TSP Front-Loading Costs You the Match: The Table by Grade

Last Updated: July 29, 2026 Reading Time: 8 min

Max out your TSP by June and your agency quietly stops paying you. Not your salary, your match: the 4% FERS matching contribution ends the moment you hit the $24,500 annual limit, and it does not come back in a year-end correction. The employees this bites hardest are the diligent ones, because front-loading feels like discipline.

Why the Match Stops: The Per-Pay-Period Rule

The TSP match is not an annual benefit. It is a per-pay-period calculation: each pay period, your agency matches your contribution dollar-for-dollar on the first 3% of basic pay and 50 cents on the dollar for the next 2%. Contribute nothing in a pay period and the match for that period is zero, permanently.

The Interior Business Center, which runs payroll for dozens of agencies, states it plainly: "If you reach the IRS elective deferral limit before the end of the year, employee contributions will stop, and so will matching contributions."

That sentence is the whole trap. The TSP system enforces the $24,500 limit automatically. Once your cumulative contributions hit it, payroll stops deducting, and a zero deduction means a zero match, pay period after pay period, until January resets the counter.

Unlike many private-sector 401(k) plans, the TSP has no "true-up" provision that reconciles your match at year-end. What you miss is gone.

The One-Number Fix: $942

Divide the limit by the pay periods: $24,500 ÷ 26 = $942 per biweekly pay period (the last period comes out slightly smaller). Set your contribution to a dollar amount, not a percentage, and you will reach the limit in pay period 26 with the match intact all year.

Two wrinkles worth checking:

• 27-pay-date years. Some agencies have 27 pay dates in 2026 depending on their payroll calendar. If yours does, the number is $907. Your payroll provider's TSP percentage chart will say.
• Percentage-based contributions drift. If you contribute a percentage of salary, a mid-year raise or promotion accelerates you toward the limit faster than you planned. Dollar amounts don't drift.

If you got a raise, changed grades, or bumped your contribution this year, check your year-to-date deferrals now at tsp.gov. If you are on pace to hit $24,500 before the last pay period, lower the per-period amount so the remaining room spreads across the remaining periods.

Already Front-Loaded This Year? Do This

If you will hit the limit early and you are under 50, you cannot un-contribute. What you can do:

1. Recompute the remaining room today. Take $24,500 minus your year-to-date deferrals and divide by the pay periods left. Set that as your new per-period dollar amount immediately; every period you delay locks in another missed match.
2. Turning 50 this year (or older)? You may not have a problem at all. See the spillover rule below.
3. Bank the lesson for January. Set $942 (or $907 for a 27-period year) as your new-year amount before the first pay period closes.

The Spillover Rule: Why 50+ Employees Are Mostly Safe

Since 2021, catch-up contributions work by spillover: there is no separate catch-up election. If you are 50 or older (or will turn 50 this calendar year), contributions past $24,500 automatically spill into your catch-up allowance, an extra $8,000, or $11,250 if you are 60 to 63 under the SECURE 2.0 super catch-up.

The part that matters here: matching continues on spillover contributions. A 52-year-old GS-14 contributing aggressively does not lose the match at $24,500; the payroll system keeps deducting into the catch-up bucket, and the match keeps riding along, up to $32,500 in total contributions.

Under 50, there is no bucket to spill into. The system just stops. That is why this trap disproportionately hits younger, high-saving employees, exactly the people trying hardest to do it right.

The "Market Exposure" Argument Doesn't Survive the Math

The case for front-loading is real but small: money contributed in February is invested longer than money contributed in November. In an average year, that extra exposure on a $24,500 contribution is worth a few hundred dollars, and in a down year it is worth negative money.

The match you forfeit is a guaranteed, immediate 100% return on the first 3% of pay and 50% on the next 2%. For a GS-13, that is $2,761 of certain money traded for a market-timing bet worth less than half that on average. There is no grade in the table where the trade makes sense.

Run your own numbers, including what the missed match compounds to by retirement, with the TSP Calculator. And for the separate question of whether to contribute early in your career versus catching up later, see the companion piece on TSP contribution timing, where the compounding math lives.

Calculate Your TSP Trajectory

A missed match doesn't just cost this year's dollars; it costs decades of growth on them. Use the free TSP Calculator to see what your contributions plus the full match compound to by your retirement date. Try it now →

Frequently Asked Questions

What happens to my TSP match if I hit the $24,500 limit before December?

Your contributions stop automatically at the limit, and the 4% match stops with them because matching is computed per pay period. Only the 1% automatic contribution continues. There is no year-end true-up.

How much should I contribute per pay period to max the TSP without losing the match?

$942 per biweekly pay period in 2026 ($24,500 ÷ 26). If your agency's payroll calendar has 27 pay dates this year, use $907.

Does the 1% automatic agency contribution stop too?

No. The 1% automatic is paid on basic pay regardless of whether you contribute. Only the matching portion depends on your per-period contribution.

I'm 50 or older. Does front-loading still cost me the match?

Usually not. Contributions past $24,500 spill into your catch-up allowance ($8,000 extra, or $11,250 at ages 60 to 63) and matching continues on them. The trap mainly affects employees under 50.

Is front-loading ever worth it despite losing the match?

For FERS employees, essentially no. Extra market exposure is worth a few hundred dollars in an average year; the forfeited match is $1,300 to $3,800 of guaranteed money depending on grade.

Related Resources

• TSP Calculator: Project your balance with the full match intact
• TSP Contribution Timing: Early vs Late: The career-long compounding companion to this post
• Best TSP Allocation by Age: Where the contributions should go once they're in
• TSP Milestone Benchmarks by Age: Whether your balance is on track
• GS Pay Calculator: The salary figures behind this post's table

Sources: IRS 2026 contribution limits (IR-2025-111) · TSP.gov contribution limits · DOI Interior Business Center payroll notice · OPM 2026 DC locality salary table