Connex can add tax as a line item, if you have multiple tax rates in the same state. California charges different rates depending on the city and many e-commerce sites follow suit. If you charge a single rate for a state, Connex can use the QB POS tax rate.
How do I use the QB POS tax rate?
On the Connex configure page, uncheck add tax as a line item under the transaction tab. In this example, Connex will use the tax rate 6.25% for all Massachusetts orders:
Can I map different tax rates from QB POS to my orders?
Connex can map sales tax by county or by city. Leave tax as a line item unchecked. On the left of the configure page, click sales tax and add codes. Here is an example mapping of Middlesex County and Massachusetts: