Hi Ptonjalken,
It's good that your business issues invoices ahead of time. I can see how important it is for you to account for this current quarter while adhering to the rules set by the Canada Revenue Agency. QuickBooks is a powerful program that makes it easy to put your financials into focus using our advanced features.
Based on what you've described, it's important you're able to record your transactions the right way. I encourage you to reach out to an accounting professional for advice on how to best handle this situation. Doing this helps ensure your books are accurate. You can reach out to a QuickBooks certified accounting professional on our site using this link here. I'll also leave this question open in the Community so other members can chime in and share their advice. In the meantime, check out this helpful article with more info on how to: Create and apply credit memos or delayed credits in QuickBooks Online.
Feel free to ask questions below, I'm here to help.
