What type of tax system does the United States use?

Answer: Progressive tax system

Explanation: The progressive tax system is where the income of an individual is taxable based on his or her capacity to pay. The individuals who earn less pay lesser tax as compared to higher-earning individuals.

The tax system doesn't impose a burden on those who don't have a sufficient amount to pay as taxes. By doing this the people who earn low income will be able to maintain a high living standard and the people who earn more are able to afford the basic necessities. So it balances the economy.