Your bonus isn’t actually taxed at a higher rate than the rest of your pay. It just had more money withheld from it up front. The reason your bonus looks so heavily taxed is that the IRS treats bonuses as “supplemental wages” and requires employers to use special withholding rules, and those rules usually pull out more than your real tax rate requires. Most employers withhold a flat 22% for federal income tax on the bonus alone, before FICA and state taxes take their cut. The gap between what got withheld and what you actually owe gets sorted out when you file your return.
The Two Withholding Methods Employers Use
Your employer chooses between two methods for federal income tax withholding on a bonus. Both tend to overshoot, but they overshoot differently.
The Flat 22% Method
When a bonus is paid on its own, separate from your regular paycheck, most employers withhold a flat 22% for federal income tax. Your W-4, your filing status, and your actual income level are ignored. A $10,000 bonus loses $2,200 to federal withholding on the spot, whether you’re in the 12% bracket or the 32% bracket.1Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
If your total supplemental wages from one employer exceed $1 million in a calendar year, the excess is withheld at 37%, and your W-4 has no effect on that portion.1Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
The Aggregate Method
The second approach lumps your bonus into your regular paycheck and calculates withholding on the combined total as if that inflated amount were your normal pay. This is where the math gets painful.
Say you normally earn $3,000 per biweekly period and your employer adds a $10,000 bonus, bringing the check to $13,000. The payroll system annualizes that as $338,000 and withholds accordingly. For a single filer in 2026, $338,000 sits squarely in the 35% bracket.2Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 The system then subtracts what it would have withheld on your regular $3,000 alone, and the entire difference comes out of the bonus portion. The effective withholding rate on the bonus can far exceed your actual marginal rate.
Your employer isn’t required to tell you which method they used, but your payroll department will usually answer if you ask. Some companies let you request a preference; many don’t.
FICA and State Taxes Come Out Too
Federal income tax withholding is only part of what shrank your check. FICA applies to bonuses exactly as it applies to regular wages.
Social Security tax takes 6.2%, as long as your cumulative wages for the year haven’t yet passed the $184,500 wage base for 2026.3Social Security Administration. Contribution and Benefit Base Medicare takes another 1.45% with no cap.4Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates If your wages from that employer exceed $200,000 for the year, an extra 0.9% Medicare tax comes out of the amount above that threshold.
Then state income tax adds another layer. States that tax supplemental wages either use their own flat rate or apply the aggregate method. Flat rates on bonuses run from roughly 1.5% to over 11%, depending on the state. A few states don’t tax income at all. Between federal withholding, FICA, and state taxes, losing 35% to 45% of a bonus to combined withholding is typical.
Withholding Isn’t Your Actual Tax Bill
Here’s the part that matters most: the money withheld from your bonus is a prepayment, not the final tax. Your bonus is ordinary income, taxed at the same marginal rate as everything else you earn. There is no separate “bonus tax rate.”
When you file Form 1040, the IRS totals all your W-2 income for the year and calculates what you actually owe.5Internal Revenue Service. Understanding Taxes – Module 2: Wage and Tip Income All the withholding from every paycheck and bonus gets added up and compared to that liability. If your employer over-withheld, the excess comes back as a refund. If they under-withheld, you owe the difference.
For a single filer in 2026, the 22% federal tax bracket doesn’t start until taxable income passes $50,400, and the standard deduction is $16,100.2Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026 Someone earning $70,000 with no other deductions has taxable income of about $53,900 and an effective federal tax rate closer to 12%. Having 22% withheld from a bonus clearly overshoots. That extra money comes back at tax time.
When 22% Isn’t Actually Enough
Higher earners run into the opposite problem, and it’s the more expensive one. If your taxable income sits in the 24%, 32%, or 35% bracket, the flat 22% on your bonus is short of what you’ll owe on those dollars. You could face a balance due at filing time, plus an underpayment penalty if the shortfall across the year is large enough.
The 24% bracket starts at $105,700 of taxable income for a single filer in 2026, which is roughly $122,000 of gross wages after the standard deduction. A $20,000 bonus for someone in the 32% bracket generates about $6,400 in federal tax; only $4,400 gets withheld at 22%. That $2,000 gap has to be paid somewhere.
You avoid an underpayment penalty if your total withholding and estimated payments cover at least 90% of your current-year tax or 100% of last year’s tax (110% if your prior-year adjusted gross income exceeded $150,000).6Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty A big bonus that pushes you well past last year’s income can knock out both safe harbors unless you adjust.
How to Fix Your Withholding
You don’t have to wait until April to settle this. The IRS Tax Withholding Estimator lets you enter your year-to-date income, including the bonus, and see whether your remaining withholding will land you close to zero. The tool produces a pre-filled Form W-4 you can hand to your payroll department.7Internal Revenue Service. Tax Withholding Estimator
If you were over-withheld, dialing down withholding on the paychecks left in the year effectively refunds you now rather than in the spring. If you were under-withheld, line 4(c) on Form W-4 lets you request extra withholding per paycheck for the rest of the year.8Internal Revenue Service. Form W-4, Employee’s Withholding Certificate
Another option, if you can arrange it before the bonus is processed: route some or all of it into a traditional 401(k). Pre-tax deferrals reduce the taxable amount of that paycheck dollar for dollar. The 2026 employee contribution limit is $24,500, with an $8,000 catch-up if you’re 50 or older, or $11,250 if you’re 60 through 63.9Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Not every employer permits a separate bonus deferral election, so check with HR first. Roth 401(k) contributions won’t help here because they’re made with after-tax dollars.
Gift Cards, Trips, and Other Non-Cash Bonuses
If your bonus came as a gift card, a trip, or merchandise, it’s still taxable. The IRS values it at fair market value, meaning what you’d pay for it in the open market rather than what your employer paid.10Internal Revenue Service. Employer’s Tax Guide to Fringe Benefits Your employer should add that value to your W-2 and withhold accordingly.
Small, infrequent perks like a holiday turkey can qualify as de minimis fringe benefits and stay out of income. Cash and gift cards never qualify, no matter the amount. A $25 gift card is taxable.11Internal Revenue Service. De Minimis Fringe Benefits