Roth 401k Catch Up Contribution Limits 2024. The maximum amount you can contribute to a roth 401 (k) for 2024 is $23,000 if you're younger than age 50. 401(k) (other than a simple 401(k)).
In 2023, the most you can. $6,500 plus an additional $1,000 for employees age 50 or older in 2023;