Decision addresses how income should be treated when evidence does not show when it was earned
The High Court has dismissed an appeal by a youth allowance recipient, ruling that where a decision-maker cannot determine when ordinary income was earned or derived, the income must be taken into account in the fortnight in which the decision-maker is satisfied it was received.
In Chaplin v Secretary, Department of Social Services [2026] HCA 22, the court held that the Social Security Act required decision-makers to account for ordinary income in the earliest fortnight in which they could be satisfied that the income had been earned, derived or received.
The appellant received youth allowance between July 2014 and June 2015 while working casually at a grocery store. He was paid weekly, and his payslips recorded only aggregate hours worked and aggregate income received. The payslips did not identify the days on which he worked, making it difficult to match his earnings to the fortnightly instalment periods used to calculate youth allowance payments.
The appellant also mistakenly reported his net income rather than his gross earnings. Information obtained from the Australian Taxation Office in 2019 revealed that his gross income exceeded the amounts he had reported.
The respondent, the Secretary of the Department of Social Services, determined that the appellant had been overpaid youth allowance and notified him that he owed a debt to the Commonwealth. The matter proceeded through internal review and the Administrative Appeals Tribunal before reaching the Federal Court and, ultimately, the High Court.
The central issue was the proper interpretation of point 1067G-H23 of the Youth Allowance Rate Calculator in the Social Security Act. The provision states that ordinary income is to be taken into account in the fortnight in which it is first earned, derived or received.
The appellant argued that income could not be considered at all if the decision-maker could not determine the fortnight in which it had been earned. The respondent contended that the income should instead be allocated to the fortnight in which it was received.
The High Court accepted the respondent’s interpretation. The court said the legislation required ordinary income to be taken into account and did not permit known income to be disregarded simply because the precise earning period could not be identified.
The court held that a decision-maker who is satisfied that income has been received, but cannot determine when it was earned or derived, must account for the income in the fortnight in which receipt of that income can be established.
Because the Administrative Appeals Tribunal would have reached the same result had it applied that approach, the High Court found that its earlier error of law was immaterial. Ultimately, the court dismissed the appeal, with each party ordered to bear their own costs.
Legal Aid NSW said the decision confirmed that the Department of Social Services has lawful methods for calculating debts affected by income apportionment. The organisation said the case also highlighted the need for stronger safeguards in the social security system and reiterated its support for the Robodebt Royal Commission's recommendation of a six-year limitation period on social security debt recovery.
