Judgment of the Court (First Chamber) of 8 September 2005 in Case C-288/04, Reference for a preliminary ruling from the Unabhängiger Finanzsenat, Außenstelle Wien, AB v Finanzamt für den 6., 7. und 15. Bezirk (Protocol on the Privileges and Immunities of the European Communities — Staff regulations — Conditions of employment applicable to other servants — Local member of staff at the representation of the Commission in Austria — Tax treatment)