The maximum amount of money you can contribute to your 401(k) each year, set by the federal government. The limits change every year to track inflation. In 2018 you can contribute up to $18,500. If you’re 50 or older, you can contribute an additional $6000 (called a “catch-up contribution”), for a total of $24,500. These limits do not include the match contributed by your employer to your account.