Solo Roth 401k Contribution Limits 2024. As kiplinger has reported, if you are younger than 50, the maximum amount you can contribute to a roth 401(k) for 2024 is $23,000. The roth 401(k) contribution limit for 2024 is $23,000 for employee contributions and $69,000 total for both employee and employer contributions.

For 2024, you can contribute up to $69,000 to your solo 401 (k), or $76,500 if you’re 50 or older. This is an extra $500 over 2023.