Based on an SBA study, small businesses pay an average tax rate of 19.8%. The actual tax rates that apply to small businesses vary significantly based on business entity, income, deductions, tax credits, and rates in effect for the year. Small C-corporations have the lowest average tax rate at 17.5%. The federal income tax system is progressive, meaning that the tax rate increases as income increases and ranges from 10 percent to 35 percent under current law. In addition, exceptions to the normal tax rules (e.g., deductions, exclusions, The state corporate income tax rates are different in every state. The federal corporate income tax rates are the same across the United States. They are based on the value of the profits the company earned. A company that earned up to $50,000 is taxed at 15 percent. A company that earned between $50,000