Roth Limits 2025 401k 2025. 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. In 2025, you can contribute $23,000 to the roth portion of your solo 401 (k).

The maximum amount you can contribute to a roth 401 (k) for 2025 is $23,000 if you’re younger than age 50. The roth ira contribution limit for 2025 is $7,000 for those under 50, and $8,000 for those 50 and older.