2024 401k Contribution Limit Calculator. Find out how much you can contribute to your solo 401k with our free contribution calculator. Solo 401(k) contribution limits for 2024 in 2024, aggregate contributions can reach up to $69,000 if you are under 50 and $76,500 if you are 50 or older.

This amount is up modestly from 2024, when the individual 401(k) contribution limit was $23,000, or $30,500 for employees who were 50 or older. Savers will be able to contribute as much as $23,500 to a 401(k) in 2025, up from $23,000 in 2024.