A subsidy certificate:
(a) comes into force on the day stated in the certificate; and
(b) stops being in force at the earliest of the following times:
(i) if subsidy becomes payable to the person who holds the certificate--immediately after the end of the first authorisation day for the subsidy;
(ii) if the certificate is cancelled under section 25--at the time of cancellation;
(iii) in any other case--12 months after the certificate was given.