2024 401k Max Contribution. The contribution limit for simple 401 (k)s is $16,000 (up to $19,500 if you're 50 or older). This limit includes all elective employee salary deferrals and any contributions.

In 2024, the contribution limit for a roth 401 (k) is $23,000, plus an additional contribution of $7,500 if you are age 50 or older. Employees can invest more money into 401(k) plans in 2024, with contribution limits increasing from 2023’s $22,500 to $23,000 for 2024.