A new provision that took effect on January 1, 2026, can quietly erase a valuable tax break for higher-paid workers without any change on their part. Anyone whose wages from an employer exceeded $150,000 in the prior year must now make their 401(k) catch-up contributions on a Roth, after-tax basis, and if that worker’s plan has never added a Roth option, the law bars the catch-up entirely. The stakes are the full $8,000 in extra retirement savings that workers 50 and older would otherwise shelter in 2026, wiped out not by a spending choice but by a feature their plan happens to lack.
How a saver loses the catch-up without changing a thing
The rule comes out of the SECURE 2.0 Act, which reclassified catch-up contributions for high earners as Roth-only. For a worker who clears the wage threshold, the ordinary pre-tax catch-up is simply no longer available; the money can go in only as after-tax Roth dollars. That is manageable when a plan already offers a Roth 401(k), because the affected saver just contributes to the Roth side and keeps the extra room, only with a different tax character.
The problem lands on workers whose employer plan has no designated Roth account at all. Because the law now requires the catch-up to be Roth for these earners, a plan without a Roth feature has no permitted place to put the money, so the affected worker cannot make the catch-up until the plan is amended. The contribution is not merely taxed differently; for that year, in that plan, it disappears as an option, which is what turns an administrative gap into a real loss of savings room.
The $150,000 line is drawn from a specific number. It is the FICA wages an employer reported on the worker’s prior-year Form W-2, so the 2026 test looks back at 2025 pay, and the figure is indexed to rise over time. Because the threshold is measured employer by employer, a person who changed jobs or whose pay straddles the line may fall in or out of the rule from one year to the next, and the catch-up rules the IRS publishes each year govern exactly who is swept in.
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Roth catch-up means tax now, tax-free later
For high earners whose plans do offer the Roth option, the change is a shift in tax timing rather than a loss of savings room. A pre-tax catch-up lowers taxable income in the year it is made, while a Roth catch-up is funded with after-tax dollars and generates no current deduction, in exchange for qualified withdrawals that come out tax-free in retirement. Someone in a high bracket during their peak earning years often values the immediate deduction most, which is exactly what this rule takes away, forcing the catch-up into the account that pays off later instead.
The mechanics are meant to run in the background. A plan that offers Roth can route a high earner’s catch-up dollars there automatically once the wage test is met, so the worker may not even notice the shift beyond a change in how the contribution is taxed on the paycheck. That smoothness is precisely why the workers most exposed are the ones whose plans cannot perform the redirect, because there is no Roth bucket for the money to fall into and the contribution stops instead.
The people most at risk sit in the 50-and-older band, earn comfortably above the line, and participate in a plan run by a smaller employer that never built a Roth feature. A 55-year-old earning $160,000 at such a company could find the entire $8,000 catch-up off the table for the year, a meaningful gap in the stretch when late savers are trying to close ground. Most large employers added Roth 401(k) accounts years ago, so the risk concentrates among smaller plans that have not kept pace with the law.
What affected workers can do before year-end
The first step is confirming whether the plan even offers a designated Roth 401(k), a detail buried in the summary plan description or answered quickly by a benefits administrator. If the answer is no, the workplace catch-up is unavailable for high earners this year, and the practical fallbacks live outside the plan. A traditional or Roth IRA opened separately carries its own contribution and catch-up room, subject to income rules, and a working spouse’s plan may offer a Roth option that the household can lean on instead.
Timing matters because the fix is not always in the worker’s hands. A plan sponsor can add a Roth feature, but doing so takes a plan amendment and payroll setup that may not happen mid-year, so a high earner who discovers the gap in the fall may simply be out of options for the current year. Raising the question with the employer early is the one lever a worker holds, and it doubles as pressure on the sponsor to close the gap for everyone in the plan.
The rule’s real effect may be to pressure plans rather than punish savers. By making a Roth account the only route for a large share of the workers most likely to fund catch-ups, the law gives employers a strong reason to add the feature, and many are expected to do so. Whether the smallest employers move quickly enough to spare their highest earners a lost year of catch-up savings is the unresolved question, and until a given plan adds the option, the workers it covers carry the cost.
This article was produced with AI assistance and reviewed against primary sources by The Money Overview editorial team.
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