This is definitely something worth confirming with your accountant before signing, especially because the purchase involves two titles and a possible subdivision or separate sale. I’d be careful about assuming that cosmetic renovations automatically make the house sale GST-free, or that selling the vacant block will necessarily attract GST simply because the title is separated. The outcome can depend on the property’s history, how the subdivision is carried out, whether the activity amounts to an enterprise, and the applicable GST rules for the sale. I’d ask your accountant to review both possible ownership structures and calculate the GST implications before you commit. Getting the details right at the start can save a lot of trouble later—rather like planning ahead in Slope, where one wrong turn can change the whole run.