What your enlistment or reenlistment bonus actually pays you
The 22% is withholding, not tax. The IRS treats a bonus as supplemental wages, so DFAS withholds a flat 22% for federal income tax no matter what bracket you are in. That is a payroll convenience, not your tax rate. Your actual tax on the bonus is settled on your return at your real marginal rate. If your top bracket is 12%, you were over-withheld and you get the difference back as a refund. If the bonus pushes you into 24%, you may owe more at filing. This single misunderstanding is why every bonus feels like a robbery and every spring feels like a windfall.
FICA is the part you never get back. Social Security takes 6.2% and Medicare takes 1.45%, so 7.65% comes off the top and it is not refundable. Social Security stops once your wages for the year reach the Social Security wage base of $184,500. Medicare has no ceiling at all, and a small extra Medicare tax applies once your wages pass the threshold for your filing status.
Installments are a tax feature, not just a cash-flow annoyance. When a bonus is paid over several years, no single year absorbs the whole amount, which can keep you out of a higher bracket. Under DoD FMR Volume 7A Chapter 9, a bonus is paid as a lump sum or in installments at the Service Secretary's discretion, and when installments are used, no less than half arrives up front with the rest in equal annual payments. Splits vary by service and by bonus type. Get yours in writing before you sign.
The combat zone erases the federal tax entirely. If your contract effective date lands in a calendar month during which you spent even one qualifying day in a designated combat zone, the whole bonus is excluded from federal income tax. On a $40,000 bonus in the 22% bracket, that is $8,800 for choosing where to sign a piece of paper. FICA still comes out, and commissioned officers remain bound by the monthly exclusion cap of $11,391.90. The full picture is in the Deployment Money Playbook.
A bonus is an advance, not a gift. Under 37 U.S.C. 373, if you do not complete the service the bonus paid for, you repay the unearned portion and DFAS opens a debt against you. Waivers exist for things outside your control. Nothing about the money is truly yours until the obligation is served.
A flat 22% federal withholding plus 7.65% FICA, plus state tax if your state of legal residence charges it. On a $40,000 bonus with no state income tax, that is $8,800 federal and $3,060 FICA, leaving $28,140 in hand on payday.
No, and this is the most important thing on this page. The 22% is a withholding rate set by IRS Publication 15 for supplemental wages. Your bonus is taxed as ordinary income at your real marginal rate. In the 12% bracket you are over-withheld and get a refund. There is no special bonus tax rate.
The mandatory 37% withholding applies only to supplemental wages above one million dollars from a single employer in one calendar year. No military bonus comes close, so it never applies to you. This calculator does not model it for that reason.
Your service decides, not you. If installments are used, at least 50% arrives up front and the rest comes in equal annual payments. Installments spread the income across tax years, which can keep you in a lower bracket. Lump sums give you the cash immediately, which matters more if you carry high-interest debt.
Yes. Incentive, special, and bonus pay have their own TSP election in MyPay, separate from basic pay. Traditional contributions are pre-tax and reduce your withholding; Roth contributions do not. The yearly TSP maximum still applies. Bonus money moved into Roth TSP during a combat-zone month is never taxed at any point. Project the growth with our TSP Calculator.
Generally yes. Under 37 U.S.C. 373 you repay the unearned portion, and DFAS establishes a debt. Waivers exist for death, injury, illness, and other circumstances beyond your control. Do not spend a bonus as if the obligation is already behind you.
All data on this page comes from official government sources. Verify independently:
📎 IRS Publication 15, Section 7 (Supplemental Wages)📎 IRS Topic 751 (Social Security & Medicare Rates)📎 SSA Contribution and Benefit Base📎 DoD FMR Vol 7A Ch 9 (Bonuses)📎 Combat Zone Tax Exclusion (IRS)📍 This is an estimate. For official numbers, use your installation's free resources:
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