How many types of federal taxes exist?

There are several types of federal taxes in the United States, primarily categorized into three main groups: income taxes, payroll taxes, and excise taxes. Income taxes are levied on individual and corporate earnings, payroll taxes fund Social Security and Medicare, and excise taxes are imposed on specific goods and services. Additionally, there are estate and gift taxes that apply to wealth transfers. Overall, the federal tax system is complex and encompasses various forms depending on the source of income and transaction.