The 401(k) remains one of the most powerful retirement savings tools available — but only if you understand the limits and use them strategically. IRS Notice 2025-67 (released Nov 2025) confirmed the 2026 plan-year limits shown below.
2026 401(k) Contribution Limits at a Glance
| Limit Type | 2026 Amount | 2025 Amount |
|---|---|---|
| Employee elective deferral (under age 50) | $24,500 | $23,500 |
| Catch-up contribution (age 50–59, 64+) | $8,000 | $7,500 |
| Enhanced catch-up contribution (age 60–63) | $11,250 | $11,250 |
| Total annual additions limit (Section 415) | $72,000 | $70,000 |
| Total with standard catch-up (age 50+) | $80,000 | $77,500 |
| Compensation limit for employer contributions | $360,000 | $350,000 |
The SECURE 2.0 Enhancement for Ages 60–63
Starting in 2025, SECURE 2.0 introduced a higher catch-up limit for participants aged 60, 61, 62, or 63: up to $11,250 instead of the standard $7,500. This window closes at age 64, reverting to the standard catch-up amount.
If you turn 60–63 during the plan year, you may be eligible for this enhanced catch-up — check with your plan administrator, as plan adoption of this feature varies.
Employee Elective Deferrals Explained
The $24,500 employee deferral limit is the maximum you can contribute from your own paycheck — before employer contributions. This limit applies per person, not per plan. If you participate in multiple 401(k) plans (for example, through two employers or a side business), the combined employee contributions across all plans cannot exceed $24,500.
These contributions are made pre-tax in a traditional 401(k), reducing your taxable income in the contribution year. In a Roth 401(k), contributions are made after-tax.
Employer Match: Free Money With Conditions
Most employer 401(k) plans include a matching contribution. Common structures include:
- 100% match on the first 3% of salary — you contribute 3%, employer adds 3%
- 50% match on the first 6% of salary — you contribute 6%, employer adds 3%
- Fixed contribution — employer contributes a set percentage regardless of employee contribution
Employer contributions do not count against the $24,500 employee limit. They count against the $72,000 total annual additions limit (Section 415 limit), which is the combined ceiling for all contributions — employee, employer, and after-tax — to a single plan.
Vesting Schedules
Employer match funds are often subject to a vesting schedule, meaning you do not own them outright until a certain period of service. Common schedules:
- Immediate vesting: You own employer contributions from day one
- Cliff vesting: 0% until a set date, then 100% (e.g., three-year cliff)
- Graded vesting: Gradual ownership over several years (e.g., 20% per year for five years)
Your own contributions are always 100% vested immediately.
Roth 401(k): Same Limits, Different Tax Treatment
A Roth 401(k) uses the same $24,500 contribution limit as a traditional 401(k) — it is not a separate limit. You can split contributions between traditional and Roth, but the combined total cannot exceed $24,500.
| Feature | Traditional 401(k) | Roth 401(k) |
|---|---|---|
| Contributions | Pre-tax | After-tax |
| Tax benefit now | Reduces current taxable income | No current deduction |
| Withdrawals in retirement | Taxable | Tax-free (if qualified) |
| Required Minimum Distributions | Required at age 73 | No RMDs (starting 2024 per SECURE 2.0) |
When to choose Roth: If you expect to be in a higher tax bracket in retirement than you are today, or if you want tax-free income in retirement to reduce RMD obligations.
When to choose traditional: If you are currently in a high bracket and want the immediate deduction, or if you need the reduced taxable income to stay below a threshold affecting other deductions or credits.
Worked Example: Maximizing a 401(k)
Suppose you earn $110,000 and your employer offers a 100% match on the first 4% of salary.
Your contribution at maximum ($24,500):
- Employee deferral: $24,500
- Employer match (4% of $110,000 = $4,400): $4,400
- Total 401(k) contributions: $27,900
Tax savings from the traditional 401(k) deferral (assuming 22% marginal bracket):
- $24,500 × 22% = $5,390 in federal income tax saved
The employer match provides a 100% return on the first 4% of salary — a $4,400 benefit on a $4,400 contribution. Contributing at least enough to capture the full employer match is almost always the right financial decision.
After-Tax Contributions and the Mega Backdoor Roth
Some plans allow after-tax contributions beyond the $24,500 employee limit, up to the $72,000 total limit. These are distinct from Roth 401(k) contributions. Combined with an in-plan Roth conversion or in-service distribution, after-tax contributions can be converted to Roth in what is commonly called the mega backdoor Roth strategy.
For example, if your employer contributes $8,000, you could potentially contribute an additional $39,500 after-tax ($72,000 − $24,500 − $8,000) if your plan allows it. Converted to Roth, this future growth would be tax-free.
Not all plans support this. Check your plan’s Summary Plan Description.
Contribution Deadlines
- Employee deferrals: Must be withheld from paychecks on a per-paycheck basis throughout the year. You cannot make a lump-sum employee deferral at year-end (unlike an IRA).
- Employer contributions: Employers have until their tax-filing deadline (including extensions) to make employer contributions for the prior year.
- Catch-up contributions: Elected the same way as standard deferrals — specify the amount per paycheck.
The Impact on Taxes: A Before and After
| Scenario | Taxable Income | Federal Tax (22% bracket) |
|---|---|---|
| No 401(k) contribution | $110,000 − $16,100 std deduction = $93,900 | ~$15,370 |
| Max $24,500 traditional 401(k) | $110,000 − $24,500 − $16,100 = $69,400 | ~$9,980 |
| Tax savings | ~$5,390 |
(Simplified; actual tax calculation uses bracket tiers.)
Key Takeaways
- The 2026 employee deferral limit is $24,500; total annual additions cap is $72,000.
- Workers aged 50–59 or 64+ can contribute an extra $8,000 catch-up (2026); those aged 60–63 can contribute an extra $11,250 (SECURE 2.0 enhancement).
- Employer match does not count against the employee limit but counts against the $72,000 total.
- Traditional 401(k) reduces taxable income now; Roth 401(k) provides tax-free income in retirement.
- Always contribute at least enough to capture your full employer match — it is an immediate 50–100% return on those dollars.
- After-tax contributions plus Roth conversion (mega backdoor Roth) can extend tax-advantaged savings further if your plan allows it.