Prorated BAH Calculator

Basic Allowance for Housing (BAH) is paid at a daily equivalent rate (1/30 of the monthly rate). When a service member executes a PCS mid-month, the Defense Joint Military Pay System (DJMS) splits BAH between the losing-duty-station rate and the gaining-duty-station rate based on the day the member signs out and reports in — not on pay-period boundaries.

BAH entitlement at the losing duty station continues through the day before the effective date of PCS status change; the gaining-station rate begins on the effective date per the DoD Financial Management Regulation.

Per the DFAS DJMS Advisory Schedules, each pay cycle has a cutoff after which transactions roll to the next payday. Mid-month pay covers the 1st–15th and typically has a cutoff on the first Thursday or Friday of the month; end-of-month pay covers the 16th through month-end with a cutoff around the 22nd–24th.

If your PCS transaction is entered in DJMS after the cutoff, the prorated BAH change will appear on the following LES rather than the current one — which is why many members see the BAH split land one pay cycle after arrival.

When the losing or gaining duty station is OCONUS, the calculation uses Overseas Housing Allowance (OHA) in place of BAH for that leg. OHA reimburses actual rent up to a location- and rank-specific ceiling, plus a flat Utility/Recurring Maintenance Allowance; members moving between OHA and BAH locations should expect both a pro-rated allowance and a transition through BAH Transit.