You are trying to post an invoice in QuickBooks but receive error 'Tax could not be calculated: Object Reference not set to instance of an object'.
- Click "File" > "AvaTax" > "Utilities", click 'Synchronize & View Unresolved Sales Tax Errors'.
- Select the invoice receiving the error
- Click "Recalculate"
Invoice should display line Total sales tax calculated by AvaTax