2024 401k Contribution Limits Irs. On nov., 1, 2023, the irs boosted annual contribution limits for 2024 for 401 (k), 403 (b), and most 457 plans. Workers who contribute to a 401 (k), 403 (b), most 457 plans and the federal government’s thrift savings plan can contribute up.

 — there are limits to how much employers and employees can contribute to a plan (or ira) each year. Plan participants can contribute up to $23,000 for 2024, which is up.