Current participants can change their future contributions or the way they are invested.
The plan offers three investment funds. The C fund diversifies investments in stock markets and is the riskiest but potentially the highest yielding fund. The F fund invests in notes, bonds and other obligations that return the amount invested and pay interest at a specified rate over a period of time. The G fund invests in short-term, nonmarketable U.S. Treasury securities specifically issued to the Thrift Savings Plan. Investments earn interest at a rate equal to average market securities with four or more years of maturity.