How Much Do You Have to Put in the TSP to Get the Whole 5% Match in 2026?
Five percent. That is the whole answer to the first half of the question, and most people who ask it already suspect as much. The half that costs money is the second half: five percent of basic pay in every pay period. The TSP calculates matching paycheck by paycheck and never trues it up at the end of the year, so there are two separate ways to lose agency money — contributing less than 5%, and contributing so aggressively that you hit the IRS limit in June and then contribute nothing for six months.
Quick answer
Contribute 5% of your basic pay in every pay period. Your agency or service adds 1% automatically whether you contribute or not, then matches your first 3% dollar for dollar and your next 2% at 50 cents on the dollar — 5% of pay in total. At 3% you collect 4% and give up 1%, which is $800 a year on an $80,000 salary. Nothing above 5% is matched. The condition that catches high earners: matching stops in any pay period with no employee contribution, so reaching the $24,500 elective deferral limit before December forfeits the rest of the year's match.
The match is two rates, not one
The phrase "the government matches up to 5%" hides the fact that the money arrives in three pieces at three different rates. TSP.gov states the rule plainly: FERS and eligible BRS participants receive matching on the first 5% of pay contributed every pay period, the first 3% dollar for dollar and the next 2% at 50 cents.
Here is what that produces on $80,000 of annual basic pay — the case the TSP contribution optimizer runs by default:
| You contribute | Automatic | Matching | Agency total | Agency dollars/yr | Your dollars/yr | Match forfeited/yr |
|---|---|---|---|---|---|---|
| 0% | 1% | 0% | 1.0% | $800 | $0 | $3,200 |
| 1% | 1% | 1% | 2.0% | $1,600 | $800 | $2,400 |
| 2% | 1% | 2% | 3.0% | $2,400 | $1,600 | $1,600 |
| 3% | 1% | 3% | 4.0% | $3,200 | $2,400 | $800 |
| 4% | 1% | 3.5% | 4.5% | $3,600 | $3,200 | $400 |
| 5% | 1% | 4% | 5.0% | $4,000 | $4,000 | $0 |
| 10% | 1% | 4% | 5.0% | $4,000 | $8,000 | $0 |
Two things fall out of the table. The first 3% you contribute earns a 100% instant return and the next 2% earns 50% — no other move available to a federal employee is close. And the 1% arrives whether or not you participate, which sounds generous until you notice what it does to a non-contributor: the account grows every pay period, quietly suggesting the TSP is working, while 80% of the available agency money goes unclaimed.
The base is basic pay, including locality pay for civilians. Overtime, awards, bonuses, and allowances are not matched.
What 3% actually costs, carried to retirement
Take a 40-year-old GS employee on $80,000 with 25 years to go, contributing 3%, assuming 7% growth a year:
- Her money: 3% × $80,000 = $2,400 a year.
- Agency money at 3%: 1% automatic ($800) + 3% match ($2,400) = $3,200.
- Agency money at 5%: $800 + 4% match ($3,200) = $4,000.
- Forfeited: $800 a year, every year, for as long as she stays at 3%.
- Cost of fixing it: the extra 2% is $1,600 a year, or $61.54 per biweekly paycheck. Traditional contributions come out pre-tax, and at $80,000 minus the $16,100 standard deduction she is in the 22% bracket, so take-home falls by about $48 a period, not $62.
- What it becomes: $5,600 a year at 7% for 25 years compounds to about $354,000. At 5% she is putting away $8,000 a year, which reaches about $506,000. Of that $152,000 difference, $50,600 is agency money she was otherwise declining.
Forty-eight dollars a paycheck for fifty thousand dollars of somebody else's money is the best trade in the federal benefits package. Run your own pay and percentage through the TSP match and balance projection to see the forfeited figure for your salary and the balance it builds by your retirement date.
The other way to lose it: hitting $24,500 too early
This one hits the people who are trying hardest. Matching is calculated on what you contribute in each pay period, and TSP.gov is blunt about the consequence: no employee contribution in a pay period means no matching contribution for that pay period.
Payroll stops your deferrals the moment you reach the annual elective deferral limit — $24,500 for 2026 under IRS Notice 2025-67. The automatic 1% keeps arriving. The 4% match does not.
A GS-15 on $150,000 who elects 35% of pay contributes $2,019 a pay period and crosses $24,500 during the 13th. Pay periods 14 through 26 then pass with no employee contribution and therefore no match: 13 periods × 4% × $5,769 of biweekly basic pay = $3,000 of agency money gone, for the sin of saving faster.
The fix is division. $24,500 ÷ 26 pay periods = $942.31. On $150,000 that is 16.33% of biweekly pay, so elect 16% and you finish the year at $24,000 with all 26 matches intact; if your payroll office takes a whole-dollar election instead of a percentage, $942 a period lands on $24,492. Either beats 35% by three thousand dollars.
Over 50, the trap changes shape
Since the TSP moved to the spillover method, catch-up contributions are no longer a separate election. Once your contributions reach the elective deferral limit, anything further automatically counts toward the catch-up limit — and TSP.gov confirms those catch-up dollars still qualify for matching, up to 5% of salary. So a catch-up-eligible participant does not fall off the match at $24,500; they fall off at their own ceiling:
| Your age during 2026 | Born | Your own ceiling | Per pay period over 26 |
|---|---|---|---|
| Under 50 | 1977 or later | $24,500 | $942.31 |
| 50–59 | 1967–1976 | $32,500 | $1,250.00 |
| 60–63 | 1963–1966 | $35,750 | $1,375.00 |
| 64 and over | 1962 or earlier | $32,500 | $1,250.00 |
The row that catches people is the last one. The 60–63 catch-up is a four-year window, not a new floor, and your election carries over into the year you turn 64 unless you change it. TSP.gov warns about exactly this: keep contributing at the $1,375 pace and you reach the lower $32,500 ceiling during pay period 24, losing the match in the last two periods — about $554 on $180,000 of basic pay. Lower the election in January of the year you turn 64.
One more 2026 change that does not cost you match but does change your paycheck: if your 2025 wages from a TSP-eligible federal position exceeded $150,000, your catch-up contributions must be Roth. The switch happens automatically for most people once total contributions pass $24,500.
Vesting: only the 1% is at risk
Your own contributions and the 4% matching portion are yours the moment they land. The automatic 1% is the only piece subject to vesting: three years of federal civilian service for most FERS employees, two years for certain positions including congressional and some non-career jobs. Leave before then and the 1% plus its earnings is forfeited — the match is not.
Service members under the Blended Retirement System run on different timing rules: the automatic 1% starts after 60 days and vests at two years, and matching begins at the start of the third year of service. The BRS-specific version of this arithmetic, including combat-zone pay, is in how much to put in the TSP for the full BRS match.
Where the match sits in the whole picture
Capturing 5% is a floor, not a plan. Federal retirement has three legs, and the TSP is the only one you control the size of — the pension is fixed by a formula you can estimate with the FERS pension calculator, and Social Security is fixed by your earnings record. A 5% contribution plus 5% agency money is a 10% savings rate, which is roughly the minimum that produces a recognizable retirement. Each additional 1% of pay is unmatched but still compounds; the painless route is to raise the election by one point at every January pay adjustment, so take-home never actually falls. Check what one more percent of pay is worth by your retirement date before you decide it is not worth the trouble.
FAQ
Does the agency's 5% count against my $24,500 limit?
No. The elective deferral limit covers only the traditional and Roth contributions you elect from your own pay. Agency automatic (1%) and matching contributions count against a different ceiling: the IRC §415(c) annual additions limit, $72,000 for 2026, applied per employer. Catch-up contributions are excluded from the annual additions limit entirely.
I contribute 10%. Am I getting a bigger match than someone at 5%?
No. Matching caps at 4% of basic pay plus the 1% automatic, so both of you receive 5% of pay from the agency. On $80,000 that is $4,000 either way. The extra 5% is still worth contributing — it is simply your money compounding rather than free money, and at 7% over 25 years an extra $4,000 a year is worth about $253,000 on its own.
I have a civilian TSP account and a uniformed services TSP account. Do I get two limits?
No. TSP.gov is explicit that the IRS limits apply to your combined contributions across both accounts, so $24,500 is the total. The match is separate: each employer matches on its own basic pay against your contributions from that pay, and the §415(c) annual additions limit is applied per employer.
I stopped contributing for three months this year. Can I make it up in December?
Not for the match. The TSP does not true up at year end — if there are no employee contributions in a pay period, there is no matching contribution for that pay period, and no later contribution restores it. Three months is about six biweekly pay periods, so on an $80,000 salary that is 6 × 4% × $3,077 = $738 of agency money you cannot get back. What you can do is get back to at least 5% of pay for every remaining period, and if you have room under $24,500 you can add unmatched dollars to catch up on the savings itself.
Sources
- TSP — Contribution types (agency automatic 1%, matching, catch-up)
- TSP — Contribution limits
- IRS Notice 2025-67 — 2026 retirement plan limitations
- 5 U.S.C. §8432(c) — the statutory agency contribution schedule (1% automatic, dollar-for-dollar on the first 3%, 50% on the next 2%)