QuickBooks has a unique rules for handling tax collection and reporting when 2+ taxes are being collected on a single invoice. They call it 'Tax Bundles' / 'Combined Tax Rates' (their rules not ours). Use the steps in this article to map corresponding multiple sales taxes on your Gazelle invoices to QuickBooks tax bundles.
What does this mean for syncing a single sales tax / VAT in Gazelle to QuickBooks?
Nothing, if you are only reporting a single sales tax / VAT on each of your invoices. However, if your governing tax agency requires you to collect 2+ taxes on transactions then you will need to follow the steps below:
How to set up Tax Bundles in QuickBooks.
Step 1: In QuickBooks to go Taxes > Add/Edit Tax Rates and Agencies > New > Create a combined tax rate for every combination of taxes you are required to collect.
Step 2: Map each individual tax in Gazelle to the individual corresponding tax in QuickBooks. NOTE: You will map your Gazelle taxes to the individual component tax in QuickBooks (not the Combined tax rate).
Step 3: Add 2+ taxes to your invoices in Gazelle as you have always done.
Step 4: Done! Sync with QuickBooks and you will be all set.
So long as the combination of taxes on your Gazelle Invoice exists as a 'Tax Bundle' (or a 'Combined Tax Rate') in QuickBooks, Gazelle will use QuickBook's API to map the individual taxes on your Gazelle invoice to the appropriate tax bundle in QuickBooks.