That $20,000 loss is real, that money is gone, the government doesn't refund you any of that loss.
Not all of it, the depreciation schedule is just smoke and mirrors. A house remains livable well beyond the time frames used in the schedule.
Look at this chart http://reiwa.com.au/Research/Pages/Perth-house-price-chart.aspx prices didnt crash when Keating got rid of NG and didnt take off when it came back. So clearly NG tax deductions have very little impact.
But to me they have now formed what looks like a big bubble that followed the demographics and easy credit, and the rush of investors now just might be the last big push. Where will the buyers come from once the mum and dad investors are hocked up to the eyeballs with 90% LVR's?