(1) The Commissioner may, by notice to a person who is to lodge a return under a taxation law, exercise one or both of the following powers:
(a) extend the time for lodging the return;
(b) vary the period to which the return is to relate.
(2) An extension or variation under this section:
(a) takes effect on, or from, a date specified in the notice; and
(b) is subject to conditions stated in the notice or in a later notice given to the person to whom the extension or variation relates.