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Income tax in Australia is the most important revenue stream within the Australian taxation system. Income tax is levied upon three sources of income for individual taxpayers: ''personal earnings'' (such as salary and wages), ''business income'' and ''capital gains''. Collectively these three sources of income tax account for 67% of federal government revenue and 55% of total revenue across the three tiers of government. Income received by individuals is taxed at progressive rates, while income derived by companies is taxed at a flat rate of 30%. Generally, capital gains are only subject to tax at the time the gain is realised. Income tax is collected by the Australian Taxation Office on belhalf of The Commissioner of Taxation. In Australia the financial year runs from 1 July to 30 June of the following year. Income tax is applied to the taxable income of a taxable entity. Taxable income is calculated, in a broad sense, by applying allowable deductions against the assessable income of a taxable entity. == History == Queensland introduced income tax in 1902 by the ''Income Tax Act of 1902''. Federal income tax was first introduced in 1915, in order to help fund Australia’s war effort in the First World War.〔(A brief history of Australia’s tax system Department of the Treasury )〕 Between 1915 and 1942, income taxes were levied at both the state and federal level.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Income tax in Australia」の詳細全文を読む スポンサード リンク
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