Hamilton and Commissioner of Taxation (Taxation)

The applicant, Mr Hamilton, sought to claim an exemption from Australian income tax on income derived from assignments with the International Monetary Fund (IMF). The Commissioner of Taxation disallowed this claim, and Mr Hamilton appealed to the Administrative Appeals Tribunal. Deputy President Bernard J McCabe P of the Tribunal affirmed the Commissioner's decision.

The primary legal issue before the Tribunal was whether Mr Hamilton's income from his appointments as a Revenue Administration Adviser for the IMF was exempt from Australian income tax under the relevant legislation. This required determining whether Mr Hamilton held an "office" within an international organisation or specialised agency for the purposes of the *International Organisations (Privileges and Immunities) Act 1963* (Cth), and whether his specific role and the nature of his assignments met the criteria for such an exemption.

The Tribunal applied the principles established in *Jayasinghe v Commissioner of Taxation*, which outlines a two-tiered test for determining if an individual holds an office in an international organisation for the purposes of tax exemption. This test involves both positive and negative criteria. The Tribunal found that Mr Hamilton's engagements, while providing advice to member states, were short-term contractual assignments. He was placed on a roster of experts and engaged for specific, limited periods. The Tribunal concluded that these engagements did not constitute holding an "office" in the IMF in a manner that would attract the tax exemption, distinguishing his situation from that of a permanent official. The IMF's own categorisation of Mr Hamilton as an "official" was not determinative for the purposes of the *International Organisations (Privileges and Immunities) Act 1963* (Cth), particularly as the IMF appeared to treat "officials" and "employees" synonymously, which was inconsistent with the High Court's approach in *Jayasinghe*.

Consequently, the Tribunal affirmed the objection decision, holding that the income derived by Mr Hamilton from his IMF appointments was not exempt from Australian income tax in the 2018 income year.