Please note that only a tax professional can help you determine when and where you are subject to tax.
For purchases we determine are based in the US (either based on shipping address or other means), a sales tax percentage will be applied to the cart. This sales tax rate we use is not guaranteed to be up to date and is meant solely to help build a buffer for your remittance.
While we do our best to get the tax rate percentage correct, it's your responsibility to accurately calculate and file your taxes.
Tax settings are available in the Settings section of your store dashboard.