GST stands for "Goods and Services Tax. " It's a consumption tax that applies to the sale of either physical or digital products.GST registered businesses may claim GST incurred before registering for GST and also before incorporation provided certain conditions are met. How this tax is applied depends on the specific goods or service. Register for GST online through the Business Registration Service. You can use the same form to register for other taxes at the same time. Non-GST registered businesses are not allowed to charge or claim GST. If you are not registered for GST, make purchase order which will show all prices as GSTinclusive and make no mention of GST. The sale and lease of residential properties are exempt from GST. You don't include GST in the price if your product or service is GSTfree.