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State Taxes
This site provides tax information about each state in the United States simply by clicking on the name of the state. Links further down the page can be used to find specific state taxes, such as payroll and sales taxes.
Bankrate
Bankrate: Sales Tax: Definition, How It Works, and How to Calculate It
Forty-five states and many local government impose sales taxes on most goods and some services. This article explains the difference between sales taxes and income taxes, and how sales taxes are levied.