TSP Catch-Up Contributions 2026: The Super Catch-Up Strategy for Federal Employees

If you're 50 or older, you can contribute up to $11,250 more to your TSP than younger colleagues in 2026. At ages 60–63, that number jumps even higher. This guide explains the three-tier catch-up system, the mandatory Roth catch-up rule for high earners, and how to calculate exactly what maximizing the window is worth at your retirement date.

The three-tier catch-up system in 2026

TSP catch-up contributions are additional elective deferrals above the standard $24,500 limit. SECURE 2.0 Act §109 created a temporary "super catch-up" for the four years immediately before Medicare eligibility.

How catch-up contributions interact with agency match

Agency matching covers your first 5% of basic pay per pay period — a 1% automatic contribution plus matching on up to 4% more. That matching formula runs on your base salary throughout the year and is separate from catch-up contributions.

Key rules:

• Catch-up contributions do not receive additional match. You already receive the full 5% employer contribution by contributing ≥5% of your basic pay each pay period. Catch-up amounts go on top of that ceiling and carry no additional employer match.
• Spreading contributions evenly protects your match. If you concentrate contributions early in the year and hit $24,500 before December, your payroll deductions may stop — and you'll lose matching for the remaining pay periods. This is the early-limit trap. Spreading evenly ensures every pay period captures the 5% match before shifting dollars to catch-up.
• The spillover rule is automatic. Once TSP records your contributions past $24,500, additional amounts automatically count against the catch-up limit. You don't need to elect catch-up separately — but you do need your agency's payroll system to continue deducting past the regular limit.

Mandatory Roth catch-up for high earners

Under SECURE 2.0 §603, federal employees with prior-year FICA wages above $150,000 must make catch-up contributions on a Roth (after-tax) basis — they cannot make pre-tax catch-up contributions. For 2026 contributions, the threshold applies if your 2025 FICA wages exceeded $150,000.¹

What this means in practice:

• If your 2025 FICA wages were ≤$150,000: your catch-up contributions can be traditional (pre-tax) or Roth — your choice.
• If your 2025 FICA wages were >$150,000: once you've contributed the full $24,500 traditional, any additional catch-up must go to Roth TSP. Your payroll office handles the routing once you've hit the traditional maximum.
• FICA wages include base salary and locality pay. For GS-15 employees in major metropolitan areas, this threshold is commonly crossed.
• The mandatory Roth catch-up is not necessarily bad — if you're in a higher bracket now than you expect to be in retirement, the forced Roth treatment may actually benefit you.

Interactive catch-up impact calculator

Assumes contributions made at year-end; agency match at 5% of basic pay; flat annual return. Illustrative only — not tax or investment advice.

Career-stage strategy guide

Ages 50–59: Standard catch-up ($8,000 extra)

This is your first catch-up window. If you haven't been maximizing TSP contributions throughout your career — common for federal employees who prioritized mortgage payoff, education costs, or defined-benefit pension thinking — the 50s are where you make up ground. Even if you can only partially close the gap, every dollar of catch-up compounds tax-deferred until withdrawal.

Priority at this stage: make sure you're contributing at least 5% of basic pay every pay period (to capture the full agency match) before adding catch-up dollars above the regular limit.

Ages 60–63: Super catch-up ($11,250 extra) — the critical window

SECURE 2.0's super catch-up is specifically designed for this four-year window. At 60–63 you can contribute $35,750 annually — $11,250 more than someone one year younger or older.

This window overlaps with three important FERS planning dynamics:

1. FERS supplement income phase: If you retire at your MRA with 30+ years, the FERS supplement fills the gap to age 62. That income is fully taxable — meaning your marginal bracket during the supplement period affects your Roth conversion math.
2. Pre-Medicare IRMAA window: Any Roth conversions done before age 63 won't appear in Medicare's IRMAA two-year lookback until ages 65+. Converting traditional TSP to Roth TSP during ages 60–63 can reduce future RMDs and Medicare surcharges simultaneously.
3. The Roth catch-up decision: If you're below the $150K FICA wage threshold, you choose whether super catch-up dollars go to traditional or Roth. Most federal employees in their early 60s who plan to do in-plan Roth conversions should contribute catch-up traditionally (lower current-year taxes) and convert strategically afterward. High earners above $150K will be forced to Roth — which may still be the right answer long-term.

Age 64+: Back to standard catch-up ($8,000 extra)

The super catch-up ends at 64. You revert to the standard $8,000 catch-up. If you're continuing to work past 63, maintain the full $32,500 annual contribution if you can. Also note: if you're still working, the "still-employed exception" defers TSP RMDs past age 73/75 — so continued contributions at 64+ may be highly effective for deferring tax even on a large balance.

Mandatory Roth catch-up: Who it affects and what to do

If your 2025 FICA wages exceeded $150,000, your 2026 catch-up contributions must be Roth. Your payroll office routes this automatically once you've hit the $24,500 traditional maximum. A few considerations:

• This isn't necessarily bad. Many GS-15 / SES employees in their 60s are planning significant Roth conversions anyway. Being forced into Roth catch-up accelerates the Roth balance you'll need post-retirement.
• Check your payroll system. Some agencies' HR/payroll systems need configuration to handle the spillover correctly. If you expect to be affected, confirm with your HR office before year-start that catch-up contributions will route correctly after you hit $24,500.
• Traditional TSP is still available up to $24,500. The mandate is only on catch-up amounts above the regular limit. Your first $24,500 of contributions can still be traditional TSP regardless of income.

5 common catch-up mistakes

1. Front-loading and losing agency match. Contributing heavily in early pay periods to hit the regular limit quickly stops TSP deductions — and stops matching — for the remaining pay periods. Spread contributions evenly across all 26 pay periods.
2. Assuming catch-up contributions earn match. Catch-up contributions above $24,500 don't receive agency matching. Your employer's contribution is locked at 5% of basic pay, which gets used up on the first $24,500 of your contributions (assuming you contribute ≥5% of salary all year).
3. Missing the 60–63 super catch-up window. Many federal employees don't know about SECURE 2.0's elevated limit at 60–63. The $3,250 extra per year versus the standard catch-up compounds to a material difference at a 7% return over a 3-year window.
4. Thinking catch-up doesn't matter with a FERS pension. The pension provides a floor, not a ceiling. The TSP is what allows flexible spending, Roth conversion strategies, RMD management, and estate assets. Even a $100K pension doesn't eliminate the value of a larger TSP balance.
5. Not planning for the mandatory Roth catch-up shift. High earners who've made traditional contributions their entire career can face an unexpected tax strategy disruption when the Roth mandate kicks in. Model this in advance rather than discovering it mid-year.

Catch-up contributions and the TSP in-plan Roth conversion

As of January 28, 2026, TSP offers in-plan Roth conversions — you can convert traditional TSP balances directly to Roth TSP without leaving the account. This changes the optimal catch-up strategy for many employees:

• If you're in a moderate bracket now: contribute catch-up traditionally (reduce current taxes), then convert to Roth in low-income years (supplement gap, early retirement before SS).
• If you're near or above $150K FICA wages: mandatory Roth catch-up is required anyway; in-plan conversions become a tool for converting the traditional balance accumulated before the mandate.
• Each in-plan conversion starts its own 5-year clock for tax-free growth, so converting at 60–61 means the conversion is fully qualified by ages 65–66 — well before most distributions begin.

Sources — values verified June 2026

1. TSP Bulletin 25-3: 2026 TSP Contribution Limits — elective deferral $24,500; standard catch-up $8,000; super catch-up $11,250 (ages 60–63); mandatory Roth catch-up threshold $150,000
2. IRS: 401(k) and Retirement Plan Limit Increases for 2026 — confirms $24,500 elective deferral limit and $8,000 catch-up
3. IRS: Retirement Topics — Catch-Up Contributions — SECURE 2.0 §109 super catch-up rules and §603 mandatory Roth catch-up
4. IRS: Final Regulations on SECURE 2.0 Roth Catch-Up Rule — §603 final regs, $150,000 FICA wage threshold