Account with zero balance still shows on my open invoice report

Welcome to the Community, @sheila70458. Customers with net zero balances in the A/R Aging Summary report are usually the result of an invoice that isn't linked to a payment or credit.

here's how to clear up the net zero balance:

1. Click the + New menu, then select Receive Payment.
2. Fill in the customer's name and leave the Amount Received field blank.
3. Enter the closing date you want to use for an invoice in your reports in the Payment Date.
4. Put a checkmark next to the invoice to be paid with the credit in Outstanding Transactions.
5. Put a checkmark next to the Credits, then click Save. 

There should no longer any zero balances shows in your invoice report. You can chack out this article to learn more about reconciling your transactions in QuickBooks Online.

Let me know if you need more help in managing your invoice and reports. I'll be there to assist you again.