Originally Posted by ajnz

... Cabcharge does charge 10% service fee + 10% GST on the service fee, because it used to confuse me no end when trying to reconcile Australian cab charges on a NZ credit card.

The biggest problem was when a manual transaction ('zip-zap') was done, and the total written on the receipt was eg $40, but the amount that hit my CC was $44.40. I contested a whole bunch of charges until I discovered the very small print on the paper which said "10% + 10% GST". ...