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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 offers all participants: 1  Tax deferral on contributions. 2  A choice of 5 investment funds. 3  A loan program. 4  In-service withdrawals for financial hardship or after age 59. 5  A choice of post-separation withdrawal options. 6  The ability to transfer money from other eligible retirement savings plans into your TSP account.