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I wouldn't add GST on top of the mileage rate to begin with. It is exempt from GST. I am sure your customers would rather not pay an extra 15% even if they could claim it back later on.
Cheers
Peter
We work out the average operating costs which you can use to negotiate a reimbursement rate with your employer. We need to know the engine size of your Toyota Hilux to be able to supply you with the appropriate running cost.