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Good to see you, @LAStax. I'll help you with recording refund.
When you record a refund using a Check, we have to make sure that we link it to the customer's credit or overpayment. You can follow these steps:
I've added this article for more details: Record a customer refund in QuickBooks Online. Once done, let's check again your accounts receivable to see the balance. Also, this link will guide you on how to refund a deposit and close an invoice.
Post again here if you have more questions. Thanks for dropping by.