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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.
For example, if you want to borrow $10,000 from your TSP, you will receive a check for $9,950. The interest rate you will pay for the life of the loan will be the same as the rate paid by the G-Fund, which is the government debt option in the thrift savings plan.