2024 401k Contributions Maximum. The maximum amount you can contribute to a roth 401 (k) for 2024 is $23,000 if you're younger than age 50. This limit applies to both traditional and roth employee contributions.

The basic employee contribution limit for 2024 is $23,000 ($22,500 for 2023). The total maximum that can be tucked away in your 401 (k) plan, including employer contributions and allocations of forfeiture, is $76,500 in 2024.