What report should I use to determine those suppliers not paid by end of financial year?

You can pull up the Supplier Balance Detail report, johnr2. This way, you'll be able to view the complete list of supplier's unpaid bills by the end of a financial year.

QuickBooks Online offers a variety of reports to monitor your business growth and expenses. The Supplier Balance Detail report displays the total amount you owe for each supplier. You can customize its Report period to view the accurate details. Here's how:

1. Go to the Reports menu.
2. Type in Supplier in the search box, then select Supplier Balance Detail.
3. Click the Customise button.
4. Set the Report period to the date of your financial year.
5. Select the Rows/Columns drop-down to update the columns in the report.
6. Choose Filter to select the specific details you want to view.
7. Click Run report.

Once done, you can memorise the Supplier Balance Detail report to save its current customisation settings. For the detailed steps, kindly refer to this article: Memorise reports in QuickBooks Online. It also contains information on how to set a schedule and add the memorised report to a group.

Please let me know if you have other concerns. I'm just around to help.