Stamp duty, registration & GST.
Pick where you are buying, enter the property value (the higher of your price and the government guidance value), and see the true all-in cost of acquiring it, including GST for under-construction property. Runs privately in your browser; figures are indicative.
GST applies only while a property is under construction. Ready homes and plotted land carry no GST.
How this is calculated
When the numbers work, see the address.
The maths is the easy part. Walk the site, check the approvals and ask the founder’s team anything; a named person replies, usually within a couple of hours.