The most common cause of an incorrect balance is a transaction error. To find out where an error may have occurred, view the customer's balance details.
Choose Customers > Customer Center.
On the Customers & Jobs tab, select the customer.
In the Show list select Balance Details.
(Optional) You can set the Filter by and Date lists to narrow the transaction list further.
Review the transactions.
Did you deposit a payment without recording it against an invoice?
Did you enter the wrong amount in a transaction?
Open the transaction and edit it. For example, you can edit an invoice or sales receipt or edit a credit.
Do you need to enter a credit?
Do you need to void or delete an invoice?
Do you need to enter an invoice?
We can't anticipate every balance-related question you might have, but don't worry. We can point you to the information you need to get the job done. You can:
Search the QuickBooks support site
Ask other QuickBooks users in the Intuit Community
Edit an invoice
Enter a statement charge
Apply a customer credit from one job to another job
Edit a customer credit