2025 401k Roth Contribution Limits 2025. 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 contribution limit will increase from $22,500 in 2023 to $23,000.

Retirement savers are eligible to put $500 more in a 401(k) plan in 2025: This is an extra $500 over 2023.