Final answer:
The major supplier of federal government revenue is individual income taxes, which along with payroll taxes constituted 82 percent of all federal revenue in 2010.
Step-by-step explanation:
The major supplier of revenue dollars received by the United States federal government is income taxes. Specifically, in fiscal year 2010, individual income taxes and payroll taxes accounted for 82 percent of all federal revenues.
In comparison, corporate income taxes contributed approximately nine percent.
Over the years, there has been a shift in the composition of tax revenue with payroll taxes accounting for a larger share while corporate income and excise taxes represent smaller shares. The Tax Cuts and Jobs Act passed in 2017 has impacted corporate income tax rates, leading to a decrease in this source of revenue.