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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.
The Thrift Savings Plan (TSP) is a long-term retirement saving account thatâs very similar to a 401k in the private sector. The TSP is called a defined contribution plan because its results depend upon how much you save and how your investments perform.