Solo 401k Contribution Limits 2024 Irs. The contribution limits are adjusted for inflation every year by the irs. The irs maximum contribution to a solo 401k is $66,000 for 2023 (or $73,500 for those over age 50) and $69,000 for 2024 (or $76,500 for those over age 50).
This is an increase of $500 from 2023. In 2024, solo 401(k) participants can contribute up to $66,000 as a combination of employee salary deferrals and employer contributions.