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The Igen Blog: Ultimate Excise Tax Guide Definition, Examples, State vs. Federal
This is a fairly detailed explanation of state and federal excise taxes designed for the layperson, not for tax experts.
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.