Solo Roth 401k Contribution Limits 2024. Solo 401k contribution limits are very high. If you are both 50 years old or older, this means that combined solo 401k contribution limits could be up to $147,000 per year!

For 2024, the solo 401(k) maximum contribution limit for the elective deferral is $23,000 if you’re age 50 and under. Save on taxes and build for a bigger retirment!