The first paychecks of 2026 delivered a jolt to millions of older workers who earn six figures. Take-home pay dropped, even though salaries stayed the same. The culprit: a new federal rule that forces higher-earning employees to make their 401(k) catch-up contributions on an after-tax Roth basis, wiping out an upfront tax deduction many had relied on for years.
As of January 1, 2026, any worker age 50 or older whose FICA wages from a single employer exceeded $145,000 in the prior calendar year can no longer funnel catch-up contributions into a traditional, pre-tax 401(k) account. Every dollar of catch-up money must now go into a designated Roth account, where it is taxed on the way in but grows and comes out tax-free in retirement.
The change traces back to the SECURE 2.0 Act, signed into law in December 2022. Congress originally set the Roth-only catch-up requirement to begin in 2024, but the IRS recognized that employers needed more lead time. IRS Notice 2023-62 granted a two-year transition period, pushing the mandatory start date to January 1, 2026. The Treasury Department’s final regulations, issued in January 2025, confirm the rule is in effect for taxable years beginning after December 31, 2025. There is no further delay.
Who is affected and who is not
The rule is narrower than many people assume. Under Internal Revenue Code Section 414(v)(7), only employees whose FICA wages (the amount reported in Box 3 or Box 5 of your W-2) from a single employer topped $145,000 in the prior calendar year must make catch-up contributions on a Roth basis. That threshold is employer-by-employer, not based on your total adjusted gross income across all jobs, investments, or side income.
If your FICA wages from your employer were $145,000 or less last year, nothing changes. You can still split catch-up contributions between pre-tax and Roth however your plan allows.
The $145,000 figure is indexed for inflation and may rise in future years. For the 2026 plan year, the determination is based on 2025 wages.
How much money is at stake
For workers 50 and older, the standard catch-up contribution limit for 2026 is $7,500, on top of the regular 401(k) elective deferral limit of $23,500. But SECURE 2.0 also created a higher catch-up tier for a narrow age band: employees who turn 60, 61, 62, or 63 during the calendar year can contribute up to $11,250 in catch-up dollars, per IRC Section 414(v)(2)(D). For high earners in that age window, the Roth-only mandate applies to the full enhanced amount.
The tax impact is tangible. Consider a 62-year-old earning $200,000 who had been making the maximum pre-tax catch-up contribution. That $11,250 deduction, at a 32% marginal federal rate, was worth roughly $3,600 in annual tax savings. Starting in 2026, that upfront break disappears. The trade-off: those Roth dollars will compound tax-free and can be withdrawn tax-free in retirement, provided the account has been open at least five years and withdrawals occur after age 59 and a half.
The Roth five-year clock matters
Workers who have never had a designated Roth account inside their employer plan should pay attention to one detail that is easy to overlook. The five-year holding period for qualified Roth distributions starts when you first contribute to a Roth account within that specific plan, not when you first opened a Roth IRA elsewhere. If your employer just added a Roth option in 2026 to comply with this rule, your five-year clock begins in 2026. For someone planning to retire at 63 or 64, that timing could matter. Withdrawals of earnings before the five-year mark may be taxable, even if you are over 59 and a half.
What your employer had to do
The rule created a significant compliance lift for plan sponsors. Any 401(k) plan that accepts catch-up contributions from workers above the wage threshold must now offer a designated Roth account. Plans that lacked a Roth option faced a binary choice: add one, or stop accepting catch-up contributions from higher earners altogether.
The final regulations, codified at 26 CFR 1.414(v)-2, spell out correction mechanics for plans that fail to comply and coordinate the Roth-only requirement with existing nondiscrimination testing rules so that adding a Roth feature does not inadvertently create other compliance problems.
The operational challenge falls heavily on payroll. Systems need to pull each participant’s prior-year W-2 data, flag those above $145,000 in FICA wages, and automatically route their catch-up contributions to Roth before the first payroll cycle of the new year. Large recordkeepers such as Fidelity, Vanguard, and Empower had years to prepare. Smaller employers relying on older payroll software or manual processes have found the transition harder. The regulations allow for “reasonable, good-faith” compliance efforts during the transition, but that grace period does not eliminate the underlying obligation. Mistakes could trigger operational failures requiring correction through IRS programs like the Employee Plans Compliance Resolution System (EPCRS).
It is not just 401(k) plans
The Roth-only catch-up requirement extends to 403(b) plans, commonly used by teachers, hospital workers, and nonprofit employees, and to governmental 457(b) plans. The same $145,000 wage threshold and the same Roth designation requirement apply. If your retirement savings run through one of these plan types and your prior-year FICA wages exceeded the threshold, you are subject to the same rule.
One notable exception: the rule does not apply to solo 401(k) plans used by self-employed individuals who have no common-law employees. Self-employed workers do not receive W-2 wages, so the FICA wage threshold does not apply in the same way. The IRS has not issued specific guidance addressing this edge case in detail, so self-employed plan holders should consult a tax professional.
What affected workers should weigh now
Losing the upfront deduction hurts in the current tax year, but the long-term math is not automatically worse. Whether Roth catch-up contributions leave you better or worse off depends largely on your tax rate today versus your expected tax rate in retirement.
If you expect to drop into a lower bracket after you stop working, paying tax now on catch-up contributions costs more than deferring would have. If you expect your retirement tax rate to hold steady or climb, perhaps because of required minimum distributions pushing up taxable income, Social Security benefits becoming partially taxable, or future legislative rate increases, Roth contributions could save you money over a full retirement.
One factor worth noting: Roth 401(k) balances are not subject to required minimum distributions during the account holder’s lifetime, thanks to a separate SECURE 2.0 provision that took effect in 2024. That gives Roth dollars more flexibility for estate planning and tax management in later years.
A few practical steps worth discussing with a tax advisor or financial planner:
- Keep contributing if you can. Losing the deduction is not a reason to stop making catch-up contributions. Tax-free growth and tax-free withdrawals in retirement carry significant value, especially over a 10- to 20-year horizon.
- Confirm your plan’s Roth setup. Check with your HR department or plan administrator that your employer’s plan has a designated Roth account and that payroll is routing your catch-up dollars there correctly.
- Mind the five-year clock. If 2026 is the first year you are contributing to a Roth account inside your employer plan, mark the calendar. The five-year holding period for tax-free earnings withdrawals starts now.
- Explore other deductions. If the lost catch-up deduction creates a gap in your current-year tax planning, consider whether maximizing a health savings account (HSA), making deductible traditional IRA contributions (if eligible), or accelerating charitable giving can offset some of the impact.
- Review your W-4 withholding. Pre-tax catch-up contributions used to reduce your taxable wages automatically. With Roth treatment, your taxable wages are higher, which may change your withholding math. Adjusting your W-4 early in the year can prevent an unexpected bill at tax time.
How the statutory date and regulatory date differ
One wrinkle has caused confusion among plan administrators and participants alike. The SECURE 2.0 statutory requirement is effective for taxable years beginning after December 31, 2025, meaning it applies starting in 2026. The Treasury Department’s final regulations, which provide the detailed implementation roadmap, have a general applicability date for taxable years beginning after December 31, 2026, meaning 2027 and beyond. During 2026, plans may rely on the final regulations under a reasonable, good-faith standard, or they may follow the statutory text and earlier IRS guidance directly. For workers, the practical takeaway is straightforward: the Roth-only catch-up mandate is already in force for 2026, regardless of when the full regulatory framework formally applies.
What remains unsettled heading into summer 2026
The IRS has not published data on how many workers fall above the $145,000 threshold and actively make catch-up contributions, so estimates of the rule’s revenue impact and its effect on retirement savings participation remain rough. The Congressional Budget Office scored SECURE 2.0 as a package, but a granular breakdown of this single provision’s fiscal impact has not been released publicly as of June 2026.
Behavioral effects are also an open question. Some advisors have predicted that losing the upfront deduction could discourage a portion of higher earners from contributing at all. Others counter that workers already making catch-up contributions tend to be committed savers unlikely to stop over a change in tax timing. No peer-reviewed study or IRS data has yet measured the actual participation response since the rule took effect in January.
Enforcement is similarly early-stage. The correction mechanics built into the final regulations suggest the IRS anticipated compliance gaps, but no public enforcement actions or correction-program filings tied specifically to the Roth catch-up rule have appeared in agency records as of mid-2026. How aggressively the IRS pursues noncompliant plans, and how forgiving the correction process proves to be, will shape the real-world experience for employers and employees alike in the months ahead.
Paul Anderson is a finance writer and editor at The Financial Wire. He has spent seven years writing about investment strategies and the global economy for digital publications across the US and UK. His work focuses on making sense of economic policy, cost-of-living issues, and the stories that affect everyday Americans.
