To customize taxability for some products, you need to map the items to UPCs and model numbers. Send the the UPC or model number from QuickBooks Desktop to AvaTax Update. If the UPC isn't available, the model number is set as the default and sent to AvaTax Update.
- In QuickBooks Desktop, go to File > AvaTax > Preferences.
- Select Taxability > UPCs.
- Select the item code you want to map from the UPC Field list.
- Select Save.