"One of those measures is called “disinvesting” the largest fund in the Thrift Savings Plan, the 401(k)-style retirement savings program for federal employees and military personnel, the government securities G fund. The fund consists of special-issue Treasury securities that are reinvested each business day and that count against the debt limit.
By not making the reinvestments, the Treasury in effect takes that obligation off the books, freeing up an equivalent amount of money for other uses. “After the debt limit impasse has ended, the G Fund is made whole. Therefore participants in the Thrift Savings Plan who contribute to the G Fund are unaffected,” the letter said."
