I am having this same issue, and I added a custom sales tax rate for all invoices after speaking with a Quickbooks rep. It is calculating the sales tax correctly on the invoices, however, under the "Sales Tax Payable" or "Sales Tax Owed" on the main sales tax page, it is miscalculating the total sales tax due by 2.2%. Even though the invoices are calculating the sales tax correctly. This is very frustrating, and I am having to make multiple adjustments to the sales tax due. Can someone please help me figure out how to fix this???