Every December and March, the same question floods personal finance forums: why was my bonus taxed at 40%? It is one of the most common tax complaints in the United States, and it is almost always based on a misunderstanding. Your bonus is not taxed at 40%. In most cases, it is not even taxed at a higher rate than your regular income. What is happening is a withholding issue, not a tax rate issue, and the distinction matters enormously for your financial planning.
When your employer pays you a bonus, federal law requires them to withhold taxes. For supplemental wages (which include bonuses, commissions, and severance), the IRS allows two methods of withholding. The most common is the flat rate method: your employer withholds a flat 22% for federal income tax on bonuses up to $1 million. Above $1 million, the rate jumps to 37%. This flat 22% is just the federal income tax withholding — it does not include FICA or state taxes.
Here is why the total withholding looks so brutal. Take a $10,000 bonus. Federal income tax withholding: $2,200 (22% flat rate). Social Security tax: $620 (6.2%). Medicare tax: $145 (1.45%). If you live in California, add another $1,000 or so in state withholding. In New York City, add state ($600) plus city ($380) taxes. Total withholding on a $10,000 bonus in NYC: approximately $3,945, or 39.5%. In California: approximately $3,965, or 39.7%. It looks like nearly 40% of your bonus vanished — and technically it did from your paycheck — but this is withholding, not your actual tax rate.
The second withholding method is the aggregate method, and it can make things look even worse. Under this method, your employer combines your bonus with your regular pay for that pay period, calculates the income tax on the total as if you earned that much every pay period, then subtracts the tax already withheld on your regular pay. The difference is withheld from the bonus. If your regular biweekly pay is $3,000 and your bonus is $10,000, the employer calculates withholding as if you earn $13,000 every two weeks ($338,000 annualized), pushing the projected income into higher brackets. This can result in withholding that exceeds 30% on the bonus portion alone at the federal level.
Here is the critical point that many people miss: withholding is not your actual tax rate. When you file your tax return, all income from the year — salary plus bonus — is combined, and your actual tax is calculated on the total. If the combined withholding from your paychecks and bonus exceeds your actual liability, you get a refund. If it falls short, you owe the difference. The bonus itself is not taxed at a special rate. It is ordinary income, taxed at your marginal rate just like every other dollar you earn.
Let us walk through what actually happens at different income levels. If your regular salary is $75,000 and you receive a $10,000 bonus, your total income is $85,000. After the standard deduction of $16,100, taxable income is $68,900. You are solidly in the 22% federal bracket. Your marginal rate on the bonus is 22% — exactly matching the flat withholding rate. In this scenario, the withholding is almost perfectly calibrated and you will neither owe extra nor receive a significant refund attributable to the bonus.
At a $100,000 salary with a $25,000 bonus, total income is $125,000 and taxable income is $108,900. This pushes some income into the 24% bracket (which starts at $106,450 for single filers in 2026). About $2,450 of the bonus is taxed at 24% while the rest falls in the 22% bracket. The flat 22% withholding on the entire $25,000 bonus is therefore slightly under what you actually owe — by roughly $49. This minor underpayment is easily covered by other withholding adjustments, but it illustrates that the flat rate method becomes less accurate as income rises.
The math changes significantly for higher earners. At a $200,000 salary with a $50,000 bonus, total income is $250,000 and taxable income is $233,900. A substantial portion of this income falls in the 32% bracket (which starts at $203,300 for single filers). The flat 22% withholding on the $50,000 bonus withholds only $11,000, but the actual marginal tax on much of that bonus is 32%, meaning the real liability on the bonus is closer to $15,000 to $16,000. In this case, the 22% flat rate significantly underwithholds, and you may owe $4,000 to $5,000 at tax time. Higher earners should plan for this shortfall rather than being surprised in April.
State taxes stack on top of federal withholding and can push the total effective rate substantially higher. California adds up to 13.3% on high earners. New York imposes up to 10.9% at the state level, and New York City adds another 3.876%. Oregon charges up to 9.9%. A high earner in California receiving a $50,000 bonus can face a combined marginal rate of 32% (federal) plus 1.45% (Medicare) plus 11.3% (California effective on that income) equals 44.75% — and that is the actual rate, not just withholding. For high-income earners in high-tax states, the 40% complaint is not entirely wrong in terms of actual tax, even though the withholding mechanics are different from what they think.
The Additional Medicare Tax adds another wrinkle. Earnings above $200,000 (single) or $250,000 (married filing jointly) face an additional 0.9% Medicare surtax. If your salary is $190,000 and you receive a $30,000 bonus, the last $20,000 is subject to the additional Medicare tax. Your employer may not withhold this on the bonus, leaving you to pay it when you file. At $220,000 in total earnings, the additional Medicare tax adds $180 (0.9% of the $20,000 over the threshold) — modest, but another reason your tax bill at filing can differ from withholding.
There are practical strategies to reduce the tax impact of a bonus. The most effective is increasing your 401(k) contribution for the pay period that includes the bonus. If you can direct all or most of the bonus into your 401(k) (up to the annual limit of $24,500), you defer both federal and state income tax on that amount. A $15,000 bonus directed into a 401(k) saves $3,300 in federal tax at the 22% rate plus state savings — and the money grows tax-deferred in your retirement account rather than going to the IRS.
Timing bonuses across tax years can also help if your employer is flexible. If you are close to a bracket boundary, receiving a bonus in January rather than December (or vice versa) might keep more income in a lower bracket. This strategy is most effective when your income is near the 22% to 24% threshold ($106,450) or the 24% to 32% threshold ($203,300), where the bracket jump is significant. Talk to your employer about whether bonus timing can be adjusted.
Adjusting your W-4 withholding after receiving a large bonus can prevent overwithholding on your remaining paychecks. If you received a $20,000 bonus in March and know that the 22% flat rate was close to your actual rate, no adjustment is needed. But if you are in a lower bracket and the bonus was overwithheld, you can submit a new W-4 to reduce withholding on the remaining paychecks and get the money throughout the year rather than waiting for a tax refund.
The bottom line is simple: withholding is not the same as your actual tax rate. The flat 22% federal withholding on bonuses is a convenience method that works reasonably well for earners in the 22% bracket, underwithholds for high earners, and overwithholds for low earners. Your actual tax on a bonus is determined by your marginal bracket, which depends on your total income for the year. If you want to know exactly what you will keep from your next bonus, use our bonus tax calculator, check your overall paycheck withholding, or try the W-4 calculator to optimize your withholding for the rest of the year.