Thank you! So then one last point of clarification. If, instead of the scenario stated, what if the customer overpaid an invoice.
So we have a customer that paid (according to the check stub) for an invoice that didn't exist. I did as suggested above, and created a credit memo for the excess amount. The same customer, on a second check, overpaid an invoice (paid $7500 instead of $75.00). I have paid the invoice exactly as they indicated, and the invoice now shows a balance of $-7425. In this case, am I correct in assuming that this balance (because it is attached to an actual invoice) will display on the customer statement as a negative amount? And if so, it can be "paid" and in effect applied to other invoices? If so, there would be no need to create a credit memo or anything else, correct?
Yes, you don't need to create a credit memo since QuickBooks will record the balance as a negative amount, dLearned.
You can use the balance for the next invoice. If you want to automatically apply the overpayment to future invoices, you can tell QuickBooks to automatically use it.
Let me show you how:
- Go to Settings ⚙ and select Account and settings.
- Proceed to the Advanced tab.
- Click Edit ✎ in the Automation section.
- Mark Automatically apply credits.

- Select Save, then Done.
Some customers prefer getting a credit they can use to reduce the balance on their next invoice. If they simply want a refund, here's how to return their payment.
Stay in touch with me if you more help with managing customer's overpayments. I'm always right here to help you.