If you are a US customer, or are ordering books for delivery to a US customer, you may notice GST being applied to your invoice.
US Goods and Services Tax is a consumption tax applied to products and services sold into a state.
What products and services attract the tax can vary between states, but books are included within GST for most US states.
Critically, the rate of GST applied to a sale is the one that is relevant in the state that is the destination for the product, not the location of the customer. So, a book ordered by an author for delivery to a customer in a different state would attract GST based on the tax rate in the customer’s state, not the author’s state