Let me point you in the right direction on how to correct your customer's record, staysmart.
A negative balance occurs if a customer pays more than the invoiced amount. In QuickBooks Online (QBO), you can create a credit memo, enter a refund receipt, and write a check or expense to clear up the balance.
However, the process is scenario-based. You can go over this article for more in-depth information: Record a customer refund in QuickBooks Online. From there, follow the steps that best fit your situation.
You can find more information on resolving net zero balances, managing delayed credits, and handling credit memos by browsing the following links:
You can go over these references to learn more about managing your income and other sales-related transactions:
Reach out to me again if you have clarifications about clearing your customer's balance or have other QuickBooks concerns. I'll get back to respond to them.
