A rule change tucked into the SECURE 2.0 Act, originally scheduled to take effect in 2024, delayed twice, and finally implemented under final IRS regulations, is now live: starting January 1, 2026, some 401(k) participants over 50 can no longer choose to make catch-up contributions pre-tax. If your prior-year wages crossed a specific threshold, every dollar of catch-up money now goes in after-tax, as Roth, whether you want it that way or not. This is a mandate on the account type, not a suggestion, and it changes the near-term math for anyone affected.
Here's exactly who it hits, what the numbers look like, and what to check with your plan before year-end.
Who's actually affected
The rule applies to anyone age 50 or older making catch-up contributions to a 401(k), 403(b), or governmental 457(b) plan, whose FICA wages from that specific employer exceeded $150,000 in the prior calendar year. For 2026, that means wages above $150,000 in 2025 (IRS-announced inflation-adjusted threshold; the original statutory figure was $145,000, indexed upward). The threshold is per employer, based on that single employer's FICA wages, not your combined household income or wages across multiple jobs.
If you're under the threshold, nothing changes: you can still choose pre-tax catch-up contributions as before. If you're over it, every catch-up dollar for 2026 must go in as Roth, meaning after-tax, with tax-free qualified withdrawals in retirement instead of a current-year deduction.
The dollar amounts for 2026
The regular 401(k) employee deferral limit for 2026 is $24,500. The standard catch-up contribution for those 50 and older adds $8,000 on top of that, for a total of $32,500 (IRS 2026 retirement plan contribution limits). Participants who turn 60, 61, 62, or 63 during the year get an enhanced "super catch-up" limit of $11,250 instead of $8,000, under a separate SECURE 2.0 provision, bringing their total to $35,750.
None of these limits changed because of the Roth mandate. What changed is only the tax treatment of the catch-up portion for people above the wage threshold: the $8,000 (or $11,250) still goes in, it just goes in as Roth instead of pre-tax if your prior-year wages crossed $150,000.
What this actually costs you this year
The practical effect is a reduction in your current-year tax deduction, not a reduction in how much you can save. Consider someone in the 32% marginal federal tax bracket making the full $8,000 catch-up contribution.
Under the old rules (pre-tax catch-up allowed): The $8,000 reduces taxable income directly, saving $2,560 in federal tax that year (32% × $8,000). The $8,000 grows tax-deferred, and withdrawals in retirement are taxed as ordinary income.
Under the new mandate (Roth catch-up required): The same $8,000 is contributed from after-tax pay, meaning no current-year deduction and no reduction in this year's tax bill. Assuming the same 32% bracket, funding the $8,000 Roth contribution from take-home pay effectively costs about $3,765 more in current-year cash flow than the pre-tax version would have (the $2,560 in tax that's no longer being saved, grossed up for the tax on the earnings used to fund it). In exchange, the $8,000 and all of its future growth come out completely tax-free in retirement, with no ordinary income tax owed on withdrawal.
Whether that trade is good or bad for you individually depends on whether you expect to be in a higher or lower tax bracket in retirement, the same question that drives any Roth-versus-pre-tax decision, except here it's no longer a choice for people above the threshold.
What happens if your plan doesn't offer a Roth option
This is the part catching plan sponsors and participants off guard. If your 401(k) plan doesn't have a Roth contribution feature at all, and many smaller employer plans still don't, affected high earners lose the ability to make catch-up contributions entirely, not just the pre-tax version of them. The IRS's final regulations confirmed that a plan without a Roth option simply can't offer catch-up contributions to participants over the wage threshold; their catch-up limit is effectively zero until the plan adds a Roth feature.
Some employers have adopted what's called a deemed Roth election: a policy that automatically routes an affected participant's catch-up contributions to Roth once they exceed the regular deferral limit, without requiring the participant to actively elect it. If your plan hasn't communicated how it's handling this, that's worth asking your HR or benefits contact directly, since the answer determines whether your catch-up contributions are even possible this year, let alone what tax treatment they get.
What you can and can't do about it
You can't opt back into pre-tax catch-up contributions if you're over the threshold. A plan is barred from letting a high earner choose pre-tax catch-up treatment once the mandate applies to them; the final regulations are explicit that plans can't offer that choice selectively.
You can check whether your plan has implemented the Roth option at all. If it hasn't, your options are limited to the regular deferral limit ($24,500 for 2026), with catch-up contributions on hold until the plan catches up, or making catch-up contributions to an IRA instead, subject to IRA contribution limits and income-based deduction rules, which are much lower than a 401(k) catch-up amount.
You can plan your cash flow around the after-tax cost. Since the Roth catch-up contribution no longer reduces your current-year taxable income, your take-home pay drops by the full contribution amount rather than the after-tax equivalent. Budgeting for that difference before the plan year starts avoids a surprise in your paycheck.
You can weigh whether the Roth treatment is actually a net positive for your situation, the same evaluation used elsewhere for Roth conversion decisions: tax-free growth and withdrawals are valuable if you expect a similar or higher tax rate in retirement, and less valuable if you expect a meaningfully lower one.
Why this is happening now, not in 2024
SECURE 2.0 originally set this provision to take effect for tax years beginning after December 31, 2023. The IRS granted administrative transition relief pushing the effective date to 2026, giving payroll systems and plan administrators time to build the wage-tracking and Roth-routing infrastructure needed to comply. Final regulations were issued confirming the mechanics, the $150,000 wage threshold (indexed for inflation going forward), and the deemed Roth election option for plan sponsors. The 2026 effective date is now firm; there's no indication of a further delay.
Does this change whether you should max out your 401(k) at all
No, and this is worth separating clearly from the tax-treatment question. The mandate changes what type of account your catch-up dollars land in. It doesn't change the case for contributing them in the first place. An $8,000 Roth catch-up contribution still grows tax-free, still comes out tax-free in retirement, and still counts toward the same $32,500 total deferral limit that would otherwise reduce how much you could save. Skipping the catch-up contribution because you'd rather have avoided the Roth treatment gives up the tax-free growth entirely to save on a deduction you would have only deferred, not eliminated, under the old pre-tax rules.
The one place this genuinely interacts with a broader strategy is for high earners who also use a mega backdoor Roth through after-tax 401(k) contributions, where the plan allows it. That's a separate mechanism from the catch-up mandate, using a different contribution type (after-tax, non-Roth contributions above the $24,500 deferral limit, later converted to Roth), but both push more of a high earner's 401(k) savings toward Roth treatment in the same plan year. If your plan offers both, it's worth checking with a tax advisor how the 2 interact given your specific contribution room, since the combined effect on this year's take-home pay is larger than either one alone.
How to check where you actually stand
Most people won't know whether they're affected until their plan tells them, either through open enrollment materials, a payroll notice, or by checking how a recent catch-up contribution was actually coded on a pay stub. If you're 50 or older, earned more than $150,000 in FICA wages from your current employer last year, and plan to contribute above the standard $24,500 deferral limit this year, assume the mandate applies to you and confirm your plan has a working Roth catch-up option before you're relying on it late in the year.
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Create your free dashboardFrequently asked questions
Does the $150,000 threshold use my income from this year or last year?
Last year. The rule looks at FICA wages from the specific employer sponsoring the plan during the prior calendar year. For contributions made in 2026, that means your 2025 FICA wages from that employer determine whether the Roth mandate applies to your 2026 catch-up contributions.
What if I have wages from 2 different employers, each under $150,000?
The threshold is evaluated per employer, based on the FICA wages that specific employer paid you and reported, not your combined income across jobs. If you had 401(k)s with 2 different employers and each paid you under $150,000, the mandate wouldn't apply to either plan's catch-up contributions, even if your combined income across both exceeded the threshold.
Does this affect Roth 401(k) participants who were already making after-tax contributions?
No. If you were already directing your catch-up contributions to a Roth account voluntarily, this mandate doesn't change your experience; you're already doing what the rule now requires for high earners. It only forces a change for people who were previously making pre-tax catch-up contributions and are now above the wage threshold.
Are IRA catch-up contributions affected by this rule too?
No. The SECURE 2.0 Roth catch-up mandate applies specifically to employer-sponsored plans: 401(k), 403(b), and governmental 457(b) plans. Traditional and Roth IRA catch-up contribution rules for those 50 and older are unaffected by this provision.