QuickBooks Online 2021 setup sales tax. Let’s get into it with Intuit QuickBooks Online 2021. Here we are in our get great guitars practice file we’re going to be discussing turning on and setting up the sales tax. Before we do, let’s just recap the sales tax and how it will be working so that the setup will make more sense as we go through it. When we apply the sales tax, it’ll be on a sale.