By default, 401(k) catch-up contributions are pre-tax: they come out of your paycheck before federal and state income tax, lowering your taxable wages for the year. You can instead designate them as after-tax Roth contributions if your plan offers that option. Starting in 2026, though, one group loses the choice — high earners must make their catch-up contributions on a Roth basis. So the answer to whether 401(k) catch-up contributions are pre-tax or after-tax depends on your wages, your plan’s features, and your own election.
Pre-Tax by Default, Roth by Election
A traditional catch-up contribution works like any other pre-tax 401(k) deferral. Your employer pulls the money out before calculating income tax withholding, which reduces your taxable income for the year. Earn $100,000, contribute $8,000 in catch-up dollars, and your reported taxable wages drop to $92,000. Investment gains grow untaxed inside the account, and you pay ordinary income tax on withdrawals in retirement.
If your plan includes a Roth 401(k) feature, you can instead route your catch-up contributions there. Roth contributions are made with after-tax dollars, so they don’t lower your current taxable income. In exchange, qualified withdrawals in retirement — including earnings — generally come out tax-free. The annual dollar limit is the same either way.
The 2026 Roth Requirement for High Earners
Section 603 of the SECURE 2.0 Act added a new rule at Internal Revenue Code Section 414(v)(7): if your FICA wages from the employer sponsoring your plan exceeded $145,000 in the prior calendar year, any catch-up contributions you make must be designated as Roth.1Office of the Law Revision Counsel. 26 U.S. Code 414 – Definitions and Special Rules You lose the pre-tax option. The $145,000 threshold is set by statute and is indexed for inflation in $5,000 increments for years after 2024.2Federal Register. Catch-Up Contributions
The IRS delayed enforcement of the rule through an administrative transition period that ran through December 31, 2025.3IRS. Guidance on Section 603 of the SECURE 2.0 Act with Respect to Catch-Up Contributions Final Treasury regulations issued in September 2025 formally apply to taxable years beginning after December 31, 2026, but the transition period was not extended.4Internal Revenue Service. Treasury, IRS Issue Final Regulations on New Roth Catch-Up Rule, Other SECURE 2.0 Act Provisions For 2026, plans may implement the requirement using a reasonable, good-faith interpretation of the statute. In practice, if you’re a high earner making catch-up contributions in 2026, expect your plan to require Roth treatment.
What Counts as Your Wages for This Test
The income test uses your FICA wages — the Social Security wages in Box 3 of your W-2 — not total compensation and not adjusted gross income.2Federal Register. Catch-Up Contributions Only wages from the employer sponsoring the plan count, so a second job at an unrelated employer doesn’t factor in. The final regulations do allow a plan administrator to aggregate wages from certain related employers.
If Your Plan Doesn’t Offer Roth
Under Section 414(v)(7)(B), any plan subject to the mandatory Roth catch-up rule has to offer a Roth contribution option to eligible participants.1Office of the Law Revision Counsel. 26 U.S. Code 414 – Definitions and Special Rules If your employer’s plan doesn’t provide one, high earners in that plan can’t make catch-up contributions at all until the employer adds Roth. Participants below the wage threshold can still make pre-tax catch-up contributions regardless.
SIMPLE 401(k) plans are exempt from the mandatory Roth catch-up rule entirely.1Office of the Law Revision Counsel. 26 U.S. Code 414 – Definitions and Special Rules
Who Can Make Catch-Up Contributions
Catch-up contributions are authorized by Internal Revenue Code Section 414(v). To qualify, you must turn 50 or older by December 31 of the year you contribute.5Office of the Law Revision Counsel. 26 U.S.C. 414 – Definitions and Special Rules A December 31 birthday counts. You must also have already hit the standard elective deferral limit for the year — $24,500 for 2026 — before additional deferrals qualify as catch-up amounts.6Internal Revenue Service. COLA Increases for Dollar Limitations on Benefits and Contributions
Employers aren’t required to offer catch-up contributions. Your plan’s governing documents must specifically allow them.7Internal Revenue Service. Retirement Topics – Catch-Up Contributions Check with your plan administrator or benefits office to confirm.
2026 Contribution Limits
For 2026, the standard catch-up limit for participants age 50 and older is $8,000, up from $7,500 in 2025. Combined with the $24,500 regular elective deferral limit, an eligible participant can defer up to $32,500 total.8Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500
Enhanced Limit for Ages 60 Through 63
SECURE 2.0 created a higher catch-up limit for participants aged 60, 61, 62, or 63. For 2026, this enhanced limit is $11,250 instead of $8,000, bringing the maximum total deferral to $35,750.8Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 Once you turn 64, you drop back to the standard $8,000 catch-up limit.
SIMPLE 401(k) Plans
SIMPLE 401(k) limits are lower. For 2026, the standard SIMPLE catch-up is $4,000 for participants age 50 and older, and $5,250 for those aged 60 through 63.9Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits
Setting Up Your Election
Confirm your plan allows catch-up contributions, then check your year-to-date deferrals. You need to be on pace to reach the $24,500 standard limit before additional contributions count as catch-up. Most employers handle the election through the same payroll or plan-provider portal you use for regular 401(k) deferrals, and you can typically pick a flat dollar amount or a percentage of pay per paycheck.
If you’re a high earner subject to the Roth requirement, verify that your plan offers a Roth 401(k) option and that your catch-up election is designated as Roth. Save the confirmation. Elections usually take one to two pay cycles to show up, so review your next few pay stubs to make sure the deductions match what you chose.