Income Taxes

Overview

Income taxes are taxes governments levy on money earned by businesses and individuals. What's more, they're also many countries' largest source of revenue: In the US, individual income taxes made up nearly half of the federal government's revenue in 2024, while corporate income taxes added another 11%.

Enshrined in the 16th Amendment, the individual income tax the US uses today was enacted in 1913. World War II prompted the federal government to greatly expand the number of people required to pay income taxes, from about 5% of American workers in 1939 to 90% submitting tax forms and 60% paying income taxes by the end of the war.

Because income taxes' primary purpose is financing government operations—such as funding public programs like food stamps benefiting lower-income households—these taxes are also seen as an economic tool to redistribute resources and reduce inequality. But taxation is historically contentious. Critics argue income taxes discourage career advancement and push taxpayers to move to areas with lower rates.

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