tax is a complex issue for developers with most seeking their accountant's advice on how best to handle GST. For those who enjoy the detail, GST is payable on the finished product and is calculated at either one-eleventh of the sale price or one-eleventh of the difference
between the margin scheme base value (i.e.
usually the site purchase price) and the end
sale price. GST on development costs is claimed throughout the project regardless of which approach is used.
Because we're attempting a basic, early stage feasibility, most would agree that GST claimable on costs and GST payable on your sales can be left out of the numbers for now.