1. 401(K) Contributions Limits and Deadlines for 2025 and 2024
401(k) Contribution Deadlines
- Tax-year 2024 deadline is April 15th, 2025 (You may request an extension)
- Tax-year 2023 deadline is April 18th, 2024 (You may request an extension)
401(k), 403(b) and 457 Plan Contribution Limits for 2025 and 2024
The chart below provides a breakdown of the rules and limits for defined contribution plans 401(k), 403(b), and most 457 plans
Here is the 403(b), 457 and 401(K) maximum contribution limit for the year 2025-2024.
| Defined Contribution Plan Limits | 2025 | 2024 | Change |
| Elective contributions for all eligible workers | $23,500 | $23,000 | +$500 |
| Catch-up contributions for workers 50 and over | $7,500 | $7,500 | no change |
| Defined contribution maximum from all sources for workers under 50 | $70,000 | $69,000 | +$1,000 |
| Defined contribution maximum from all sources for workers 50 and over | $77,500 | $76,500 | +$1000 |
| Employee compensation limit for calculating contributions | $350,000 | $345,000 | +$5,000 |
| Key employees’ compensation threshold for nondiscrimination test testing | $230,000 | $220,000 | +$10,000 |
| Highly compensated employees’ threshold for nondiscrimination testing* | $160,000 | $155,000 | +$5,000 |
* For the 2025 plan year, an employee who earned more than $155,000 in 2024 is an HCE. For the 2026 plan year, an employee who earns more than $160,000 in 2025 is an HCE.
2. Solo 401k Contributions Limits and Deadlines for 2025 and 2024
Solo 401k Contribution Limits 2024-25
In Solo 401(k), the business owner is the employer and the employee. Thus, contributions to a Solo 401(k) can be made in both the capacities. Contributions to a Solo 401(k) consist of two types as follows:
1. Elective deferrals known as Employee Contributions.
| 2025 | 2024 | |
| Maximum elective deferral | $23,500 | $23,000 |
| Catch-up contribution for age 50 or older | $7,500 | $7,500 |
2. Profit sharing also known as Employer Contribution.
| 2025 | 2024 | |
| Maximum employer contribution | $47,000 | $46,000 |
| Catch-up contribution for age 50 or older | $7,500 | $7,500 |
Important note: For 2025, if the business owner decides to take the full $23,000 for the elective deferral, then he/she is limited to making only $46,500 in profit-sharing contributions, thus ensuring the contribution does not exceed $69,000.
For 2024, if the business owner decides to take the full $23,000 for the elective deferral, then he/she is limited to making only $46,000 in profit-sharing contributions, thus ensuring the contribution does not exceed $69,000.
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