Today, the largest source of federal revenue comes from which source?

• A. Corporate income tax
• B. Payroll taxes
• C. Excise taxes
• D. Individual income tax (about half of revenues)

Answer: (D)

Individual income taxes are the largest source of federal revenue today, making up about half of all receipts. This reflects how the tax system is set up: the broad base of workers and other earners regularly have income taxed, and withholding from paychecks provides a steady, sizable stream of revenue. The rates are progressive, but the sheer number of earners and the dollars involved keep this source dominant.

Payroll taxes for Social Security and Medicare contribute a substantial share as well and are the next major source, though they typically fall short of the income tax total. Corporate income taxes bring in funding from profits earned by corporations, but their share is smaller and more volatile, influenced by business profits and policy changes. Excise taxes, applied to specific goods and activities, tend to be the smallest of the main revenue sources.

So, the reason this source stands out is its broad base and regular collection from a large proportion of the population, which together generate about half of federal revenue.