No. It is no longer necessary to stamp a trust deed in South Australia.
However, people often still stamp the deed as ‘nil’ duty payable. Why?
They do this for a number of reasons, including to act as third party proof of when the trust was first established, and to satisfy third parties that the trust has been property established, such as banks, share brokers, and other financial institutions (that are often still reluctant to abandon old habits!).