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TSP Matching Explained: How to Get the Full 5% Government Match

Updated September 16, 2026 · 6 min read · By the MilPayLab team

Under the Blended Retirement System, the government will put up to 5% of your basic pay into your Thrift Savings Plan. Most of that money only arrives if you contribute too. Here is exactly how the match works, and the few ways people accidentally leave it on the table.

Two kinds of government contributions

BRS members receive two separate contributions from their service, both calculated as a percentage of basic pay (not BAH, BAS or special pays):

Put together: contribute 5% of basic pay and the government adds 5% (1% automatic + 3% + 1%). Contributing more than 5% is fine — and often wise — but it doesn't increase the match.

The match at each contribution rate

Here's what it looks like for an E-4 with over 2 years of service, earning $3,303.00 a month in basic pay:

You contributeAutomaticMatchGovernment totalYou / monthGovernment / month
0%1%0%1%$0.00$33.03
1%1%1%2%$33.03$66.06
2%1%2%3%$66.06$99.09
3%1%3%4%$99.09$132.12
4%1%3.5%4.5%$132.12$148.63
5%1%4%5%$165.15$165.15
6%1%4%5%$198.18$165.15

Dropping from 5% to 3% saves this member $66.06 a month but costs $33.03 in matching — money that would have compounded for decades.

The match climbs until you contribute 5%Government contribution (automatic 1% + match) at each rate. Dollar amounts for an E-4 earning $3,303.00 are in the table above.
  • You contribute
  • Government adds
0%2%4%6%0%1%2%3%4%5%6%Your contribution (% of basic pay)Full match at 5%You contribute 0%: $0.00/monthGovernment adds 1%: $33.03/monthYou contribute 1%: $33.03/monthGovernment adds 2%: $66.06/monthYou contribute 2%: $66.06/monthGovernment adds 3%: $99.09/monthYou contribute 3%: $99.09/monthGovernment adds 4%: $132.12/monthYou contribute 4%: $132.12/monthGovernment adds 4.5%: $148.63/monthYou contribute 5%: $165.15/monthGovernment adds 5%: $165.15/monthYou contribute 6%: $198.18/monthGovernment adds 5%: $165.15/monthGovernment addsYou contributestays 5%

Rules: 5 U.S.C. § 8440e and TSP. Pay: 2026 DFAS pay table.

When contributions start and stop

The timeline is set by law (5 U.S.C. § 8440e):

Members who joined after October 1, 2020 are automatically enrolled to contribute 5% of basic pay, invested in an age-appropriate Lifecycle (L) Fund. You can change or stop contributions, but if you opt out, you'll be automatically re-enrolled each calendar year — a safeguard against forgetting to restart.

Vesting: when the money is yours

Your own contributions and the matching contributions, plus their earnings, belong to you immediately. The automatic 1% contributions vest after 2 years of service. If you leave before then, those automatic contributions and their earnings are forfeited.

All government contributions go into your traditional (pre-tax) TSP balance, even if your own contributions are Roth. The match applies equally to traditional and Roth contributions.

The 2026 limits — and the front-loading trap

For 2026 you can contribute up to $24,500 in regular elective deferrals. If you're 50 or older you can add up to $8,000 in catch-up contributions, or up to $11,250 if you turn 60, 61, 62 or 63 in 2026. Total annual additions, including government contributions and tax-exempt combat zone contributions, are capped at $72,000.

Here's the trap. Matching only happens in a pay period when you contribute. If you contribute a large percentage early in the year and hit $24,500 in, say, September, your contributions stop for the rest of the year — and so does the match for those months. The automatic 1% continues, but up to 4% of basic pay for the remaining months is lost for good.

The fix is to spread contributions across all 24 pay periods. Divide the limit by your expected basic pay for the year to find a percentage that reaches $24,500 in December, not before. Keep in mind that pay raises, promotions and bonuses contributed from can speed you toward the limit.

Common ways people miss the match

Traditional or Roth — does it change the match?

No. Your service matches the percentage of basic pay you contribute, whether you choose traditional (pre-tax) or Roth (after-tax) contributions, or split between them. The only difference is where the money lands: your own contributions go to the balance you pick, while every government dollar goes to the traditional balance and will be taxed when withdrawn. Many junior members choose Roth because their tax rate is low now, and a large share of their pay — BAH and BAS — isn't taxed at all. Contributions made from tax-exempt combat zone pay can go into Roth, where qualified withdrawals of both the contributions and their earnings are tax-free.

What happens when you leave the military

Your TSP account stays yours when you separate. You can leave it invested, keep it growing with low fees, roll it into an IRA or a new employer's plan, or withdraw it. Withdrawals are generally taxable, and taking money out before age 59½ can trigger an additional 10% early-withdrawal tax unless an exception applies. For BRS members who leave before 20 years, the TSP is the retirement benefit they take with them, so cashing it out early gives up most of its long-term value.

How much it can grow

The match matters most because of time. In our TSP calculator's default example — a 24-year-old with 3 years of service contributing 5% until 20 years of service, with a 6% annual return and 2.5% yearly raises — the government's contributions total about $43,600, and the account reaches roughly $500,000 by age 60. Your own numbers will differ, and returns aren't guaranteed, but the pattern holds: the earlier the match starts compounding, the more it's worth.

Where the balance comes from over timeProjected balance every three years: age 24, 3 years of service, 5% under BRS until 20 years, $8,000 start, 6% return, 2.5% raises.
  • You (incl. starting balance)
  • Government
  • Investment growth
$0$100K$200K$300K$400K$500KAge 27 — You (incl. starting balance): $14,426Age 27 — Government: $6,426Age 27 — Growth: $2,67227Age 30 — You (incl. starting balance): $21,347Age 30 — Government: $13,347Age 30 — Growth: $8,398Age 33 — You (incl. starting balance): $28,799Age 33 — Government: $20,799Age 33 — Growth: $17,95733Age 36 — You (incl. starting balance): $36,825Age 36 — Government: $28,825Age 36 — Growth: $32,290Age 39 — You (incl. starting balance): $45,468Age 39 — Government: $37,468Age 39 — Growth: $52,53739Age 42 — You (incl. starting balance): $51,596Age 42 — Government: $43,596Age 42 — Growth: $79,898Age 45 — You (incl. starting balance): $51,596Age 45 — Government: $43,596Age 45 — Growth: $113,34345Age 48 — You (incl. starting balance): $51,596Age 48 — Government: $43,596Age 48 — Growth: $153,177Age 51 — You (incl. starting balance): $51,596Age 51 — Government: $43,596Age 51 — Growth: $200,61951Age 54 — You (incl. starting balance): $51,596Age 54 — Government: $43,596Age 54 — Growth: $257,124Age 57 — You (incl. starting balance): $51,596Age 57 — Government: $43,596Age 57 — Growth: $324,42157Age 60 — You (incl. starting balance): $51,596Age 60 — Government: $43,596Age 60 — Growth: $404,57460$499,765 at age 60Age at end of year

Projection from the MilPayLab TSP calculator's model: 2026 IRS limits, 5 U.S.C. § 8440e. Returns are an assumption, not a guarantee.

See what your contribution rate grows to — and whether you would hit the limit early — with the TSP calculator.

Sources

MilPayLab is not affiliated with, endorsed by, or connected to the U.S. Department of Defense, DFAS, DTMO or the Department of Veterans Affairs. Figures are taken from published government rate tables and are provided for information only, not as financial, legal or tax advice. Your finance office, your LES and your VA decision letter are the final word on what you are paid.

Tools for this topic

TSP CalculatorProject your balance with the BRS match.Military Retirement CalculatorSee the pension that goes with it.Military Pay CalculatorFind your monthly basic pay.