Solo 401k Contribution Limits 2025. In 2025, the 401(k) contribution limit for participants is increasing to $23,000, up from. Those 50 and older can contribute an additional $7,500.

For 2025, the employee contribution limit for 401(k) plans is $23,000, up from $22,500 in 2023. Over 50 401k contribution limits 2025.