Understanding Australia's Personal Income Tax Plan
The seven-year Personal Income Tax Plan, announced in May 2018, spreads tax relief across three distinct stages. Stage 1 (2018/19) adjusted rates and offsets for lower and middle-income earners. Stage 2 (2020/21 onwards) significantly raised income thresholds for the 19%, 32.5%, and 37% brackets and introduced the Low Income Tax Offset (LITO) at $700. Stage 3 (2024/25 onwards) consolidates the 32.5% and 37% rates into a single 30% rate and further increases the top threshold.
Remember that Australian financial years run from 1 July to 30 June. Tax cuts are typically implemented on 1 July each year. Understanding which stage applies to your tax year is crucial, as thresholds and offsets differ substantially.
How Australian Income Tax Is Calculated
Calculating your tax liability involves three steps:
- Determine taxable income: Start with assessable income (salary, wages, bonuses, investment returns) and subtract eligible deductions (work-related expenses, professional fees, depreciation). This gives your taxable income.
- Apply marginal tax rates: Use the relevant year's tax table. For example, income up to $18,200 is tax-free; income from $18,201 to $45,000 is taxed at 19%. Different thresholds apply in Stage 2 and Stage 3.
- Claim tax offsets: Reduce your tax bill by eligible offsets such as LITO (Low Income Tax Offset) or LMITO (Low and Middle Income Tax Offset). These directly reduce tax owed, not your income.
The order matters: calculate tax first, then subtract offsets to get your final bill.
Income Tax Calculation Formula
Australian income tax is calculated using marginal tax brackets. The formula depends on your taxable income and which stage applies. Below is the general approach for Stage 2 (2020/21):
Tax Before Offsets = (Tax on lower bracket) + (Rate × (Taxable Income − Threshold))
Total Tax Offsets = LITO + LMITO
Income Tax Due = Tax Before Offsets − Total Tax Offsets
Taxable Income— Your assessable income minus eligible deductions, calculated annually.Marginal Tax Rate— The percentage applied to income within each bracket (19%, 32.5%, 37%, or 45%).Tax Threshold— The income boundary at which a higher tax rate applies.LITO— Low Income Tax Offset: up to $700 for eligible earners from 2020/21 onwards.LMITO— Low and Middle Income Tax Offset: available until 2020/21, up to $1,080 for eligible earners.
Tax Rate Changes Under Stage 2 and Stage 3
Stage 2 (from 1 July 2020) raised thresholds for three brackets without increasing rates themselves. The 19% threshold moved to $45,000, the 32.5% threshold to $120,000, and the 37% threshold to $180,000. The tax-free threshold remained at $18,200, and the top rate of 45% remained unchanged.
Stage 3 (from 1 July 2024 onwards) is more substantial: the 32.5% and 37% rates are consolidated into a single 30% rate, effectively lowering tax for middle-to-high earners. The 45% threshold increases further to $180,000 and above, creating just four brackets instead of five.
These changes reduce bracket creep—the effect of inflation pushing wage earners into higher tax brackets—and provide genuine tax relief without reducing government revenue as dramatically as outright rate cuts.
Common Mistakes and Considerations
Understanding eligibility and timing prevents costly errors when filing your tax return.
- Confusing assessable income with taxable income — Assessable income includes all money earned (salary, bonuses, rental income, investment earnings). Taxable income is what remains after you claim deductions. Only taxable income determines your tax bracket and offsets. Work-related expenses, professional fees, and investment losses all reduce your taxable income.
- Overlooking offset eligibility and phase-out ranges — LITO and LMITO are not flat payments for everyone. Both offsets phase out (reduce) as income increases. At $45,000, LITO begins to reduce by 5% of income above that threshold. Over $66,667, LITO disappears entirely. Check the exact thresholds for your financial year to avoid overestimating your tax benefit.
- Forgetting that tax cuts are not always immediate pay rises — When thresholds increase, your employer may not adjust payroll tax withholding immediately or correctly. Verify your PAYG withholding matches your expected tax bill; you may request a variation if too much is withheld. Conversely, if too little is withheld, you'll owe a lump sum at tax time.
- Not accounting for Medicare Levy and other charges — The ATO also levies a 2% Medicare Levy (or higher for high earners) on top of income tax. This calculator shows income tax only; always factor in Medicare Levy and any applicable levies or surcharges to see your full tax bill.