What is the largest source of revenue for the federal government?

The largest source of revenue for the federal government is federal income tax. This tax is levied on individuals' earnings and the profits of corporations. It constitutes a significant portion of the federal government's overall revenue and plays a crucial role in funding various government functions and services, such as healthcare, education, national defense, and infrastructure.

Federal income tax operates on a progressive tax system, where individuals are taxed at higher rates as their incomes increase. This allows for a more equitable approach to taxation, as wealthier individuals contribute a larger share of their income compared to those with lower earnings.

While property tax, sales tax, and corporate tax contribute to federal and state revenues, they do not account for as large a percentage of federal income. Property taxes are primarily collected at the local and state levels, sales taxes are also state-imposed, and corporate taxes contribute to the federal budget but do not match the scale of revenue generated from individual income taxes. Thus, federal income tax stands out as the predominant source of revenue for the federal government.