Where does the money come from? For the federal government, OMB has a table [see 2.2]that shows that this year 43.7% of receipts come from income taxes, 11.6% from corporate taxes, 36.4% from social insurance and retirement receipts, and 2.9% from excise taxes. All other federal receipts, including customs duties and estate taxes, amount to 5.4%.
I know that there's waste and inefficiency in government. Trouble is, it's not in a single, separate line item.