Welcome and thank you for taking the time to reach out to us here on the Community page, @stuartbhood.
You can delete the payment that was linked to an invoice to re-open the invoice again.
Here's how:
- Open the invoice that was marked as paid.
- Click on the payment link under the Payment Status section.
- Hit the date link to open the payment.
- Tap on the More button beside Print, then select Delete to remove the payment.
I've added these screenshots for your visual reference.
![l5 1.PNG l5 1.PNG](https://quickbooks.intuit.com/learn-support/image/serverpage/image-id/40147i4A9A60DA5EB6DE64/image-size/large?v=v2&px=999)
![l5 2.PNG l5 2.PNG](https://quickbooks.intuit.com/learn-support/image/serverpage/image-id/40148i309B759B5A1BC079/image-size/large?v=v2&px=999)
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Let me know if there's anything you need assistance with. I'm always here to help. Have a good day!