Yes, commission income is taxed. The IRS treats every dollar of commission as compensation for services, so it counts toward your gross income and is subject to federal income tax, Social Security tax, and Medicare tax.1GovInfo. 26 USC 61 – Gross Income Defined What changes based on your situation is how the tax is collected: employees have it withheld from their paychecks, and independent contractors pay it themselves through estimated payments and self-employment tax.
How Commissions Are Withheld If You’re an Employee
For withholding purposes, commissions are classified as supplemental wages, the same category that covers bonuses, overtime, and back pay.2eCFR. 26 CFR 31.3402(g)-1 – Supplemental Wage Payments That label controls which of two withholding methods your employer applies.
The Percentage Method
If your employer pays the commission separately from your regular wages, or identifies the commission amount within a combined payment, they can withhold a flat 22% for federal income tax. Your W-4 elections don’t affect this rate.3Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide A $5,000 commission would have $1,100 withheld under this method.
The Aggregate Method
If the commission is paid together with your regular wages without being broken out, payroll adds the two together and withholds as if you earned that combined amount every pay period, using the standard tables and your W-4.3Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide This often produces a bigger withholding hit than the percentage method, because the one-time spike gets treated as if it were your new baseline. If you normally earn $2,000 per period and receive a $4,000 commission on top, the system calculates as though you earn $6,000 every period for the whole year.
Social Security and Medicare
Commissions are also subject to FICA. Social Security tax is withheld at 6.2% up to the annual wage base, and Medicare tax is withheld at 1.45% on every dollar with no cap.4GovInfo. 26 USC 3101 – Rate of Tax For 2026 the Social Security wage base is $184,500.5Social Security Administration. Contribution and Benefit Base Once your total wages (including commissions) pass that number, Social Security withholding stops for the rest of the year. Medicare keeps going, and an extra 0.9% Medicare surtax kicks in on wages above $200,000, or $250,000 for married couples filing jointly.6Internal Revenue Service. Topic No. 560, Additional Medicare Tax
Why a Commission Check Can Look Overtaxed
Whatever method your employer uses, withholding is just a running estimate. When you file, the IRS reconciles the total withheld against your actual liability based on your real income, deductions, and credits. If more was withheld than you owe, you get the difference back as a refund. If you worked for more than one employer and too much Social Security tax was withheld in total because each employer applied the wage base separately, you can claim the excess as a credit on your return.7Internal Revenue Service. Topic No. 608, Excess Social Security and RRTA Tax Withheld So the heavier withholding on a commission paycheck usually isn’t a permanent tax; it’s tax collected earlier.
How Commissions Are Taxed If You’re an Independent Contractor
When you earn commissions as a contractor, no one withholds anything from your payments. You owe the same income tax an employee would, plus self-employment tax to cover both the employee and employer sides of FICA. The combined self-employment rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.8Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax
The Social Security piece applies only to net self-employment income up to $184,500 in 2026.5Social Security Administration. Contribution and Benefit Base Medicare applies to all of it, and the additional 0.9% surtax hits net self-employment income above $200,000, or $250,000 for joint filers.6Internal Revenue Service. Topic No. 560, Additional Medicare Tax One partial offset: you can deduct half of your self-employment tax when calculating your adjusted gross income, whether or not you itemize.9Social Security Administration. If You Are Self-Employed
Estimated Payments and Safe Harbors
Because no one is withholding for you, the IRS expects quarterly estimated payments covering both income tax and self-employment tax. For calendar-year taxpayers the due dates are April 15, June 15, September 15, and January 15 of the following year.10Internal Revenue Service. Publication 509 (2026), Tax Calendars Payments can be made electronically or by mailing Form 1040-ES vouchers.11Internal Revenue Service. Estimated Taxes
You avoid the underpayment penalty if your payments add up to at least 90% of your current-year tax or at least 100% of your prior-year tax, whichever is smaller. If your prior-year adjusted gross income was above $150,000 (or $75,000 if married filing separately), the prior-year threshold rises to 110%.12Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax You also avoid it if you’ll owe less than $1,000 after withholdings and credits.11Internal Revenue Service. Estimated Taxes
The Forms You’ll Receive
Employees get a Form W-2. Commission income is folded into Box 1 (total taxable wages and compensation), and federal income tax withheld appears in Box 2.13Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3 Cross-check the total against your final pay stubs.
Independent contractors who received $600 or more in a year get a Form 1099-NEC, with the full commission amount reported in Box 1 as nonemployee compensation.14Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC That figure goes on Schedule C, where you subtract business expenses to arrive at net profit; the net profit then flows to your Form 1040 and drives your self-employment tax calculation.15Internal Revenue Service. Instructions for Schedule C (Form 1040) If a 1099-NEC amount doesn’t match your records, ask the payer for a corrected form before filing.
Business Expenses That Reduce the Tax
Filing Schedule C lets you deduct ordinary and necessary business expenses from your gross commissions before either income tax or self-employment tax is calculated. Common ones for commission-based workers:
- Vehicle costs, using either actual expenses or the 2026 standard mileage rate of 72.5 cents per mile, plus parking and tolls.16Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile
- Home office expenses when a space is used exclusively and regularly for business; the simplified method gives $5 per square foot up to 300 square feet, a $1,500 maximum.17Internal Revenue Service. Publication 587, Business Use of Your Home
- Travel and meals: lodging and transportation for overnight business travel are fully deductible; business meals are 50% deductible.15Internal Revenue Service. Instructions for Schedule C (Form 1040)
- Fees paid to accountants and attorneys for business-related work.
- Office supplies, postage, software subscriptions, and other tools of the trade.
One boundary to know: W-2 employees who earn commissions generally cannot deduct unreimbursed business expenses on their federal return. That deduction was suspended through 2025 and has not been restored for 2026. The deductions above are available only if you’re filing Schedule C as a contractor.
State Income Tax on Commissions
Most states with an income tax also tax commissions. Some apply a flat supplemental withholding rate similar to the federal 22%, while others require employers to run commissions through the regular progressive tables. Flat rates vary widely between states, and a handful of states don’t tax income at all, so no state withholding applies to commissions earned there. Your state’s department of revenue publishes the specific rate and method.