The IRS announced on Thursday that the limit on elective deferral for contributions to 401(k) plans, 403(b) plans, most 457 plans, and the federal government’s Thrift Savings Plan will increase from $18,000 in 2017 to $18,500 for 2018. However, the catch-up contribution limit for those 50 and older remains $6,000 (Notice 2017-64).