Each state and/or local jurisdiction within the U.S. imposes a transactional tax generally referred to as the Sales Tax, which results in almost 10,000 different Sales Tax rates in the U.S.
For this reason when purchasing our products we may be required to collect state and local Sales Tax on your purchase. The applicable Sales Tax rate is based on the product and on the destination (shipping address), where you receive the purchase. If an invoice has multiple line items Sales Tax only applies to the taxable lines.
Please note that these regulations are constantly changing. In case of doubt, we therefore recommend you to contact a tax advisor to consult about the sales tax regulations for your product and shipping destination.