You can display the shipping tax as a separate line by following the simple steps below.
Unfortunately, this feature as a selectable option will be available for future releases of Simple Invoice.
After you set up your taxes correctly, please create a support ticket.
You can get more information about location-based taxes from the official Shopify guide by clicking here.
Step 1: Open Simple Invoice from your Shopify store’s “Apps” section.
Step 2: Click on “Support” on the Simple Invoice dashboard, add your message such as where you want us to print in your invoices, and click the Send button or simply click here.