For taxi fares you always have to bear in mind the different tariffs applying at different times, and, also, the different rates charged by private hire and public rank taxis.
However, regarding taxi fares and GST administration there is an interesting quandry... Most private hire taxi drivers are self-employed and pay the company a radio rental fee each week. As self-employed businessmen they would fall beneath the business threshold at which they would have to be paying GST and so shouldn't be charging it. Taxi companies do, however, directly employ a limited number of drivers and as employees of a company with a turnover high enough to register for GST they will be charging it... So, for private hire taxis there should be a 3% disparity in the fare depending on whether the driver is self-employed or employed by the company... Will this be the case??? Will it f*ck!
(And...overheard in the Lamplighter a couple of years ago... 'Taxi drivers?!? They're always late, they're rude and they charge too much! Who gives a f*ck about them?' The speaker? Guy de Faye 'relaxing' after a hard day at the office. This man could perhaps borrow the services of Frank's public relations service)