Solo 401 K Contribution Limits 2024 Married. Those 50 and older can contribute an additional $7,500. Total contributions to a solo 401(k) cannot exceed $66,000 or $73,500 for those at least aged 50.
— what are the new solo 401k contribution limits for 2024? — the total employee contribution limit to all 401(k) and 403(b) plans for those under 50 will be going up from $23,000 in 2024 to $23,500 in 2025.