QuickBooks Online 2021 applied customer deposit or credit to an invoice. In other words, we got a pre payment from a customer in the past which we will now apply in the format of a credit to the invoice that we will create to complete the sale complete the transaction. Let’s get into it with Intuit QuickBooks Online 2021. Here we are in our get great guitars practice file, we’re now going to be creating an invoice for a customer who made a deposit in the past. Let’s first open up our financial statements, we’re going to right click on the tab up top and duplicate it.