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Is sales tax for online purchases based on billing- or shipping address?
Apparently it's based on either the address of the seller or vendor or your shipping address; from the AccurateTax.com blog post Destination and Origin Based Sales Tax: ... a few states have laws that are origin-based, where products that are shipped to the customer are taxed based on the location of the business itself. As of this writing, these states are Most states use destination-based sales tax, which defines the source of the transaction to be the destination at which the product will eventually be used, or the address to which the product is shipped. ... The following states [and districts] operate on a destination-based model at the time of this writing: The page Do I Charge Sales Tax or Not? from about.com seems to (somewhat) clarify that if the business is located in a state (or other jurisdiction) with an origin-based sales tax, then they will charge you the sales tax for their state and, presumably, not the sales tax for the state of the shipping address.