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Individual TSP Funds. 1  G Fund - Government Securities fund. The G Fund (think G for government securities) is invested in very short-term U.S. Treasury securities (bonds) guaranteed by the federal government. 2  F Fund - Fixed Income Index fund.
DEFINITION of 'Thrift Savings Plan-TSP'. A retirement savings plan created by the Federal Employee's Retirement System Act of 1986 for current or retired employees of the federal civil service.