When it comes to determining Sales Tax then QuickBooks will consider if the Customer is Taxable and if the Item is Taxable and make the necessary tax calculation. For more information about Sales Tax in QuickBooks refer to Intuit Support.
Error: The Transaction Sales Tax field cannot be left blank, even for non-taxable customers and sales which have no taxable items in QuickBooks. - This error occurs because QuickBooks requires an Item Sales Tax Code on the transaction
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