If the Secretary is not satisfied as mentioned in section 16, 17 or 18, the Secretary must determine:
(a) if the determination is on a claim for payment of family tax benefit by instalment--that the claimant is not entitled to be paid family tax benefit for each day on which the determination is in force; or
(b) in any other case--that the claimant is not entitled to be paid family tax benefit for the past period or because of the death of the other individual, as the case requires.