Solo 401k Contribution Limits 2024 Over 50. The total contribution limit for a solo 401(k) in 2024 is $69,000 if you're younger than 50. Total contributions to a solo 401(k) cannot exceed $66,000 or $73,500 for those at least aged 50.

The 2024 solo 401(k) contribution limits will increase those totals. Solo 401k plans allow for some of the highest contribution limits among retirement accounts.