Thrift Savings Plan (TSP) Summary of Returns Below are the latest TSP returns of the G, F, C, S, I and L investment funds as calculated by the Thrift Savings Plan. A description of each of the TSP funds here. Previous Calendar Year — TSP Returns [Pinch-to-zoom/enlarge images below] Current Year (2021) — Thrift Savings Plan Returns [Pinch-to-zoom/enlarge … [Read more...] about Thrift Savings Plan (TSP) Returns: Monthly and Annual