hey guys thanx for all your replies.
well i spoke it over with the dealership, and an accountant and a manager of a cracker factory and the conclusion is... YES i do have to pay for GST. its because after 60 months there are 2 options. pay the risidual value off and own the car or forfeit the car. paying residual value is the same as purchasing the car so GST will be included. well thats how it went down. we lost and the tax dept went home smiling. i could of used the money for sumthin more important too...