Roth 401k Contribution Limits 2025. Here’s what you need to know for 2025. For 2025, the most you can contribute to a roth 401 (k), a traditional 401 (k), or a combination of the two is $23,500.
Employees age 50 and older can contribute an additional $7,500 for a total of $31,000. 401(k), 403(b), most 457 plans, and thrift savings.