A change written into the 2022 retirement law finally reaches paychecks in 2026, and it lands hardest on the workers who save the most. Under the rule, employees age 50 and older who earned above a set wage threshold can no longer take their extra “catch-up” retirement contributions as pre-tax dollars. Those catch-up amounts now have to go in as after-tax Roth money, meaning the tax is paid up front instead of deferred. For a late-career saver used to shaving thousands off taxable income each year, the shift quietly raises this year’s tax bill.
Who counts as a higher earner under the rule
The requirement does not touch every older worker, only those over an income line. It applies to catch-up contributions made by employees whose wages from the plan’s employer in the prior year exceeded a threshold that the Treasury indexes for inflation. The provision started at $145,000, and the IRS’s 2026 retirement plan limits announcement raised the figure that governs 2026 contributions to $150,000 in prior-year wages. A worker 50 or older who made more than that from their employer in 2025 falls under the Roth catch-up requirement for 2026; one who earned less can still make catch-up contributions the old pre-tax way.
The wage test has some sharp edges worth noting. The $150,000 figure looks only at wages from the employer that sponsors the plan, measured in the prior calendar year, so a worker who changes jobs starts fresh under the new employer’s payroll rather than carrying the prior year’s income across. The threshold also keys off Social Security wages, which means a partner or self-employed individual with no such wages from the plan sponsor can fall outside the requirement even at a high income. Those distinctions decide, employer by employer, which late-career savers lose the pre-tax option and which keep it.
The dollars at stake are the catch-up amounts layered on top of the regular limit. The IRS set the standard 401(k) elective deferral limit at $24,500 for 2026, with an additional catch-up allowance for those 50 and older, and a larger catch-up for workers ages 60 through 63 under a separate SECURE 2.0 provision. Whatever an affected higher earner puts in as catch-up now counts as Roth, so the tax break that used to come with those contributions disappears for that slice of savings.
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How the 2026 start date survived a two-year delay
The rule was supposed to arrive earlier and was pushed back once already. When plans and payroll systems said they could not be ready in time, the IRS granted a two-year administrative transition period under Notice 2023-62 that let catch-up contributions keep flowing pre-tax without violating the requirement. That grace period, according to the agency’s final regulations issued in September 2025, generally ends on December 31, 2025. Once it closes, the requirement is live, which is why 2026 is the first year affected higher earners must send catch-up dollars to Roth.
The final regulations themselves carry a slightly later formal applicability date, generally taking effect for contributions in taxable years beginning after December 31, 2026, with a further delay for certain governmental and collectively bargained plans. But the same regulations permit plans to apply the Roth catch-up rule for earlier years using a reasonable, good-faith interpretation of the law, and they do not extend the transition relief past the end of 2025. The practical effect for 2026 is that plans covering higher earners are expected to route catch-up contributions to Roth, even as the detailed regulatory machinery becomes mandatory in 2027. The notice that created the transition period was the last reprieve; there is no new one.
What losing the upfront deduction costs a late-career saver
The money question is what changes when a catch-up contribution moves from pre-tax to Roth. A pre-tax catch-up lowers taxable income in the year it is made, so a high earner in a top bracket effectively gets the government to subsidize part of the contribution through a smaller tax bill. A Roth catch-up gives up that upfront break: the full amount is taxed as current income, and only the future growth and withdrawals come out tax-free. For someone contributing several thousand dollars in catch-up money while still earning a peak salary, the near-term cost is real, because those dollars are being taxed at the highest rate the worker will likely ever face.
The trade is not all downside. Roth money grows and comes out untaxed in retirement, and it is not subject to the lifetime required-withdrawal rules that force money out of traditional accounts, so a saver who expects high income or higher tax rates later may come out ahead. What the rule removes is the choice. A high earner who preferred the pre-tax deduction on catch-up contributions no longer has it, and the planning task becomes managing the timing of income around a tax bill that now arrives sooner rather than later. The IRS’s final regulations lay out exactly who is covered and when, and for the workers over the wage line, the answer is now.
The Roth default that plans must build in
The rule reaches the mechanics of the plan itself, not just the saver’s tax return. A workplace plan is never forced to offer catch-up contributions, but the final regulations make clear that if a plan permits them and covers any higher earner caught by the wage test, it has to provide a Roth option for those catch-ups; otherwise the affected employees cannot make catch-up contributions at all. To keep the money flowing, the regulations let a plan treat an affected participant’s catch-up election as a Roth election automatically, with the worker free to opt out. That default is why many higher earners will see their catch-up dollars land in the Roth side of the plan without taking any action.
The size of that Roth bucket can be substantial for the oldest workers still on the job. Under a separate SECURE 2.0 provision, employees between 60 and 63 are allowed an enhanced catch-up equal to the greater of $10,000 or 150 percent of the standard catch-up amount, indexed for inflation, on top of the regular deferral limit. For a higher earner in that age band, the combination means a larger-than-usual slice of pay is both eligible for catch-up treatment and required to go in as after-tax Roth money, concentrating the upfront tax cost in exactly the years many workers are trying to make a final push toward retirement.
This article was produced with the assistance of artificial intelligence and reviewed by The Financial Wire editorial team.
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Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
