In 2015, total federal revenues in fiscal year 2015 are expected to be $3.18 trillion.² These revenues come from three major sources:

1. Income taxes paid by individuals: $1.48 trillion, or 47% of all tax revenues.
2. Payroll taxes paid jointly by workers and employers: $1.07 trillion, 34% of all tax revenues.
3. Corporate income taxes paid by businesses: $341.7 billion, or 11% of all tax revenues.

There are also a handful of other types of taxes, like customs duties and excise taxes that make up much smaller portions of federal revenue. Customs duties are taxes on imports, paid by the importer, while excise taxes are taxes levied on specific goods, like gasoline. This pie chart below shows how much each of these revenue sources is expected to bring in during fiscal year 2015.

On another note, Trump used $8M of donated campaign money to pay himself.