2024 401k Contribution Max Age. You can invest up to $23,000 in 401(k) plans in 2024, and anyone age 50 or older can put in an extra $7,500. Employers can only use the first $345,000 of compensation to determine your 401.

Those 50 and older can contribute an additional $7,500. The 401(k) contribution limit is $23,000 in 2024.