We recently migrated to QBO from Desktop. When we migrated, a number of the old invoices are not marked unpaid. What is the best way to fix.

Welcome to Community, alvaallen3.

I can help fix this issue with invoice showing unpaid instead for paid in QuickBooks Online (QBO).

Let's review the applied payment to all the invoices and ensure that the Receive Payment transaction is linked to the invoice. If not, we can delete this and apply the payment to the right one.

Here's how:

1. Go to the Sales menu from the left menu.
2. Select Invoices, and choose the invoice to open it.
3. Under Payment Status, click the 1 payment link and click on the Date hyperlink.
4. Choose the More tab and choose click Delete.
5. Select Yes to confirm.

Once done, enter the payment again to the correct invoice. For your reference, simply follow the steps and details in this article: Record an invoice payment.

If an Bank Deposit is used to record the invoice payment instead of Receive Payment, we need to link them to an invoice. This will mark the transaction as paid. You may refer to this resource as your guide: How to link a deposit to an invoice.

Learn more about what can and cannot be imported when switching from QuickBooks Desktop to QuickBooks Online: What to expect when you switch from QuickBooks Desktop to QuickBooks Online.

We have easy-to-access articles, webinars, and video tutorials that will help you in familiarizing the different tasks, features, and functions of QBO. Below are the following:

• All QuickBooks Tutorials.​
• QuickBooks Webinars.
• Help Articles.

Get back to me if you need further help while working with QuickBooks Online invoices. Have a nice day.