Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Is sales tax for online purchases based on billing- or shipping address?
From Amazon's Site:  "If an item is subject to sales tax in the state to which the order is shipped, tax is generally calculated on the total selling price of each individual item." I'm going to trust a company of this size has this correct. Shipping address.