TSP Contribution Limits 2026: Maximize Your Federal Match and Super Catch-Up

Every dollar of agency matching is a 100% immediate return on your contribution — but only if you don't hit the IRS limit too early in the year. This guide covers the 2026 limits, the matching formula, the early-limit trap, and the significant super catch-up opportunity for federal employees aged 60–63.

2026 TSP contribution limits at a glance

The super catch-up applies only to ages 60, 61, 62, and 63. If you turn 64 in 2026, you return to the $8,000 standard catch-up. SECURE 2.0 §109 introduced the higher amount specifically for the four years before Medicare eligibility — the same window that also tends to be the best Roth conversion years for FERS retirees.

The agency matching formula — FERS only

FERS participants (virtually all federal employees hired after December 31, 1983) receive employer contributions in two parts. CSRS employees do not receive agency matching.

The break-even: at 5% of pay contributed, your agency matches 4% (3% + 1%), plus the automatic 1%, for a total agency contribution of 5%. Contribute less than 5% and you leave money on the table. Contribute more than 5% and you get no additional matching — only the tax-advantaged growth on your own additional contributions.¹

The early-limit trap: why you must spread contributions across the year

This is the most common and most costly TSP mistake for high earners. If you hit the $24,500 limit before the final pay date of the calendar year, your agency matching stops for the rest of the year. The agency only matches pay periods in which you are actively contributing. Once you hit the cap, contributions halt — and so does the match.

A GS-15 or SES employee who front-loads contributions to maximize early in the year may hit $24,500 by October. Two or three pay periods of lost matching at 4% of pay can cost $1,000–$2,000 per year, permanently. Over a 10-year career, that's a five-figure mistake in today's dollars.

TSP uses a spillover method starting in 2020: once you reach the regular $24,500 limit, your contributions automatically continue as catch-up contributions (if you're age 50+) rather than stopping entirely. But this only works if you elected catch-up contributions. If you're under 50, or if you maxed contributions in a single lump sum early in the year, the matching still stops when the limit is reached.²

The super catch-up at ages 60–63: SECURE 2.0's biggest TSP benefit

SECURE 2.0 Act §109 created a "super catch-up" for retirement plan participants in the four years before their plan's normal retirement age — for TSP purposes, the four calendar years in which you turn ages 60, 61, 62, and 63.

In 2026, the super catch-up limit is $11,250, versus the standard $8,000 catch-up. That's an additional $3,250/year in TSP contributions during exactly the years when most federal employees are approaching MRA+30 or MRA+20 retirement windows.

The math: a 62-year-old FERS employee in 2026 can contribute:

• $24,500 regular deferral
• $11,250 super catch-up
• $5,500+ agency contribution (at 5% of pay)
• Total: ~$41,250 in annual TSP retirement savings

If you're in this age window and not contributing at the maximum, you're leaving behind one of the most valuable years of tax-deferred accumulation in your federal career. These contributions grow tax-deferred (Traditional) or tax-free (Roth), and the years at 60–63 are often the last full years before retirement — money you put in now has minimal time at risk while potentially delivering years of tax-free or tax-deferred growth.

After age 63, the catch-up limit drops back to the standard $8,000 at age 64. The four-year window is finite. Miss it and you can't go back.

Mandatory Roth catch-up for high earners (SECURE 2.0 §603)

Starting January 1, 2026, SECURE 2.0 §603 requires that employees whose prior-year FICA wages exceeded $150,000 must make their catch-up contributions to the Roth (after-tax) TSP — they cannot make traditional pre-tax catch-up contributions.³

The threshold for 2026 is based on 2025 FICA wages. FICA wages generally equal your Box 3 (Social Security wages) on your W-2: base salary, locality pay, bonuses, shift differentials, and most taxable fringe benefits. TSP traditional contributions themselves do not reduce FICA wages.

What this means in practice:

• Your regular contributions up to $24,500 — still your choice: Traditional or Roth, or any split.
• Your catch-up contributions ($8,000 standard, or $11,250 super) — if your 2025 FICA wages exceeded $150,000, these must go into Roth TSP in 2026.
• Payroll offices are required to route catch-up contributions to Roth automatically for affected employees. TSP records the designation accordingly.

Vesting: when the agency contributions actually become yours

Agency contributions come with a vesting schedule. Until vested, the agency contribution balance is forfeited if you leave federal service.

For most career FERS employees, vesting is a non-issue — they've long passed 3 years. But if you joined federal service mid-career and are considering leaving before your third year anniversary, verify your automatic 1% vesting date before you go. At $120,000/year, 1% per year for 3 years is $3,600 in agency automatic contributions, plus investment returns.

Traditional vs. Roth TSP: the contribution allocation decision

Contribution limits are the same for Traditional and Roth TSP. The question is which bucket your dollars go into — and the answer depends heavily on your FERS income stack in retirement versus your current tax rate.

The short version: because FERS employees retire with a pension that is mostly taxable, Social Security (up to 85% taxable), and TSP distributions (fully taxable if Traditional), the cumulative tax in retirement is often higher than people expect. This pushes toward Roth contributions more than conventional wisdom suggests — especially in your 40s and early 50s before your income peaks. The mandatory Roth catch-up for high earners above $150K in 2025 wages codifies this logic directly into law for those in the highest tiers.

For a detailed analysis of the FERS income stack, 2026 tax brackets, and when Traditional beats Roth (and vice versa), see our dedicated guide: Roth TSP vs. Traditional TSP: The Federal Employee's Decision Guide.

What to do this year: a contribution checklist

1. Verify you're contributing at least 5%. Log into tsp.gov or MyPay and confirm your election. If you're below 5%, raise it — every dollar you're short of the 5% match threshold is leaving free money behind.
2. Switch to a percentage-of-pay election if you're a high earner. Flat dollar elections can trigger the early-limit trap. Use the formula: annual contribution target ÷ annual basic pay = contribution percentage.
3. If you're 60–63, verify you're capturing the super catch-up. Your election should be set to the $35,750 total ($24,500 + $11,250). The spillover method handles the bifurcation automatically, but you need to have catch-up contributions enabled.
4. Check your 2025 W-2 Box 3 wages if you're near $150,000. If you exceeded the threshold, your 2026 catch-up contributions are mandatorily Roth. Confirm your payroll office is routing them correctly.
5. Verify your 3-year vesting date if you've been a federal employee fewer than 3 years and have any plans to leave.

Why TSP maximization matters for FERS retirement income

The FERS three-legged stool — pension, TSP, Social Security — has an asymmetry most federal employees don't fully appreciate. The pension amount is largely fixed by your High-3 and years of service formula. Social Security is fixed by your earnings record and claiming age. TSP is the only leg you actively control during your career.

A GS-13 with 30 years of service retires with roughly $42,000–$50,000/year in FERS pension (at the 1% multiplier) plus whatever TSP they've built. The difference between consistently contributing 5% versus 15% over a 25-year career is often $400,000–$800,000 in TSP balance at retirement — directly proportional to whether you retire with income flexibility or income anxiety.

The contribution limit decisions you make during your career are not reversible. Years in which you under-contributed cannot be topped up later. The super catch-up at 60–63 is the only legal mechanism to partially compensate, but it only partially bridges the gap. The right time to maximize is every year you can.

1. 2026 TSP contribution limits: $24,500 elective deferral (IRC §402(g)); $8,000 standard catch-up (age 50+); $11,250 super catch-up (ages 60–63, SECURE 2.0 §109); FERS agency matching formula (1% automatic + up to 4% matching on first 5% employee contribution): TSP Bulletin 25-3 — 2026 Contribution Limits (tsp.gov); TSP — Contribution Types (tsp.gov).
2. TSP spillover method — since 2020, traditional contributions automatically spill over to catch-up contributions for age-eligible participants once the regular §402(g) limit is reached; agency matching suspension if regular limit is reached before final pay date: TSP Bulletin 25-3; IBC — 2026 TSP Contribution Limits (ibc.doi.gov).
3. SECURE 2.0 §603 mandatory Roth catch-up for participants with prior-year FICA wages exceeding $150,000 (2026 threshold; adjusted for inflation from the original $145,000); effective January 1, 2026; regular contributions up to $24,500 remain participant's choice: TSP Bulletin 25-3 — 2026 Limits; FEBA Benefits — 2026 Spillover Method & SECURE 2.0 Rules; MyFederalRetirement — Mandatory Roth Catch-Up Rules.
4. FERS Agency Automatic 1% vesting: 3-year cliff for most FERS participants; vesting schedule confirmed: TSP — Contribution Types (tsp.gov); OPM — FERS Information.
5. SECURE 2.0 §325 — no lifetime RMDs on Roth TSP balances starting 2024: SECURE 2.0 Act of 2022, Pub. L. 117-328.

Contribution limits verified as of April 2026 against TSP Bulletin 25-3 and IRS guidance. Limits adjust annually for cost-of-living increases; confirm current-year values at tsp.gov before making elections.