Solo 401k Contribution Limits 2024 Over 50. The 401k contribution limits for the year 2025 are expected to see many increases in different plans including elective deferral limit to $24,000, defined contribution plan to $71,000,. For 2023, the solo 401(k) contribution limits are $66,000 or $73,500 if you are at least age 50.

Find out how much you can contribute to your solo 401k with our free contribution calculator. With employer contributions, you can.