The investment limit on tax-favored retirement savings plans such as the TSP will remain $18,000. That’s the cap on regular investments by employees, called the “elective deferral limit.” For those making investments on a percentage of salary basis, investments will rise automatically with the pay raise–as will agency contributions, for those under FERS. The separate limit on “catch-up contributions”–additional investments allowed for those 50 or older in a calendar year–similarly will stay flat at $6,000. Those who made catch-up investments this year will have to make a new election if they want to make them again in the new year; unlike regular investments, those don’t carry over from year to year.