From 1 July 2017, any property sold for $750,000 or more will require a clearance certificate to prove you are an Australia resident.

Previously, properties that sold for $2M or more were required to obtain a clearance certificate proving that they are not a foreign investor.  Otherwise, 10 percent of the purchase price would be withheld from the seller for the Austalia Taxation Office.

From 1 July 2017, any property sold for $750,000 or more must obtain the clearance or have 12.5 percent of the purchase withheld.

Source: Australian Taxation Office