At this point, ReadyToShip is not Tax/GST aware.
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When ReadyToShip displays order data, either in an 'Invoice' or order detail screen we show a Tax component that is simply a calculation based on the order total. We calculate GST as 1/11th of the order total.
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​How do I choose whether to show GST or not on Invoices in ReadyToShip?

We offer different Invoice templates in the Settings area. 

Invoice templates are set for each store and we have GST and GST Exempt options.

For some instructions on this click here.
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