TSP Catch-Up Contributions 2026: Roth Rule, Limits, and Key Changes from 2025

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TSP catch-up contributions are additional retirement savings amounts that federal employees aged 50 and older can contribute to the Thrift Savings Plan beyond the standard elective deferral limit. In 2026, the catch-up limit is $8,000 for participants ages 50 to 59 and ages 64+, and a higher "super catch-up" of $11,250 for participants ages 60 to 63, according to the Internal Revenue Service (IRS) annual cost-of-living adjustments.

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A major change from 2025 is that the SECURE 2.0 Act catch-up contributions rule for higher earners takes effect on January 1, 2026. Federal employees whose 2025 FICA wages exceed $150,000 must make any age-based catch-up contributions to the TSP on a Roth (after-tax) basis in 2026. Updated May 2026.

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This guide explains the 2026 TSP catch-up limit, the new Roth catch-up rule TSP under SECURE 2.0, the differences between traditional and Roth TSP catch-up contributions, and the practical steps you should take to stay compliant and grow your retirement savings.

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What Are TSP Catch-Up Contributions?

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TSP catch-up contributions are supplemental contributions to the Thrift Savings Plan, the federal government's tax-advantaged retirement savings program. They let participants age 50 and older save above the standard annual elective deferral limit set by the IRS.

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Congress created the provision because workers approaching retirement often need to accelerate savings in their final working years.

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If you're covered under FERS (Federal Employees Retirement System), catch-up contributions are a critical lever for closing retirement income gaps. FERS retirees rely on three income sources: the FERS annuity, Social Security, and the TSP.

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Of those three, the TSP is the only one you directly control in the years before retirement. Employees still covered under CSRS (Civil Service Retirement System) don't receive matching contributions, but they can still use the TSP, including catch-up contributions, to build supplemental savings.

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According to the Federal Retirement Thrift Investment Board (FRTIB), which administers the TSP, catch-up contributions automatically count toward your regular TSP election once the standard limit is reached. You no longer file a separate catch-up election form. FRTIB implemented this process change in 2021.

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TSP Contribution Limits 2026: The Complete Picture

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The IRS announced the 2026 retirement plan contribution limits in IRS Notice 2025-67. The standard elective deferral limit for the TSP rose to $24,500 in 2026, up from $23,500 in 2025.

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The TSP catch-up limit for participants age 50 and older is $8,000. The TSP super catch-up for ages 60 to 63 is $11,250, according to the IRS.

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Here is how the TSP contribution limits 2026 stack for different age groups:

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Source: IRS Notice 2025-67 and Federal Retirement Thrift Investment Board guidance, 2026 plan year.

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Two notes you should mark carefully. The super catch-up for ages 60 to 63 is a SECURE 2.0 provision that first took effect in 2025, so 2026 is its second plan year.

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Also, participants who turn 64 in 2026 revert to the standard $8,000 catch-up. The higher amount applies only during the four-year window of ages 60, 61, 62, and 63.

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TSP Catch-Up 2025 vs 2026: What Changed

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The shift from 2025 to 2026 involves both routine inflation adjustments and one significant regulatory change. Here is a direct comparison:

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Source: IRS Notice 2024-80 (2025 limits), IRS Notice 2025-67 (2026 limits), and the SECURE 2.0 Act of 2022.

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The headline change is the activation of the mandatory Roth catch-up rule. The IRS originally scheduled it for 2024, then delayed it to 2026 to give plans time to implement.

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The standard limit rose by $1,000. The 2026 TSP catch-up limit rose by $500. The super catch-up amount for ages 60 to 63 didn't change for 2026, because SECURE 2.0 indexes that figure to inflation under a separate formula.

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The TSP High Income Catch-Up Rule (Roth Catch-Up Rule TSP)

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The TSP high income catch-up rule is a SECURE 2.0 Act provision. It requires participants whose prior-year FICA wages exceeded $150,000 to make their age-based catch-up contributions on a Roth basis.

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In plain terms: if you earned more than $150,000 from your federal employer in 2025, every dollar of your 2026 age-based TSP catch-up must go into the Roth TSP, not the traditional (pre-tax) TSP. Your regular employee deferrals up to the $24,500 standard limit can still go to either Roth or traditional, as you prefer.

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According to the Internal Revenue Service, Section 603 of the SECURE 2.0 Act of 2022 created this provision. It applies to all qualified employer-sponsored plans, including the TSP.

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The $150,000 threshold was indexed up from $145,000 under IRS Notice 2025-67. It's measured strictly from FICA wages (Box 3 of your W-2) reported by your current employer, not from spouse income, investment income, or wages from a prior employer in that same year.

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A few specific scenarios worth understanding:

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• Switched agencies mid-year. Wages from each federal employer are counted separately. An employee who earned $95,000 at one agency and $85,000 at another in 2025 isn't subject to the Roth catch-up rule in 2026, even though combined wages exceeded $150,000.

• New federal hires. If you have no FICA wages from the same employer in the prior year, the rule doesn't apply to you.

• CSRS participants. CSRS employees who don't pay full FICA tax (Old-Age, Survivors, and Disability Insurance, or OASDI) on their federal wages are generally exempt, according to FRTIB implementation guidance. CSRS-Offset employees should consult with their agency benefits officer, because their FICA treatment differs.

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If you're subject to the rule and your TSP election is set for traditional catch-up contributions, the TSP system will automatically reclassify those amounts as Roth once you exceed the standard limit. You won't lose the contributions, but you'll lose the upfront tax deduction you may have been expecting.

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Roth vs Traditional TSP Catch-Up: Which Should You Choose?

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If you're not subject to the mandatory Roth catch-up rule, the choice between Roth TSP catch-up contributions and traditional TSP catch-up contributions is one of the most consequential tax decisions in retirement planning. The core question: do you want the tax break now (traditional) or in retirement (Roth)?

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Traditional TSP catch-up contributions reduce your current taxable income, lowering your federal tax bill in the year you contribute. Withdrawals in retirement are taxed as ordinary income.

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Roth TSP catch-up contributions are made with after-tax dollars. Qualified withdrawals in retirement, including all investment growth, are completely tax-free, provided you're at least 59½ and the Roth account has been open at least five years.

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Here is a side-by-side comparison:

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Source: Internal Revenue Code §§402A and 414(v); FRTIB Roth TSP guidance, 2026.

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One often-overlooked factor: qualified Roth TSP withdrawals don't increase your taxable income in retirement. That can support broader tax planning goals such as managing Medicare IRMAA brackets and the taxation of Social Security benefits.

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The FERS Special Retirement Supplement, or SRS, is the payment that bridges the gap between MRA (Minimum Retirement Age) and Social Security eligibility at age 62. Its earnings test uses earned income from wages or self-employment, not TSP withdrawals or Adjusted Gross Income (AGI) broadly, according to OPM (U.S. Office of Personnel Management).

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Coordinating Roth versus traditional TSP withdrawals with other retirement income sources is a planning angle that Federal Pension Advisors, a retirement planning firm specializing in federal employee benefits, regularly highlights when reviewing client portfolios in the five years preceding retirement.

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How to Set Up TSP Catch-Up Contributions in 2026

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The catch-up election process is now fully integrated into your standard TSP contribution election. There's no separate form. You make changes through your agency payroll system, typically Employee Express, MyPay, or EBIS, depending on the agency.

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The general process:

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• Confirm your eligibility. You must be turning 50 or older at any point in the calendar year 2026.

• Calculate your per-pay-period contribution. Divide your target annual amount (standard limit + applicable catch-up) by the number of pay periods remaining in 2026.

• Update your TSP election in your agency payroll system. Enter either a dollar amount or a percentage of basic pay.

• Designate Roth or traditional, or split between the two, for each portion of your contribution. If you're subject to the high-income Roth catch-up rule, the system will enforce the Roth requirement once you exceed the standard limit.

• Verify your first pay statement after the change to confirm the deduction matches your intended amount.

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According to FRTIB guidance, the TSP allows participants to "spillover" excess contributions seamlessly. Once you exceed the $24,500 standard limit, additional contributions automatically count toward your catch-up. You no longer need a separate election to start them.

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Key Planning Considerations for 2026

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Hitting the highest possible dollar figure isn't the only goal in 2026. The real work is coordinating those contributions with the rest of your federal retirement picture: your FERS annuity, FEHB premiums in retirement, your Social Security claiming strategy, and your overall tax situation.

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Each of these decisions can affect retirement income, tax liability, and monthly cash flow. The choices interact with one another in ways that are difficult to reverse after retirement.

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If you're a high-income earner newly subject to the Roth catch-up rule, 2026 is also a year to revisit broader tax planning. The loss of a deduction on $8,000 to $11,250 of contributions may change your estimated tax payments, your withholding strategy, or your decision to convert other pre-tax accounts to Roth.

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Federal Pension Advisors, a retirement planning firm specializing in federal employee benefits, recommends that affected employees review their full benefit picture before the first pay period of the calendar year, when contribution elections take effect.

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Next Steps

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The 2026 plan year brings a major structural change to TSP catch-up contributions, especially for higher-earning federal employees affected by the new Roth catch-up rule. If you're age 50 or older, and especially if your 2025 FICA wages exceed $150,000, review your elections before the first pay period of January 2026. That ensures your contributions reflect both the new limits and the mandatory Roth treatment where applicable.

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Federal Pension Advisors, a retirement planning firm specializing in federal employee benefits, helps federal employees coordinate TSP elections with the full FERS benefit picture. That includes the FERS annuity, the FERS Special Retirement Supplement, Social Security claiming, and FEHB premiums in retirement.

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Review the federal retirement checklist to see how your 2026 TSP catch-up strategy fits within your broader federal retirement plan, and contact our team if you'd like a specialist to walk through your elections with you.

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Frequently Asked Questions

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1. When can I start making TSP catch-up contributions?

You can begin TSP catch-up contributions in the calendar year you turn 50, even if your birthday is in December. According to FRTIB rules, catch-up eligibility is based on the full calendar year, not the day of your birthday. You can elect catch-up contributions during your first eligible pay period in January.

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2. How much can I contribute to the TSP in 2026?

In 2026, federal employees under age 50 can contribute up to $24,500 to the TSP. Those age 50 to 59 or 64 and older can add $8,000 in catch-up contributions, for a total of $32,500. Participants ages 60 to 63 can use the super catch-up of $11,250, allowing total contributions of $35,750, according to IRS guidance.

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3. What is the Roth catch-up rule for high earners?

Section 603 of the SECURE 2.0 Act created the Roth catch-up rule. It requires federal employees whose prior-year FICA wages exceeded $150,000 to make their age-based catch-up contributions on a Roth (after-tax) basis starting in 2026. The rule applies per employer and uses the wage figure from Box 3 of your prior-year W-2.

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4. Do I have to make a separate catch-up election?

No. Since 2021, the TSP has integrated catch-up contributions into the standard election. According to the Federal Retirement Thrift Investment Board, once your contributions exceed the $24,500 elective deferral limit in 2026, additional amounts automatically count toward your catch-up limit. You only need to set a single contribution amount large enough to reach both limits.

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5. Can I split my catch-up between Roth and traditional TSP?

Yes, unless you're subject to the high-income Roth catch-up rule. If the $150,000 wage threshold doesn't apply to you, you can allocate any combination of Roth and traditional contributions, including your catch-up amounts. The TSP system tracks each contribution type separately throughout the year, according to FRTIB participant guidance.

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6. What happens if I contribute too much to the TSP?

If you exceed the IRS combined limit, $32,500 for ages 50 to 59 or $35,750 for ages 60 to 63 in 2026, the excess must be removed by April 15 of the following year to avoid double taxation. According to the IRS, excess deferrals that aren't withdrawn on time are taxed both in the year contributed and the year distributed. Contact your agency payroll office immediately if you identify an over-contribution.

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Disclaimer

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This article is for educational purposes only and should not be treated as tax, legal, or financial advice. TSP contribution limits, Roth catch-up rules, IRS guidance, and federal benefits rules can change. Federal employees should confirm current limits with the IRS, TSP, OPM, or their agency benefits office before making contribution elections. Consult a qualified financial or tax professional before changing your TSP strategy.

This fits the article because it discusses TSP elections, Roth tax treatment, FERS benefits, IRS limits, and retirement planning decisions.

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