonus and sends to the IRS on your behalf, before you ever see it. It's a prepayment.
- Tax owed is what you actually owe, calculated on your total annual income when you file your return.
These two numbers are rarely identical. If too much was withheld from your bonus, you get the difference back as a refund. If too little was withheld, you'll owe more at filing. Your bonus is simply added to the rest of your income and taxed at your real marginal rate, no special bonus penalty exists.
The 22% Federal Supplemental Flat Rate
The most common way employers handle bonus withholding is the percentage method, also called the flat-rate method. For supplemental wages, the IRS sets a flat federal withholding rate of 22%. So on a $10,000 bonus, your employer withholds $2,200 for federal income tax, regardless of your normal paycheck withholding.
There's an important exception for very large bonuses. Once your total supplemental wages for the year exceed $1 million, the portion above that threshold is withheld at a flat 37%, the top federal income tax rate. For the vast majority of workers this never comes into play, but it's why you'll sometimes hear that bonuses are taxed at 37%, that only applies to the seven-figure slice.
The 22% flat rate is convenient, but it can be a poor match for your actual situation:
- If your true marginal bracket is below 22% (say 10% or 12%), too much is withheld, and you'll likely see it back as a refund.
- If your marginal bracket is above 22% (24%, 32%, 35%), the flat 22% may not be enough, and you could owe more at tax time.
FICA Taxes Still Apply to Every Bonus
Federal income tax withholding isn't the only bite out of your bonus. FICA taxes, the payroll taxes that fund Social Security and Medicare, apply to bonuses just like any other wages:
- Social Security tax: 6.2%, applied to wages up to the 2025 wage base of $176,100. Once your total wages for the year cross that ceiling, no more Social Security tax is withheld.
- Medicare tax: 1.45%, with no wage cap. High earners also pay an additional 0.9% Medicare surtax on wages above $200,000 (single).
Combined, the standard FICA rate is 7.65%. On a $10,000 bonus, that's $765 set aside before you even think about income tax. Unlike income tax withholding, FICA is generally a true cost, it's not refunded at filing (barring an over-the-cap overpayment from multiple employers).
Don't Forget State and Local Taxes
Most states with an income tax also tax bonuses, and many have their own supplemental withholding rates that range from roughly 2% to over 10%. A handful of states, Texas, Florida, Tennessee, Washington, Nevada, South Dakota, Wyoming, and Alaska, have no state income tax, so residents there skip this step entirely.
Because state rules vary so widely, the example below uses a 5% state rate for illustration. Check your own state's supplemental rate, or better yet, run your numbers through our Bonus Tax Calculator, which lets you plug in your state to see the real net.
A Fully Worked $10,000 Bonus Example
Let's put it all together. Imagine you receive a $10,000 bonus, your employer uses the percentage method, and you live in a state with a 5% supplemental rate. Here's how the withholding breaks down:
| Item | Rate | Amount Withheld |
|---|---|---|
| Gross bonus | — | $10,000.00 |
| Federal supplemental withholding | 22% | $2,200.00 |
| Social Security | 6.2% | $620.00 |
| Medicare | 1.45% | $145.00 |
| State income tax (example) | 5% | $500.00 |
| Total withheld | 34.65% | $3,465.00 |
| Take-home bonus | — | $6,535.00 |
So you'd pocket about $6,535 of your $10,000 bonus after withholding. That feels steep, but remember, $2,200 of that is just a federal income tax prepayment. If your actual marginal rate is 12%, your true federal tax on this bonus is closer to $1,200, meaning roughly $1,000 comes back to you at filing. The FICA ($765) and state tax ($500) are generally final, but the income tax portion gets reconciled.
To see your personal numbers, including your exact state rate and how the bonus stacks on your annual income, use our Bonus Tax Calculator. To understand how it affects your overall paycheck, pair it with the Take-Home Pay Calculator.
Percentage Method vs. Aggregate Method
Employers can choose between two IRS-approved methods to calculate federal withholding on a bonus. Knowing which one your employer uses explains why your withholding looks the way it does.
1. The percentage method (flat 22%). This is what we used above. The bonus is treated separately from your regular paycheck and withheld at a flat 22% for federal income tax. It's simple, predictable, and the most common approach, especially when the bonus is paid as a separate check.
2. The aggregate method. Here, the employer combines your bonus with your most recent regular paycheck, calculates withholding on the lump sum as if that's your normal pay for the period, then subtracts what was already withheld on the regular wages. Because that combined amount can push you into a higher temporary withholding bracket, the aggregate method often withholds more upfront than the flat 22%, sometimes a lot more.
| Feature | Percentage Method | Aggregate Method |
|---|---|---|
| How it works | Flat 22% on the bonus | Bonus added to a regular check, taxed on W-4 |
| Typical withholding | Predictable, often lower | Often higher, can spike |
| Common for | Separate bonus checks | Bonus bundled into a normal paycheck |
| Final tax impact | Same at filing | Same at filing |
The key takeaway: both methods produce the same final tax bill. The method only changes how much is withheld upfront. If the aggregate method took a big bite now, you're more likely to get it back later. Withholding is timing, not the final verdict.
Why Withholding Is Not Your Final Tax
This is the single most misunderstood part of bonus taxation, so it's worth restating plainly. When you file your annual tax return, the IRS doesn't care which method your employer used or that 22% was withheld. It adds your bonus to all your income for the year, applies the standard deduction ($15,750 for single filers, $31,500 for married filing jointly in 2025) or your itemized deductions, and calculates your actual tax using the progressive tax brackets.
The total tax you owe is then compared against everything withheld all year, from regular paychecks and bonuses alike. If you overpaid, you get a refund. If you underpaid, you write a check. Your bonus was never taxed at a special rate, it just had a flat rate withheld. Want to estimate your true tax on your full income? Run it through our Federal Income Tax Calculator.
Smart Ways to Reduce the Tax on Your Bonus
You can't change the withholding rules, but you can lower the actual tax you owe on a bonus by funneling it into tax-advantaged accounts:
- Contribute to your 401(k). If your employer allows it, directing bonus money into a traditional 401(k) reduces your taxable income now. The 2025 employee contribution limit is $23,500 (plus a catch-up if you're 50 or older).
- Fund a traditional or Roth IRA. The 2025 IRA contribution limit is $7,000 ($8,000 if you're 50+). A traditional IRA contribution may be deductible depending on your income and workplace coverage.
- Use an HSA if you have a high-deductible health plan, contributions are pre-tax and grow tax-free for medical expenses.
- Defer the timing if you have any say, receiving a bonus in a lower-income year can reduce its marginal tax bite.
Keep in mind that 401(k) contributions reduce income tax but not FICA, Social Security and Medicare still come out. And remember that retirement accounts have their own rules down the road; traditional accounts, for instance, require minimum distributions starting at age 73.
The Bottom Line
Bonuses are taxed as ordinary income, period. The reason they feel punishing is that the 22% federal supplemental withholding (37% on amounts over $1 million), plus 7.65% FICA and any state tax, gets pulled out upfront. On a $10,000 bonus in a 5% state, that's about $3,465 withheld and $6,535 in your pocket. But withholding is a prepayment, not your final tax. Whether your employer uses the percentage or aggregate method, the IRS reconciles everything at filing, and if too much was withheld, you get it back.
Before you spend your next bonus, estimate the real numbers with our Bonus Tax Calculator, see how it changes your paycheck with the Take-Home Pay Calculator, and check your total annual liability with the Federal Income Tax Calculator.
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