How do I resolve 'The Tax field cannot be left blank, even for non-taxable customers and sales which have no taxable items' in QuickBooks Desktop?

Overview

You are trying to save an invoice but receive error "The Tax field cannot be left blank, even for non-taxable customers and sales which have no taxable items, so non-taxable sales will be correct for this district."

Environment

QuickBooks

Resolution

• Ensure the Tax Item (Sales Tax Settings) on the Customer Record is set to AVATAX
  • If already set to AVATAX, change to something other than AVATAX then change it back to AVATAX then click Save
• Create a New invoice, don't click "Create a Copy".  "Create a Copy" will retain the blank tax item field on the invoice