Hi janet85,
Welcome to Community! QuickBooks Online provides the reports you need to ensure you're sales tax is accurate. When the report doesn't contain any data, this can be rather concerning. I'd be happy to help!
Initially, I suggest opening the GST/HST Detail report and review the Report period, to ensure it includes all transactions within the desired timeline. In addition, you'll want to check the Accounting method for the report and hit Run report. If there still isn't any data in the report, I recommend reviewing the Transactions without sales tax report, with the same Report period and Accounting method. If the sales tax hasn't been recorded properly on the transactions, you can use this report to make any necessary changes, as you see necessary.
If you experience the same outcome, please contact us for direct assistance in real time.
Feel free to reach out again, if you have any other questions. We're here for you!