Hi there Stare,
Thanks for reaching out about reports for taxes. QuickBooks Online is a great tool with multiple reports to help you view the many aspects of your business's financials. I can provide some information about reports.
One report you could use would be the Transaction Detail by tax code report, located in the Sales tax section of the Reports tab. You can put a filter for a specific supplier by clicking on Customize, then Filter and Supplier. This will show all transaction lines for the supplier, separated by each tax code.
If you have any other questions, feel free to reach out here.
