Irs Maximum 401k Catch Up Contribution 2024.  — starting in 2024, employees can contribute up to $23,000 into their 401(k), 403(b), most 457 plans or the thrift savings plan for federal employees, the irs announced nov.  — the 2024 contribution limit for 401(k) plans is $23,000, up from $22,500 in 2023.

 — the 401(k) employee contribution limit for 2024 is $23,000. The limit on employer and employee contributions is $69,000.