401k Contribution Limits for 2026
Every 2026 limit in one table: the $24,500 deferral, both catch-ups, the $72,000 total ceiling, the new mandatory Roth catch-up for high earners, and the solo 401k math most 1099 earners leave on the table.
A guide by Taxstra Tax & Accounting · CPA-led tax strategy for business owners
Written by Bryan Martin, CPA, Managing Partner and Founder of Taxstra. Last updated July 19, 2026.
The 2026 401k employee contribution limit is $24,500, a $1,000 jump from 2025 and the largest single-year increase since 2023. That headline number is also the least interesting one on this page. The total amount that can land in a 401k in 2026 is $72,000, or $80,000 at age 50 and up, once employer money and after-tax contributions are counted. Below is the full table, the catch-up rules that changed, and the self-employment math that turns a side business into a second retirement plan.
The 2026 401k Limits Table
Every number that matters, with 2024 and 2025 for comparison
All of these come from IRS Notice 2025-67, released in November 2025. The 2026 column is what applies to paychecks and plan contributions dated January 1, 2026 or later, regardless of which plan year your employer uses for other purposes.
| Limit | 2024 | 2025 | 2026 |
|---|---|---|---|
| Employee deferral (401k, 403b, most 457) | $23,000 | $23,500 | $24,500 |
| Catch-up, age 50 and older | $7,500 | $7,500 | $8,000 |
| Enhanced catch-up, ages 60 to 63 | N/A | $11,250 | $11,250 |
| Total 415(c) limit (employee + employer) | $69,000 | $70,000 | $72,000 |
| 415(c) limit with age-50 catch-up | $76,500 | $77,500 | $80,000 |
| Annual compensation limit (401(a)(17)) | $345,000 | $350,000 | $360,000 |
| Highly compensated employee threshold | $155,000 | $160,000 | $160,000 |
| SIMPLE IRA deferral limit | $16,000 | $16,500 | $17,000 |
| SIMPLE catch-up, age 50+ | $3,500 | $3,500 | $4,000 |
| SEP IRA maximum contribution | $69,000 | $70,000 | $72,000 |
| Traditional / Roth IRA limit | $7,000 | $7,000 | $7,500 |
| IRA catch-up, age 50+ | $1,000 | $1,000 | $1,100 |
| Social Security wage base | $168,600 | $176,100 | $184,500 |
2026 figures per IRS Notice 2025-67. The enhanced age 60-63 catch-up began in 2025 under SECURE 2.0 and applies only in the calendar years you turn 60, 61, 62, or 63. The employee deferral limit is shared across all 401(k) and 403(b) plans you participate in during the year; the 415(c) limit applies per unrelated employer.
Two details on the catch-ups. First, the enhanced 60-63 catch-up applies by calendar year of birthday: the year you turn 64, you drop back to the regular $8,000. Second, plans are not required to offer the enhanced catch-up, so check your plan document before you build a paycheck plan around $35,750.
How the Employer Match Interacts With the Limits
Your match never eats your $24,500, but it does share the $72,000
The tax code runs two separate meters. The 402(g) meter counts only your own deferrals and stops at $24,500. The 415(c) meter counts everything landing in your account, your deferrals, the match, profit sharing, and any after-tax contributions, and stops at $72,000 for 2026. Catch-up contributions are the one thing that count against neither, which is why a 50-year-old's true ceiling is $80,000.
How the 2026 Limits Stack: $24,500 Is the Floor, Not the Ceiling
Catch-up contributions do not count against the $24,500 deferral limit or the $72,000 total limit, so a 50-year-old can reach $80,000 of total 2026 contributions, and a 60 to 63 year old can reach $83,250 in plans that adopt the enhanced catch-up.
The compensation limit matters more than most people realize. A plan can only base its match formula on the first $360,000 of 2026 pay. If your employer matches 4% and you earn $500,000, the match is 4% of $360,000 ($14,400), not 4% of $500,000. High earners who front-load deferrals should also confirm whether the plan has a true-up; without one, hitting the deferral cap early forfeits match in the remaining pay periods.
Worked example with round numbers: an employee earning $200,000 defers the full $24,500 and receives a 5% match, $10,000. Total additions are $34,500, leaving $37,500 of unused room under the $72,000 ceiling. That unused room is the raw material for after-tax contributions and the mega backdoor Roth, covered in section 6.
The New Roth Catch-Up Rule for High Earners
2026 is the year the delayed SECURE 2.0 rule finally applies
SECURE 2.0 required high earners to make catch-up contributions as Roth beginning in 2024, then the IRS granted a two-year administrative transition. That transition is over. For 2026, if your Social Security wages from the employer sponsoring the plan exceeded $150,000 in 2025, every catch-up dollar you contribute must go into the Roth side of the plan. No deduction, tax-free growth instead.
Three planning wrinkles worth knowing:
The test is per employer, prior year, FICA wages. Switch jobs in 2026 and you have no 2025 wages from the new employer, so the rule does not apply there. Self-employment earnings are not FICA wages at all, so a sole proprietor or partner with a solo 401k can still make pre-tax catch-ups regardless of income. An S corp owner, though, pays themselves W-2 wages, and those wages count.
If the plan has no Roth option, high earners lose catch-ups entirely. A plan that never added a Roth source cannot accept a mandatory-Roth catch-up, so affected participants simply cannot make one. Most large plans have added Roth by now; smaller plans are the ones to check.
Forced Roth is not a penalty. For someone already weighing Roth conversions at today's rates, an $8,000 Roth catch-up is money moved to the tax-free column at your marginal rate without any conversion paperwork. Whether that trade wins depends on your current bracket versus your expected retirement bracket, which is the actual planning question underneath all of this.
Solo 401k Math: Employee Plus Employer, Same Person
How a 1099 earner reaches numbers a W-2 employee cannot
In a solo 401k you wear both hats. As the employee, you defer up to $24,500. As the employer, you contribute up to 25% of your W-2 compensation, or effectively about 20% of net self-employment earnings if you are a sole proprietor (the percentage shrinks because the contribution and half your self-employment tax both reduce the base). The combined total is capped at $72,000 for 2026, plus catch-up on top.
Worked example (hypothetical, illustrative round numbers)
A 1099 physician moonlights and nets $200,000 of Schedule C profit in 2026 alongside a hospital W-2 job where she already maxes the $24,500 deferral. Her solo 401k employee deferral is $0, because the $24,500 limit is shared across all her plans. But the employer side is fresh: roughly 20% of net self-employment earnings, about $37,000 on these facts after the self-employment-tax adjustment, all deductible, all in addition to everything at the hospital.
Now run the same $200,000 for a consultant with no W-2 job. She defers $24,500 as the employee and adds the same roughly $37,000 employer piece, about $61,500 of total 2026 contributions, deducted against income that would otherwise be taxed at her top rate. At an illustrative 32% federal rate that is roughly $19,700 of federal tax deferred in one year. Add the $8,000 catch-up at 50 and the total clears $69,000.
The exact employer-contribution number depends on your entity type, self-employment tax, and whether you have employees who would trigger coverage rules. Run your own numbers in the solo 401k calculator, and if you are choosing between plan types, the SEP IRA vs solo 401k comparison walks through why the solo 401k usually wins below about $290,000 of net income.
401k vs Roth 401k vs Solo 401k vs SEP vs SIMPLE
Five plans, one comparison, 2026 numbers
The right plan depends on who funds it, how much room you need, and whether you have employees. Here is the 2026 field at a glance.
| Feature | Traditional 401k | Roth 401k | Solo 401k | SEP IRA | SIMPLE IRA |
|---|---|---|---|---|---|
| 2026 employee deferral | $24,500 | $24,500 (shared limit) | $24,500 | None (employer-funded) | $17,000 |
| Age-50 catch-up | $8,000 | $8,000 | $8,000 | None | $4,000 |
| Max total (under 50) | $72,000 | $72,000 | $72,000 | $72,000 | $17,000 + employer |
| Contributions taxed | Pre-tax | After-tax, tax-free out | Either or both | Pre-tax | Pre-tax (Roth allowed) |
| Who funds it | Employee + employer | Employee (+ Roth match if offered) | Same person, both hats | Employer only, 25% of comp | Employee + required employer piece |
| Best fit | W-2 employees | High savers betting on higher future rates | Self-employed, no employees | Simple setup, high-income SE | Small employers under ~100 staff |
| Loans allowed | If plan permits | If plan permits | If plan permits | No | No |
The pattern worth noticing: a SEP IRA needs roughly $290,000 of net self-employment income to hit $72,000, because it is employer-money-only at 25%. A solo 401k reaches the same ceiling on far less income because the $24,500 deferral comes off the top regardless of the percentage math. The SEP wins mainly on setup simplicity and on being fundable entirely at filing time.
Not sure which plan fits your income and entity?
A free initial consultation covers the plan choice, the contribution math, and how it interacts with your entity structure and estimated taxes.
Book a Free 30-Minute ConsultationThe Mega Backdoor Layer: After-Tax Contributions to $72,000
The gap between your deferral and the 415(c) limit is usable space
Some plans allow a third contribution type: after-tax (non-Roth) contributions. These do not reduce your taxable income, but they count only against the $72,000 total limit, not the $24,500 deferral limit. Contribute after-tax dollars, then convert them to Roth inside the plan or roll them to a Roth IRA, and the growth becomes tax-free. That two-step is the mega backdoor Roth.
Quick math on the 2026 ceiling: $24,500 deferral + $10,000 match leaves $37,500 of after-tax room before hitting $72,000. For a high earner already maxing everything else, that is $37,500 a year moving into the Roth column, several times the regular Roth IRA limit, with no income restriction. The plan must allow both after-tax contributions and a conversion mechanism, and maybe one plan in three does, so read the plan document first. The full mechanics, including the pro-rata and timing issues, are in the mega backdoor Roth guide, and you can model your own gap with the mega backdoor Roth calculator.
Where People Get Burned
The four recurring 401k limit mistakes we see
1. Two jobs, two payrolls, one limit.
Change employers mid-year and each payroll will happily let you defer $24,500. The limit is per person, not per plan. Excess deferrals not pulled out by April 15 of the following year get taxed twice, once going in and again coming out. If you switched jobs in 2026, add your year-to-date deferrals from the old W-2 before setting the new percentage.
2. Front-loading past the match.
Maxing out by summer feels disciplined and quietly forfeits match dollars in plans that match per pay period without a true-up. Check for a true-up provision; if there is none, spread deferrals so you contribute in every period.
3. Assuming the plan offers what the law allows.
The enhanced 60-63 catch-up, Roth deferrals, after-tax contributions, and in-plan conversions are all optional plan features. The law permitting something does not mean your plan document adopted it. The summary plan description settles every argument.
4. Solo 401k owners who forget they grew.
Cross $250,000 of plan assets and Form 5500-EZ becomes an annual filing with real late-filing penalties. Hire your first employee and the plan generally stops being a solo plan at all, picking up coverage and testing requirements. Both transitions are easy to miss and expensive to discover late.
One more account belongs in this conversation: if you are on a qualifying high-deductible health plan, the HSA is effectively additional retirement space with a better tax profile than the 401k itself. The numbers are on our HSA contribution limits page.
Frequently Asked Questions
2026 401k contribution limits, answered
Turn the Limits Into an Actual Plan
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