The GST is a great State tax as it is proportional to the size of the economy and is used to fund State government services which are a fairly stable portion of economic activity. 
 
Another great tax is Land Value Tax as the primary driver of the value of residential, commercial, retail and industrial land is the public and private services available to the occupants. If it wasn't, why is Sydney Harbour land so much more valuable than the equally beautiful Hawkesbury?? A single rate Land Value Tax, with no tax free threshold, for all land described above should replace all other property and contract transaction charges (Farm and mineral lands should have another type of Value tax applied to them.  
 
For economic efficiency, people should be paying for expensive government services, like public transport, roads, schools, provided to them, whether they use them or not. Police, ambulance, hospitals, fire services and other services are effectively on standby in our region. If we all had quarter acre block each of these services would cost much more to deliver. Therefore all residential, commercial, retail and industrial land should be taxed on the value of the land. The transaction to buy and sell land will then be very cheap - making it much cheaper for people to switch to land/apartments that best suits their needs. 
 
We can justify excise taxes on fuel, alcohol and tobacco because of the transport and health services they more than pay for. When most of us are driving cars powered by cheap/free solar electricity, another way will need to be found to fund roads - a kilometre toll of every kilometre travelled??? 
 
Of course we need Income Tax to also fund services and support payments, but 95% of the tax act should go as most of it is all about business tax deductions of some sort - then tax rates would be lower. 
 
Four very different taxes - GST, Land Value, Excise and Income taxes are all we need for an efficient economy, provide opportunities in life for us all and is fair to the less well off in our society.

Mike--Congratulations on getting mountain bikes bush bashing. But what will the riders do to those equestrians they meet on multi-use trails? We equestrians fought long and hard to keep open to horses tracks through Garrigal and Ku-Ring-Gai Chase National Parks. When Carr was National Parks Minister under Wran, he wanted to exclude all horses. National Parks even tried to get horses to wear nappies. I first had a letter published on the topic in May 1984. A couple of years ago, National Parks reconstructed a major trail (Neverfail) and invited all local equestrians to a formal opening an barbie by Mona Vale Rd. They had learnt the adage about flies (horseflies?) and honey. Will your bikies be willing to share those lovely trails, when not closed on Total Fire Ban days, with not only bushwalking pedestrians but also trail-riding equestrians of all abilities?