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Originally Posted by HarryT
there seem to be innumerable resources for looking up the rate of sales tax from a ZIP code,
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If they use 13 digit zip codes, then it has a fighting chance of being accurate within 1%. IE, if it claims 5.5%, the correct rate is somewhere between 4.6% and 6.4%.
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so it doesn't seem like much of an issue even if the customer's location were involved.
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For the United States, calculating the correct sales tax rate can be extremely complicated, due to how and where the boundary lines for the various tax districts fall. The other half of the problem is knowing which agencies that can impose sales tax, do impose it, and how much they impose, which is something that some state revenue departments appear to be unable to keep track of.
Amber