Hello ysong17,

You can set the Out of Scope tax code for your expenses if your not registered for BAS at the moment. Out of Scope tax codes will not be reported in your BAS and will not calculate GST on your expenses. Let me guide you how to set your default tax code to Out of scope.

1. Click on the Settings icon.
2. Click on Account & Settings.
3. Click on Advanced tab.
4. Click the pencil icon under Accounting section.
5. Locate Default tax code selection and set to Out of scope.
6. Click on Save, and Done.

Once done, when you create your transactions in QuickBooks Online the transaction will set to Out of scope tax code.

As always you can drop a comment below if you have more questions about GST. The Community is here to help you.