Sales taxes are easy to understand and they are transparent, in that it is easy to see what is being charged and why. When you are in a certain state, you can know that if you buy something you will have a certain amount of additional tax.
Because of that, some people will cross state lines to make certain purchases to avoid the higher sales tax in their own jurisdiction. Most states have a state tax, and 38 states allow a local sales tax, meaning that the combined rate could be much larger than expected.
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