Drill vs AT vs ADOS Pay Calculator

The 30-day seam nobody publishes

Two different rules both key on “30 days,” and they do not agree. That mismatch is the single most consequential thing about accepting a set of orders, and no official calculator surfaces it.

Run 29, 30 and 31 days through the calculator above and you get three different answers:

• 29 days — paid 1/30 of monthly basic pay per day including the 31st of a calendar month; BAH RC/T.
• 30 days — the 30-day-month convention applies, so no pay accrues for the 31st of a calendar month; and it is still BAH RC/T, because locality BAH needs more than 30 days. This is the worst of both rules.
• 31 days — locality BAH at your home ZIP, plus FSA eligibility and leave accrual.

If your orders are being written for 30 days and the mission would tolerate 31, that one day is worth asking about.

The exception most explainers miss

A short order — 30 days or fewer — that is issued in support of a contingency operation draws the full locality rate, not RC/T. That is 37 U.S.C. § 403(g)(4)(B), and § 403(g)(5) explicitly carves contingency-support orders out of the reduced rate. Check the authority line on your orders.

Government quarters override everything

If you are assigned government quarters that are appropriate to your grade and adequate for you and your dependents, no housing allowance is payable at all (37 U.S.C. § 403(e)(1)). A member without dependents then receives Partial BAH instead — a token amount, $12.00 a month for an E-7 in 2026. Two things soften this:

• The statutory denial requires quarters adequate for the member and dependents. Barracks are single-type quarters and are not adequate for dependents, so a member with dependents billeted in barracks keeps the housing allowance.
• A member without dependents in a grade above E-6 may elect not to occupy assigned quarters and take BAH instead (§ 403(e)(2)), unless the Secretary denies the election because it would harm a training mission, discipline, or readiness (§ 403(e)(4)).

Why the points column is the real answer

A drill period earns one retirement point. A day of active duty earns one retirement point. On their face they look identical — and that is exactly why the comparison gets made wrong.

The difference is the cap. The annual inactive-point cap applies to IDT points and membership points. It does not apply to active duty points. So four drill periods and four ADOS days both put four points on your statement, but only the drill points spend a limited resource.

If you are already near the annual inactive cap for the retirement year, additional drill periods add pay without adding points that count toward your pension. ADOS and AT days keep counting all the way to 365. Anyone weighing extra drills against a set of orders should be looking at where they sit against that cap first.

Convert your career point total into a pension estimate →

Drill pay carries no housing, and BAS only barely

No BAH on drill. Inactive Duty Training carries no housing allowance under any circumstances. BAH is conditioned on entitlement to basic pay (37 U.S.C. § 403(a)(1)), and a member performing IDT is by statutory definition not entitled to basic pay — IDT is compensated separately under 37 U.S.C. § 206. The allowances section of FMR Vol 7A Chapter 58 lists clothing, officers' uniform allowance and BAS. Housing is simply absent.

BAS on drill is not the BAS entitlement. There is one narrow provision (Ch 58 ¶5.3): enlisted members may receive subsistence in kind or a cash commutation for meals when their duty totals at least 8 hours in one day, at the Service Secretary's discretion, paid at 1/30 of the monthly BAS rate and prorated by meal — 20% breakfast, 40% lunch, 40% dinner. It is discretionary, enlisted-only, and in practice most drilling members are fed in kind or receive nothing. This calculator reports $0 rather than modeling a payment that depends on written Service instructions it cannot see.

The moment you go on active duty orders, both flip on: BAS is payable with no order-length threshold, and some form of housing allowance applies.

Title 10 vs Title 32 does not change your pay

Basic pay, BAS and BAH are identical under both authorities. Chapter 57 of the FMR governs reserve entitlements for active duty without reference to the funding title, and the BAH provisions at 37 U.S.C. § 403(g) key on order length and contingency support — the words “Title 10” and “Title 32” do not appear.

You will find sources stating that Title 32 orders pay a non-locality BAH while Title 10 orders pay locality BAH. That is incorrect. A Title 32 order of 45 days pays locality BAH; a Title 10 order of 20 days pays RC/T. It is the length, not the title.

Where the title genuinely matters is downstream, and it matters a lot:

• Reduced retirement-pay age — Title 10 active duty counts toward the 90-day/3-month reduction. Title 32 § 502(f) duty counts only when performed in support of a national emergency or federal mission (10 U.S.C. § 12731(f)).
• Post-9/11 GI Bill — qualifying service is broad under Title 10. Title 32 § 502(f) ADOS qualifies only for specific enumerated operations.

So the pay comparison above holds either way. Read the authority line on your orders for the benefits question, not the pay question.