TL;DR
- ✅ Same W-4 as everyone else; withholding is figured on taxable pay
- ✅ BAH, BAS and combat zone pay are excluded, so withholding is lower than your total pay suggests
- ✅ A working spouse or a civilian job on top of drilling pay means Step 2
- ✅ Your state of legal residence, not where you are stationed, taxes your military pay
What is taxable
| Pay | Federal income tax |
|---|---|
| Basic pay, bonuses, special pay | Taxable |
| BAH and BAS (housing and subsistence allowances) | Not taxable |
| Combat zone pay | Excluded (enlisted and warrant officers in full; officers up to a monthly cap) |
| TSP traditional contributions | Pre-tax: lowers taxable pay |
All three exclusions are applied by your pay office before withholding, so the W-4 only needs to describe your tax situation, not subtract them yourself. Enter your taxable pay in the calculator below to match what is withheld.
Calculate your military W-4 — free
Enter your taxable pay per period and your situation to see what to write on each line.
Open the W-4 Calculator →What changes when you have a spouse or second job
- Working spouse: complete Step 2 on both W-4s. See W-4 for couples who both work.
- Reservist or Guard with a civilian job: drill pay and your civilian pay are two jobs. See W-4 with two jobs.
- Spouse moves with you: a PCS move means a new state each time, and your spouse’s state form may change. See W-4 when you move to a new state.
State tax rules for service members and spouses
Under federal law, a service member’s military pay is taxed only by their state of legal residence, no matter where they are stationed, and a military spouse can often keep that same state for tax purposes. States then provide a way to tell the employer. Kentucky’s K-4 has a nonresident military spouse exemption and an exemption for non-resident Fort Campbell workers, the South Carolina SC W-4 lets a servicemember or spouse elect a different state of domicile, and Hawaii’s HW-4 instructions cover nonresident military spouses. See your state’s page under state withholding calculators for its form.
⚠️ Check your W-2 after a deployment
Box 1 of your W-2 should already exclude combat zone pay. If it does not, ask your finance office for a corrected W-2. A mid-year change in deployment or marital status is also a reason to review your W-4; see how often you can change your W-4.
General form help is in the complete W-4 guide. When you leave the service, see the new job W-4 guide and W-4 after a layoff if there is a gap before your next job.
Frequently asked questions
Do military members fill out a W-4?
Yes. Service members use the same Form W-4 for federal income tax withholding from military pay, which you update through your finance office or pay system. The rules for filling it out are the same as for any employee.
Is BAH taxable?
No. Basic Allowance for Housing and Basic Allowance for Subsistence are excluded from income, so your withholding is figured on taxable pay such as basic pay, not on your total compensation.
How does the combat zone exclusion affect withholding?
Pay for any month you serve in a combat zone or qualified hazardous duty area is excluded from income for enlisted members and warrant officers, and for commissioned officers up to a monthly cap. Your W-2 box 1 should already exclude it. You do not need to change your W-4 for it.
My spouse also works. What changes on the W-4?
You each have an income, so complete Step 2 on both W-4s. See the guide for couples who both work. A military spouse may also be exempt from state tax in the state where they work; see below.
Which state taxes my military pay?
Generally only your state of legal residence, not the state where you are stationed, under the Servicemembers Civil Relief Act. A military spouse can often keep the same legal state. Each state has its own form or exemption box, for example the Kentucky K-4, the South Carolina SC W-4 and the Hawaii HW-4.
Key terms in this article
Related guides
W-4 for Married Couples 2026: How to Fill It Out When Both Spouses Work
Two incomes, two W-4s. Filing status, the Step 2 choice, and which spouse claims the kids, so you do not owe in April.
W-4 When You Move to a New State: What to Change (2026)
Your federal W-4 stays the same, but state withholding does not. Which forms to file and what to do if you live and work in different states.
How to Fill Out a W-4 With Two Jobs (2026 Guide)
Two jobs means two withholding calculations — and a likely tax bill in April if you ignore Step 2. Here's exactly how to fill it out and avoid the shortfall.
How to Fill Out a W-4 for a New Job (2026 Step-by-Step)
Starting a new job and staring at a blank W-4? This guide walks you through all 5 steps — including what to do if you have a second job or your spouse works.
Run the numbers
Ready to file your taxes?
From $0 · Best for: Complex returns
Start filing →Free + $15 state · Best for: Simple returns
Start filing →W4Calc may receive compensation when you click links to tax software partners. This does not affect our recommendations.