A long-delayed SECURE 2.0 Act provision is now reshaping how high-paid workers save for retirement. Starting January 1, 2026, participants aged 50 and older who earned more than $150,000 in FICA wages from their employer in the prior year must make their catch-up contributions on a Roth (after-tax) basis rather than pre-tax. The Treasury and IRS finalized the rule late last year, with the wage threshold raised from $145,000 to $150,000 in a November 2025 update.
A Bigger Pot — and a Different Tax Bill
The rule lands the same year contribution limits move higher across the board. The IRS lifted the standard 401(k), 403(b) and governmental 457(b) deferral limit to $24,500 for 2026, up from $23,500 in 2025. The IRA limit rose to $7,500 from $7,000. Catch-up contributions for participants 50 and older remain at $8,000, while a "super catch-up" of up to $11,250 is available for those aged 60 to 63 whose plans permit it.
For high-earning savers, the math is no longer purely about deferral size. Catch-up dollars that previously reduced this year's taxable income will now flow into a Roth bucket, taxed today but withdrawn tax-free in retirement. Plan sponsors that do not currently offer a Roth feature must add one or stop accepting catch-ups from affected workers.
Records on Both Sides of the Balance Sheet
The policy shift arrives as 401(k) participants are sitting on the largest balances on record. Fidelity reported the average 401(k) account balance hit $146,400 at the end of 2025, up 11.2% from a year earlier. The total savings rate — combining employee deferrals and employer matches — held at 14.2% for the third straight year, the highest level Fidelity has tracked.
The headline averages mask a familiar gap. Fidelity's median balance was just $34,400, a reminder that strong aggregate numbers are pulled higher by long-tenured, high-income savers. Vanguard data show the median worker still defers roughly 7% of pay, which combined with a typical match lands near 11% — short of the 15% most planners recommend.
What Plan Sponsors Are Doing Now
The IRS regulations allow employers to apply a "reasonable, good-faith interpretation" through taxable years beginning in 2026, with plan documents required to be formally amended by December 31, 2026. Collectively bargained plans have until 2028, and governmental plans until 2029.
Behavior data suggest auto-features will continue to do much of the heavy lifting. Vanguard reported that 14% of participants increased their deferral rate in 2025 versus 8% who reduced it, and roughly 31% saw their rates pushed up automatically through annual escalation programs.
For affected high earners, the practical takeaway is straightforward: catch-up dollars will land in a Roth account whether they planned for it or not. Advisers are urging participants to check their plan's Roth status before the next pay period, model the cash-flow impact of paying tax up front, and revisit whether the standard $24,500 deferral is still being captured in full.
Sources: IRS ("401(k) limit increases to $24,500 for 2026"), IRS ("Treasury, IRS issue final regulations on new Roth catch-up rule"), Fidelity Investments Q4 2025 retirement analysis, Vanguard "How America Saves" data, InvestmentNews.