Solo 401k Contribution Limits 2024. The irs announced that for 2024, the employee deferral limit for all 401 (k)s, including solo 401 (k)s, will be $23,000. In 2023, the most you can contribute to a roth 401 (k) and contribute in pretax contributions to a traditional 401 (k) is $22,500.

2 here’s how those contributions break down: Here is what you can expect to see next year.