2024 401k Contribution Limit Catch Up Date. In 2022, the most you can contribute to a roth 401(k) and contribute in pretax contributions to a traditional 401(k) is $20,500. If you are age 50 or over in 2023 or 2024, you can contribute up to an additional $7,500.

Limit increase at certain ages:  — that compares with the $500 boost seen in 2024 over 2023.