Why is my exempt customer getting taxed?

Overview

I have a valid exemption certificate and tax is still being applied on the invoice.

Environment

Avalara Avatax

Resolution

• The shipping method is not set to delivery.
• The certificate is for regions, other than the invoices ship to address. 
  • You should also check for address information on the lines, if you pass line level addressing. 
• The Avalara Certs begin and end dates do not encompass the document date.
• The customer code is different.
• The certificate was added after the invoice was created.