Under federal law, bonuses and commissions are taxed the same way. The IRS classifies both as supplemental wages, which means identical withholding rules, the same Social Security and Medicare obligations, and the same treatment on your W-2 and tax return. The rate your employer withholds from either payment is a prepayment toward your annual tax bill, not the final rate you actually pay.
Why Bonuses and Commissions Share One Set of Rules
IRS Publication 15 (Circular E) defines supplemental wages as any payment to an employee that is not regular wages. Bonuses and commissions both sit in that category, along with overtime, severance, back pay, awards, and prizes.1Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide There is no separate provision for commissions versus bonuses. A quarterly sales commission, an annual performance bonus, and a one-time signing bonus all follow the same withholding formulas and the same payroll tax rules.
Regular wages are the predictable amounts you earn each pay period at your normal hourly or salaried rate. Everything paid on top of that is supplemental. Because the IRS groups these payments together, your employer applies one set of calculations whether it’s writing you a commission check or a bonus check.
Withholding Is Not Your Actual Tax Rate
The most common misconception about supplemental pay is that bonuses and commissions are “taxed higher” than salary. They aren’t. The percentage taken out of a bonus check is a withholding rate, not a tax rate. Your real tax is determined at year-end based on your total income, filing status, and deductions.
If your overall taxable income lands in the 12% federal bracket, a 22% withholding on your bonus was more than you owe, and the excess comes back as a refund. If your income places you in the 32% bracket, 22% was not enough, and you’ll owe the difference in April. The withholding rate is simply a collection mechanism. The return settles the bill.
How Employers Withhold on Bonuses and Commissions
Employers use one of two methods to calculate federal income tax withholding on supplemental wages. Employees usually cannot choose which one applies.
The Flat 22% Method
When a bonus or commission is identified separately from regular wages and your cumulative supplemental pay for the year stays at or below $1 million, the employer may withhold a flat 22% for federal income tax. No other flat percentage is permitted.1Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide The math is simple: multiply the payment by 0.22.
The Aggregate Method
Under the aggregate method, the employer combines the supplemental payment with your regular wages for the current pay period and withholds as if the whole thing were one larger paycheck, using the information on your W-4.2eCFR. 26 CFR 31.3402(g)-1 – Supplemental Wage Payments Because the combined figure is larger than your normal check, the withholding tables can pull part of the payment into a higher bracket for that pay period. That often produces a higher withholding percentage than the flat 22% method. It does not mean you owe more; it means more was prepaid.
Supplemental Pay Above $1 Million
Once your cumulative supplemental wages from a single employer cross $1 million in a calendar year, the employer must withhold 37% on every dollar above that threshold, matching the top individual tax bracket. Your W-4 has no effect on this rate.1Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
Social Security and Medicare Apply the Same Way
Bonuses and commissions carry the same payroll tax obligations as regular wages. Both are subject to Federal Insurance Contributions Act (FICA) taxes.
Social Security tax is 6.2% for you and 6.2% for your employer on earnings up to the annual wage base limit.3Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates For 2026, that limit is $184,500.4Social Security Administration. Contribution and Benefit Base Once your total wages for the year (salary plus every bonus and commission combined) pass $184,500, neither you nor your employer owes any more Social Security tax on the excess. A large mid-year commission can push you past that ceiling faster than expected, and later paychecks may show higher net pay once Social Security withholding stops.
Medicare tax is 1.45% on all earnings with no cap.3Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates Every dollar of every bonus and every commission check is subject to it.
An Additional Medicare Tax of 0.9% kicks in once wages cross filing-status thresholds: $200,000 for single or head of household, $250,000 for married filing jointly, and $125,000 for married filing separately. Your employer must start withholding the extra 0.9% once your pay from that employer exceeds $200,000, regardless of how you file.5Internal Revenue Service. Questions and Answers for the Additional Medicare Tax You reconcile any over- or under-withholding on your return.
How Both Show Up on Your W-2 and Return
At year-end, your employer combines regular wages, bonuses, and commissions into one figure in Box 1 of your W-2, labeled “Wages, tips, other compensation.” The total federal income tax withheld across the year—whether by the flat method, the aggregate method, or a mix—appears in Box 2.6Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3 By the time you file, there is no visible distinction between your salary and your supplemental pay.
You report the Box 1 total on Form 1040 as wage income. The IRS then computes your actual tax based on total income minus deductions. The 2026 standard deduction is $16,100 for single filers and $32,200 for married couples filing jointly.7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026, Including Amendments From the One, Big, Beautiful Bill If your withholding exceeded what you owe, you get a refund. If it fell short, you pay the difference.
If You Earn Commissions as an Independent Contractor
Everything above assumes you’re a W-2 employee. If you earn commissions as an independent contractor, the rules change. Businesses that pay you $600 or more during the year report the payments on Form 1099-NEC instead of a W-2.8Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC
No federal income tax or FICA is withheld from a contractor’s commission checks. You owe self-employment tax on net earnings at 15.3% (12.4% Social Security up to the $184,500 wage base plus 2.9% Medicare), which covers both the employee and employer shares. The Additional Medicare Tax of 0.9% applies once your self-employment income crosses the same filing-status thresholds noted above. You’re also responsible for quarterly estimated tax payments to avoid penalties.
Planning Around a Big Bonus or Commission Check
Because withholding on supplemental pay often over- or undershoots your actual bracket, a few steps can smooth out the result at filing time.
- Increase your 401(k) contribution before a large payment. Traditional 401(k) deferrals reduce your taxable income for the year. The 2026 employee contribution limit is $24,500, with an extra $8,000 catch-up at age 50 and older.9Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
- Update your W-4 to request additional withholding from regular paychecks if you know a large bonus or commission is coming and you expect the flat rate to fall short of your bracket.
- Make a quarterly estimated payment for the shortfall if your bracket is well above 22%.
- Contribute to a health savings account if you’re on a high-deductible plan. HSA contributions reduce taxable income and are exempt from FICA.
The IRS waives the underpayment penalty if your total payments cover at least 90% of the current year’s tax, or 100% of the prior year’s tax (110% if your prior-year adjusted gross income was over $150,000, or $75,000 if married filing separately), or if you owe less than $1,000 at filing.10Internal Revenue Service. Estimated Tax For workers whose commissions swing year to year, matching last year’s tax is usually the easiest safe harbor because it doesn’t require predicting the current year.