Under the Blended Retirement System (BRS), the government helps fund your Thrift Savings Plan (TSP) — but only if you understand how the match works. Get it right and you collect a guaranteed 5% of your basic pay every year. Get it wrong and you leave free money on the table.
Add it up and contributing 5% of your basic pay unlocks the maximum 5% government contribution:
| You contribute | Automatic | Match | Total government |
|---|---|---|---|
| 0% | 1% | 0% | 1% |
| 1% | 1% | 1% | 2% |
| 2% | 1% | 2% | 3% |
| 3% | 1% | 3% | 4% |
| 4% | 1% | 3.5% | 4.5% |
| 5% | 1% | 4% | 5% |
| 10% | 1% | 4% | 5% (no extra) |
Your own contributions and all government matching contributions are yours immediately. The automatic 1% contributions generally vest after two years of service — leave before then and you forfeit just that automatic portion (not your own money or the match).
The IRS elective deferral limit for 2026 is $24,500 across the year. If you front-load contributions and hit the limit early, your own deposits stop — and so can your match in those remaining months, since the match is tied to what you contribute each pay period. Spreading contributions across all 12 months helps ensure you capture the full annual match.
Even if your own contributions go into the Roth TSP, all government automatic and matching contributions go into your Traditional (pre-tax) balance, and will be taxed when you withdraw them in retirement.
Numbers make it concrete. Imagine your basic pay is $4,000 a month — $48,000 a year. (Pull your own basic pay from your LES; the percentages work the same at any rank.)
| Your rate | You put in / year | Government adds / year | Total into TSP / year |
|---|---|---|---|
| 3% | $1,440 | $1,920 (1% auto + 3% match) | $3,360 |
| 4% | $1,920 | $2,160 (1% + 3.5%) | $4,080 |
| 5% | $2,400 | $2,400 (1% + 4%) | $4,800 |
At 5%, the government hands you $2,400 every year — a guaranteed 100% return on your first 3% of pay and 50% on the next 2%, before your investments earn a single dollar. Stop at 3% and you forfeit about $480 a year; contribute nothing and you forfeit the full $2,400, keeping only the automatic 1%.
A common point of confusion: the match is calculated on your basic pay, not total compensation. Bonuses, special pay, incentive pay, and allowances such as BAH and BAS are not matched. You may still contribute to your TSP from bonuses and special pay — often a smart move — but those deposits generate no additional match. Only basic-pay contributions, up to 5%, unlock government matching.
While serving in a designated combat zone, your pay may be tax-free under the Combat Zone Tax Exclusion (CZTE). Contributing to the Roth TSP during those months is especially powerful: the money goes in tax-free and, if the rules are met, comes out tax-free in retirement — a rare "never taxed" outcome. Your basic-pay match continues during deployment as well.
See how the match grows your TSP over a career →Yes. Your contribution type — Roth or Traditional — has no effect on whether you earn the match. The match itself is always deposited into your Traditional balance, but you receive it in full as long as you contribute at least 5% of basic pay.
You keep every dollar of your own contributions and all government matching contributions immediately. Only the automatic 1% agency contribution carries a two-year vesting requirement; leave before then and you forfeit just that automatic 1% portion.
No. The automatic 1% is contributed whether or not you put in anything yourself. The match — up to 4% more — is separate and only happens when you contribute. Together they total up to 5%.
No. The government contribution maxes out at 5% of basic pay. Contributing more than 5% is still wise for your own savings, but it earns no additional match.
No. The IRS elective-deferral limit ($24,500 in 2026) applies only to your contributions. Government automatic and matching contributions do not count toward it; they fall under a separate, much higher total-additions limit.
Related reading: BRS vs. High-3 explained · Roth vs. Traditional TSP