How BAH Is Calculated (and Why It Changes by Duty Station)

Basic Allowance for Housing is set by three things: your pay grade, your dependency status (with or without dependents), and the Military Housing Area (MHA) your duty station falls in. The same E-5 with dependents gets a different BAH figure at a high-cost-of-living installation than at a low-cost one, because the MHA rate is built from local rental market data for that specific area, not a national average.

That's why BAH is never a single national number — it's a lookup table with a separate rate for every pay grade, dependency status, and MHA combination, refreshed annually.

MHA boundaries don't always match city or county lines, and two neighborhoods that feel similar can technically sit in different MHAs with different rates. This is part of why the same-sounding duty station question — 'what's BAH at Fort X' — doesn't have one universal answer; it depends on the specific MHA your assignment is coded to, which your finance office can confirm precisely.

A planning estimate is genuinely useful before you have official numbers — it's the difference between house-hunting with a real budget range and guessing. The BAH Calculator gives that estimate by pay grade and installation. But before signing a lease or making an offer, always confirm your exact, current rate with your finance office — published estimates and calculators are for planning, not entitlement determination.