kullafullsnake, it depends if you are registered for GST. If you are not, you do not charge GST. If you are registered for GST, you must charge it. If you are not registered for GST and you resell an item without gst, the purchaser cannot claim the gst component back, whereas if you are gst registered and you have to charge GST, the buyer can then claim gst back if it was for business use of course.
Situation 1 - you are registered for GST: Your supplier charges you $11 inc gst for an item. You then resell an item for $22 which includes GST. If they buyer purchased it as a business expense, they can claim $2 back on their BAS, if it was sold to an end user not for business, they still have paid the $2 gst but can't claim it back.
Situation 2 - you are not registered for GST: Your supplier charges you $11 inc gst for an item, you resell for $22 with no gst added. If the buyer was a business, they cannot claim the $2 back as an expense as your price did not include GST.
I think the most important thing we need to know is if you are registered for GST and reselling the product.