Final answer:
The federal government's primary sources of revenue are individual income taxes, payroll taxes for Social Security and Medicare, and corporate income taxes.
Step-by-step explanation:
The three areas from which the federal government receives the most money are individual income taxes, payroll taxes, and corporate income taxes. The largest source of revenue for the federal government comes from individual income taxes, accounting for 47% of total revenue in 2020. Following this, payroll taxes, which fund Social Security and Medicare, make up 38%. The third major source is corporate income taxes, also known as profits, which, while having decreased as a share of GDP over time, still represent a significant portion of the federal income.