Understand the BRS automatic 1% contribution, service matching of up to 4%, timing, vesting, and the 5% member-contribution level associated with the full match.
Reviewed August 12, 2026
Under BRS, the service automatic contribution equals 1% of basic pay and does not depend on the member contributing. Separate service matching contributions can add up to 4% of basic pay when the member contributes enough.
That means the commonly described 5% government amount is 1% automatic plus as much as 4% matching. It is not a dollar-for-dollar 5% match, and the member's own contribution is separate from both service amounts.
The official BRS guide shows a 1% service match when the member contributes 1%, 2% when the member contributes 2%, 3% when the member contributes 3%, 3.5% when the member contributes 4%, and the maximum 4% match when the member contributes 5% or more.
With a 5% member contribution, the account can therefore receive 5% from the member, 1% automatic from the service, and 4% service matching for a total contribution equal to 10% of basic pay before investment gains or losses.
The official guide states that the service automatic 1% contribution begins after 60 days and that matching begins at the start of the 25th month of service for new accessions under BRS. Service contributions continue through the applicable BRS service window.
Members are always vested in their own contributions and earnings. The service automatic 1% contribution generally vests after two years of service, while matching contributions are vested when deposited under the guide's standard new-accession timeline. Verify individual records before making a separation decision.
Service automatic and matching calculations use basic pay, not BAH, BAS, a tax refund, or total take-home pay. A member contribution election can also apply differently to basic, special, incentive, or bonus pay, subject to plan and annual limits.
MyMilPay models the core monthly BRS service amount from basic pay. It does not determine eligibility, correct a contribution election, or guarantee that a payroll change will take effect in a particular pay period.
A member who reaches the annual elective-deferral limit before the final pay periods can miss later matching contributions if no eligible member contribution remains in those periods. Contribution planning should consider the full year rather than only the maximum percentage available today.
Use the TSP calculator for scenarios, then verify current limits, election timing, combat-zone rules, Traditional versus Roth treatment, and actual deposits through the pay system and TSP account. Investment return assumptions are not guaranteed.