When To Start 2025 Tsp Contribution. The 2025 calendar year starts january 1, 2025 and ends december. For 2025, federal employees under the age of 50 can contribute up to $23,500 to their tsp accounts, marking a modest increase from the 2024 limit of $23,000.

These limits define the contributions that can be made to the thrift savings plan (tsp) for the calendar year. The 2025 contribution limit to the thrift savings plan is increasing to $23,500 per year, an increase of 2.2% over the 2024 annual limit ($23,000), according to an announcement from the internal revenue service.