The taxable income threshold at which the top marginal income tax rate of 45 per cent begins to apply for an Australian resident individual in the 2025-26 financial year is $200,000.

**Working:**
Under the legislated Stage 3 tax cuts (as adjusted by the Treasury Laws Amendment (Better Off Off Tax Cuts) Act 2024), the tax brackets for resident individuals for the 2024-25 and subsequent financial years are:
*   $0 – $18,200: 0%
*   $18,201 – $45,000: 16%
*   $45,001 – $135,000: 30%
*   $135,001 – $200,000: 37%
*   $200,001 and over: 45%

The 45 per cent rate applies to income exceeding $200,000.

**Controlling Authority:**
The Australian Taxation Office (ATO), under the administration of the Parliament of Australia.