Australia taxes its residents on worldwide income, and the United States taxes its citizens and green card holders on worldwide income regardless of where they live. An American who moves to Sydney, Melbourne, Perth, or anywhere else in Australia does not get to pick one system: the ATO return keeps coming and so does the IRS return. US expat taxes in Australia turn on a handful of interacting questions: which US mechanism, the foreign earned income exclusion or the foreign tax credit, actually eliminates the US bill, whether the tax treaty and totalization agreement help, and what to do about superannuation, the single most unresolved issue an American in Australia will face.
Do You Have to File a US Tax Return While Living in Australia?
Yes. US citizenship and lawful permanent residency (green card status) carry a worldwide income tax filing obligation that does not end when you move abroad. Australian tax residence is a separate question decided under Australian law, and Australia taxes its tax residents on income from all sources, foreign and domestic, generally at higher marginal rates than the comparable US brackets.
The result is two independent filing obligations that run in parallel rather than one combined system. You report your worldwide income, including Australian salary, investment income, and business income, on both the ATO return and the US Form 1040. The US return is not eliminated by paying Australian tax; instead, US law provides mechanisms, principally the foreign tax credit and the foreign earned income exclusion, to prevent the same income from being taxed twice. Getting the mechanism right is where most of the planning value sits.
Should You Use the Foreign Earned Income Exclusion or the Foreign Tax Credit in Australia?
For most Americans in Australia, the foreign tax credit on Form 1116 outperforms the foreign earned income exclusion on Form 2555, because Australian income tax rates are high enough on ordinary wages that the credit alone typically wipes out the US tax on the same income.
The foreign earned income exclusion under IRC §911 lets a qualifying individual exclude a limited, annually indexed amount of foreign earned income from US tax (the maximum was $126,500 for 2024 and $130,000 for 2025, and it continues to rise each year), provided you meet either the bona fide residence test or the physical presence test. It only shelters earned income, not investment income, and it comes with a real cost: using the exclusion generally disqualifies the refundable Additional Child Tax Credit for that year, and it does not build any carryover for future years.
The foreign tax credit under IRC §901, claimed on Form 1116, instead credits Australian tax paid, dollar for dollar up to the US tax on the same category of income, computed separately by basket under IRC §904. Because Australian tax on wages is generally higher than the corresponding US tax, most Australia-based Americans generate excess foreign tax credit rather than a shortfall, and unused credit can carry back one year and forward ten years under Form 1116's Schedule B. The FTC also preserves the Additional Child Tax Credit for families with qualifying children who have Social Security numbers. Our FTC versus FEIE comparison walks through the full decision framework, including the narrower cases where the exclusion still makes sense (low-taxed income, self-employment where FTC categories get complicated, or years where residency tests are easier to meet than a clean FTC computation).
Does the US-Australia Tax Treaty Help Prevent Double Taxation?
Partly. A US-Australia income tax treaty exists and coordinates taxing rights over specific categories of income, such as business profits, dividends, interest, and government pensions, but it does not replace the FTC or FEIE as the primary double-tax relief mechanism for a US citizen's ordinary income, because the treaty's saving clause lets the US continue taxing its own citizens largely as if the treaty did not exist.
Where the treaty matters most in practice is in allocating taxing rights on specific income categories and in defining terms like residency for tie-breaker purposes when someone is arguably a tax resident of both countries under domestic law. Treaty positions that reduce or modify US tax are generally disclosed on Form 8833 under IRC §6114, subject to certain waivers in the regulations. Do not assume the treaty text hands you a specific article number or benefit without reading the current treaty and protocol directly. It is easy to overstate what a treaty does; the safer approach is to rely on the FTC and FEIE mechanics described above for the bulk of the double-taxation problem and treat the treaty as a supplementary tool for specific issues.
Does the US-Australia Totalization Agreement Matter for Expats?
Yes, if you are self-employed or your employer sends you to Australia on assignment. A US-Australia totalization agreement exists, and it prevents the same work income from being subject to both US self-employment tax and the Australian equivalent social security contributions by assigning coverage to a single system, typically documented with a certificate of coverage.
This matters most for a US self-employed person operating in Australia, or an employee on a limited-duration assignment whose employer wants to keep them in the US Social Security system rather than switching them into the Australian system. Without a certificate of coverage, a self-employed American could otherwise face social security-type obligations in both countries on the same earnings. Our guide to totalization agreements and self-employment tax abroad covers how to request a certificate of coverage and which category of worker actually needs one.
Is Australian Superannuation Taxed by the IRS?
This is genuinely unsettled, and any advisor who states a single confident answer without qualification is overstating the state of the law. Unlike the UK and Canadian tax treaties, which contain provisions that let a US person defer US tax on pension growth until distribution, the US-Australia treaty has no comparable accrual-deferral article for superannuation.
Because there is no treaty override, the analysis falls back entirely to US domestic law, specifically the interaction of IRC §§401(a) and 402(b), and there is no IRS guidance directly on point for Australian super. Practitioners differ on several open questions: whether a superannuation fund should be treated as an employees' trust under §402(b) (in which case current US taxation of accruals may depend on whether the participant is a highly compensated employee under §402(b)(4)(A)), whether it should instead be analyzed as a foreign grantor trust, and whether mandatory Superannuation Guarantee employer contributions are currently taxable compensation to the employee the way an ordinary deferred-compensation arrangement would be. There is also no settled consensus on whether in-fund investment growth accruing before retirement is currently taxable income.
What we recommend is not a shortcut: analyze the specific fund structure and the individual's employment facts, take a defensible, documented position on how contributions and growth are treated, apply that position consistently year over year, and revisit it if IRS guidance or new case law changes the landscape. Our deeper foreign pension US tax treatment guide works through the same four-question framework, treaty article, §402(b) mechanics, reporting stack, and distribution taxation, in more depth and explains exactly why Australian super sits in the unresolved category next to the clearer UK and Canadian cases.
Are Australian Managed Funds a PFIC Problem?
Usually yes. Most Australian managed funds, exchange traded funds, and the underlying investment options inside a superannuation fund are passive foreign investment companies under IRC §§1291 and 1298, the same trap that catches UK unit trusts and Canadian mutual funds for US taxpayers abroad.
Absent a timely qualified electing fund or mark-to-market election, a PFIC triggers the punitive excess distribution regime on gains and certain distributions: the gain gets allocated across the entire holding period, taxed at the highest marginal rate in effect for each of those years, plus a nondeductible interest charge for the deferral. Each PFIC holding generally requires its own Form 8621 filing. A related and frequently misunderstood point involves franking credits: Australia's dividend imputation system attaches a franking credit to many Australian dividends to offset corporate tax already paid, but that credit is an Australian domestic mechanism. It is not a foreign tax paid by the US shareholder in the sense IRC §901 requires, so franking credits are not simply added to your Form 1116 foreign tax credit computation the way withheld Australian tax would be; they need to be analyzed separately from any actual creditable Australian tax.
What Else Do You Have to Report Besides the Tax Return?
The income tax return is only part of the picture. US persons with foreign financial accounts and assets face separate information-reporting obligations that carry their own penalties, independent of whether any US tax is actually owed.
The Reporting Stack for Americans in Australia
Reference- FBAR (FinCEN Form 114). Required once the aggregate value of foreign financial accounts, including bank accounts and superannuation accounts, exceeds $10,000 at any point during the year, under 31 CFR 1010.350. See our FBAR filing guide.
- Form 8938 (FATCA, IRC §6038D). Required above thresholds that are higher for taxpayers living abroad than for US residents; superannuation and other Australian financial accounts and interests can be specified foreign financial assets. See our Form 8938 guide.
- Form 8621 (PFIC, IRC §§1291/1298). Required for each Australian managed fund or similar pooled investment that is a PFIC. See our PFIC and Form 8621 guide.
- Form 1116 (Foreign Tax Credit). Filed to claim credit for Australian income tax paid, computed separately by income category. See our Form 1116 guide.
FBAR and Form 8938 are filed even in years when no additional US tax is due, and the penalties for missing them are typically far larger than any tax at stake, which is why the reporting side deserves the same attention as the income tax computation itself.
Bottom Line
An American living in Australia files two tax returns every year, and the foreign tax credit is usually the more efficient of the two main US relief mechanisms given how Australian tax rates compare to US rates. Superannuation is the one place where honesty matters more than confidence: the treaty gives you no deferral article, the law is unsettled, and the right move is a documented, consistent position rather than a guess. Layer on PFIC exposure in Australian managed funds and the FBAR and Form 8938 reporting stack, and the filing becomes a genuinely technical project rather than a routine return.
If you recently moved to Australia, hold superannuation or Australian managed funds, or suspect a prior year's return got the FTC, PFIC, or reporting obligations wrong, the fix is cheaper before the IRS raises it. Have questions about US expat taxes in Australia? Contact TS CPA for a free consultation. We respond within the same day.
Official IRS and Government Sources
- IRS, Foreign Earned Income Exclusion
- IRS, Foreign Tax Credit
- IRS, Form 1116 Instructions
- IRS, Report of Foreign Bank and Financial Accounts (FBAR)
- IRS, Summary of FATCA Reporting for US Taxpayers
- IRS, Instructions for Form 8621 (PFIC)
- US-Australia Income Tax Treaty
- Social Security Administration, US-Australia Totalization Agreement