If your order is delivered to the following state you're responsible for sales tax, visible during the checkout process.
If your order is delivered internationally you're responsible for VAT (Value Added-Tax) or GST (Goods and Services Tax), visible during the checkout process.
Curious if you're required to pay sales tax, VAT, or GST? Continue through the checkout flow, as if you were completing your purchase. Enter your shipping details and continue without entering your billing details. If you're responsible for taxes it'll be displayed when you're ready to enter your payment details.