Why Your Overtime Check Looks Smaller Than You Expected

If you have ever picked up a string of extra shifts and then looked at the deposit with a frown, you are not alone. The check is bigger than a normal one, but somehow not as much bigger as the hours suggested. It is one of the most common questions we hear from firefighters, law enforcement officers, and medics: why is my overtime taxed so much?

The short answer is that your overtime is probably not taxed as much as it looks. What you are usually seeing is a withholding effect, not a higher tax rate. And starting with the 2025 tax year, there is a new federal deduction that can lower the tax on some of that overtime for the first time. Here is how both pieces work, in plain terms.

Overtime is not taxed at a higher rate

There is no separate, higher tax bracket that applies just because income came from overtime. A dollar of overtime is taxed the same as a dollar of regular pay. The reason a big overtime check can feel like it gets hit harder comes down to how payroll systems calculate withholding.

Most payroll software estimates your tax for the year by looking at a single paycheck and assuming every check will be that size. When you work a heavy overtime period, that one check is much larger than usual, so the software briefly behaves as if you will earn at that elevated pace all year. It withholds at a higher rate to match that assumption. The next normal-sized check goes back to normal withholding.

The practical result is that more tax may be held back from a big overtime check than you will actually owe on it. That difference is not lost. It gets reconciled when you file your return, which is part of why heavy-overtime years often produce a refund. The money was yours the whole time; it just sat with the government a few months longer than it needed to. This single-check estimating quirk is also a big reason why budget calculators get your paycheck wrong when your pay swings from week to week.

If you would rather keep more of it in each check instead of waiting for a refund, you can adjust your Form W-4 with your employer. The IRS Tax Withholding Estimator is a free tool that helps you set that up based on your expected pay.

What actually comes out of an overtime check

It helps to separate the two things leaving your paycheck:

• Federal income tax withholding, which is the part that fluctuates with check size and gets trued up at filing.
• Payroll taxes for Social Security and Medicare, which are a flat percentage and apply to overtime the same as regular pay.

State and local taxes, where they apply, follow their own rules. The point worth remembering is that the large, surprising number on a heavy check is almost always the federal withholding piece, and that piece is an estimate, not a final bill.

The new overtime deduction, explained

Beginning with the 2025 tax year, there is a federal deduction for certain overtime pay. It was created by the 2025 tax law often referred to as the One Big Beautiful Bill Act, and the IRS has published guidance on how it works. A few details matter, especially for first responders.

It covers the premium portion only. The deduction applies to qualified overtime under the Fair Labor Standards Act, and specifically to the extra "half" of time-and-a-half pay. If your regular rate is twenty dollars an hour and your overtime rate is thirty, the deductible amount is the ten-dollar premium per overtime hour, not the full thirty. This is the detail most people miss when they hear "no tax on overtime."

There are annual caps. The maximum deduction is 12,500 dollars, or 25,000 dollars for a married couple filing jointly.

It phases out at higher incomes. The deduction begins to shrink once modified adjusted gross income passes 150,000 dollars for a single filer, or 300,000 dollars for joint filers, and is reduced as income rises above those lines.

It is a deduction, not a full exemption. It reduces the federal income tax you owe on the qualifying overtime. It does not remove Social Security or Medicare taxes, and it does not change state tax. The current provision applies to tax years 2025 through 2028.

What this means for firefighters specifically

Firefighters are a special case, and it is worth being precise. Fire protection employees are usually covered by Section 207(k) of the Fair Labor Standards Act, which sets overtime on a work period rather than a standard 40-hour week. Depending on the length of the adopted work period, overtime is not triggered until you pass a set number of hours. For a 7-day work period, that threshold is 53 hours.

That distinction matters because the new deduction is tied to FLSA-qualifying overtime. Hours you might think of as overtime, such as certain shift trades or some forms of contractual overtime, may not all count as FLSA overtime for the deduction. Beginning in 2026, employers are required to report qualifying overtime separately on your W-2, which will make it easier to see the amount that actually qualifies. For 2025, that reporting was handled under transition rules.

The honest takeaway is that the number that qualifies for the deduction may be smaller than your total overtime, and it is worth confirming the figure rather than estimating it. Our overtime calculator walks through a 53-hour work period and shows what your overtime is actually worth after withholding.

A simple way to think about it

Two things are true at once. Your overtime is not taxed at a punitive rate, and a meaningful slice of it may now qualify for a real deduction. The confusion usually comes from looking at withholding on a single big check and assuming that is the final tax. It rarely is. When you are ready to move past one paycheck, you can build your full plan and see how a heavy-overtime year fits your whole budget.

If you want to see how overtime, your pension, and your take-home pay actually fit together over a year, it helps to put real numbers on it instead of guessing from one paycheck. You can run your own numbers and see the full picture rather than the snapshot.

This article is general information, not tax advice. Overtime rules vary by department, work period, and state, and your situation may differ. For decisions about your own taxes, check your pay records and consult a qualified tax professional.

Sources

• Internal Revenue Service, "What to know about the No Tax on Overtime deduction," irs.gov.
• Internal Revenue Service, "One, Big, Beautiful Bill Act: Tax deductions for working Americans and seniors," irs.gov.
• U.S. Department of Labor, Fair Labor Standards Act Section 207(k) work-period provisions for fire protection and law enforcement (29 U.S.C. 207(k)), dol.gov.