For two decades, the catch-up contribution has worked the same way: hit age 50, and the IRS lets you stuff an extra slug of pre-tax dollars into your 401(k). That mechanic is changing in 2026. Under final regulations the Treasury and IRS issued for the SECURE 2.0 Act, high-earning workers age 50 and older can no longer make pre-tax catch-up contributions — those dollars must go into a designated Roth account inside the plan.
The shift is narrow but expensive for the savers it touches, and it lands at the same moment the IRS is raising contribution limits across the board.
Who the New Rule Catches
The rule applies to anyone age 50 or older who participates in a 401(k), 403(b), or governmental 457(b) plan and whose prior-year FICA wages from that same employer exceeded $145,000 (indexed for inflation). For the 2026 plan year, the lookback is to 2025 wages, and the actual threshold is $150,000 after indexing.
A few details worth pinning down:
- The test is based on FICA wages from one employer, not household income or self-employment income. Two spouses earning $140,000 each are both unaffected.
- Only the catch-up portion flips to Roth. Regular pre-tax deferrals up to the base $24,500 limit remain available to everyone in 2026.
- IRA catch-up contributions are not affected. This rule lives entirely inside employer plans.
The mandatory-Roth treatment applies to the full 2026 catch-up amount: $8,000 for participants age 50–59 and age 64+, or the elevated $11,250 super catch-up for participants ages 60 through 63 under another SECURE 2.0 provision.
The 2026 Contribution Limits in Context
The IRS lifted nearly every retirement number for 2026:
- 401(k), 403(b), 457(b), TSP elective deferral: $24,500 (up from $23,500)
- Standard age 50+ catch-up: $8,000 (up from $7,500)
- Age 60–63 "super" catch-up: $11,250 (unchanged)
- IRA contribution limit: $7,500 (up from $7,000)
- IRA age 50+ catch-up: $1,100 (up from $1,000)
- SIMPLE IRA: $17,000, with a higher $18,100 limit for certain plans
A 55-year-old earning $200,000 at a single employer can therefore defer up to $32,500 in 2026 — but the last $8,000 of it has to be Roth.
Why This Matters for Tax Planning
The catch-up contribution was, historically, one of the few remaining unambiguously pre-tax levers available to high earners. Losing it forces a re-think on several fronts.
Current-year tax bills go up. A worker in the 32% federal bracket who used to deduct an $8,000 catch-up now pays roughly $2,560 more in federal tax in the contribution year. That cash has to come from somewhere — either reduced take-home pay or a smaller contribution.
Retirement-era taxes go down. Roth dollars grow and withdraw tax-free, with no Required Minimum Distributions on the Roth 401(k) starting in 2024 under another SECURE 2.0 provision. For savers who expect to be in a similar or higher bracket in retirement — increasingly common for high earners with large traditional 401(k) balances — the trade may be neutral or favorable on a lifetime basis.
Plan design becomes the gating factor. A plan that does not offer a Roth option cannot accept catch-up contributions from affected employees at all. Good-faith compliance was required starting January 1, 2026, with full enforcement on contributions in tax years beginning after December 31, 2026.
Practical Takeaways
- Confirm your plan offers a Roth 401(k) source. If it does not, ask HR when it will. Otherwise, your catch-up capacity disappears entirely in 2026.
- Re-budget for the higher tax bill. If you intend to keep contributing the full catch-up, set aside the extra federal and state tax that used to be deferred.
- Re-examine the Roth IRA backdoor. With $8,000 of forced Roth space already in the 401(k), some savers will find their Roth allocation is now front-loaded enough to skip a backdoor Roth IRA conversion.
- Coordinate with Roth conversion strategy. If you were already planning conversions in your 50s, the new forced Roth flow reduces the conversion amount needed to hit the same target Roth balance by retirement.
- Watch the wage cliff. Crossing $150,000 in FICA wages from one employer in 2025 triggers the rule for 2026. Workers near the threshold who control bonus timing have a small window to plan around it.
The new rule does not raise or lower how much high earners can save — it changes the tax flavor of the last slice. For most savers it touches, that means a higher tax bill today in exchange for a larger tax-free pool decades from now. The decision was made for them by Congress, but the planning around it still has to happen at the kitchen table.
Sources: Internal Revenue Service, U.S. Treasury Final Regulations, Charles Schwab, Manulife John Hancock Retirement, Quarles Law Firm