How Are Bonuses Taxed?

Why Your Bonus Check Looks Smaller Than Expected

Every year around bonus season, some version of the same conversation happens. Someone opens their pay stub, sees a large chunk of their bonus missing before it ever hits their bank account, and assumes the IRS has it out for bonuses specifically. It is an understandable reaction. A number that big disappearing in one line item feels like it deserves an explanation.

Here is the explanation: what came out of that check was withholding, not your final tax bill. Withholding is the amount your employer sends to the IRS on your behalf as an estimate of what you will owe. It is calculated using a simplified formula that has nothing to do with your actual tax bracket, your deductions, or anything else about your specific return. For bonuses, that formula is usually a flat rate, and it can be higher or lower than what you actually owe once your whole year of income is added up.

That gap between withholding and liability is the whole story here, and it matters most for high earners, because the flat rate used on most bonuses is lower than the top tax brackets those earners fall into.

How Bonus Withholding Actually Works

The IRS does not tax bonuses under a separate set of tax brackets. There is no "bonus tax rate" written into the tax code. What does exist is a category called supplemental wages, which covers bonuses along with commissions, overtime, severance pay, and certain other payments that are not your regular hourly or salary wages, according to IRS Publication 15 (irs.gov/publications/p15).

Because supplemental wages are paid separately from a regular paycheck, employers are allowed to withhold federal income tax from them using one of two methods:

If your total supplemental wages for the year exceed $1 million, the withholding rate on the amount above $1 million jumps to a mandatory 37%. That higher rate only applies to the excess over $1 million, not retroactively to the first $1 million.

For most people receiving a typical year-end or performance bonus, the percentage method is what shows up on the pay stub. Say you receive a $10,000 bonus. Under the flat rate, your employer withholds $2,200 for federal income tax (22% of $10,000), before any additional withholding for Social Security, Medicare, or state tax. That $2,200 is not necessarily what you will owe on that $10,000 when you file your return; it is simply what got sent to the IRS in advance.

The flat rate exists mostly for the employer's convenience. Payroll systems are not built to know your household's full tax picture, your filing status, your deductions, or what else you have earned so far in the year. Rather than trying to guess your marginal bracket, the IRS lets employers apply one simple percentage to supplemental wages and move on. That simplicity is exactly why the number on your bonus check can end up disconnected from the number on your tax return.

Bonuses are also subject to the same payroll taxes as your regular wages: Social Security tax at 6.2%, up to the 2026 wage base of $184,500, and Medicare tax at 1.45%, which has no wage cap. If your combined wages for the year exceed $200,000 (or $250,000 for married couples filing jointly), an Additional Medicare Tax of 0.9% applies on top of the standard 1.45%. These payroll taxes are separate from income tax withholding and follow their own rules regardless of how the bonus itself is classified.

• 01The percentage method: a flat 22% federal withholding rate applies to the first $1 million of supplemental wages an employee receives in a calendar year. This is the method most employers use for a bonus paid on its own check.
• 02The aggregate method: the bonus is combined with a regular paycheck and withholding is calculated on the total using the regular wage withholding tables. This method is less common for standalone bonus checks but is sometimes used when a bonus is paid alongside normal pay.

Withholding Is Not Your Final Tax Bill

Here is the part that trips people up. When you file your tax return the following April, your salary and your bonus are not treated as separate buckets taxed at separate rates. They are combined into your total taxable income for the year and taxed together at your marginal tax rate, the rate that applies to your top slice of income based on your tax bracket.

That means the 22% withheld from your bonus check was never meant to be your final answer. It was a placeholder. What happens next depends entirely on where your marginal rate lands relative to that 22%.

If your marginal tax rate is below 22%, you likely had more withheld from your bonus than you actually owed. That extra amount rolls into your overall tax picture for the year and generally shows up as part of a larger refund, or a smaller balance due, when you file.

If your marginal tax rate is above 22%, the opposite happens. This is the scenario that catches high earners off guard. If you are in the 32% or 37% federal tax bracket but your bonus was only withheld at the flat 22% rate, you are under-withheld on that income by roughly 10 to 15 percentage points. On a $50,000 bonus, a 10-point gap works out to about $5,000 of additional tax that was never set aside. Multiply that across a few bonuses, a large commission check, or a year with significant equity compensation vesting, and the shortfall can add up to a genuine surprise at tax time, potentially along with an underpayment penalty if the shortfall is large enough relative to what you owed the prior year.

The bonus itself is not being taxed unfairly. It is being taxed the same way as every other dollar of ordinary income you earn. The mismatch is purely about timing: how much got withheld along the way versus how much is actually due once everything is added together.

What High Earners Should Do About the Gap

None of this means you should dread your next bonus. It means the size of the check you see today is not the number that should drive your tax expectations. A few practical steps may help close the gap before it becomes a problem.

Run a tax projection before the bonus arrives, or as soon as possible after. Adding your expected bonus to your salary and other income for the year gives you a rough sense of your marginal rate and whether the flat 22% withholding is likely to cover what you will actually owe. This is a calculation your CPA or financial advisor can walk through with you, and it is far more useful done in the months before filing season than in April when options are limited.

If the projection shows a meaningful shortfall, you may be able to make an estimated tax payment to the IRS during the year to close some or all of the gap, which could help you avoid an underpayment penalty. Whether you need to make a payment, and how much, depends on factors including your prior year's tax liability and your income throughout the current year, so this is a conversation worth having with your CPA or tax professional rather than a do-it-yourself estimate.

If you live in Florida, there is one piece of good news: Florida has no state income tax, so there is no state withholding taken from your bonus and no state-level version of this gap to plan around. Your entire under-withholding concern with a Florida bonus check is at the federal level, which simplifies the math somewhat, even though the federal gap itself still needs attention.

This issue tends to be most relevant for a specific group of people: sales professionals whose commissions can swing significantly from year to year, and equity compensation recipients whose RSU vesting events or bonus payouts can push a single paycheck into unusually high territory. If a big vesting event and a bonus land in the same pay period, the combined supplemental wage withholding may fall well short of your actual marginal rate, so it is worth reviewing both together rather than assuming a bonus is the only piece in play.

A few habits may help keep this from becoming an annual surprise: check your year-to-date withholding after any large bonus or commission check, rather than waiting until you file; ask your CPA whether adjusting your regular paycheck withholding (through your W-4) for the rest of the year could help offset an under-withheld bonus, instead of relying solely on estimated payments; and revisit the projection again if you receive more than one bonus, commission payout, or vesting event in the same calendar year, since each one adds to the same marginal-rate math.

This article is for educational purposes only and should not be considered specific tax advice. Consult your CPA or tax professional for guidance on your individual situation.

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If you are trying to figure out whether your bonus withholding lines up with what you will actually owe, a coordinated look at your income, withholding, and estimated payments for the year may help you avoid an unpleasant surprise in April. Hunt Wealth Planning is a fee-only fiduciary firm based in Tampa, Florida, with no account minimums, working with professionals who are still building wealth.

Schedule your free intro call to talk through your bonus, your withholding, and whether an estimated payment might make sense for your situation.