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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 TSP provides Federal employees the same types of savings and. tax benefits that many private corporations offer their employees under so-called 401(k) plans. The Internal Revenue Code, in 26 U.S.C. Â§ 7701(j), states that the TSP is to be treated.