In addition to the price of your purchases, mophie will charge you sales tax based on your shipping address and the sales tax rate in effect at the time your order is billed. If you phone in your order, the mophie Online Store sales representative will provide an estimated dollar total of your order, including tax and any applicable shipping charges, at the time you place your order. If the sales tax rate for the state to which your order is being shipped changes before the product is shipped, the rate in effect at the time your order is invoiced will apply.