If payments are already marked as sales and reconciled, how can I match them to an invoice to close it? I do not want to double the sale.

Thanks for reaching out to us in the Community, @kristi7116.

I'll help you match your invoices to your downloaded banking transactions in QuickBooks Online (QBO).

Since your downloaded payments are already reconciled, you'll have to undo your entire reconciliation period. This way, you can start fresh and match your invoices. 

Let me show you how:

1. Go back to the Gear icon at the top, then pick Chart of Accounts under Your Company column.
2. Locate the appropriate account for the transaction and select View Register on the Action column.
3. Identify the transaction to edit.
4. In the reconcile status column (indicated by a checkmark), repeatedly click the top line of the transaction to change the status, then Save.

• C - Cleared.
• R - Reconciled.
• Blank - Not cleared or reconciled.

Once done, you can match the downloaded payments to the ones you've entered in QuickBooks. 

If you have an accountant who has a QuickBooks Online Accountant (QBOA) account, you can ask them to undo your entire reconciliation. They have a special tool that can unreconcile transactions in just a few clicks. 

For your reference, you can also check out this article for further guidance: How to undo a reconciliation.

That should do it! Let me know how it goes by leaving a comment on this thread. I'd be glad to answer if you have any follow-up questions or concerns. Take care and have a good one.