Understanding Marginal Tax Rates in Australia (2025-26)

If you have ever hesitated to earn "just a bit more" because you are worried about moving into a higher tax bracket, you are not alone. It is one of the most common concerns among Australian employees, contractors and small business owners.

Understanding marginal tax rates in Australia is essential for making confident decisions about pay rises, bonuses, business profits or additional income streams. Australia's tax system is progressive, meaning different portions of income are taxed at different rates. This, however, does not mean that earning more income will reduce your take-home pay.

This article explains how marginal tax rates work in practice, how Medicare levies affect outcomes and why moving into a higher tax bracket almost always leaves you better off. Learn how experienced chartered accountants can help individuals and businesses navigate Australian tax efficiently.

WHAT IS A MARGINAL TAX RATE?

Your marginal tax rate is the rate of tax you pay on your next dollar of taxable income. It does not apply to your entire income.

Australia's progressive tax system taxes income in layers. As your assessable income increases, each portion is taxed at the rate that applies to its tax bracket. Only the income within that bracket is taxed at that rate.

This differs from your average tax rate, also known as your effective tax rate. Your average rate is your total income tax divided by your total taxable income and is usually much lower than your marginal rate. For example, if you earn $100,000 as an Australian resident, your marginal tax rate is higher than your average rate. You do not pay that top rate on the full amount; you pay it only on the income above the relevant threshold.

This distinction explains why moving into a higher tax bracket never reduces your take-home pay. Understanding this is central to effective tax planning, which is further supported by professional taxation services that can help clarify how marginal and effective rates apply to your circumstances.

HOW MARGINAL TAX BRACKETS WORK IN PRACTICE

For the 2025-26 financial year, the Australian Taxation Office applies the following income tax rates for Australian residents:

• $0 to $18,200: 0% (this is the tax-free threshold)
• $18,201 to $45,000: 16 cents for each $1 over $18,200
• $45,001 to $135,000: 30 cents for each $1 over $45,000
• $135,001 to $190,000: 37 cents for each $1 over $135,000
• Over $190,000: 45 cents for each $1 over $190,000

This structure is often described as the "cents per dollar over" system. Each slice of income is taxed separately, rather than applying one flat income tax rate to the whole amount. For example, if your taxable income is $120,000 for the tax year, then:

• The first $18,200 is tax-free
• The next $26,800 is taxed at 16%
• The next $75,000 is taxed at 30%

Only the portion of income above $45,000 is taxed at 30%. Your entire income is not suddenly taxed at the higher rate.

This slice-by-slice approach also applies to other forms of personal income, such as employment income, business income and some investment income. Capital gains tax is also linked to marginal tax rates, as net capital gains are added to your assessable income and taxed at your marginal rate, subject to available discounts.

HOW THE MEDICARE LEVY AND THE MEDICARE LEVY SURCHARGE AFFECT MARGINAL RATES

Income tax is not the only factor affecting your take-home pay. The Medicare levy and Medicare levy surcharge also play an important role in determining your effective tax rate:

• The Medicare levy is generally 2% of your taxable income. It applies to most Australian taxpayers, although low-income earners may qualify for reductions or exemptions.
• The Medicare levy surcharge — with thresholds based on income and family status — is an additional charge of between 1% and 1.5% for higher-income individuals and families who do not hold eligible private hospital cover.

When combined with income tax, these levies increase your effective marginal tax rate. For example, a taxpayer on a 37% marginal income tax rate who also pays the Medicare levy and surcharge could face an effective marginal rate of more than 40% on their next dollar of income.

This does not mean earning more is a bad idea. It does mean that understanding thresholds, private health insurance options and levy impacts is essential for informed decision-making, particularly for higher-income earners and business owners.

THE EFFECTS OF BRACKET CREEP AND INFLATION

Bracket creep occurs when inflation or wage growth pushes income into higher tax brackets, even if your real purchasing power has not increased significantly.

For example, a pay rise that merely keeps pace with rising living costs may still result in a higher personal income tax bill if tax brackets do not fully adjust for inflation. Over time, this increases the average tax rate paid by Australian taxpayers.

Governments may partially address bracket creep through tax cuts or threshold changes announced in the federal budget. However, these adjustments do not always keep pace with inflation every year.

This is why understanding the marginal tax rates Australia applies is not just about knowing the headline numbers. It is about anticipating how changes in income, inflation and policy can affect your net income over time and planning proactively.

PLANNING AROUND MARGINAL TAX RATES

Effective tax planning ensures that earning more income always works in your favour. For employees, contractors and business owners, this often involves legally reducing taxable income or improving after-tax outcomes.

Common strategies include:

• Salary packaging and fringe benefits
• Concessional superannuation contributions
• Claiming all allowable deductions
• Timing income and expenses across financial years

For higher-income earners and business owners, tailored advice is particularly valuable. Business structures, income timing and eligibility rules can significantly affect tax outcomes.

Professional advice can help reduce tax for high-income earners, manage compliance obligations and align tax planning with long-term wealth management objectives. Access to experienced advisers and professional guidance ensures decisions made today support both immediate cash flow and future growth.

PLAN SMARTER, EARN MORE WITH WILSON PORTER

Marginal tax rates often sound more intimidating than they are. Australia's progressive tax system applies higher rates only to additional income, with Medicare levies influencing effective rates.

With the right planning, earning more income will always increase your take-home pay. The key is understanding how the rules apply to your situation and making informed decisions before the end of the financial year.

Wilson Porter supports Australian taxpayers, business owners and high-income individuals by simplifying tax compliance and delivering practical, growth-focused advice.

Learn how Wilson Porter can help you make the most of your marginal tax rate and plan with confidence.

FAQs

What is the marginal income tax rate in Australia?

It is the percentage paid on your next dollar of taxable income under Australia's progressive tax system.

What are the marginal tax rates?

For 2025-26, marginal rates range from 0% to 45% for Australian residents, plus a 2% Medicare levy and possible surcharge.

Do I pay the higher rate on all my income?

No. Only the portion of income above each threshold is taxed at the higher rate.

Can earning more ever reduce my take-home pay?

No. Higher earnings always increase take-home pay.

How does the Medicare levy affect my effective tax rate?

It adds 2% to income tax, with an additional 1% to 1.5% surcharge for higher-income earners without private hospital cover.