To make this clearer, in 2018, the Federal Government spent $4.48 Trillion, which was equivalent to 22% of the nation’s entire nominal GDP. Of that total spending, ONLY $3.5 Trillion was financed by Federal revenues, and $986 billion was financed through debt.
In other words, if 75% of all expenditures go to social welfare and interest on the debt, those payments required $3.36 Trillion of the $3.5 Trillion (or 96%) of the total revenue coming in.
Currently, because of corporate tax cuts, a slowing economic environment, and weak wage growth, tax revenues have declined as federal expenditures have surged.