The law governing powers of attorney (POA) is:

http://www.austlii.edu.au/au/legis/nsw/consol_act/poaa2003240/

There are essentially three types of POA:

* An ordinary POA which operates only whilst the principal has mental capacity and can be revoked by the principal by simply advising the attorney that the power is revoked (naturally this should be done in writing and the revocation can be registered in accordance with s.51 of the Act:

http://www.austlii.edu.au/au/legis/nsw/consol_act/poaa2003240/s51.html

* An enduring POA which can be revoked by the principal in the same way as an ordinary POA whilst the principal has mental capacity, but endures in the event the principal loses capacity.

* An irrevocable POA cannot be voluntarily revoked by the principal and endures after the principal loses capacity.

Additionally, in each case a POA can also be terminated by a court in various circumstances.

I trust the above assists your understanding.

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