When you buy a house or land you will need to pay an extra 7% in stamp duty to Revenue SA, and this is only refundable if you get your Pr visa within one year of paying the stamp duty. The best thing to do is ask for an extra long settlement with the vendor as this is when its paid. In our case we are building a house, so we purchased the land in May last year (when the PR approval time was 8-10 months!), and thankfully we got our PR with just 10 days to spare! So we get our 7% money back, we also had to pay $5,500 FIRB which is non refundable. Peter at Revenue SA is really helpful and happy to answer any questions we had along the way!