The US-Australia DTA and Why the US Is Unique

The United States and Australia have maintained a Double Tax Agreement (DTA) since 1983, designed to prevent the same income being taxed by both countries. However, US citizens face a fundamentally different tax situation than citizens of almost any other country. The US is one of only two countries in the world (alongside Eritrea) that taxes citizens on their worldwide income regardless of where they live or work.

This means a US citizen living in Australia must report and pay tax on income earned in Australia, the US, and any other country—even if they have not lived in the US for decades. This citizenship-based taxation system, combined with Australian residency-based taxation, creates a unique compliance burden. The DTA exists to provide relief mechanisms, but it does not eliminate the requirement to file with both countries.

For US citizens and green card holders in Australia, understanding how the DTA interacts with both tax systems is essential. Failure to comply with either country's requirements carries serious consequences: penalties, interest, and potential prosecution in both jurisdictions.

How US Taxation Works for Citizens Abroad

All US citizens and green card holders must file a US tax return every year if their income exceeds the filing threshold, regardless of whether they live in Australia, Europe, or anywhere else. This filing requirement exists even if no US tax is ultimately owing after applying credits.

The US requires reporting of worldwide income: wages from Australian employers, rental income from Australian properties, investment gains, business profits, and any other income stream. Green card holders are treated the same as citizens for tax purposes.

Beyond income tax, US citizens in Australia must comply with FBAR (Foreign Bank Account Report) if they hold foreign bank accounts totalling more than USD 10,000 at any point during the year. Australian bank accounts, investment accounts, and even some Australian superannuation accounts are considered foreign accounts. FBAR is filed separately from the income tax return and carries substantial penalties for non-compliance—up to USD 10,000 per violation or 50% of account balances.

FATCA (Foreign Account Tax Compliance Act) requires US citizens to report foreign financial assets above certain thresholds on Form 8938. Again, Australian accounts and property are foreign assets for FATCA purposes. These requirements exist because the US is attempting to identify and prevent tax evasion by citizens holding offshore accounts.

Key DTA Provisions: Dividends, Interest, and Royalties

The US-Australia DTA specifies maximum withholding tax rates for certain categories of investment income, providing relief when one country has already taxed the income.

Dividends from Australian companies paid to US persons are generally subject to a 15% withholding tax under the DTA. However, if a US person owns 25% or more of the voting power of an Australian company, the rate reduces to 5%. Without the DTA, Australian withholding tax on dividends is 30%. Franking credits attached to dividends can be claimed by US shareholders, though the US tax treatment of franking credits is complex and often requires specialist advice.

Interest paid by Australian borrowers to US lenders is subject to a 10% withholding tax under the DTA. Australian withholding tax on interest is normally 10%, so the DTA provides no additional relief here, but it codifies the rate.

Royalties (payments for use of patents, copyrights, trademarks, know-how) are subject to a 5% withholding tax under the DTA when paid from Australia to a US resident. These provisions matter primarily for business owners and investors with substantial passive income streams.

Employment Income and the Foreign Earned Income Exclusion (FEIE)

Employment income is taxed in the country where the work is performed under Article 15 of the DTA. A US citizen working in Australia will have their wages taxed by Australia first. The US will then allow either a Foreign Earned Income Exclusion (FEIE) or a Foreign Tax Credit (FTC) to offset US tax, though not both for the same income.

The FEIE allows a US citizen to exclude earned income from US taxation up to USD 126,500 in 2024 (this limit adjusts annually for inflation). "Earned income" means wages, salary, professional fees, and self-employment income—not investment income, rental income, or other unearned sources. To qualify for FEIE, a taxpayer must meet either the Physical Presence Test (present outside the US for at least 330 days in a 12-month period) or the Bona Fide Residence Test (established as a bona fide resident of a foreign country for an uninterrupted tax year).

Most US citizens working full-time in Australia easily meet one of these tests. However, the FEIE is complex: it applies only to earned income, not capital gains; it does not apply to self-employment tax (Social Security/Medicare tax still applies on FEIE income); and claiming it requires careful documentation. Many US expats use FEIE for wages but claim FTC for Australian tax paid on other income sources, requiring separate tracking.

Foreign Tax Credits for US Citizens

Instead of (or in addition to) the FEIE, a US citizen in Australia can claim a Foreign Tax Credit (FTC) for Australian income tax paid. The FTC reduces US tax dollar-for-dollar (up to the amount of US tax on that income), providing relief from double taxation.

The FTC is calculated per "basket" of income: ordinary income, capital gains, dividends, and other categories have separate FTC limitations. This means a US citizen cannot offset all their Australian tax against all their US tax; they must match the type of income. Excess FTC in one basket cannot be fully carried to another.

For most US citizens in Australia working full-time and earning ordinary wages, the FEIE is simpler and more beneficial than FTC. However, for those with significant investment income, rental income, or capital gains, FTC becomes essential. The interaction between FEIE and FTC is a critical planning point and often requires specialist US tax advice to optimise.

Australian tax rates (up to 45% plus Medicare levy) exceed US federal rates in many cases, so FTC claims often result in "excess" foreign tax credits that cannot be used. These excess credits can be carried back one year or forward 10 years, providing a planning opportunity in years of lower US income.

Business Profits and the Permanent Establishment Concept

If a US citizen operates a business in Australia (whether as a sole trader, partnership, or company), the DTA defines "Permanent Establishment" (PE) to determine which country has taxing rights.

A PE exists if a business has a fixed place of business (office, branch, workshop) in Australia through which business is habitually conducted. Without a PE, business profits are not taxed by Australia; with a PE, they are. A US citizen working as a contractor or consultant with a home office in Australia may or may not have a PE depending on the specific facts: casual work or work through a third-party intermediary typically does not create a PE, while a dedicated business office does.

If a US citizen operates an Australian business with a PE, that business is taxed in Australia at Australian company tax rates (currently 30% for larger companies). The US will also tax the profits on a worldwide basis, but will allow FTC for Australian tax paid, reducing the US tax owed. The interplay between Australian business structure (sole trader vs company) and US taxation requires careful planning to minimise the overall tax rate.

Capital Gains on Australian Property

The DTA allocates taxation rights for capital gains on tangible property (real estate) to the country where the property is located. This means capital gains from the sale of Australian property are always taxed by Australia, not the US. However, US citizens are also subject to US tax on worldwide capital gains, including gains on Australian property. The DTA does not eliminate US tax; it determines allocation of rights.

In Australia, capital gains on residential property are subject to capital gains tax (CGT) at the seller's marginal income tax rate. If the seller is a non-resident, there is no main residence exemption, and a Foreign Resident Capital Gains Withholding (FRCGW) of 15% of the sale price is held by the purchaser's solicitor and remitted to the ATO.

For a US citizen, the Australian CGT liability is calculated first. The US then taxes the same gain on the citizen's US return. The US FTC allows a credit for Australian tax paid, reducing US tax on that gain. In practice, Australian CGT rates often exceed US federal rates, resulting in excess foreign tax credits.

A critical point: the US does not provide a 50% CGT discount for non-residents (as Australia does internally). From 1 July 2027, new legislation replaces the 50% CGT discount with cost-base indexation; residents can still use the discount for gains accrued before that date, and foreign residents generally cannot access it. A US citizen selling Australian property pays the full Australian CGT, and then pays US tax on the gain at US rates (0%, 15%, or 20% depending on income and holding period). The FRCGW of 15% is a withholding on account of Australian tax only and does not satisfy US requirements; the US citizen must still file a US tax return reporting the gain.

Rental Income from Australian Property

Rental income from Australian property is taxed in Australia under the DTA, with Australia having primary taxing rights. However, US citizens are also subject to US tax on worldwide rental income, including income from Australian rental properties. Again, the DTA provides allocation of rights, not elimination of US tax.

In Australia, rental income is assessable income and is taxed at the owner's marginal rate. Non-residents are taxed at a flat 45% rate on rental income from Australian property (plus Medicare levy). Deductions for mortgage interest, rates, insurance, maintenance, and depreciation are available, and negative gearing (deductions exceeding income) can be carried forward.

A US citizen is also subject to US tax on the same rental income and deductions. The FTC for Australian tax paid reduces US tax. However, the US tax treatment of rental property deductions differs from Australia in some areas: US depreciation is calculated differently, and some Australian deductions may not be deductible in the US.

For US citizens, the complexity lies in reconciling the two systems' different deduction rules and ensuring compliance with both countries' reporting requirements. ODIN Tax handles the Australian side; a US tax advisor should coordinate on the US side to ensure consistency.

Superannuation Treatment Under the DTA

Australian superannuation receives concessional tax treatment: contributions are taxed at 15% (not the contributor's marginal rate), and investment earnings in super are taxed at 15% (not the contributor's rate). However, the US does not recognise Australian superannuation as a tax-advantaged retirement plan equivalent to a US 401(k) or IRA.

For US citizens, contributions to Australian super are NOT deductible in the US. A US citizen contributing to Australian super must still include that contribution amount in their US taxable income. This creates double taxation on the contribution itself: the contribution is made from after-tax (US-taxable) income and then taxed again by Australia at 15%.

When super is withdrawn or paid out as a lump sum (e.g., on return to the US), the US will tax the distribution as income. The 15% tax withheld by the Australian super fund is a tax credit against US tax owing. For US citizens, superannuation planning requires coordination with US tax advice to determine whether Australian super contributions are still beneficial given the US treatment.

Super death benefits, rollovers between funds, and preservation rules add further complexity. The DTA does not provide relief for these mismatches; only careful US tax planning can minimise the impact.

FBAR and FATCA Compliance

FBAR (Foreign Bank Account Report, FinCEN Form 114) must be filed if a US citizen has "financial interest in or signature authority over" foreign bank accounts totalling more than USD 10,000 at any time during the year. Australian bank accounts—including everyday transaction accounts, savings accounts, and investment accounts—are foreign accounts.

FBAR is filed online with FinCEN (not the IRS) and has no statute of limitations for willful violations. Penalties for non-compliance are severe: up to USD 10,000 per year for non-willful violations or 50% of the balance in the account for willful violations. Many US citizens in Australia are unaware of FBAR requirements and face substantial exposure.

FATCA (Form 8938) is filed with the US tax return and requires US persons to report foreign financial assets (including bank accounts, investments, and real estate) above certain thresholds. For US citizens living abroad, the threshold is USD 200,000 (single) or USD 400,000 (married filing jointly) at year-end. Failure to file Form 8938 results in a USD 10,000 penalty plus interest.

For a US citizen in Australia holding Australian bank accounts, investment accounts, and owning Australian property, both FBAR and FATCA compliance is mandatory. These are separate filings with different rules and penalties. ODIN Tax does not file US tax returns, but we can ensure clients understand the requirement and coordinate with their US advisor to ensure timely filing.

Social Security and Totalization

The US and Australia have a Social Security Totalization Agreement that prevents dual social security contributions. A worker in Australia covered by the Australian superannuation system is generally exempt from US Social Security tax (FICA) on wages earned in Australia.

However, self-employed persons may still be subject to US self-employment tax even while contributing to Australian super. This requires careful planning, particularly for US citizens running Australian businesses. The totalization agreement is complex and requires review on a case-by-case basis.

Practical Scenarios

Scenario 1: US Citizen Working in Australia. Sarah is a US citizen (green card holder) living in Sydney, working as a software engineer for an Australian tech company. She earns AUD 150,000 per year. She has a home loan and is renting out a property in the US. She also holds Australian superannuation. Sarah must file a US tax return every year reporting her Australian wages (eligible for FEIE up to USD 126,500), her US rental income, and her super contributions (non-deductible in the US). She must file FBAR and Form 8938 reporting her Australian bank accounts and property. She must coordinate with a US tax advisor on FEIE vs FTC strategy and ensure her US rental income deductions are claimed correctly. ODIN Tax calculates her Australian tax; her US advisor handles the US return.

Scenario 2: US Citizen Purchasing Australian Property. James is a US citizen living in Melbourne. He is purchasing an investment property in Brisbane for AUD 500,000. He must understand that when he sells this property in the future, he will owe both Australian CGT (at his marginal rate, likely 45% as a non-resident, plus Medicare levy) and US tax (at US rates). The Australian tax is credited against US tax, but he must file a US return reporting the gain. He should also plan for FRCGW (15% withholding on sale) and ensure he has funds to cover potential US tax owing at the time of sale.

Scenario 3: Australian Returning from the US. Michael is an Australian citizen returning to Australia after 10 years working in the US. He is bringing superannuation contributions from a US 401(k) and has capital gains from the sale of a US home. For the US side: Michael must file a final US return and potentially claim expatriate status to limit FATCA reporting after departure. For the Australian side: Michael brings funds to Australia and may need to assess Australian tax residency (generally, he becomes a resident when he arrives and establishes a permanent home). Any US super or 401(k) distributions in the future will be taxable in Australia. ODIN Tax advises on Australian tax position; a US advisor handles the US departure and final return.

Common Mistakes US Citizens Make

1. Not Filing US Tax Returns. Many US citizens assume that if they pay Australian tax, they don't need to file with the US. Wrong. The requirement to file exists regardless of whether tax is owing. Failing to file exposes the person to penalties and interest, and in egregious cases, criminal prosecution.

2. Not Claiming the Foreign Earned Income Exclusion (FEIE). FEIE can exclude over USD 126,000 from US taxation, but it must be claimed. Many US citizens unknowingly pay US tax on income they could have excluded. The exclusion is not automatic; it must be elected on the US return.

3. FBAR Violations. Many US citizens are unaware of FBAR requirements. Opening an Australian bank account and not filing FBAR triggers penalties. FBAR is filed online with FinCEN (not the IRS) and is separate from the income tax return. Penalties are severe.

4. Superannuation Misclassification. Some US citizens assume Australian super is treated like a US 401(k) and is not taxable in the US. This is false. Super contributions are not deductible in the US; the US taxes the person on the contribution amount and again on withdrawals.

5. Not Filing Australian Tax Returns. Some US citizens in Australia assume they don't need to file in Australia because they are US citizens. Wrong. If you are a resident of Australia for tax purposes, you must file an Australian tax return and pay Australian tax. The US and Australian tax systems are independent; compliance with both is mandatory.

How ODIN Tax Can Help

ODIN Tax specialises in the Australian side of expat taxation. We calculate your Australian tax obligations, identify deductions and concessions you may be eligible for, and lodge your Australian return. We also coordinate with your mortgage and investment property structure to optimise your overall tax position within Australia.

However, US taxation is complex and requires a US-qualified tax advisor (CPA or tax attorney). We strongly recommend you engage a specialist US expat tax advisor in parallel. ODIN Tax can provide your Australian tax position and coordinate with your US advisor to ensure consistency and avoid duplication or gaps. The US side of your tax return is your responsibility to arrange with a qualified US advisor.

Our role is to ensure the Australian side is correct, efficient, and optimised. Your US advisor's role is to ensure the US return is filed correctly and that you're claiming all available benefits (FEIE, FTC, FBAR, FATCA, etc.). Together, we help you navigate this complex bilateral tax environment.

Frequently Asked Questions

Q: Do I have to file a US tax return every year?
A: Yes, if you are a US citizen or green card holder with income exceeding the annual filing threshold (approximately USD 12,550 for 2023 for a single person). This is true regardless of where you live or whether you expect to owe US tax. Filing is mandatory.

Q: Can I just use the Foreign Earned Income Exclusion and avoid all US tax?
A: Not entirely. The FEIE excludes earned income up to USD 126,500 (2024), but it does not apply to unearned income (rental income, dividends, capital gains, interest). If your income exceeds the FEIE limit or includes significant unearned income, you will owe US tax even after claiming FEIE.

Q: If I pay Australian tax, do I get credit for it against US tax?
A: Yes, through the Foreign Tax Credit (FTC). However, FTC is limited and complex; it applies per income basket (ordinary income, capital gains, etc.). In many cases, Australian tax paid exceeds the US tax on that income, resulting in excess FTC that may be carried forward. A US tax advisor should calculate your specific FTC position.

Q: What is FBAR and do I need to file it?
A: FBAR is the Foreign Bank Account Report (FinCEN Form 114). You must file it if you have foreign bank accounts (including Australian accounts) totalling more than USD 10,000 at any time during the year. Filing is mandatory and penalties for non-compliance are severe. FBAR is filed online with FinCEN, not the IRS.

Q: Is my Australian superannuation treated like a US 401(k)?
A: No. The US does not recognise Australian super as a qualified retirement plan. Contributions are not deductible in the US, and the US taxes you on the contribution amount. Withdrawals are also taxable in the US. This is a significant disadvantage for US citizens and requires careful planning with a US tax advisor.