Yes, there's a report you can run in QuickBooks Online which provides a summary of your sales by tax agency and sales tax code, BillG21. Here's how:
- Go to the Reports menu.
- Under the Sales tax section, choose Sales Tax Liability Report.
- Set the correct report period and tax agency.
- Click Run report.
You'll see the summary under the Gross Total column. Take a look at the screenshot below.

Additionally, consider utilizing this article for more detailed information about this report: Understand the sales tax liability report in QuickBooks Online.
Moreover, the software has features that allow you to customize your reports to meet your business needs.
If you need more help managing your reports, revisit this thread or open a new one. We're here to provide the support you need.