TSP Roth Catch-Up Hits: The $150K Trip Line
SECURE 2.0 now forces Roth catch-up for federal civilians with 2025 Medicare wages above $150,000. VB locality pay trips GS-14 step 6 into the rule.
As of January 1, 2026, federal civilians age 50 and older who earned more than $150,000 in 2025 Medicare wages can no longer put their Thrift Savings Plan catch-up contributions into the traditional (pre-tax) bucket. All catch-up contributions for that population must now be Roth. This is the SECURE 2.0 Act § 603 mandate, and it is in effect, per the TSP’s SECURE 2.0 summary.
In our view, this is the single biggest plan-mechanics change for high-earning federal civilians in 2026, and it hits the GS-13, GS-14, and GS-15 population disproportionately. If you are a NAVSEA Norfolk Naval Shipyard engineer, a NASA Langley civil servant, a NAVFAC project manager, a VA Medical senior physician, or a Coast Guard Atlantic senior officer, this rule likely applies to you.
We believe the right way to think about this change is not as a penalty, but as a planning constraint. The mandate removes one election choice and forces a different one. Whether that is net positive or negative for any individual depends on bracket expectations at retirement, state of residence, and how large the existing pre-tax TSP balance already is.
Educational disclaimer: Ferrante Capital LLC is not affiliated with, endorsed by, or sponsored by the U.S. Government, DoD, Navy, NAVSEA, NAVFAC, NASA, VA, or any federal agency. This content is educational. Election decisions should be discussed with a qualified tax professional or your plan administrator.
What Changed on January 1
SECURE 2.0 § 603 requires that any participant whose prior-year FICA wages exceeded $150,000 and who wants to make catch-up contributions age 50+ must make those contributions on a Roth basis only. The pre-tax option is no longer available for that population.
Here is what that looks like in 2026 dollars, per the IRS 2026 contribution limits and TSP Bulletin 25-3.
| 2026 TSP Contribution | Amount | Notes |
|---|---|---|
| Elective deferral limit | $24,500 | Any TSP participant, any age |
| Age 50+ catch-up | $8,000 | Roth only if 2025 Medicare wages > $150K |
| Age 60-63 super catch-up (SECURE 2.0 § 109) | $11,250 | Roth only if 2025 Medicare wages > $150K |
| Section 415(c) total annual additions | $72,000 | Combined limit |
| Section 401(a)(17) compensation cap | $360,000 | Cap on wages considered |
The threshold looks at 2025 W-2 Box 5 Medicare wages and tips, per the Federal News Network explainer. That is the number your agency payroll transmits to TSP. There is no self-certification out. If your 2025 W-2 Box 5 was over $150,000, the rule applies.
Who Is Actually Affected
The $150,000 threshold sounds high, but Virginia Beach locality pay does much of the math for you. The 2026 VB locality adjustment runs 18.80% on top of GS base pay, per the OPM VB locality salary tables. Overtime, shift differential, and step pay push the W-2 higher.
Here is where the trip line sits against current VB locality rates. Numbers are rounded and illustrative. Check your own agency’s payroll output for the exact figures on your 2025 W-2.
| Grade and Step | GS Base (rounded) | VB Locality Adjustment (18.80%) | Effective Base W-2 | Above $150K Without OT? |
|---|---|---|---|---|
| GS-13 step 5 | ~$108,500 | ~$20,400 | ~$128,900 | No |
| GS-13 step 10 | ~$122,500 | ~$23,000 | ~$145,500 | Close; OT or awards may cross |
| GS-14 step 1 | ~$116,800 | ~$22,000 | ~$138,800 | No |
| GS-14 step 6 | ~$137,100 | ~$25,800 | ~$162,900 | Yes |
| GS-14 step 10 | ~$151,800 | ~$28,500 | ~$180,300 | Yes |
| GS-15 step 1 | ~$137,400 | ~$25,800 | ~$163,200 | Yes |
| GS-15 step 10 | ~$178,900 | ~$33,600 | ~$212,500 | Yes |
GS-14 step 6 and above are likely over the threshold. GS-13s with overtime, shift differential, or awards often cross it as well. If you are inside a shipyard or on a vessel-availability schedule where OT is a recurring feature, you may already be above $150,000 even at mid-grade.
The Tax Cost in Plain Dollars
The Roth catch-up mandate is not free. Making an $8,000 contribution on a Roth basis rather than pre-tax costs you the current-year tax deduction on that $8,000.
Here is the reproducible math for a GS-14 in a 24% federal marginal bracket with no state tax reduction (Virginia, for this illustration):
- Roth $8,000 catch-up × 24% federal marginal = $1,920 in lost current-year federal deduction
- Add Virginia state income tax at an approximate 5.75% effective marginal rate: $8,000 × 5.75% = $460
- Combined current-year after-tax cost of using Roth instead of pre-tax: approximately $2,380
For a GS-15 or GS-14 step 10 in a 32% federal marginal bracket, the math is:
- Roth $8,000 catch-up × 32% federal = $2,560
- Virginia 5.75%: $460
- Combined: approximately $3,020
For a participant making the age 60-63 super catch-up of $11,250 at a 32% bracket:
- Roth $11,250 × 32% federal = $3,600
- Virginia 5.75%: $647
- Combined: approximately $4,247
This is not a reason to skip the catch-up. The long-run value of tax-free compounding in a Roth account typically exceeds the current-year deduction, especially for participants who expect meaningful retirement income and live in a no-income-tax state later. It is a reason to plan around it rather than default into it.
Why This Is Not Necessarily a Bad Thing
In our view, the Roth catch-up mandate creates a planning opportunity for federal civilians who were going to save aggressively anyway. Three reasons.
A Roth bucket is useful. Most federal civilians approach retirement with a TSP that is heavily pre-tax. Building a Roth bucket, even a small one, gives you optionality on required minimum distributions, IRMAA brackets, and state residency planning later. The mandate forces that diversification on participants who might not have elected it otherwise.
The pairing with the FERS Supplement years. If you are planning to retire at your Minimum Retirement Age (57 for anyone born 1970 or later) and draw the FERS Supplement until age 62, your taxable income during those bridge years is temporarily lower than it will be after Social Security and TSP distributions start. That window is well-suited for Roth conversions on the pre-tax balance. A growing Roth catch-up balance plus a pre-62 conversion strategy can build a meaningful Roth piece over five to ten years.
The flexibility at distribution. Roth balances do not carry RMDs during the original owner’s lifetime, per current law. Pre-tax TSP balances rolled into a traditional IRA do. If your retirement plan includes leaving money to heirs, Roth balances are generally more efficient.
What the Mandate Does Not Change
A few items are worth noting so the rule change is not misread as broader than it is.
CZTE combat-zone contributions. Uniformed service members who contribute to Roth TSP from tax-excluded combat-zone pay still have a separate treatment path. The $150K mandate is about FICA-wage civilians, not about CZTE contributions. See the TSP SECURE 2.0 page for the combat-zone specifics.
The automatic 1% agency contribution. FERS participants still receive the automatic 1% of base pay on top of any matching contributions. That does not change.
The 5% match on 5%. The full FERS match (1% auto + 100% on the first 3% + 50% on the next 2% = 5% at a 5% deferral) still applies. The mandate affects only the catch-up contribution bucket above the regular $24,500 elective deferral limit.
Participants under 50. The rule is only about catch-up contributions, which begin at age 50. If you are under 50, this rule does not apply to you at all.
Action Steps Before Your Next Pay Period
We believe every affected federal civilian should do three things in April or May 2026, with their tax preparer or fee-only advisor, before the next pay cycle.
- Pull your 2025 W-2 Box 5. That is the number that determines whether the rule applies. It is not your gross salary. It is Medicare wages, which may include OT, shift diff, awards, and other supplemental pay.
- Confirm with your agency HR or benefits office whether your catch-up election has been converted to Roth automatically. Most federal payroll systems implemented this in January 2026, but implementation timing varied.
- Decide whether to keep the catch-up contribution running. If you were doing it primarily for the pre-tax deduction, the calculus has changed. If you were doing it for long-term tax-free growth, the calculus is unchanged or improved.
If the Roth-only mandate pushes you to reconsider catch-up entirely, we think that is worth discussing with a qualified tax professional before you make the change. The long-run compounding math usually favors keeping the catch-up running, even on a Roth basis, especially for participants with 10 or more years of work ahead.
The rule is already in effect. The only variable left is how you respond to it.
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