What BAH Is and Why It Matters
Basic Allowance for Housing (BAH) is a tax-free allowance the Department of Defense pays to offset the cost of housing when a service member isn't living in government quarters. It is the second-largest component of most service members' pay after base pay, and because it's tax-free, every dollar of BAH is worth meaningfully more than a dollar of taxable salary.
Three things determine your rate: your duty-station Military Housing Area, your paygrade, and whether you have dependents. That's it — BAH does not change based on your actual rent or mortgage. If your housing costs less than your BAH, you keep the difference. If it costs more, you cover the rest. This structure is what makes BAH the cornerstone of military house-hacking and buy-versus-rent decisions.
Military Housing Areas: Why There's No ZIP Box
BAH is set by Military Housing Area (MHA), not by ZIP code. An MHA is a geographic zone — usually a metro area around one or more installations — that DoD treats as a single rental market. Many ZIP codes roll up into one MHA, and DoD publishes a single rate per MHA for each paygrade and dependency tier.
That's why this calculator asks for your installation rather than a ZIP code: selecting your base resolves the correct MHA directly, which is exactly how DFAS assigns your rate. The calculator covers 337 Military Housing Areas across the CONUS, Alaska, and Hawaii. (Overseas duty stations use a different allowance — see below.)
With Dependents vs. Without Dependents
Every MHA publishes two rates per paygrade: a higher with-dependents rate and a lower without-dependents rate. One important nuance: the with-dependents rate is flat regardless of how many dependents you have. A service member with one child and a service member with four children at the same paygrade and MHA draw the identical with-dependents BAH.
The calculator shows both tiers side by side so you can see the difference, but your actual entitlement is the tier matching the dependency status on file with your finance office. Dual-military couples and shared-custody situations have specific rules — that's a good question for Ask the Military Expert.
When BAH Rates Change
New BAH rates take effect January 1 every year. DoD publishes them in mid-December, based on rental-market data collected over the prior year. Rates can rise or fall with the local market — a hot rental market pushes an MHA's rate up; a cooling one can push it down.
The protection against a falling rate is individual rate protection: as long as your status stays the same (same paygrade, dependency status, and duty station), your BAH will never drop below what you were already receiving, even if the published rate for your MHA goes down. The moment you change status — promote, gain or lose a dependent, or PCS — you move to the current published rate, up or down.
BAH Is Tax-Free — and That's a Big Deal
BAH is excluded from gross income for federal tax purposes and is untaxed in nearly every state. Practically, that means a service member receiving, say, $2,000/month of BAH is getting the equivalent of meaningfully more than $2,000 of taxable civilian salary — because the civilian would owe federal and (usually) state income tax on that money first.
This tax advantage is the reason a civilian salary often has to be substantially higher than a military total-compensation figure to actually come out ahead. If you're weighing a civilian offer, the Military Salary Calculator accounts for the tax-free value of BAH and BAS line by line.
What About Overseas? OHA, Not BAH
Service members at overseas (OCONUS foreign) duty stations receive Overseas Housing Allowance (OHA), not BAH. OHA works differently: it's reimbursement-based against your actual lease, up to a cap, and is administered through DTMO. This calculator covers BAH only.
Note that Alaska and Hawaii are part of the BAH system, not OHA — so those installations have published BAH rates and the calculator returns them normally. Only foreign duty stations fall under OHA.
How This Calculator Works
The figures come straight from the official DFAS BAH rate table — the same data DFAS uses to set your pay. When you select an installation, the calculator maps it to its Military Housing Area, then reads the published rate for your paygrade at both dependency tiers. The provenance control on the result shows the exact MHA and the rate's effective date so you can verify it.
We never estimate or interpolate a BAH figure. If a base or paygrade isn't in the published table, the calculator says so and points you to the official DFAS BAH lookup rather than showing a guess. The rates shown are the current 2026 set; for the official source, see the DoD BAH page.
Related Garrison Ledger Tools
BAH touches almost every military-money decision. A few related tools:
- House Hacking Calculator — Use your BAH as the cornerstone of a 2-4 unit VA-loan purchase and model the cash flow.
- Military Salary Calculator — See how the tax-free value of BAH stacks against a civilian salary offer.
- PCS Budget Planner — A PCS usually changes your BAH; plan the move and the new housing budget together.
- Ask the Military Expert — Cited answers on rate protection, dual-military BAH, proration, and the edge cases a rate table can't cover.
Sources
DoD / DTMO — Basic Allowance for Housing · Official BAH rate lookup · DTMO Overseas Housing Allowance (OHA) · DFAS BAH overview