You are trying to calculate sales tax, but do not see any sales tax item to select on the Invoice or Estimate in QuickBooks. You do not have the option anywhere to select a sales tax item. Clicking on a customer record, you cannot change the tax item because it is grayed out.
- This indicates QuickBooks does not have sales tax enabled
- Log into QuickBooks as "admin"
- Go to Edit > Preferences > Sales Tax > choose tab Company Preferences
- Change the option to Yes and make sure "your most common sales tax item" is set to "AVATAX" to use it by default