No worries, @skyemb. I've got your back to help handle with your customer showing a negative opening balance.
There are two ways to remove the customer's negative balance in QuickBooks Online. You can either issue a refund or show there is a Sale to which it is applied.
Here's how to show a sale:
- Log in to your QBO account.
- Select + New in the left panel and click Receive payment.
- Choose a customer, then select the invoice and the credit.
- Lastly, click Save and Close.
To know more about the detailed process and how overpayment works in QuickBooks Online, please review this resource: Handle a customer credit or overpayment in QuickBooks Online.
You may also read this reference that'll allow you to share a document showing all business activities made by a certain customer: Create and Send Customer Statements in QuickBooks Online.
If there's anything else that I can help you with aside from understanding the negative balance of your customer, please let me know the comments below. I'll be here ready to lend a helping hand. Have a good one!
