The Internal Revenue Service (IRS) is a Bureau of the Department of the Treasury that collects and enforces taxes. Through the collection of taxes, the IRS compiles Tax Statistics on individuals, businesses, and charities.
The US Energy Information Administration reports on the energy used in the U.S. The reports include information on crude energy sources imported and exported, energy production in the US, and energy levels that are being used by consumers.
You can browse their Data Tools, Apps, and Maps page or retrieve Open Data and also view Reports, among others.