Solo 401k Contribution Limits 2024. The contribution limits for a solo 401 (k) plan are determined by both employee and employer contributions. More people will be able to make contributions to roth.

For 2024, you can contribute a combined total of $69,000 (up from $66,000 in 2023). For 2024, the max is $69,000 and $76,500 if you are 50 years old or older.