You can run the GST Summary and GST Details report in the GST center to see your GST and GST owed. Here's how:
If you've lodged the BAS for a specific period, you can go to To Do, and click on the drop down arrow and click on BAS Summary or BAS Details report too.
From there you will see the figures of your GST sales, purchases and owed.
You can also check this article to learn more about GST:
Feel free to reply on this thread if you have any other questions on your GST. Have a great day!
You can run a report called GST Summary Report which can be access by going to Reports tab or GST tab and select Run reports. Then you can change the Report period according to your preference.
For more information, feel free to check on this article: Check how much GST you owe in QuickBooks Online.
Let me know if you have any other questions by leaving a comment below.