Australia uses a progressive tax system — the more you earn, the higher the rate you pay on each extra dollar. But here's the key word: progressive means only the income in each bracket gets taxed at that bracket's rate, not your entire income. If you earn $90,000, you are NOT paying 32.5% on all of it. Think about what that actually means in dollars before we apply any numbers — and think about why a government might design a tax system this way rather than just charging everyone the same flat percentage.
Type your initial response below — you will revisit this at the end of the lesson.
Write your initial response in your book. You will revisit it at the end of the lesson.
The 2024–25 Australian income tax brackets and how to read them
That Medicare levy = 2% of taxable income, added separately
The formulas for tax refund and tax debt
Understand
Why the marginal rate applies only to income above the bracket threshold
Why effective tax rate is always lower than the marginal rate
How PAYG withholding is reconciled against actual tax liability at year end
Can Do
Calculate income tax from a tax table for any taxable income
Add Medicare levy to find total tax liability
Determine whether a worker receives a refund or owes a debt, and by how much
Misconceptions to Fix
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Wrong: Income tax is calculated using a single flat rate for all income.
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Right: Australia uses a progressive tax system with marginal tax rates. Different portions of income are taxed at different rates, not the entire amount at one rate.
Core Content
Key Terms
Progressive TaxA tax system where higher income earners pay a higher percentage of their income in tax.
Marginal Tax RateThe rate of tax applied to the last dollar earned within a particular tax bracket.
Tax BracketA range of income that is taxed at a particular rate.
Tax PayableThe total amount of income tax owed to the government before offsets.
Tax OffsetA direct reduction in the amount of tax payable, such as the low income tax offset.
How Progressive Tax Brackets Work
In a progressive tax system, each portion of income is taxed at a different rate — higher rates apply only to the income within that bracket, not to total income.
The 2024–25 Australian income tax brackets for residents are shown below. The base amount is the total tax already accumulated at the bottom of the bracket. You add to it the marginal rate applied only to income above the bracket's lower threshold.
Tax on this income
Column B
Each bracket is taxed at its own rate. The marginal rate is NOT applied to the whole income.
Always use the taxable income figure, not gross income: The tax table is applied to taxable income (after deductions). Using gross income gives a higher — and incorrect — tax figure.
Common error — The marginal rate applies only to income above the threshold: A taxable income of $70,000 is in the $45,001–$120,000 bracket. Tax = $5,092 + 0.325 × ($70,000 − $45,000) = $5,092 + $8,125 = $13,217. The 32.5% rate applies only to the $25,000 above $45,000 — NOT to the full $70,000.
Medicare Levy
The Medicare levy is an additional 2% charge on taxable income that funds Australia's universal health system — it is added on top of income tax to find total tax liability.
Most Australian taxpayers pay a Medicare levy of 2% of their taxable income. The total tax liability is:
Add Medicare levy after calculating income tax — as a separate step: Calculate bracket tax first, then add 2% of taxable income. Do not include it in the bracket calculation.
Common error — Medicare levy is 2% of taxable income, not of tax payable: A common error is applying 2% to the income tax figure rather than to the taxable income. For a $70,000 income: correct Medicare = $70,000 × 0.02 = $1,400; incorrect = $13,217 × 0.02 = $264 — a very different result.
Insight — Effective vs marginal rate: For a $70,000 income, the marginal rate is 32.5% but the effective rate (total tax ÷ taxable income) is only 20.9%. This is the difference between the rate on your last dollar earned and the average rate across all your income — they are never the same in a progressive system.
Tax Refund or Tax Debt — Reconciling PAYG
At the end of each financial year, Australians lodge a tax return comparing what was withheld by their employer against what they actually owe — the difference is either a refund or a debt.
Throughout the year, employers withhold PAYG tax from each pay packet and send it to the ATO. This is an estimate — it may be more or less than the actual tax liability. The reconciliation process:
Action
Column B
The direction of the comparison determines whether it's a refund or a debt.
State whether the outcome is a refund or a debt — and by how much: Don't just write a number. Write "Tax refund of $X" or "Tax debt of $X." The conclusion earns a mark in extended response questions.
Common error — Compare PAYG to (income tax + Medicare levy), not income tax alone: The comparison is always: PAYG withheld vs total tax liability (income tax + Medicare levy combined). Forgetting to include the Medicare levy before comparing understates the liability.
A Reliable Strategy for Tax Table Questions
Tax questions feel intimidating because the table looks formal, but the process is actually very repetitive once you know the order.
Find the correct bracket for the taxable income
Write the base tax amount from the table
Subtract the lower threshold from the taxable income
Apply the marginal rate only to that excess amount
Add the base amount and marginal component
Then calculate Medicare levy separately
Exam technique: Write the bracket first, for example "$84,000 is in the $45,001–$120,000 bracket." That one line often prevents students from using the wrong base amount or threshold.
Reasonableness check: If your tax payable is more than the taxable income, or if the Medicare levy is only a few dollars on a high income, something has gone wrong in the setup.
Worked Examples
Worked Example 1Full Tax Calculation — Refund
Problem
Zara has a taxable income of $67,500 for the 2024–25 financial year. Her employer withheld $14,980 in PAYG tax. Calculate: (a) income tax payable, (b) Medicare levy, (c) total tax liability, and (d) whether she receives a refund or owes a debt, and by how much.
Solution
1$\$67{,}500 \text{ falls in the } \$45{,}001\text{–}\$120{,}000 \text{ bracket}$Identify the correct bracket from the tax table
3$\text{Medicare levy} = \$67{,}500 \times 0.02 = \$1{,}350.00$2% of taxable income — separate from bracket tax
4$\text{Total tax liability} = \$12{,}404.50 + \$1{,}350.00 = \$13{,}754.50$Income tax plus Medicare levy
5$\$14{,}980.00 > \$13{,}754.50 \implies \text{Refund} = \$14{,}980.00 - \$13{,}754.50 = \$1{,}225.50$PAYG withheld exceeds liability — Zara receives a refund of $1,225.50
Worked Example 2Tax Debt Outcome
Problem
Marcus has a taxable income of $112,000. His PAYG withheld for the year was $28,100. Calculate his total tax liability and determine whether he has a refund or debt.
Solution
1$\$112{,}000 \text{ falls in the } \$45{,}001\text{–}\$120{,}000 \text{ bracket}$Identify the correct bracket
3$\text{Medicare levy} = \$112{,}000 \times 0.02 = \$2{,}240.00$2% of taxable income
4$\text{Total tax liability} = \$26{,}867 + \$2{,}240 = \$29{,}107.00$Income tax plus Medicare levy
5$\$28{,}100 < \$29{,}107 \implies \text{Tax debt} = \$29{,}107 - \$28{,}100 = \$1{,}007.00$Liability exceeds PAYG — Marcus owes the ATO $1,007
Worked Example 3Full Question — Income to Refund/Debt
Problem
Priya earns $82,600 salary and $1,200 in bank interest. Her allowable deductions total $2,850. Her PAYG withheld was $19,400. Calculate her tax refund or debt.
Solution
1$\text{Gross income} = \$82{,}600 + \$1{,}200 = \$83{,}800$Sum all assessable income
6$\$19{,}400 > \$18{,}394.75 \implies \text{Refund} = \$19{,}400 - \$18{,}394.75 = \$1{,}005.25$Priya receives a tax refund of $1,005.25
Worked Example 4Bracket Boundary Check
Problem
Ella has a taxable income of $45,000 exactly. Her PAYG withheld for the year was $5,900. Calculate her income tax, Medicare levy, total tax liability, and whether she receives a refund or owes a debt.
Solution
1$\$45{,}000 \text{ is at the top of the } \$18{,}201\text{–}\$45{,}000 \text{ bracket}$Use the 19c per dollar over $18,200 rule
2\text{Income tax} = 0.19 \times (\$45{,}000 - \$18{,}200) = 0.19 \times \$26{,}800 = \$5{,}092.00This matches the base amount for the next bracket
3\text{Medicare levy} = \$45{,}000 \times 0.02 = \$900.002% of taxable income
4\text{Total liability} = \$5{,}092 + \$900 = \$5{,}992.00Income tax plus Medicare levy
5\$5{,}900 < \$5{,}992 \implies \text{Tax debt} = \$5{,}992 - \$5{,}900 = \$92.00PAYG withheld is slightly less than total liability
Revisit Your Initial Thinking
Look back at what you wrote in the Think First section. What has changed? What did you get right? What surprised you?
Check Your Understanding
Checkpoint Questions
Select the best answer for each question. Feedback appears after you choose.
MC
Multiple Choice
5 random questions from a replayable lesson bank — feedback shown immediately
B) $16,900.00
C) $6,422.00
D) $5,092.00
A is correct. $52,000 is in the $45,001–$120,000 bracket. Tax = $5,092 + 0.325 × ($52,000 − $45,000) = $5,092 + $2,275 = $7,367. Option B applies 32.5% to the full $52,000 (no base, no threshold); C applies the 19% bracket instead; D gives only the base amount without the marginal component.
A taxpayer's income tax is $18,450 and their taxable income is $84,000. What is their total tax liability including Medicare levy?
A) $18,819.00
B) $20,130.00
C) $19,137.00
D) $17,061.00
B is correct. Medicare levy = $84,000 × 0.02 = $1,680. Total = $18,450 + $1,680 = $20,130. Option A applies 2% to the income tax figure instead of taxable income ($18,450 × 0.02 = $369 added); C uses an incorrect Medicare levy; D subtracts Medicare levy instead of adding it.
A taxpayer's total tax liability is $22,640. Their PAYG withheld was $21,980. Which statement is correct?
A) They receive a refund of $660
B) They owe a tax debt of $660
C) They receive a refund of $22,640
D) No refund or debt — they break even
B is correct. Tax liability ($22,640) > PAYG withheld ($21,980) → tax debt of $660. Option A reverses the comparison (treats it as a refund); C is the liability itself, not the difference; D ignores that the two figures are different.
A taxpayer has taxable income of $45,000. What is their Medicare levy?
A) $90
B) $509.20
C) $900
D) $1,800
C is correct. Medicare levy = 2% of taxable income, so $45,000 × 0.02 = $900.
Written Response Practice
These questions focus on setting up the bracket calculation cleanly and finishing with the correct refund/debt conclusion.
Short Answer 1
A taxpayer has taxable income of $60,000. Calculate their income tax payable before Medicare levy.
Bracket: $45,001–$120,000
Income tax: $5,092 + 0.325 × ($60,000 - $45,000)
$= $5,092 + $4,875 = $9,967.00
Short Answer 2
A taxpayer has taxable income of $72,000. Their PAYG withheld for the year was $15,600. Calculate their total tax liability including Medicare levy, and determine whether they receive a refund or owe a debt.