If you earned more than $150,000 in Social Security wages last year and you're 50 or older, the IRS just took away a choice you've had for decades. Starting this year, any catch-up contribution you make to a 401(k), 403(b), or governmental 457(b) plan has to go into a Roth account -- after-tax -- instead of pre-tax. The final regulations came out of the Treasury and IRS in late 2025, and 2026 is the year most employer plans are actually applying them (IRS, IR-2025-91).
For high-earning professionals and business owners who have spent years using catch-up contributions specifically to lower this year's taxable income, that's a real change in strategy, not just a paperwork update.
What the Rule Actually Requires
The test is narrower than it sounds. It applies only to wages from Social Security and Medicare -- box 3 on last year's W-2 -- from the employer sponsoring the plan, not your total household income. If that number was above $150,000, any catch-up contribution above the standard deferral limit must be Roth. Your regular contribution up to the standard limit is unaffected and can still be pre-tax or Roth, whichever you prefer. IRAs are not touched by this rule at all -- it applies to employer-sponsored plans only (IRS, IR-2025-91). Starting in 2026, a 401(k) plan must offer a Roth option for any employee who wants to make catch-up contributions, or no one at that income level can make one -- a detail that has caught some employers off guard as much as employees.
The New 2026 Numbers
The dollar limits moved up as well this year. The standard elective deferral limit for 401(k), 403(b), 457(b), and federal Thrift Savings Plan accounts is $24,500. The standard catch-up for those 50 and older is $8,000, bringing the total to $32,500. For a narrower group -- those turning 60, 61, 62, or 63 during 2026 -- SECURE 2.0's "super catch-up" allows $11,250 instead of $8,000, for a total of $35,750. IRA contribution limits rise to $7,500, with a $1,100 catch-up for those 50 and older (IRS, Notice 2025-67; IR-2025-111).
A Real Example -- Robert's Situation
Robert is a 61-year-old physician in Virginia Beach who has maxed out his catch-up contribution every year since turning 50, specifically to bring down his taxable income during his highest-earning years. Under the new rule, that catch-up money -- up to $11,250 of it this year, since he qualifies for the super catch-up -- now has to go in as Roth. He'll pay tax on it now instead of later. Left unaddressed, that's simply a bigger tax bill this year. Addressed properly, it's an opportunity: that money now grows completely tax-free, with no future required distributions from the Roth portion, at exactly the stage of his career when his tax bracket is unlikely to go lower.
Does This Mean You'll Pay More in Taxes This Year?
For the catch-up portion specifically, yes, in most cases -- you're paying tax on money that used to go in tax-deferred. But that doesn't have to mean a worse overall outcome. The right response usually isn't to stop making catch-up contributions; it's to look at the rest of the picture -- entity structure and QBI planning if you're a business owner, the timing of bonus or year-end income, and whether other retirement or tax-deferred vehicles can offset the difference -- so the mandate becomes one input into a broader plan rather than an isolated tax hit.
For a client at the $11,250 super catch-up level in the 35% federal bracket, that's roughly $3,900 more in current-year tax on that contribution alone. Spread across a household also managing quarterly estimates, a bonus, or a Roth conversion already in motion, that number is easy to lose track of unless someone is looking at the full year, not just the retirement account statement.
Why This Is a Tax Conversation, Not Just an Investment One
An advisor who only manages Robert's portfolio can tell him his Roth account will grow tax-free. That advisor generally can't tell him whether restructuring his practice's entity election, adjusting his estimated payments, or timing a year-end Roth conversion elsewhere would offset this year's higher tax bill from the mandatory Roth catch-up. That's a tax and legal question layered on top of an investment one -- exactly the kind of decision that gets missed when the people managing your money, your tax return, and your legal documents aren't in the same conversation.
What This Means for You
If you're 50 or older and earned more than $150,000 last year, plan on your catch-up contributions landing in Roth from here forward -- and use that as a prompt to look at the rest of your 2026 tax picture before year-end, not just your retirement account.
Let's Talk. If you want help thinking through what the new Roth catch-up rule means for your specific situation, contact us to schedule a conversation. At Alperin Law & Wealth, our wealth and tax teams review changes like this together, so a mandate like this one becomes part of your plan instead of a surprise on your account statement.
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