The mandatory Roth catch-up: Congress decided your catch-up dollars will be Roth, thank you very much

By Tom, CPA · Updated October 25, 2026

TL;DR: Starting in 2026, participants age 50+ in 401(k), 403(b) and governmental 457(b) plans whose prior-year FICA wages from the plan's sponsoring employer exceeded $150,000 (2025 wages) must make catch-up contributions as Roth. Final regulations generally apply from 2027, but plans must comply in 2026 using a reasonable, good-faith interpretation.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

Congress needed revenue for SECURE 2.0 and found it in a clever place: high earners' catch-up contributions. Instead of letting a 55-year-old executive deduct an extra $8,000 today, the law now makes those dollars Roth, so the Treasury collects tax now instead of decades later. It's the budget equivalent of asking guests to pay for dessert at the start of dinner.

The rule was originally supposed to start in 2024. Payroll systems panicked, the IRS granted a two-year administrative transition, and 2026 is the first year it's actually in force. Here's who is affected, how the wage test works, and what planners are doing about it.

CPA Warning Label: As of Oct 2026, plans are implementing this rule in different ways. If your plan has no Roth option, affected high earners may be unable to make catch-up contributions at all.

Who is affected

The rule (SECURE 2.0 section 603, added to Code section 414(v)) applies to:

• Participants who are eligible to make catch-ups (age 50 or older by year-end),
• In a 401(k), 403(b) or governmental 457(b) plan,
• Whose FICA wages (Social Security wages, W-2 box 3) from the employer sponsoring the plan exceeded the threshold in the prior calendar year.

It doesn't apply to IRAs or to SIMPLE IRAs and SEPs, which aren't covered by this requirement. It only changes the tax character of the catch-up; your regular $24,500 deferral can still be pre-tax.

The wage threshold

The threshold is $145,000, indexed. For 2026 catch-ups, the test is whether your 2025 FICA wages from the employer exceeded $150,000, per IRS Notice 2025-67. Key details:

• Per employer. Wages from a different employer don't count. Someone who changed jobs in 2026 had no 2025 wages from the new employer, so the rule generally doesn't apply in their first year there.
• FICA wages, not total compensation. Box 3 wages are capped at the Social Security wage base, but the threshold is far below that cap, so it's effectively wages above $150,000.
• Self-employed people with no FICA wages (for example, a sole proprietor's solo 401(k)) aren't subject to the rule, because they have self-employment income rather than FICA wages.
• Box 3 vs box 1. Pre-tax 401(k) deferrals reduce box 1 but not box 3. You can't defer your way under the threshold.

Effective date and final regulations

• Notice 2023-62 created an administrative transition period through December 31, 2025.
• On September 15, 2025, Treasury and the IRS issued final regulations (IR-2025-91).
• The Roth catch-up provisions in the final regulations generally apply to contributions in taxable years beginning after December 31, 2026, with later dates for some governmental and collectively bargained plans.
• For 2026, plans must apply the statute using a reasonable, good-faith interpretation; the final regulations didn't extend the transition period.

The final regulations let plans use a "deemed Roth election," treating an affected participant's catch-up as Roth automatically, and they describe correction methods when pre-tax catch-ups slip through by mistake (such as moving the amounts to Roth and reporting them on a W-2). As of Oct 2026, expect differences between plans in how they handle elections and corrections.

Plans without a Roth option

If the plan doesn't offer Roth deferrals, it can't accept catch-ups from affected employees. The rule doesn't force plans to add Roth, but a plan that offers catch-ups to anyone must allow Roth catch-ups for affected employees or eliminate catch-ups for them. Many sponsors added a Roth feature in 2025 and 2026 for this reason. Check your plan's summary or enrollment site. If Roth isn't offered and you're affected, your catch-up room may simply be zero this year.

Illustration: the tax trade-off

Illustration (assumptions): Larry, 56, earned $210,000 of FICA wages from his employer in 2025. In 2026 he defers $24,500 pre-tax plus an $8,000 catch-up, which must be Roth. His marginal federal rate is 32%.

• Before the rule: $32,500 pre-tax, saving about $10,400 of federal tax now.
• Under the rule: $24,500 pre-tax plus $8,000 Roth, saving about $7,840 now. The extra tax is about $2,560.
• Later: the $8,000 Roth grows tax-free. At a hypothetical 6% for 10 years, it's about $14,300, with no tax at withdrawal if the Roth rules are met.

If Larry expects his retirement tax rate to be far lower than 32%, he'd rather have the pre-tax deduction. If he expects to have large pre-tax balances and RMDs, the forced Roth money might be a blessing in disguise: tax diversification he wouldn't have picked himself.

Fran, 61, earned $150,000 exactly in 2025. The test is "more than" $150,000, so she isn't affected and can choose pre-tax for her $11,250 super catch-up.

Planning implications

• Budget the extra tax. Roth catch-ups raise taxable wages, so take-home pay drops a bit compared with pre-tax deferrals.
• Offset elsewhere. Some households shift other savings to pre-tax: for example, maxing an HSA ($4,400 self-only or $8,750 family in 2026) or using a deductible traditional IRA for a non-covered spouse.
• Reconsider the conversion plan. If you were planning Roth conversions in early retirement, forced Roth catch-ups now slightly reduce future pre-tax balances, which might mean smaller conversions later.
• Job changers: in your first year with a new employer, you had no prior-year wages there, so catch-ups can usually be pre-tax.
• Deferred compensation: nonqualified deferrals aren't catch-ups and aren't affected, though they have their own risks; see deferred compensation plans.

Does Roth even matter for early retirees?

A little Roth money goes a long way in early retirement. Roth 401(k) dollars can be rolled into a Roth IRA, and the Roth IRA's five-year clock and ordering rules then apply. Contributions rolled from a Roth 401(k) count as contributions in the Roth IRA, which can be withdrawn tax- and penalty-free. That makes forced Roth catch-ups surprisingly useful bridge money for a 50-something planning to retire before 59½.

A checklist for affected participants

1. Find your prior-year box 3. Look at last year's W-2 from your current employer. Over $150,000 for 2026 contributions means the rule applies.
2. Confirm the plan's approach. Does it automatically treat your catch-ups as Roth (the deemed election), or do you need to make a separate Roth catch-up election? Can you still reach the full catch-up?
3. Adjust withholding. Roth catch-ups are taxable wages. If you were counting on the deduction, update your W-4 or estimated payments.
4. Look at the super catch-up. At ages 60 to 63, the larger $11,250 catch-up must also be Roth if you're affected. See the super catch-up guide.
5. Check your pay stub in the first months to confirm catch-up dollars are landing in the Roth bucket. Mistakes are correctable, but it is easier to catch them early.
6. Track Roth basis. Keep year-end statements showing Roth contributions in the plan; they matter later when you roll to a Roth IRA.

If your wages hover near the threshold, remember the test is backward-looking. A big 2026 bonus or a lump sum of stock compensation reported as wages could push 2026 box 3 wages over the line and make your 2027 catch-ups Roth.

Common mistakes

• Assuming the rule depends on total household income. It's your wages from that employer.
• Thinking pre-tax deferrals or a cafeteria plan can push box 3 wages under the threshold.
• Forgetting that the threshold looks back one year, so a big 2026 bonus affects 2027.
• Expecting your IRA catch-up to be affected. It isn't.