A long-delayed provision of the SECURE 2.0 Act took effect on January 1, 2026, and it is quietly reshaping how older, higher-income workers save for retirement. If you are age 50 or older and earned more than $150,000 in FICA wages in 2025, your 401(k) catch-up contributions in 2026 must now be made on a Roth (after-tax) basis — not pre-tax. For workers who have spent decades maximizing pre-tax deferrals, the change is significant and worth understanding before your next paycheck.
What Actually Changed
The IRS confirmed in its 2026 guidance that the 401(k) elective deferral limit rises to $24,500, with an $8,000 catch-up available to workers age 50 and older — bringing the total possible contribution to $32,500 for the year. That math has not changed.
What has changed is the tax treatment of the catch-up portion for one specific group: participants whose prior-year Social Security (FICA) wages from the same employer exceeded $150,000. Beginning with the 2026 plan year, those workers must designate their catch-up dollars as Roth contributions. Any pre-tax catch-up election on file must be redirected.
Who Is — and Isn't — Affected
The rule is narrower than many headlines suggest. To be subject to the mandate, you must:
- Be age 50 or older by December 31, 2026
- Have earned more than $150,000 in FICA wages in 2025 from the employer sponsoring the plan
- Want to contribute above the standard $24,500 elective deferral limit
Workers who earned $150,000 or less in 2025 retain full flexibility to make catch-up contributions as either pre-tax or Roth. Self-employed individuals and those whose compensation is not reported as FICA wages (such as certain partners) fall outside the rule entirely.
Fidelity notes that participants should check Box 3 of their 2025 Form W-2 to confirm whether they cross the wage threshold.
Why Congress Designed It This Way
The Roth catch-up mandate was part of a broader SECURE 2.0 package aimed at shifting future tax revenue forward. Pre-tax contributions reduce current taxable income; Roth contributions don't. By funneling catch-up savings from high earners into Roth accounts, the Treasury collects taxes today rather than decades from now — while workers get tax-free growth and tax-free qualified distributions in retirement.
For savers, that tradeoff can actually be favorable. Roth dollars do not trigger required minimum distributions during the owner's lifetime, and qualified withdrawals do not increase taxable income that could raise Medicare premiums or push Social Security benefits into higher tax brackets.
Practical Steps to Take Now
- Confirm your wage status. Pull your 2025 W-2 and verify your FICA wages. If you crossed $150,000 with a single employer, the rule applies for 2026.
- Check your plan's Roth feature. If your employer's 401(k) does not offer a Roth option, the IRS has clarified that high earners in that plan simply cannot make catch-up contributions until the plan is amended. Ask HR.
- Update your deferral election. Split elections may be required — pre-tax up to $24,500, then Roth for the $8,000 catch-up.
- Revisit your tax projection. Losing the pre-tax catch-up deduction can add roughly $2,500–$3,000 to your federal tax bill depending on bracket. Adjust withholding or estimated payments accordingly.
The Bigger Picture
For retirement-focused investors, the 2026 change is a reminder that the tax code rewards diversification across account types — not just across asset classes. Holding a mix of pre-tax, Roth, and taxable assets (and for some investors, a portion in precious metals IRAs) gives retirees flexibility to manage withdrawals around tax brackets, Medicare IRMAA thresholds, and changing legislation. The Roth catch-up mandate nudges high earners further in that direction whether they planned for it or not.
Sources: Internal Revenue Service (IRS), Fidelity Investments, Charles Schwab, Manulife John Hancock Retirement