For years, older savers could pick whether their extra 401(k) catch-up dollars went in pretax or Roth. That choice disappears for high earners in 2026. Under a long-delayed SECURE 2.0 provision now in force, employees whose prior-year wages from their plan sponsor exceeded $150,000 must make all catch-up contributions on a Roth, after-tax basis.
What Actually Changed
The catch-up dollar amounts are unchanged: $8,000 for ages 50 and up, or $11,250 for the super catch-up ages of 60 through 63. What changed is the tax treatment. High earners no longer get an upfront deduction on those catch-up dollars; instead the money is taxed now and grows tax-free.
- The trigger: more than $150,000 in FICA wages from the sponsoring employer in the prior year (2025 wages govern 2026).
- What counts: only wages from the plan sponsor, not household income or self-employment earnings.
- Fresh each year: the test is based on the immediately preceding year's W-2, so status can change annually.
The Hidden Risk: No Roth Source, No Catch-Up
If your plan does not offer a Roth 401(k) option and you are a mandated high earner, you may be blocked from making any catch-up contribution at all until the plan adds one. Confirm your plan has a designated Roth account before you count on the extra room.
Turning the Mandate Into an Advantage
Being forced into Roth is not purely a downside. Roth balances grow tax-free, avoid required minimum distributions during your lifetime under current rules, and can pass to heirs with favorable treatment. For savers who expect higher rates later or want tax diversification, the mandate quietly builds a valuable tax-free bucket.
Planning Moves for 2026
- Check your 2025 W-2 wages from the specific employer sponsoring your plan to see if you are captured.
- Adjust withholding, since losing the catch-up deduction slightly raises current taxable income.
- Consider offsetting the lost deduction elsewhere, such as HSA contributions or a spouse's pretax deferrals.
- If you switch employers mid-year, re-run the wage test against the new sponsor.
How the Numbers Play Out
Consider a 55-year-old earning $200,000 who makes an $8,000 catch-up. Under the old rules that $8,000 could be pretax, saving roughly a third of it in current taxes at higher brackets. Beginning in 2026 that deduction disappears; the $8,000 is taxed now but grows and withdraws tax-free later. The effective decision is whether you would rather pay tax on the seed or on the harvest, and for many high earners who expect substantial retirement income, paying tax now on a smaller amount is the better long-run trade.
- Model both scenarios before assuming the mandate hurts you.
- Use the forced Roth to balance a portfolio that is otherwise heavily pretax.
- Revisit the calculation each year, since the wage test resets annually.
Who Escapes the Rule
Workers at or below the $150,000 wage line keep full choice between pretax and Roth catch-ups. Self-employed savers using a solo 401(k) measure differently because the wage definition applies to W-2 pay. Because thresholds and plan features vary, confirm the details with your plan administrator and a tax professional before finalizing your 2026 elections.