2024 401k Contribution Limits Catch Up.  — for instance, you can contribute up to $23,000 to a 401 (k) by the last business day of 2024. The limit for overall contributions—including the employer match—is 100%.

 — for instance, you can contribute up to $23,000 to a 401 (k) by the last business day of 2024.  — contribution limits for a roth 401 (k) are the same as for a traditional 401 (k).