When duplictating a previous monthly invoice to the same customer and revising it for the current month, when i save it, the invoice shows "Paid in Full".

Hi there, Shanna.

When duplicating a paid invoice while turning on the Automatically Apply credits feature, any invoice you create for a specific customer with credits available will automatically be applied.

You'll need to ensure this is turned off so that if you duplicate an invoice, it won't be automatically applied.

Here's how:

1. Go to the Gear icon on the top-right part of the page.
2. Select Accounts and Settings.
3. Head to the Advanced tab and find the Automation section.
4. Toggle off the Automatically apply credits option.

After that, you'll need to remove the applied credits to that duplicated invoice to change its status to unpaid.

Here's how:

1. Go to Sales and click the duplicated invoice that has been marked as fully paid.
2. A window will appear on the right part of the page. Under the Invoice Activity section, look for the View payment text button and click it.
3. You'll be redirected to the transaction that has automatically paid that invoice. Ensure that it's unchecked to remove the payment.
4. Hit Save and close.

Besides that, you can also consider creating a recurring transaction in QuickBooks Online to create invoices or bills automatically in a time interval.

I'm always here to assist you if you have further concerns besides your concern with the duplicate invoice that has been marked as fully paid. Feel free to leave a reply below.