U.S. EXPAT TAX GUIDE – AUSTRALIA
File US taxes from Australia
Most US citizens in Australia file in both countries, but don’t end up paying US income tax thanks to credits and the US-Australia tax treaty.
Here is a starter guide for US expats in Australia on what to file, when you might owe US tax, and how the US-Australia rules work to prevent double taxation.
Updated on March 03, 2026
Table of Contents
What are the 2025 US tax filing thresholds for Americans living in Australia?
Here are the main filing thresholds for 2025 that US expats need to be aware of:
| Filing status | Threshold | Requirement |
| Married filing jointly (MFJ) | US$31,500 | Applies to spouses filing a joint return |
| Applies to spouses filing a joint return | Applies to spouses filing a joint return | Applies if you cover more than half of household costs and have a qualifying dependent |
| Single filer | US$15,750 | Applies if you are unmarried and do not qualify as Head of Household |
| Married filing separately (MFS) | US$5 | Common for Americans married to non-US citizens |
The filing threshold is the amount of gross income you can earn before you’re required to file a US tax return. The exact amount depends on your filing status and age.
Even small amounts trigger filing for Married Filing Separately status. For example, if you are married to a non-American and your worldwide income exceeds US$5, you need to file a US tax return.
📌 Note: Filing a US tax return doesn’t necessarily mean you will owe any tax—most Americans in Australia pay nothing due to credits and exclusions.
Why the Head of Household status can be better for US expats
Filing as Head of Household can be more beneficial than Married Filing Separately. It usually provides:
- A higher standard deduction
- Access to certain credits, such as the Child Tax Credit
To qualify, you must:
- Be unmarried or considered unmarried for tax purposes
- Pay more than half the cost of maintaining your home
- Have a qualifying child or dependent living with you for more than half the year
💡 Tip: If your spouse is a nonresident alien and you don’t elect to treat them as a US resident for tax purposes, you may be able to qualify as Head of Household if you meet the ‘considered unmarried’ rules.
When do Americans in Australia have to pay US taxes?
Most US citizens and Green Card holders in Australia don’t end up owing US tax because they use the Foreign Tax Credit (FTC) to offset the Australian tax they already paid.
But there are situations where you may still owe US tax:
- If you earn US-sourced income → then you may owe U.S. tax on that income.
- For example: rental property in the US, dividends, interest, or capital gains from US investments, or sales of US assets (like shares, property, or vehicles)
- If you pay little or no Australian tax → then you may not have enough foreign tax credits to offset US taxes.
- For example: salary packaging that reduces your taxable income, or termination payments that are taxed at a low rate in Australia.
🔑 Key takeaway: If your only income is from Australia and you have no major investments, you likely won’t owe the IRS, but you still must file annually.
Types of income you must report to the US
Living in Australia doesn’t change what the US considers taxable income. If you’re a US taxpayer, you’re generally required to report your worldwide income.
- Salary and wages
- Superannuation contributions/earnings/distributions
- Self-employment income
- Dividends and interest
- Rental income
- Capital gains from investments or property
- Equity compensation (RSUs, stock options)
The key factor is not where the income is earned, but how it is classified under US tax law and whether credits or exclusions apply.
IRS forms most US expats in Australia encounter
US citizens and green card holders living in Australia often deal with a mix of standard tax forms and international reporting forms.
Many expats file:
- Form 1040: Your main US individual income tax return
- Form 1116: Foreign Tax Credit (to claim credit for Australian income tax paid)
- Form 2555: Foreign Earned Income Exclusion and Housing Exclusion
Forms tied to foreign assets or structures:
- FBAR (FinCEN Form 114): Reporting foreign bank and financial accounts
- Form 8938: FATCA reporting of specified foreign financial assets
- Form 8621: PFIC reporting (often triggered by certain non-U.S. investment funds)
- Form 5471/Form 8865: Reporting ownership in foreign companies or partnerships
Not everyone needs to file all of these forms. The key is understanding which ones apply to your specific situation.
Living in Australia with US tax obligations? Reach out now for support.
US tax deadlines in Australia
Key dates for the 2025 tax year:
- April 15, 2026: Standard US filing deadline.
- June 15, 2026: Automatic 2-month extension for taxpayers living abroad on April 15. (No form required, but you must attach a statement if filing after April 15.)
- October 15, 2026: Extension deadline if you file Form 4868.
- October 15, 2026: FBAR deadline (it automatically extends from April 15 to October 15; no separate form required).
- Form 2350: Can extend the deadline further if you need additional time to qualify for the Foreign Earned Income Exclusion based on the physical presence test.
Australian tax deadlines do not change US filing or payment deadlines. Even if you use an extension to file, any US tax owed is still due by April 15 to avoid interest charges.
Many expats file an extension to wait for finalized Australian income figures. That’s common and acceptable, as long as extensions are properly filed and any estimated US tax is paid on time.
Reporting Australian bank accounts and financial assets
If you’re a US citizen or green card holder living in Australia, you may need to report your Australian financial accounts to the U.S. government. These reporting rules are separate from your tax return.
FBAR (FinCEN Form 114)
You must file an FBAR if the total combined value of your non-US accounts exceeded US$10,000 at any time during the year.
This includes Australian bank accounts, savings accounts, superannuation accounts, investment accounts, and certain joint accounts.
FATCA (Form 8938)
Form 8938 is filed with your US tax return and has higher thresholds for taxpayers living abroad. For single filers living outside the US, reporting generally begins at:
- US$200,000 on the last day of the year, or
- US$300,000 at any time during the year
Higher thresholds apply for married taxpayers filing jointly.
Joint accounts count toward your reporting thresholds, even if the other account holder is a non-US spouse. Failing to file these forms can result in significant penalties, even if no additional tax is due.
Is double taxation possible for US expats in Australia?
It’s rare, but double taxation can occur. One example is the Net Investment Income Tax (NIIT), a 3.8% US surtax on certain investment income for higher earners that is paid in addition to regular US tax.
For instance, if you have US$50,000 of investment income, you could owe about US$1,900 in NIIT even if Australian taxes cancel out your regular US tax. This tax cannot be offset by Australian taxes, even if credits eliminate your regular US tax.
Is there a US-Australia tax treaty?
Yes. The US-Australia tax treaty is a core tool in avoiding double taxation for US citizens in Australia and determining which country has taxing rights over specific types of income.
However:
- It is not a guaranteed way to lower your tax bill to the minimum.
- It does not exempt you entirely from paying US tax.
- The savings clause allows the US government to tax its citizens and Green Card holders under US domestic law, regardless of the treaty.
The US-Australia tax treaty helps prevent double taxation by coordinating which country has taxing rights over specific types of income.
However, the treaty does not eliminate all US tax obligations. Under the “saving clause,” the United States retains the right to tax its citizens and Green Card holders under domestic law.
US credits and deductions expats can claim in Australia
- Additional Child Tax Credit: You can claim up to US$1,700 per qualifying child
This is one of the few credits that may still be refundable for expats, even when little or no US tax is owed, depending on income and filing method.
- Education credits (for eligible foreign schools)
- IRA contributions
The US-Australia totalization agreement explained
The US-Australia totalization agreement helps Americans who are self-employed or operate a business in Australia avoid paying Social Security taxes to both countries.
For 2025, US self-employment tax is generally 15.3%. However, under the US-Australia totalization agreement, many self-employed Americans residing in Australia are exempt from US Social Security tax, provided they meet the eligibility rules
Here’s how the totalization agreement changes US self-employment tax obligations in Australia:
| ✖ Without the agreement | ✔ With the agreement |
| Self-employed Americans must pay the US self-employment tax (Social Security & Medicare) and Australian tax. | You avoid the US self-employment tax. |
| Foreign tax credits don’t reduce the US self-employment tax. | You pay into Australian superannuation instead of US Social Security. |
Can US expats have a superannuation fund?
Yes, as long as you are employed by an Australian-based company or an independent Australian employer. And whether you work full-time, part-time, or on a casual basis, you are eligible for the ‘super guarantee.’
The super guarantee is a compulsory payment made by your Australian employer into your chosen superannuation fund. These are pre-tax contributions similar to a 401(k).
How does the US treat Australian superannuation?
The US-Australia tax treaty does not clearly shield super funds, so US citizens and green card holders may face ongoing US tax and reporting obligations.
The US tax treatment depends on the type of super fund and whether you have control over its management, such as in a Self-Managed Super Fund (SMSF).
Retail and industry super funds are often treated as foreign employee benefit trusts. In many cases:
- Employer contributions may be taxable in the US when made
- Salary-sacrifice contributions are generally taxable as earned income
- Annual earnings inside the fund may also be taxable, even if not distributed
Self-managed super funds (SMSFs) are more likely to be treated as foreign grantor trusts. This can mean:
- Contributions and annual earnings are taxable in the U.S
- Additional reporting, including Forms 3520 and 3520-A, may apply
- The account may also need to be reported on the FBAR and Form 8938
Because the rules are complex and penalties can be high, professional cross-border advice is strongly recommended.
What happens if you fall behind on US filings?
Missing US filings does not automatically mean penalties. However, ignoring the issue can lead to larger penalties and more complicated corrections later.
Importantly, penalties can apply even when no US income tax is owed, especially for missed international reporting forms such as the FBAR or Form 8938.
Catch-up options for US expats in Australia
The IRS offers compliance programs for taxpayers who were unaware of their U.S. filing obligations. These include:
- Streamlined Filing Compliance Procedures
- Delinquent FBAR submission procedures
These programs are intended for non-willful mistakes. Acting sooner rather than later generally makes the process smoother and less stressful.
The Ultimate US-Australia Tax Guide
Download your free copy of the 40-page guide that covers everything Americans in Australia need to know about US tax filing. Not in the blog, only in the guide.
US Taxes in Australia FAQs
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Do I have to report my Australian income to the IRS?
Yes. Worldwide income must be reported, including Australian wages, investments, and business earnings.
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What if I haven’t filed US taxes while living in Australia?
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Do I have to report my superannuation?
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Can I file US taxes online from Australia?
