Solo 401k Contribution Limits 2024 Married. The most a person under age 50 can contribute to a solo 401(k) is $70,000 for 2025, up from $69,000 in 2024. This is an increase of $500 from 2023.

The most a person under age 50 can contribute to a solo 401(k) is $70,000 for 2025, up from $69,000 in 2024. The 401(k) contribution limit for 2024 is $23,000 for employee contributions, and $69,000 for the combined employee and employer contributions.