Solo 401 K Contribution Limits 2024 Calendar. The irs maximum contribution to a solo 401k is $66,000 for 2023 (or $73,500 for those over age 50) and $69,000 for 2024 (or $76,500 for those over age 50). The total solo 401 (k) contribution limit (employee + employer contribution) is up to $66,000 in 2023.

The total solo 401(k) contribution limit is up. Employees can invest more money into 401 (k) plans in 2024, with contribution limits increasing from 2023’s $22,500 to $23,000 for 2024.