2025 Max Roth 401k Contribution Limits. As kiplinger has reported, if you are younger than 50, the maximum amount you can contribute to a roth 401(k) for 2025 is $23,000. The following table shows the 2025 dollar.

2025 401 (k)/403 (b)/401 (a) total contribution limit. For 2025, the irs has increased the standard 401 (k) contribution limit to $23,500, a $500 rise from 2025.