How to Setup Tax Rates on Your Shopify Store
In the bottom left corner of your Shopify admin, click on Settings and then click on Taxes.
You’ll see a few different tax regions. Click the Set Up button next to the region you would like to configure.
Next, click on Add Tax Account and then select the region where you obtained your tax registration number from the dropdown menu. Enter your registration number and click Save.
You will now see that your tax rates have been applied and are no longer zero.
If any of the tax rates are not correct, you can override them by clicking on Add Tax Override. Shopify allows you to override tax rates by entering them manually.