Legacy High-3 Retirement Explained

High-3 is the retirement system for service members who entered before 2018 and did not opt into the Blended Retirement System.

It is a pure defined-benefit pension. The multiplier is 2.5% per year of service against the average of your highest 36 months of basic pay — the "high three". At 20 years that is 50% of that average, against BRS's 40%.

There is no government TSP match under High-3. You can contribute to the TSP, but the service adds nothing.

The characteristic that defines it, and the reason BRS exists, is the 20-year cliff. Serve 20 years and you receive a pension for life. Leave at 19 and you receive nothing from the retirement system — no pension, and no employer contributions to take with you.

That is a good deal for the minority who serve 20 years and a poor one for the majority who do not. BRS traded some of the pension for portability.

Who is eligible?

Service members who entered before January 1, 2018 and did not opt into BRS during the election window, which has closed.

If you entered from 2018 onward you are on BRS and cannot elect High-3. The choice no longer exists in either direction.

The practical consequence if you are on High-3 and approaching a decision point: the arithmetic of staying is different from a BRS colleague's. Reaching 20 years is worth substantially more to you than to them, and leaving at 18 costs you substantially more.

You can still contribute to the TSP, and doing so is worth it for the tax treatment — just without a match. Reaching retirement on High-3 with no TSP balance is a common and avoidable outcome.

How do I apply?

  • Confirm which system you are actually on: Entry before 2018 without an opt-in means High-3. Many people are unsure, and it changes every calculation.
  • Take the 20-year cliff seriously in any leaving decision: 19 years and 11 months yields nothing from the pension.
  • Contribute to the TSP anyway: There is no match, but the tax treatment still makes it worthwhile — and High-3 gives you nothing portable otherwise.
  • Know your high-36 window: The pension is based on your highest 36 months of basic pay, which is usually your last three years.
  • Model it against BRS if you opted in: The comparison calculator exists for this, and the answer turns on whether you expect to reach 20.
  • Plan for the retired-pay tax position: Retired pay is taxable federally, and state treatment varies.

Common questions

What is the High-3 multiplier?

2.5% per year of service against the average of your highest 36 months of basic pay. At 20 years that is 50% of that average.

Does High-3 include a TSP match?

No. You can contribute to the TSP, but the service adds nothing. That is the main difference from BRS.

What happens if you leave before 20 years on High-3?

You receive nothing from the retirement system — no pension and no portable employer contributions. That cliff is why BRS was introduced.

Can you switch from High-3 to BRS?

No. The opt-in window has closed, and anyone who entered from 1 January 2018 is on BRS automatically.

Which system pays more?

High-3 pays a larger pension if you serve 20 years. BRS is better for the majority who leave earlier, because the TSP balance goes with them.

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