from their website "We charge sales tax for orders shipped within Nebraska. Sales tax is automatically computed on product(s) costs. To see the total sales tax charged on your order, click on the checkout button underneath your mini-shopping cart on the left of the page. For Sager Orders where the customer resides in California, XOTIC PC will cover the added shipping expense to have your machine sent into our Nebraska facility to avoid California Taxes (by default). If a customer prefers to pay the California Tax, this can be set up by request. "