2025 Maximum 401k Contribution Over Age 50. For 2025, the 401 (k) limit for employee salary deferrals is $23,000, which is above the 2023 401 (k) limit of $22,500. The base 2025 maximum 401k contribution limit for employees is $23,000 (+$500 versus 2023).

For those with a 401 (k), 403 (b), or 457 plan through an employer, your new maximum contribution limit will go up to $23,000 in 2025. The 401 (k) contribution limits for 2025 are $23,000 for individuals under 50, and $30,500 for those 50 and older.