2024 Max 401k Contribution Catch Up. Workers who contribute to a 401 (k), 403 (b), most 457 plans and the federal government’s thrift savings plan can contribute up to $23,000 in 2024, a $500 increase from the $22,500 limit in 2023. Those 50 and older can contribute an additional $7,500.

Plan sponsors will also need to consider the following if. Total 401(k) plan contributions by an employee and an employer cannot exceed $69,000 in 2024.