I'd be happy to show you how to change a paid invoice to an unpaid invoice in QuickBooks Online, @tinkermaledublin.
In order to have the invoice show as unpaid, the payment that was received needs to be deleted. Go as follows:
- Go to Sales and select the Customers tab
- Double-click the customer name and open the invoice.
- Click on the 1 payment hyperlink in the upper right-hand above the PAID payment status and hit the date.
- Pick More button at the bottom and press Delete.
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To learn more about recording partial payment, applying credits and depositing funds in QuickBooks, please see these links below:
Let me know if you have a follow-up question about your invoice status or any other QuickBooks concerns. I'm always here to assist. Keep safe.