Military Retirement Planning Guide: Legacy, BRS, and TSP
Military retirement planning can feel complicated because the rules are different depending on when you joined and which system applies to you. A simple explanation helps you understand whether the legacy pension, BRS, or TSP strategy makes more sense for your goals.
Key questions many members ask
- Which retirement system applies to me?
- How do Legacy and BRS differ?
- How much does TSP contribution matter?
- What does a retirement calculator estimate?
Legacy vs BRS at a glance
If you joined the military before January 1, 2018 you are under the legacy retirement system, which offers a 2.5% monthly pension multiplier and no TSP match. If you joined on or after 2018, you are under the Blended Retirement System (BRS), which pays a 2.0% monthly pension plus an automatic 1% TSP contribution and dollar-for-dollar matching up to 5%. BRS also gives you a 12-year continuation bonus and a defined-contribution balance if you separate before 20 years.
Why this matters
Retirement planning works best when you understand the basic structure first. The calculator gives you a starting point, but the bigger decision is how to combine pension, TSP, and lifestyle expectations over time. Most BRS members focus on maximizing the 5% TSP match, since the monthly pension alone is smaller than under legacy.
TSP and the power of compounding
For many service members, TSP contributions matter more than the pension multiplier. With the 2026 IRS elective deferral limit at $24,500, a 20-year career with disciplined 10% contributions can build a balance well into seven figures. Pairing TSP with the pension and Social Security creates a three-legged retirement that is hard to disrupt. For a deep dive into TSP mechanics, see our TSP and retirement guide.
Helpful tools
Use our retirement calculator to estimate pension value, compare Legacy vs BRS, and review how TSP factors into your planning. For TSP-specific projections, see our TSP withdrawal calculator. Education benefits are also part of long-term planning — see our GI Bill guide.
Bottom line
The earlier you understand your retirement system, the easier it becomes to make decisions about serving longer, contributing to TSP, and planning for the transition to civilian life.
Frequently asked questions
What is military retirement?
Military retirement is a pension program that pays a defined monthly benefit to service members who serve the minimum required years (typically 20). Under the legacy system, the benefit equals 2.5% of your average highest 36 months of base pay, multiplied by years of service. Under BRS, it is 2.0% plus an automatic 1% TSP contribution and matching up to 5%.
What is the difference between Legacy and BRS?
Legacy retirement (pre-2018) offers 2.5% per year of service with no TSP match. BRS (Blended Retirement System, 2018 and later) offers 2.0% per year plus a 1% automatic TSP contribution, dollar-for-dollar TSP matching up to 5%, and a continuation bonus at 12 years. BRS also gives a defined contribution benefit if you separate before 20 years.
Who qualifies for BRS?
Service members who joined the military on or after January 1, 2018 are automatically enrolled in BRS. Service members who joined before 2018 could opt into BRS during the original opt-in window (2018-2019).
How much is military retirement pay?
An E-7 with 20 years under BRS receives approximately 40% of their average high-3 base pay (2.0% x 20). A lieutenant colonel with 20 years under Legacy receives 50% (2.5% x 20). The check continues for life and is indexed for inflation.
How much should I contribute to TSP?
Most financial planners recommend contributing at least 5% to capture the full BRS match. Contributing 10% to 15% is a common target for service members who can afford it. The 2026 TSP elective deferral limit is $24,500 (with $7,500 catch-up if 50+).
What is the multiplier for retired pay?
Legacy retirement uses a 2.5% multiplier applied to years of service. BRS uses a 2.0% multiplier. For both, the multiplier is multiplied by the number of years served and the average of your highest 36 months of base pay (High-3).
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Related tools: Retirement calculator • TSP withdrawal calculator • GI Bill calculator
Related guides: TSP and retirement guide • GI Bill guide • DD-214 explained