I marked an invoice as paid but need to reverse this action

Hi, Fischercleaning. We can reverse the payment on the invoice accidentally marked as Paid by deleting the Receive Payment transaction. I'll show you two methods you can follow. 

The first method is to reverse the payment through the Invoice. Follow these steps:

1. Go to Sales, and then Invoices.
2. Find the invoice in question.
3. Click on the status of the invoice.
4. From the status window, click on View the payment.
5. Once you are in the payment transaction, click More at the bottom.
6. Select Delete and confirm the deletion.
7. This will unlink the payment and mark the invoice as unpaid.

Another method is by going through the Customers & Leads tab:

1. Go to Customers & Leads.
2. Click on the customer from the invoice.
3. Navigate to the Transaction List tab.
4. Filter the transactions to Invoices and set the status to Paid.
5. Select the invoice in question by clicking View/Edit.
6. Scroll down and click the payment link under Invoice Total.
7. This will lead you to the Receive Payment transaction.
8. Click More at the bottom, then select Delete.

By following these steps, you can effectively reverse the payment and accurately reflect the status of your invoice. 

For future reference, refer to this helpful article for processing customer payments: Record invoice payments in QuickBooks Online.

If you have further queries about managing your invoices, please feel welcome to reply in the thread. The Community is available around the clock to assist you.