The largest denomination of U.S. currency since 1969 is the $100,000 bill, which was last issued in 1945. These bills were primarily used for transactions between banks and the U.S. Treasury and were not circulated among the general public. The $100,000 bill was discontinued in 1969 as part of a move to simplify the U.S. currency system and reduce the risk of counterfeiting. The largest currently circulating U.S. currency denomination is the $100 bill.