How Australian Income Tax Brackets Work: A Beginner's Guide

Plenty of Australians believe that moving into a higher tax bracket can leave them worse off. It almost never does. Here is how the brackets really work, and what sits on top of them.

Plantrino Guides · Updated 2026 · About a 9-minute read

Few money topics are misunderstood as widely as income tax brackets. The worry — "if this pay rise pushes me into the next bracket, I'll take home less" — sounds logical, and it is wrong. It comes from picturing the tax system as a set of switches, when it actually works like a set of layers. This guide explains Australia's brackets in plain language, walks through the arithmetic on a real salary, and covers the extras that the bracket table quietly leaves out: the Medicare levy, HECS-HELP, offsets, and super.

What a Progressive Tax System Means

Australia uses a progressive income tax. The word simply means the rate rises in steps as income rises. Your income is divided into bands, and each band carries its own rate. The first slice is taxed gently — not at all, in fact — and later slices are taxed harder.

The crucial detail, and the one most people miss, is that each rate applies only to the income that falls within its band. A higher rate never reaches back and re-taxes the income sitting below it. Think of it as pouring water into a series of buckets: once a bucket is full, the overflow goes into the next one, and only that overflow is charged at the next bucket's rate.

The Australian Brackets

These are the resident individual rates the Plantrino calculators use for the 2025–26 financial year (Australia's tax year runs 1 July to 30 June):

Two things worth noting. First, that first $18,200 — the tax-free threshold — is genuinely free of income tax, and it applies to almost every resident. Second, these figures do not include the Medicare levy, which is calculated separately and added on. Rates and thresholds are set each financial year, so check current ATO rates before relying on these for a decision that matters.

The Idea That Causes All the Confusion

The myth goes like this: "If I earn $45,001, I'm in the 30% bracket, so all my income is taxed at 30% and I'm worse off than someone on $45,000."

That is not how it works. Only that single extra dollar — the one dollar above $45,000 — is taxed at 30c. The $26,800 below it is still taxed at 16c, and the first $18,200 is still taxed at nothing. Someone on $45,001 pays exactly 30 cents more tax than someone on $45,000, and takes home 70 cents more.

Under the bracket system on its own, you cannot go backwards by earning more. Every extra dollar leaves you with something, even in the top bracket, where you still keep 55 cents of it before the levy.

Putting Real Numbers on It

Take someone with a taxable income of $70,000. Their income gets sliced across the bands, and each slice is charged at its own rate:

• First $18,200 at nil = $0
• Next $26,800 (from $18,201 to $45,000) at 16c = $4,288
• Final $25,000 (from $45,001 to $70,000) at 30c = $7,500
• Income tax = $11,788

Then the Medicare levy is added: 2% of $70,000 is $1,400. So the total comes to $13,188, and the take-home figure is $56,812 — roughly $4,734 a month, or $2,185 a fortnight.

Now look at what that means. This person sits "in the 30% bracket," yet they do not pay 30% of $70,000, which would have been $21,000. They pay $11,788 in income tax — about 16.8% of what they earned, or 18.8% once the levy is counted. The headline bracket overstates their actual burden by a wide margin, because most of their income never reached the 30c band at all. This is illustrative arithmetic on a simple salary with no deductions, offsets or HECS-HELP debt; your own figures will differ.

Marginal Rate vs. Effective Rate

Two different "rates" describe your tax, and mixing them up is the root of nearly every bracket misunderstanding.

Marginal rate

Your marginal rate is the rate that applies to your next dollar — the rate of your top band. For our $70,000 earner, that is 30c, or 32c once the 2% Medicare levy is included. It answers the question "if I pick up an extra shift, how much of it do I keep?" and it is the number that matters for decisions about overtime, a side hustle, or a salary sacrifice arrangement.

Effective rate

Your effective rate is the tax you actually paid divided by your total income. For our example, $11,788 ÷ $70,000 works out to about 16.8%. This is the figure that honestly reflects your tax burden, and in a progressive system it is always lower than your marginal rate.

Watching the gap between the two rates across incomes makes the point better than any explanation. On $45,000 the income tax is $4,288, an effective rate of about 9.5%. On $70,000 it is 16.8%. On $135,000 — the very top of the 30c band — the income tax of $31,288 is still only about 23.2%. Even someone earning $150,000, well inside the 37c bracket, has an effective income tax rate of roughly 24.6%. Nobody pays their headline bracket rate on their whole income.

Why a Pay Rise Always Helps

Suppose our $70,000 earner gets a $5,000 rise, taking them to $75,000. The whole rise falls inside the 30c band, so the income tax on it is $1,500, and the Medicare levy adds another $100. They keep $3,400 of the $5,000 — a bit under 70 cents in the dollar.

Their take-home pay went up. It did not go up by the full $5,000, because a portion of any income is taxed, but it went up. And there is a second effect people forget: employer super is calculated on your ordinary time earnings at 12%, so a $5,000 rise also adds around $600 a year to your super, on top of the cash. That money is locked away until you meet a condition of release, but it is real. Our pay rise guide works through why the number that lands in your account always looks smaller than the one in the letter.

What Sits on Top of the Brackets

The bracket table is only the first layer of an Australian tax bill. Several other things are calculated alongside it, and they are the reason two people on the same salary can end up with different outcomes.

• Medicare levy. The standard levy is 2% of taxable income and it is not part of the bracket table. Low-income earners may get a reduction or an exemption — those thresholds move each year, so check current ATO thresholds rather than assuming.
• Medicare levy surcharge. A separate charge that can apply to higher earners without an appropriate level of private hospital cover. It is calculated on its own income test, not on taxable income alone. The thresholds and rates change, so check the current ATO guidance before deciding whether hospital cover would leave you ahead.
• HECS-HELP and other study loans. These do not charge interest. Instead the balance is indexed, and once your income passes a repayment threshold, a compulsory repayment is collected through the tax system when you lodge. It is not deducted from your refund as a penalty — it is a repayment of your own debt. Thresholds and rates are set annually; check current ATO guidance.
• Tax offsets. Offsets reduce the tax you owe after it has been calculated. Most are not refundable, meaning they can take your tax bill to zero but will not generate a payment beyond that. Eligibility rules vary, so check the ATO's current list rather than assuming one applies.
• Superannuation. Employer super at 12% of ordinary time earnings sits outside this whole calculation. It is paid by your employer on top of your salary, not deducted from it, and it is not taxed in your return the way salary is. See our superannuation guide for how the contribution rules work.

PAYG Withholding: Why There Is a Refund at All

If you are an employee, you do not hand the ATO a cheque at the end of the year. Your employer withholds tax from every pay under a PAYG schedule and sends it in on your behalf. That schedule is an estimate built from your pay for that period, projected across a full year.

At the end of the financial year you lodge a return, the real numbers replace the estimate, and the difference is settled. If the estimate was generous, you get a refund. If it fell short, you get a bill. A refund is not a bonus from the government — it is your own money coming back after being over-withheld. Our payslip guide covers how to read what your employer is actually taking out each pay.

The most common reason for an unexpected bill is a second job. Each employer withholds as if it is your only income, and if the tax-free threshold gets claimed at both, too little tax is withheld overall. Bonuses, unpaid leave, and mid-year job changes create smaller versions of the same mismatch.

Deductions vs. Offsets

Australians use these two words interchangeably in conversation, and they do very different things.

A deduction reduces the income that gets taxed. Claim a $1,000 work-related deduction while your marginal rate is 30c, and your taxable income drops by $1,000, so your tax drops by $300 — plus $20 of Medicare levy, for $320 in total. A deduction is worth your marginal rate, not its full face value.

An offset reduces the tax bill itself. A $1,000 offset, if you are entitled to one, cuts $1,000 off the tax you owe. Dollar for dollar, an offset is worth far more than a deduction — which is why the eligibility rules for offsets are much narrower.

This is also why "spend money to get a tax deduction" is rarely good arithmetic on its own. Spending $1,000 to save $320 leaves you $680 out of pocket. The purchase has to be something you genuinely needed for work before the deduction makes it worthwhile. What you can claim depends on your occupation and circumstances — check the ATO's current guidance for your line of work, or talk to a registered tax agent.

The Narrow Cases Where More Income Can Cost You

Honesty matters here, because a blanket "a raise is always good" is very slightly too strong. The brackets themselves can never leave you worse off. But some things outside the brackets are tested against your income, and crossing one of their thresholds can claw back more than the extra income was worth.

Examples include family assistance payments that taper as income rises, income-tested concessions, and the Medicare levy surcharge, which switches on at a threshold rather than phasing in gently. Study loan repayments also step up as income rises. None of these are bracket effects — they are separate programs with their own income tests, administered under their own rules, and the thresholds change from year to year.

For most employees on a standard salary, none of this applies and a raise is simply a raise. If you are close to a benefit cut-off or weighing up private hospital cover, that is the point to check the current rules with the ATO or Services Australia, or to get advice from a registered tax agent.

Common Mistakes

• Turning down income to "stay in a bracket." The bracket only ever applies to the income above its threshold. Refusing overtime to avoid a bracket costs you money every time.
• Applying your bracket rate to your whole salary. If you multiply $70,000 by 30% you get $21,000, which is roughly $9,200 more than the real figure. Slice the income; do not multiply it.
• Forgetting the Medicare levy. It is not in the bracket table, but it is on your assessment. Two per cent of a $90,000 salary is $1,800 — enough to matter when you are budgeting for a bill.
• Treating a refund as a windfall. A large refund means a lot of your money sat with the ATO all year instead of in your offset account or emergency fund. It is not free money, and a big refund is not automatically a good result.
• Ignoring a second job's withholding. This is the single most common source of a surprise bill. If you have two jobs, understand which one the tax-free threshold is claimed at.
• Buying things for the deduction. A deduction returns your marginal rate, not the purchase price. Buy it because you need it, not because it is claimable.

Frequently Asked Questions

Tax brackets stop being intimidating once you see the core rule: each rate applies only to the income inside its own band. A raise always increases your take-home pay, your real burden is your effective rate rather than the headline, and the parts that genuinely change the outcome — the Medicare levy, a study loan, a second job's withholding — sit outside the bracket table entirely. Get those four ideas straight and you can read your own assessment with confidence.