I just looked up the ACCC site and this is what is stated there..
Not trying to nit pick as I am a loyal client Chris, but it is better to be safe than sorry what with all of the unsavory types on the net these days just dying to put the boot into a legitimate business!
GST and the internet
Displaying prices on a website selling to export and domestic consumers
Such a website can display a GST-exclusive price for customers outside Australia. But the website will need to display the GST inclusive price for Australian residents.
Business consumers
If a price list is exclusively for business consumers and the established practice has been to list sales tax exclusive prices this may continue as long as it is clear that GST has not been included.
As business customers will be able to claim input tax credits for the GST they pay, a GST-exclusive price may more accurately reflect the cost of supply to that business.
Export-only sales
If a business exports only, GST-exclusive, export-only prices can be displayed on the website.
It should be made clear that the price does not include GST so that any potential domestic customers are not misled.
For more detailed information
Other GST information can be found in Related topics.
Contact the Australian Taxation Office in your state or territory (see Other agency contacts in Related documents).
http://www.accc.gov.au/content/index.phtml/itemId/255377/fromItemId/8135