Yes, 401(k) catch-up contributions can be pre-tax, but not for everyone and not forever. If your plan offers both options, you generally choose between pre-tax (traditional) and Roth catch-ups the same way you choose for your regular deferrals. Starting in 2026, that choice disappears for higher earners: anyone whose FICA wages from the sponsoring employer exceeded $150,000 in the prior year must make catch-up contributions on a Roth basis.1Internal Revenue Service. Treasury, IRS Issue Final Regulations on New Roth Catch-Up Rule, Other SECURE 2.0 Act Provisions
The Default Rule: You Choose Pre-Tax or Roth
When your plan gives you both options and you’re not caught by the high-earner rule, catch-up contributions follow the same tax treatment as your ordinary deferrals. You can put the full catch-up into pre-tax, the full amount into Roth, or split it between the two.
Pre-Tax Catch-Ups
Pre-tax catch-up contributions come out of your paycheck before federal income tax is calculated. They reduce the wages shown in Box 1 of your W-2, so you owe less federal income tax this year.2Internal Revenue Service. 2026 General Instructions for Forms W-2 and W-3 The money and its growth are taxed as ordinary income when you take it out in retirement. This route tends to pay off if you expect a lower tax bracket after you stop working.
Roth Catch-Ups
Roth catch-up contributions come out after tax, so they don’t lower your current taxable income. Qualified withdrawals in retirement, including the investment growth, are tax-free. Roth generally favors people who expect their tax rate to hold steady or rise, and workers who still have many years of tax-free compounding ahead of them.
Early Withdrawals Are Treated the Same
Catch-up dollars don’t get special protection if you tap them early. Distributions before age 59½ are generally subject to ordinary income tax plus a 10% additional tax, and the usual exceptions (disability, separation from service after age 55, substantially equal periodic payments, and others) apply to catch-up funds exactly as they apply to the rest of your account.3Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
The 2026 Mandatory Roth Rule for High Earners
The SECURE 2.0 Act stripped the pre-tax choice away from higher-paid catch-up-eligible workers. You fall under the mandate if your FICA wages (Social Security wages from Box 3 of your W-2) from the employer sponsoring the plan exceeded $150,000 in the prior calendar year. For 2026 contributions, that means the IRS looks at your 2025 wages. The $150,000 threshold is indexed for inflation.4Internal Revenue Service. Notice 2025-67, 2026 Amounts Relating to Retirement Plans and IRAs
A few practical points follow from that:
- The trigger is FICA wages from the sponsoring employer, not household income and not adjusted gross income.
- Self-employment earnings aren’t FICA wages, so a sole proprietor with a solo 401(k) can generally still make pre-tax catch-ups.
- If your plan doesn’t offer a Roth feature and you’re a high earner subject to the rule, you cannot make catch-up contributions at all. There is no pre-tax carve-out. If Roth isn’t available in your plan, raise it with HR.
Who Qualifies and How Much You Can Add
You’re eligible for catch-up contributions if you turn 50 or older by December 31 of the contribution year and your plan document allows them. Not every plan does, so check with your plan administrator.5Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits Eligibility is calendar-year, not birthday-based: if you turn 50 in November 2026, you can start catch-ups in January 2026.
For 2026:
- Standard deferral limit: $24,500
- Age 50–59 and 64+ catch-up: $8,000 (total $32,500)
- Age 60–63 enhanced catch-up: $11,250 (total $35,750)
The enhanced 60–63 amount came out of the SECURE 2.0 Act, but employers aren’t required to adopt it. Your plan may cap catch-ups at $8,000 even if you’re in that age band.6Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
If You Contribute Too Much
Going over the catch-up limit creates excess deferrals, and the tax result is ugly: the excess is included in your taxable income for the year you contributed it and taxed again when you eventually withdraw it.7Internal Revenue Service. Consequences to a Participant Who Makes Excess Deferrals to a 401(k) Plan
You avoid the double taxation by asking your plan to distribute the excess (with earnings) by April 15 of the following year. That deadline is firm and doesn’t extend with a filing extension. If you contribute to more than one employer’s plan in the same year, tracking the combined total is your responsibility, not the employers’.
State Income Tax Treatment
Federal tax treatment isn’t the whole story. Most states with an income tax follow the federal rules, so pre-tax catch-ups also lower state taxable income. A handful of states limit or disallow the deduction for retirement plan contributions, and some states have no income tax at all. Confirm your state’s treatment before assuming a pre-tax contribution saves you state tax as well as federal.