Will be interesting where this all ends up. I guess the argument centres around whether uber is providing the transport service, or just providing a service that links the driver to the passenger.
Thinking through the logic of this (and putting aside the discussion around that all taxis are required to pay GST) ...
Looking at it from a customer perspective, the customer is paying uber to provide a service to get from A to B. The invoice is issued by Uber, credit card statement logs vendor as Uber. If there any complaints, the customer deals with Uber. Irrespective of the arrangements Uber has in place with individuals to provide that service, IMHO GST should be levied on that service. Are the drivers employees or subcontractors? If employees they should be issued group certificates. If subcontractors then if they earn <$75K then they don't need to charge GST, but if they earn >$75K then they should charge GST to Uber, which should be treated the same as GST on any business input.
What are the GST arrangements on courier companies? When you think about it Uber is merely a courier company, that that organises and charges for delivery of packages from point A to Point B using a network of subcontractors. The main difference is that the packages are people, not physical packages (SLF if you like
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I'm all for Uber providing competition to the taxi industry. But I think it is morally wrong that these services be considered exempt from GST.