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TSP Contribution Limits 2026: Elective Deferral, Catch-Up, and the Match

Every January the IRS adjusts retirement plan limits for inflation, and the TSP follows. For 2026 the headline number is $24,500: the most you can put into the TSP from your own pay during the calendar year, whether it goes into traditional, Roth, or a mix of both. This guide covers that limit, the catch-up rules for participants 50 and older, what the limits do and do not include, and the pay-period trap that costs high earners thousands in lost matching money.

The 2026 elective deferral limit: $24,500

The elective deferral limit comes from section 402(g) of the tax code, and it caps the traditional (pre-tax) plus Roth (after-tax) contributions you make as an employee during the calendar year. For 2026 that cap is $24,500, up $1,000 from the $23,500 limit in 2025. The combined total of your traditional and Roth contributions cannot exceed it.

Several things are excluded from this limit, and the exclusions matter. Agency automatic 1% contributions do not count. Agency matching contributions do not count. Catch-up contributions do not count. Traditional contributions made from tax-exempt combat-zone pay do not count. Rollovers from other retirement plans do not count. The TSP will not accept employee contributions above the limit: if a payroll office submits an overage for someone who is not catch-up eligible, the TSP rejects the excess, and once you reach the cap your contributions stop for the rest of the year.

Catch-up contributions: $8,000, and $11,250 for ages 60 to 63

If you are age 50 or older at any point during the calendar year, you may contribute beyond the elective deferral limit. For 2026 the standard catch-up limit is $8,000, up from $7,500 in 2025. Under a SECURE 2.0 change, participants who are 60, 61, 62, or 63 during the year get a higher limit of $11,250, unchanged from 2025. This is sometimes called the super catch-up.

That produces three combined maximums for your own contributions in 2026:

You do not make a separate catch-up election. The TSP uses the spillover method: once your contributions pass $24,500, the excess automatically spills over and counts toward your catch-up limit, as long as you are eligible by age.

The 2026 Roth catch-up rule for high earners

Starting in 2026, a SECURE 2.0 provision changes how catch-up contributions work for higher earners. If your prior-year wages from your TSP employer exceeded $150,000 (your 2025 wages, for 2026 purposes), your catch-up contributions must go into the Roth TSP, not traditional. Payroll offices use Box 3 of your W-2, your Social Security wages, to make the call.

If your prior-year wages were at or below the threshold, nothing changes: your catch-up money can go to traditional, Roth, or both. But if you are above the line, plan for the tax treatment now, because Roth catch-up contributions are after-tax and will not reduce your current taxable income.

The annual additions limit: $72,000

There is a second, larger ceiling that few participants ever approach: the section 415(c) annual additions limit, $72,000 for 2026. This one counts everything going into the account, your contributions plus the agency automatic 1% and matching contributions, but not catch-up contributions and not rollovers. Unless your salary is very high and you are maxing every source, this limit will not bind you. It exists mainly so highly compensated participants cannot stuff unlimited agency money into the plan.

The costly mistake: hitting the cap too early

Here is the trap the TSP itself warns about. Matching contributions are calculated from what you contribute each pay period. If you contribute aggressively early in the year and hit $24,500 with pay periods left, your contributions shut off, and the match shuts off with them. You keep the automatic 1%, but the up-to-4% match is gone for every remaining pay period.

Take a concrete example. Suppose you earn $150,000 and contribute 20% of salary, about $1,154 per biweekly pay period. You hit $24,500 around pay period 21 of 26, and for the last five pay periods you contribute nothing, so the agency contributes only the 1% automatic. Those five missed pay periods cost roughly $1,150 in matching money you can never get back.

The fix is arithmetic. Divide $24,500 by the number of pay dates in the year, usually 26, which gives about $942 per pay period, and set your contribution so you land on the cap with the final paycheck. If you contribute a percentage of salary instead of a dollar amount, the percentage naturally scales with raises, but recheck the math after any pay change. And if you are catch-up eligible, remember the spillover: contributions beyond $24,500 keep flowing as catch-up, and the match question only concerns the elective deferral portion.

Traditional vs Roth: the limit treats them the same

The $24,500 cap does not care which tax treatment you choose. $24,500 of traditional, $24,500 of Roth, or $15,000 of one and $9,500 of the other all hit the same ceiling. The difference is when you pay tax: traditional contributions reduce this year's taxable income and are taxed on withdrawal, while Roth contributions are after-tax now and qualified withdrawals are tax-free. Your agency's contributions always go into the traditional balance, regardless of where you put your own money.

Which to choose depends on your current tax bracket versus your expected bracket in retirement, and it is worth a conversation with a tax professional. What the limit means mechanically is simple: pick a mix, and the sum cannot exceed $24,500 (plus catch-up if eligible).

Model your own contribution level with our TSP growth calculator, which flags when your annual contribution approaches or exceeds the 2026 limit and shows the agency match dollars separately. Verify every figure here at tsp.gov before acting on it.

Data current as of October 2026. Source: Thrift Savings Plan (tsp.gov), 2026 contribution limits bulletin.

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