File US taxes from Australia: 2025 guide for Americans (filed in 2026)
Updated on April 20, 2026
Written by: Clark Stott
Reviewed by: Seth Hertz
In this article
If you’re a US expat living in Australia, filing taxes can feel like you’re dealing with two systems that don’t quite speak the same language. You may be working in Sydney and paying tax to the Australian government. From a local perspective, everything is covered. But the US tax system works differently. It follows you based on citizenship, not where you live.
The good news is that most US expats in Australia do not end up paying tax twice. With tools like the Foreign Earned Income Exclusion and the Foreign Tax Credit, it is often possible to reduce or eliminate US tax liability.
This guide explains how it works. It breaks down who needs to file, how to file US taxes from Australia, and what to watch for if you earn, save, or invest abroad.
Do US citizens in Australia need to file US taxes?
Yes. If you’re a US citizen or Green Card holder living in Australia, you generally must file a US tax return if your income exceeds IRS thresholds. Start by checking your filing status and comparing your total income to the 2025 limits below.
Who needs to file US taxes from Australia?
You must file a US tax return if your income exceeds IRS thresholds. Start by checking your filing status and comparing your total income to the 2025 limits below.
For the 2025 tax year, filed in 2026:
|
Filing status |
Minimum income |
|
Single |
US$15,750 |
|
Married filing jointly |
US$31,500 |
|
Married filing separately |
US$5 |
|
Head of household |
US$23,625 |
|
Self-employed |
US$400 |
US tax deadlines for Americans in Australia (2025 returns)
Most US expats in Australia get an automatic extension to June 15, 2026, but interest still starts from April 15.
Here’s how the timeline works:
- April 15, 2026: Standard US tax filing deadline
- June 15, 2026: Automatic extension on tax filing for US expats
- October 15, 2026: Additional extension with Form 4868
How to file US taxes from Australia (step-by-step)
Filing US taxes from Australia involves reporting worldwide income, applying tax relief, and submitting required forms such as Form 1040 and the FBAR.
Step 1: Gather your income
The IRS requires you to report global income, which includes:
- Australian salary or wages
- Business income
- Investment income (dividends, capital gains)
This also includes any income from other countries, even if it was already taxed locally.
Step 2: Convert income to US dollars
All US tax reporting must be in USD. You can typically use:
- An annual average exchange rate (common for salary)
- A spot rate (for one-time transactions)
In practice, most expats use an average rate for simplicity.
Step 3: Choose your tax strategy
You’ll generally choose between:
- Foreign Earned Income Exclusion (FEIE)
- Foreign Tax Credit (FTC)
Many expats assume FEIE is the default option. In Australia, that’s often not the case. The FTC often works better in Australia because local tax rates are higher. This usually allows you to fully offset your US tax, and in many cases reduces it to zero
Step 4: Complete your US return
Once your income and strategy are set, you prepare your US return and attach the necessary forms. This usually includes:
Step 5: Report foreign accounts
If you have financial accounts in Australia, you may need to report them separately from your tax return, which includes:
- FinCEN Form 114
- Form 8938 (if applicable)
Step 6: File before the deadline
Submit your return by the applicable deadline, taking advantage of expat extensions if needed.
- Automatic extension to June 15
- Optional extension to October 15
🔑 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.
Living in Australia with US tax obligations? Reach out now for support.
How to avoid double taxation (FEIE vs FTC)
Most US expats in Australia avoid double taxation using either the Foreign Earned Income Exclusion or the Foreign Tax Credit.
Foreign earned income exclusion (FEIE)
FEIE allows you to exclude up to US$130,000 of foreign earned income for 2025.
- Filed using Form 2555
- Applies to earned income only
- Requires residency or presence tests
Good for:
- Lower to mid-income earners
- Those with minimal foreign tax paid
Foreign tax credit (FTC)
FTC lets you claim a credit for Australian taxes paid, often reducing your US tax to zero.
- Filed using Form 1116
- Applies to more income types
- Can be carried forward
FEIE vs FTC: which is better in Australia?
In Australia, most US expats end up using the Foreign Tax Credit because Australian taxes are often higher than US taxes, but the right choice depends on your income type and long-term situation.
|
Factor |
FEIE |
FTC |
|
Covers |
Earned income only |
Most income |
|
Best for |
Lower income |
Higher-tax countries |
|
Australia relevance |
Limited |
Often preferred |
How to decide
Instead of thinking in theory, here’s how most expats approach it:
Use FEIE if:
- Your income is below the exclusion limit (US$130,000 for 2025)
- You want a simpler filing structure
- You don’t have much Australian tax paid
Use FTC if:
- You’re paying significant Australian tax
- You have investment income (dividends, capital gains)
- Your income exceeds the FEIE limit
- You want to preserve credits for future years
You’re also not limited to choosing just one. In some cases, you can use both FEIE and FTC, but on different types of income. That said, it requires careful allocation.
Using both without a clear structure can lead to overlap or reduce the benefit of each.
US vs Australia tax year differences
The US and Australia use different tax years, which can make timing your income and tax credits more complicated than they first appear.
- The US tax year starts on January 1 to December 31
- Australian tax year starts on July 1 to June 30
This mismatch affects how you claim the Foreign Tax Credit. You may need to estimate Australian tax for your US return because the reporting periods do not fully align.
For example:
- Your US return (2025) uses calendar-year income
- Your Australian tax paid may span two tax years
This creates a timing gap when claiming the Foreign Tax Credit.
Most expats deal with this in one of two ways.
- Some use reasonable estimates. They estimate the Australian tax paid for the US reporting period. If needed, they adjust the figures later.
- Others use actual amounts paid. They rely on taxes paid during the calendar year. If there are unused credits, they carry them forward.
Both approaches can work. The key is to stay consistent.
US-Australia totalization agreement
The US-Australia totalization agreement helps ensure you don’t pay social security taxes to both countries on the same income. It determines whether you contribute to the US Social Security or the Australian Superannuation.
This is separate from income tax. It applies specifically to social contributions, not your main tax return.
Typically, if you work for an Australian employer:
- You generally contribute to the Australian superannuation
- You usually don’t pay US Social Security
If you’re temporarily assigned from the US, then you may continue paying into the US Social Security.
What about self-employed individuals?
This is where things get more complex. Depending on your setup, you may still be subject to US self-employment tax, even if you’re paying into Australian systems.
This means you should check how your work is structured. If you are self-employed, review whether you are still subject to the US self-employment tax.
How to convert Australian income to US dollars
You must report all income in US dollars, so your first step is converting your Australian income into USD using a consistent method. Most expats use one of two approaches:
- Annual average exchange rate: This works well for salary or regular income. It keeps things simple and consistent across the year.
- Spot rate: This is more precise and is usually used for one-off transactions, such as selling shares or receiving a lump sum.
In practice, most people use the average rate for income and reserve spot rates for specific events.
If you switch methods without a clear reason, it can create discrepancies in your reporting. A practical way to handle this is to choose a method early. Then apply it across all income types where appropriate. Keep a record of the rate you used in case you need to explain it later.
Reporting foreign accounts: FBAR and FATCA
If you hold financial accounts in Australia, you may need to report them separately under FBAR and FATCA rules, even if no tax is owed.
FBAR (foreign bank account report)
You must file an FBAR if your aggregate total foreign account balances exceed US$10,000 at any point during the year.
This includes:
- Bank accounts
- Savings accounts
- Some investment accounts
Add the highest balance of all your foreign accounts during the year. If the total exceeds US$10,000 at any point, you must file an FBAR. The FBAR is filed separately from your tax return using FinCEN Form 114.
FATCA (Form 8938)
FATCA requires reporting of foreign financial assets, but only if you exceed higher thresholds.
This is filed with your tax return using Form 8938. The thresholds are much higher than FBAR. So not everyone needs to file it.
The safest approach is to check both thresholds early. Don’t assume one replaces the other. They serve different purposes.
What forms do you need to file?
Most US expats in Australia file Form 1040, but the additional forms depend on how your income and assets are structured.
From there, you add forms based on your situation.
- If you are excluding income, you use Form 2555
- If you are claiming credits, you use Form 1116
- If you hold foreign accounts, you may need to file an FBAR or Form 8938 for FATCA reporting
- If you invest in non-US funds, you may need Form 8621
- If you are reporting ownership in a foreign company, you use Form 5471
Net investment income tax (NIIT) for US expats
Some US expats may owe an additional 3.8% tax on investment income if their total income exceeds certain thresholds.
This applies to:
- Dividends
- Interest
- Capital gains
The thresholds are:
- US$200,000 for single filers
- US$250,000 for married couples
This is often missed because many expats focus only on earned income.
There are two key points to keep in mind.
First, the FEIE does not reduce exposure to NIIT. Even if your salary is excluded, your investment income can still be taxed.
Second, the Foreign Tax Credit may help offset it. But that depends on how your foreign taxes are categorized.
What you should do:
If your income is approaching these thresholds, look at your investment income separately. Don’t assume it is covered by your main tax strategy.
How does the US treat Australian superannuation?
Superannuation is not treated the same as a US retirement account. The tax treatment depends on the type of fund and how much control you have over it.
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.
Australian investments (PFIC rules)
Many Australian-managed funds are classified as PFICs under US tax rules. This triggers additional reporting using Form 8621.
PFIC rules are complex and often unfavorable from a US tax perspective. This is why some expats rethink how they invest after moving abroad.
Can you include a non-US spouse on your US tax return?
You can elect to treat a non-US spouse as a US resident and file a joint return, but this decision has trade-offs.
Filing jointly can increase your standard deduction. It may also reduce your tax liability in some cases. However, it also means your spouse’s worldwide income becomes subject to US taxation.
This election is optional and not always beneficial. It depends heavily on income levels and structure. A practical way to approach this is to compare both scenarios. Run the numbers with and without the election before deciding.
Example: filing US taxes from Australia
Many US expats in Australia end up owing little or no US tax after applying the Foreign Tax Credit.
Consider a simple scenario:
A US citizen works in Sydney and earns US$90,000. They pay Australian income tax on that salary.
When they file their US return, they claim the Foreign Tax Credit. The Australian tax paid offsets the US tax liability. In many cases, this reduces the US tax owed to zero or close to it.
This is a common outcome because Australian tax is often high enough to offset US tax. However, the result depends on your income type and how credits are applied.
Common mistakes US expats in Australia make
- Most issues are not caused by unpaid tax. They come from missed reporting, especially FBAR, foreign assets, and investment disclosures.
- Some expats assume they don’t need to file because they already pay tax in Australia.
- Others miss FBAR reporting because they don’t realize the threshold is based on combined balances.
- Some rely too heavily on FEIE and overlook FTC or investment income.
- Others invest in non-US funds without understanding PFIC rules.
- Many misunderstand how superannuation is treated under US tax law.
Filing US taxes from Australia FAQs
-
Do I need to file US taxes if I earn below the threshold in Australia?
Not always, but it depends on your situation, especially if you are self-employed or have foreign accounts.
If your income is below the filing threshold, you may not need to file a return. However, if you are self-employed, the US$400 rule still applies. You may also still need to file an FBAR if your accounts exceed the reporting threshold.
A practical approach is to check both your income level and your account balances before deciding not to file.
-
Can I file US taxes before completing my Australian tax return?
-
What happens if I haven’t filed US taxes while living in Australia?
-
Do I need to file US taxes if I only earn income in Australia?
-
Does the US-Australia tax treaty eliminate double taxation completely?
-
Should I use an accountant or file on my own?
Clark Stott has been with Expat Tax Online since 2015. Being a dual national based in the UK, Clark has unique experience helping US citizens (and Accidental Americans) become tax compliant via the Streamlined Tax Amnesty program. Clark likes to help Americans in the UK keep their tax situations as simple as possible to avoid harsh IRS treatment.
