The pre-tax 401(k) contribution limit for 2026 is $24,500, up from $23,500 in 2025.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 If you’re 50 or older, you can add a catch-up contribution on top. And starting January 1, 2026, a new SECURE 2.0 rule forces higher earners to make those catch-up contributions on a Roth basis, which effectively caps their pre-tax deferral at the $24,500 base.
The $24,500 Base Limit
Under IRC Section 402(g), $24,500 is the most you can defer from your salary into a pre-tax 401(k) for the 2026 tax year.2Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits Every dollar you contribute reduces your taxable income for the year. Someone in the 24% bracket who maxes out avoids roughly $5,880 in current-year federal income tax, and the money grows tax-deferred until withdrawal.
Two things about this cap trip people up.
First, it’s a per-person limit, not a per-plan limit. If you work two jobs that each offer a 401(k), your combined deferrals across both plans can’t exceed $24,500 for the year.3Internal Revenue Service. Consequences to a Participant Who Makes Excess Annual Salary Deferrals Each employer only sees what you defer into its own plan, so if you switch jobs mid-year or hold two positions at once, tracking the total falls on you.
Second, pre-tax and Roth 401(k) contributions share the same $24,500 ceiling. Splitting your money doesn’t give you two limits. If you route $10,000 into a Roth 401(k), you have only $14,500 of pre-tax room left for the year.2Internal Revenue Service. Retirement Topics – 401(k) and Profit-Sharing Plan Contribution Limits
Catch-Up Contributions at Age 50 and Older
If you turn 50 at any point during 2026, you can contribute an extra $8,000 on top of the standard $24,500, bringing your personal ceiling to $32,500.1Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 It doesn’t matter whether your birthday is in January or December. You qualify for the full catch-up as long as you hit 50 by year-end.
SECURE 2.0 added a higher catch-up for a narrow age window. If you turn 60, 61, 62, or 63 during 2026, your catch-up jumps to $11,250 instead of $8,000, for a total personal deferral of $35,750.4Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living This enhanced amount only applies if your plan has been updated to allow it. Once you turn 64, you drop back to the standard $8,000 catch-up.
The New Roth Rule for Higher Earners
Starting January 1, 2026, a SECURE 2.0 provision changes how catch-up contributions work for higher-paid employees. If your FICA wages from a single employer exceeded $150,000 in the prior year, any catch-up you make through that employer’s plan has to go into a Roth account. You aren’t required to make a catch-up at all, but if you do, it has to be after-tax Roth dollars.
This directly shapes the pre-tax number for anyone it applies to. A worker aged 55 earning $180,000 in 2025 can still defer $24,500 pre-tax in 2026, but the additional $8,000 catch-up must be Roth. So the effective pre-tax maximum for affected high earners is $24,500, while workers under the $150,000 threshold can put the entire $32,500 into pre-tax. The $150,000 threshold is indexed for inflation in future years.
The $72,000 All-Sources Cap
Your personal deferrals are only part of what can flow into your account. IRC Section 415(c) sets a separate ceiling covering everything combined: your contributions, employer matching, profit-sharing, and any after-tax contributions the plan allows. For 2026, that total can’t exceed $72,000.4Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted for Changes in Cost-of-Living Catch-up contributions sit on top of this, so a 50-year-old could theoretically receive up to $80,000 in total plan contributions.
Most workers never come near this number. It requires very generous employer contributions on top of maxed-out deferrals. If your employer contributes 10% of a $200,000 salary, that’s $20,000 in employer money plus your $24,500 deferral, or $44,500 total. Well under the cap. The $72,000 ceiling usually only bites for business owners or participants in aggressive profit-sharing formulas.
What Happens If You Contribute Too Much
Over-contributing is easy to do when you change jobs mid-year, because your new employer’s payroll has no way to know what you already deferred elsewhere. The fix is straightforward but time-sensitive.
Notify your plan administrator as soon as you find the excess. The corrective distribution, which is the excess amount plus any earnings on it, has to be completed by April 15 of the following year. That date is fixed. Filing a tax extension does not extend it.5Internal Revenue Service. Consequences to a Participant Who Makes Excess Deferrals to a 401(k) Plan The administrator calculates the excess and attributable gains or losses and returns the full amount to you. The excess deferral is included in your taxable income for the year you originally contributed it. The earnings are taxable in the year they’re distributed. You’ll get a Form 1099-R for the corrective distribution. If the excess spans two employers, you contact each administrator separately and decide which plan returns the money.
Miss the April 15 deadline and the result is genuinely painful: double taxation. The excess is taxed once in the year you contributed it and again when you eventually withdraw it from the plan, potentially decades later.5Internal Revenue Service. Consequences to a Participant Who Makes Excess Deferrals to a 401(k) Plan You get no basis credit for the amount that was already taxed. The same dollars are fully included in your income twice.