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Hi there, @hblangers1.
Yes, you can mark the paid invoice to unpaid. This will re-open the invoice's status in QuickBooks. I'll guide you how:
I've added a screenshot for visual reference.
To learn more about receiving payments and applying credits in QuickBooks Online, please see these links below:
Let me know if you have a follow-up question about your invoice status or if you have any other concerns, by leaving a comment below. I'm always here to assist.