Why Is Commission Taxed So High? The 22% Withholding Rule

Commission is taxed at the same rates as the rest of your income, but it’s withheld differently, and that’s what makes the check look so small. The IRS treats commissions as “supplemental wages,” which lets your employer pull a flat 22% for federal income tax off the top before Social Security, Medicare, and state tax take their share. Add those together and more than 30% of a commission payment can disappear before it hits your account, even when your actual year-end tax rate is far lower.

Supplemental Wages and the Flat 22% Rule

The IRS divides employee pay into two buckets. Regular wages are the predictable amounts on your normal paycheck. Supplemental wages are everything else: commissions, bonuses, overtime, severance, back pay, awards, and certain fringe benefits.¹

That label matters because employers are allowed to withhold on supplemental wages using a flat percentage instead of running them through the normal W-4 tables. The rate is 22%. When your commission is paid as a separate check, or identified separately on a combined check, payroll can simply multiply the gross by 0.22 and send that amount to the government.¹ Treasury regulations authorize the method and list commissions specifically as supplemental wages.²

Payroll departments like the flat method because it’s easy. The catch is that 22% is often more than a worker actually owes. For 2026, a single filer doesn’t reach the 22% marginal bracket until taxable income passes $50,400. If most of your income sits in the 12% bracket, the flat withholding is close to double your real rate on that money. You’ll get the excess back at tax time, but not before.

When Employers Use the Aggregate Method Instead

Some employers, especially when they pay commission on the same check as regular wages, use the aggregate method. The payroll system adds the commission to your regular pay for that period, then treats that combined total as if you earn it every pay period, all year long.¹

The math gets ugly fast. If you normally take home $3,000 biweekly and get a $10,000 commission in that period, the software calculates withholding as though you earn $13,000 every two weeks. That’s about $338,000 annualized. It applies the tax tables to that inflated projection, subtracts what it already withheld from your regular wages, and pulls the difference out of the commission itself.

Depending on the size of the commission compared to your normal pay, the aggregate method can hit harder than the flat 22%. The software has no way to know the payment is a one-time event, so it treats every dollar as if it will repeat.

Social Security, Medicare, and State Tax on Top

Federal income tax withholding is only one layer. Every dollar of commission is also subject to FICA and, in most states, state income tax.

Social Security takes 6.2% of your gross commission, up to the 2026 wage base of $184,500 in total annual earnings. Once your cumulative wages hit that ceiling, Social Security stops coming out of later checks.³⁴
Medicare takes 1.45% with no income cap.³
If your total wages for the year pass $200,000, your employer must start withholding an extra 0.9% Additional Medicare Tax on amounts above that line. A large commission that pushes you across $200,000 mid-year triggers it immediately.⁵

Stack the flat 22% federal withholding with 6.2% Social Security and 1.45% Medicare and you’re already at 29.65% before state tax. States that impose supplemental withholding of their own run roughly from 1.5% to over 11%, which can push the total deduction past 35% of the gross. That’s the number people see on the pay stub, and it’s why commission checks feel punished even though no punitive rate exists in the tax code.

Your Actual Tax Rate Is Almost Always Lower

The 22% flat rate is a withholding shortcut, not a description of what you owe. Federal income tax runs on a progressive bracket system. Your first dollars are taxed at 10%, the next layer at 12%, and so on. For 2026, a single filer doesn’t reach the 22% bracket until taxable income tops $50,400, and a married couple filing jointly doesn’t reach it until $100,800.

Effective tax rate — the share of your total income you actually pay in federal income tax — is almost always lower than your top bracket. A single filer earning $75,000 in 2026 pays 10% on the first $12,400, 12% from $12,401 to $50,400, and 22% only on income above $50,400. That comes out to roughly 14% effective, well below the 22% withheld from a commission. The $15,700 standard deduction for single filers pushes the real rate down further.

The withholding system errs on the side of collecting too much rather than too little. That’s the whole mismatch. It’s not a penalty on commissions; it’s a blunt instrument applied to an irregular payment.

How to Keep More of Each Commission Check

You can’t choose between the flat 22% method and the aggregate method. That’s the employer’s call. What you can do is adjust your W-4 so your overall withholding lands closer to what you actually owe, instead of loaning the government the difference until you file.

Start with the IRS Tax Withholding Estimator. The free tool accounts for irregular commission income, deductions, credits, and multiple income sources, and it tells you what W-4 settings will get you close to your real liability.⁶

Then submit a new Form W-4 to your employer. Step 4(b) lets you claim deductions beyond the standard deduction, which lowers the income your employer uses to calculate withholding on your regular wages. Step 4(c) lets you request a specific extra dollar amount per pay period if you’re under-withheld, or you can leave it blank and use the other steps to reduce withholding overall.⁷

If you know roughly when your biggest commissions will hit, you can also time W-4 changes around them. Lower withholding on regular paychecks before a heavy commission period, then switch back once it passes. The goal is annual total withholding that matches annual liability, not check-by-check precision.

Getting the Overage Back When You File

Withholding is an estimate. When you file your Form 1040, you calculate your real tax liability for the year based on your full income, deductions, and credits, and the IRS refunds anything overpaid.⁸

For workers whose pay is heavily commission-based, that refund can be sizable. Someone in a 12% effective bracket who had 22% withheld from every commission check has been overpaying by about 10 percentage points on that income all year. Filing is what corrects the overshoot.

If your total wages passed $200,000, check the Additional Medicare Tax figure too. Your employer applies the extra 0.9% based only on your individual wages crossing $200,000, but the real threshold depends on filing status: $250,000 for married filing jointly, $125,000 for married filing separately.³ Reconcile it on Form 8959 with your return.⁹

If You Get Commissions on a 1099

Everything above applies to W-2 employees. If you earn commissions as an independent contractor (common for real estate agents, insurance brokers, and freelance sales reps), none of the withholding rules apply. Payers who send you $2,000 or more in commissions during 2026 report the payments on Form 1099-NEC, and you receive the gross amount with nothing taken out.¹⁰

The trade-off is that you owe self-employment tax of 15.3% (12.4% Social Security and 2.9% Medicare) on your net earnings, because you’re paying both the employee and employer sides of FICA. The Social Security portion runs up to the same $184,500 wage base for 2026. You can deduct half of the self-employment tax when calculating adjusted gross income, but the total cost per dollar earned is still higher than what a W-2 employee pays.¹¹⁴ Because nothing is withheld at the source, contractors have to make quarterly estimated tax payments to cover both income tax and self-employment tax.¹²

1
Internal Revenue Service. Publication 15 (2026), (Circular E), Employer’s Tax Guide
2
GovInfo. Treasury Regulation 31.3402(g)-1 – Supplemental Wage Payments
3
Office of the Law Revision Counsel. 26 USC 3101 – Rate of Tax
4
Social Security Administration. Contribution and Benefit Base
5
Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
6
Internal Revenue Service. Tax Withholding Estimator
7
IRS. Form W-4 (2026) Employee’s Withholding Certificate
8
Internal Revenue Service. About Form 1040, U.S. Individual Income Tax Return
9
Internal Revenue Service. About Form 8959, Additional Medicare Tax
10
Internal Revenue Service. Form 1099 NEC and Independent Contractors
11
Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
12
Internal Revenue Service. Estimated Tax