In South Australia, under section 104 of the Stamp Duties Act 1923 (SA) mortgage duty was abolished from 1 July 2009.

A mortgage dated on or after 1 July 2009 can be registered at the Land Titles Office unstamped.

A caveat which refers to another document, eg an agreement, charge etc, is liable to mortgage duty if that document is dated prior to 1 July 2009.