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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 is a defined contribution plan, meaning that the retirement income you receive from your TSP account will depend on how much you (and your agency, if you are eligible to receive agency contributions) put into your account during your working years and the earnings accumulated over that time.