Think OP is talking about public debt (~$15 trillion) not intergovernmental debt (~$20 trillion). GDP has little to do with federal revenue; the federal governm

Think OP is talking about public debt (~$15 trillion) not intergovernmental debt (~$20 trillion). GDP has little to do with federal revenue; the federal government doesn’t tax 100% of all exchanged money. Federal revenue is about $3.6 trillion.