How to cancel a customer invoice

Good day, @wescey. 

 You can cancel a customer's invoice by deleting it. I'd be happy to show you how:

1. In your dashboard, click the Sales tab.
2. Select Invoices.
3. Select the invoice you want to delete.
4. Click the More tab, then hit Delete.

I've also attached some articles you can use on how to send your customer's invoices and record payments:

• Different Ways to Send Invoices in QuickBooks Online
• Receive and Categorize Invoice Payments

Drop me a comment below if you have any other questions. Wishing you and your business success.