2024 401k Contributions Catch Up. Workers who contribute to a 401 (k), 403 (b), most 457 plans, and the federal. Don't avoid investing for your future retirement years just because you're late to the party.

You can also contribute the full $7,000 to a roth ira for 2024.  — for instance, you can contribute up to $23,000 to a 401 (k) by the last business day of 2024.