TL;DR
- Your Australian tax residency status determines whether US income must be declared in Australia at all.
- The US-Australia tax treaty reduces double taxation but does not eliminate your lodgment obligation.
- The Foreign Income Tax Offset (FITO) is your primary mechanism for offsetting US taxes already paid.
- US-sourced income types (salary, rental, capital gains) are treated differently under Australian tax law.
- Non-lodgment is one of the costliest mistakes Australian expats in the US make. A non-resident Australian tax return is almost always still required.
Rule 1: Does Your Australian Tax Residency Status Still Apply?
Before declaring a single dollar of US income on an Australian return, you must first answer a prior question: does Australia even have the right to tax your worldwide income? The answer hinges entirely on your Australian tax residency status, and it is not automatically lost the moment you board a flight to the US [1].
The ATO applies four residency tests. Most Australians in the US are assessed under the Domicile Test or the 183-Day Test. A common misconception is that signing a US lease or getting a Social Security Number severs Australian tax residency. It does not, on its own.
- Resides Test: Are you actually residing in Australia? For US-based expats, this is usually not met.
- Domicile Test: Is your domicile of origin Australia, and do you lack a permanent place of abode overseas? If your US stay is temporary or your ties to Australia remain strong, you may still be a resident under this test.
- 183-Day Test: Did you spend 183 days or more in Australia in the income year? Less common for established US residents.
- Commonwealth Superannuation Test: Applies to government employees on postings.
The practical consequence: If you are still an Australian tax resident under any of these tests, you must declare your worldwide income, including all US-sourced income, on your Australian non-resident tax return or resident return as applicable [1]. If you have been classified as a non-resident, your Australian return captures only Australian-sourced income. Getting this classification wrong in either direction creates real compliance risk.
Rule 2: How Does the US-Australia Tax Treaty Protect You?
Building on the residency question above, the next most important framework is the US-Australia tax treaty, formally the Convention Between Australia and the United States of America for the Avoidance of Double Taxation. This treaty is the legal mechanism that prevents you from paying full tax on the same income twice [1].
Here is what the treaty does and does not do:
| What the Treaty Does | What the Treaty Does NOT Do |
|---|---|
| Allocates taxing rights between Australia and the US for specific income types | Eliminate your obligation to lodge an Australian return |
| Reduces or eliminates withholding tax on dividends, interest, and royalties | Automatically zero out your Australian tax liability |
| Provides a basis for the Foreign Income Tax Offset (FITO) claim | Cover every income type in the same way (treatment varies by category) |
| Offers a tie-breaker rule for dual residency situations | Replace the need for expert Australian expat tax guidance |
The treaty is a framework, not a blanket exemption. Knowing which article applies to your specific income type (employment income, dividends, rental income, capital gains) is essential to claiming treaty benefits correctly [1].
Rule 3: How Do You Use the Foreign Income Tax Offset to Avoid Double Taxation?
Stepping back from the treaty structure, the practical tool you use on your Australian tax return is the Foreign Income Tax Offset (FITO). This is a dollar-for-dollar credit for foreign tax you have already paid, applied against your Australian tax liability on the same income [1].
Key rules for FITO claims:
- You can only claim a FITO for tax you have actually paid (or are liable to pay) to the US government.
- The FITO cannot exceed the Australian tax payable on the same foreign income. It reduces your bill; it does not generate a refund beyond that.
- State-level US taxes may also be creditable in some circumstances, but each case depends on the nature of the income and the applicable treaty article.
- You must keep documentary evidence of US taxes paid, typically your US federal tax return (Form 1040) and any withholding statements.
A common mistake is assuming that because you paid US tax, you owe nothing in Australia. That is only true if your US tax rate equalled or exceeded your Australian rate on that income. Where the US rate was lower, a residual Australian liability may remain.
Rule 4: Are All Types of US Income Treated the Same Way?
A related but distinct question is whether income type changes your obligations. It does, materially. Not all US-sourced income flows through the same rules on an Australian non-resident tax return or resident return [1].
- US employment income (salary and wages): Generally taxable in the US as your primary country of work. If you remain an Australian tax resident, you declare it in Australia and claim FITO against it.
- US rental income: Taxable in the US as the country where the property is located. If you are an Australian tax resident, you also declare it in Australia. Expenses are deductible under Australian rules.
- US dividends: The treaty reduces withholding tax rates on US dividends paid to Australian residents. Gross dividends (before US withholding) are declared in Australia; the withholding tax becomes part of your FITO claim.
- Capital gains on US assets: The treaty allocates taxing rights differently for real property versus shares. Australian tax residents must assess whether Australian CGT also applies, and importantly, as a non-resident of Australia you do not access the 50% CGT discount on Australian assets.
The interaction between income type, treaty article, and Australian tax rules is where most errors occur in a non-resident Australian tax return. A generalised approach produces incorrect outcomes.
Rule 5: Non-Lodgment Is Not a Safe Default
The final rule addresses the single most costly assumption Australian expats in the US make: “I am paying tax in the US, so I do not need to lodge in Australia.” For most Australians in the US, this is incorrect, and the ATO has mechanisms to detect it [1].
Why non-lodgment carries serious risk:
- The ATO cross-references data through international tax information exchange agreements. US financial institutions report to the IRS, and that data flows to the ATO through bilateral arrangements.
- Failure to lodge penalties accumulate per year of non-lodgment and compound over time.
- If you have Australian-sourced income (rental property, dividends, managed funds), a non-resident Australian tax return is almost certainly required regardless of your residency status.
- Voluntary disclosure of overdue returns is treated more favourably by the ATO than lodgment triggered by an ATO audit or review. Acting proactively almost always produces a better outcome.
The right strategy is not to avoid lodging. It is to lodge correctly, claim every available offset, and ensure your residency classification is accurate from year one.
Frequently Asked Questions
Do I have to lodge an Australian tax return if I live in the US and earn no Australian income?
If you are still classified as an Australian tax resident, yes. You must declare worldwide income regardless of its source. If you are a genuine non-resident and have no Australian-sourced income, you may not need to lodge, but you should confirm your residency status formally rather than assume it.
What is the US-Australia tax treaty and how does it help me?
The US-Australia tax treaty is a bilateral agreement that allocates taxing rights between the two countries and reduces withholding tax on cross-border income. It is the legal basis for claiming relief from double taxation, but it does not remove your Australian lodgment obligation [1].
Can I claim the Foreign Income Tax Offset for state taxes paid in the US?
In some circumstances, yes. State income taxes paid in the US may be creditable, depending on the nature of the income and how Australian tax law treats the foreign tax. This requires case-by-case assessment rather than a blanket rule.
What happens if I have not lodged an Australian tax return for several years?
The ATO can impose failure-to-lodge penalties for each overdue year. However, voluntary disclosure before an ATO audit generally results in a more favourable outcome, including potential penalty reduction. Acting now is almost always better than waiting.
I became a US permanent resident (Green Card holder). Am I still an Australian tax resident?
Holding a Green Card does not automatically sever Australian tax residency. The ATO assesses residency based on its own tests, not your immigration status in another country. Your domicile, ties to Australia, and intentions all factor into the determination [1].
Does the 50% CGT discount apply if I sell Australian property while living in the US?
No. As a non-resident of Australia, you are not entitled to the 50% CGT discount on Australian assets. Additionally, the 15% Foreign Resident CGT Withholding regime applies to property sales above the relevant threshold in the 2025-26 financial year. This is one of the most consequential differences between resident and non-resident tax treatment.
Do I need a specialist, or can any accountant handle my Australian expat tax return?
Technically any Registered Australian Tax Agent can lodge a return. In practice, expat returns involving residency determinations, FITO claims, treaty applications, and non-resident CGT rules are areas where generalist accountants frequently produce incorrect outcomes. The cost of an incorrect return, particularly a wrong residency classification, typically far exceeds the cost of using a specialist from the outset.
About ODIN TaxODIN Tax is Australia’s specialist tax agent practice exclusively serving Australian expats and non-residents, and is part of the ODIN Group. Headquartered in Hong Kong and regulated as a Registered Australian Tax Agent, ODIN Tax prepares non-resident Australian tax returns, resolves overdue lodgments, and assists with tax residency determinations, CGT matters, and Foreign Income Tax Offset claims for Australians across 40+ countries including the US, UK, Singapore, Hong Kong, and UAE. For Australians also investing in Australian property, the ODIN Group combines mortgage broking, tax, and conveyancing under one coordinated team, so your tax position is built into your property strategy from day one, not addressed after the fact.
Get your Australian tax return right in 2026.
If you are an Australian living in the US and unsure whether you need to lodge, whether the US-Australia tax treaty applies to your situation, or how to claim your Foreign Income Tax Offset correctly, speak with a specialist who handles these cases every day.
Disclaimer: This article contains general information only and does not constitute personal tax advice. Australian tax law is complex and individual circumstances vary. For advice specific to your situation, consult a Registered Australian Tax Agent. ODIN Tax is a Registered Australian Tax Agent. All references to tax rules apply to the 2025-26 financial year unless otherwise stated.
References
- A Practical Guide to US Taxes for Australians Living in the USA (atlaswealth.com)
