Military Spousal Support Calculator: Branch Formulas and BAH Rules

When a military couple separates, each branch of service requires the service member to financially support their dependents — even without a court order. These branch-specific formulas kick in immediately and stay in effect until a civilian court issues a formal support order. Here's how each branch calculates interim support.

Why Military Support Differs From Civilian Alimony

Civilian alimony is set by a judge based on income, need, and state guidelines. Military interim support is an administrative obligation enforced by the chain of command, calculated using formulas tied to BAH (Basic Allowance for Housing) or gross pay.

Key differences:

• Immediate obligation — no court order required, activated upon separation
• Commander-enforced — non-compliance triggers UCMJ action, not contempt of court
• Formula-based — no judicial discretion, just math
• Temporary — superseded the moment a civilian court issues any support order

These are minimum floors, not maximum caps. A court can (and often does) order more than the branch formula requires.

Army: AR 608-99

The Army uses the simplest formula. A separated soldier must provide dependents a pro-rata share of the Basic Allowance for Housing at the RC/Transient rate with dependents (BAH RC/T-WITH).

Calculation:

• One dependent (spouse only): Full BAH RC/T-WITH rate
• Multiple dependents: BAH RC/T-WITH divided equally among all dependents

Example: An E-6 stationed at Fort Liberty has a BAH RC/T-WITH rate of approximately $1,780/month. If supporting a spouse and two children (3 dependents), each receives roughly $593/month.

If the spouse is also active-duty military, the obligation changes to the BAH-DIFF rate (the difference between the with-dependents and without-dependents BAH rates).

Navy: MILPERSMAN 1754-030

The Navy formula is the most generous to dependents. It calculates support as a fraction of "gross pay" — defined as base pay plus BAH (excluding BAS and hazard duty pay).

Calculation:

Example: A Navy O-3 with base pay of $6,800 + BAH of $2,400 = $9,200 gross. Spouse plus one child = 1/2 = $4,600/month interim support.

No support is required if the spouse is also active-duty Navy. Waivers may be granted for documented spouse desertion, physical abuse by the spouse, or infidelity.

Air Force: AFI 36-2906

The Air Force uses a hybrid formula combining BAH-DIFF and a percentage of basic pay.

Calculation:

Example: An E-7 with base pay of $4,600 and BAH-DIFF of $250. Spouse plus one child = $250 + (25% × $4,600) = $250 + $1,150 = $1,400/month.

The Air Force has an additional enforcement mechanism: if the member fails to support dependents, the command can recoup the with-dependent BAH rate the member has been receiving during non-support periods.

Marine Corps: MCO 5800.16

The Marine Corps uses the simplest per-dependent calculation, capped at a fraction of total pay.

Calculation:

• 1/3 of BAH per dependent
• Total obligation capped at 1/3 of the Marine's total gross monthly pay
• Does not include stepchildren

Example: A Marine E-5 with BAH of $1,800 and two dependents. Per dependent: $600. Total: $1,200/month. If total gross pay is $4,200, cap is $1,400 — obligation stays at $1,200 (under cap).

When These Formulas End

Branch support formulas are interim measures only. They are superseded the moment any of the following occurs:

• A civilian court issues a temporary or permanent support order
• The parties sign a written separation agreement addressing support
• The divorce is finalized with a support provision

Once a civil court order exists, the service member follows the court order regardless of whether it's higher or lower than the branch formula. The branch regulation no longer applies.

Enforcement and Consequences

If a service member refuses to pay interim support:

1. The dependent or their commander can report non-compliance
2. Commanders can issue a direct order to pay under the applicable regulation
3. Continued refusal constitutes violation of a lawful order (UCMJ Article 92)
4. Consequences include: counseling, Letter of Reprimand, Article 15 (non-judicial punishment), or referral to court-martial

However, commanders cannot directly garnish a service member's pay. Only a civil court support order can compel DFAS to withhold wages. This is why getting a formal court order as quickly as possible protects dependents better than relying on branch enforcement alone.

Get the Military Divorce Guide for the branch-specific interim support calculator worksheets and the template for requesting commander enforcement when payments aren't being made.