Task: Override Taxes on an Order
The tax rate for your entire account is configured under Admin > Rules > General Rule Sets > Adjustments. Any changes made in the "Adjustments" will ONLY apply to new orders going forward. Secondly, tax rates can be configured for individual cities and zip codes in Admin > Order Config > Service Areas. If a customer is tax exempt, then you will need to manually override taxes on the "Customer Info" screen (or blue "Customer" link on the Order box).