2024 401k Limits Catch Up After Tax. Those 50 and older can contribute an additional $7,500. 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.

Of note, the 2024 pretax limit that applies to elective deferrals to irc section 401 (k), 403 (b) and 457 (b) plans increased from $22,500 to $23,000. Those 50 and older can contribute an additional $7,500.