Retiring in Australia with a US passport (or Green Card): the tax problem nobody warned you about

The United States is one of only a small handful of countries — and the only major one — that taxes its citizens and Green Card holders on their worldwide income, regardless of where they live. For an Australian retiree who also holds US citizenship (a dual citizen, an "accidental American" born in the US, a long-term US resident who naturalised) or a current — or never-formally-surrendered — US Green Card, that means two tax systems, every year, for life, until either the US status is given up (with potential exit-tax consequences) or the person dies. The US–Australia Double Tax Agreement and foreign tax credits mitigate most of the actual double tax — Australia's tax rates exceed US rates at most income levels, so the Australian tax usually covers the US liability with credit to spare (ATO, https://www.ato.gov.au/individuals-and-families/income-deductions-offsets-and-records/offsets-and-rebates/foreign-income-tax-offset) — but they don't fix the annual filing obligation in both countries, and they don't fix four specific, structural problems that hit Australian retirees with US status particularly hard. This article walks through those four — the tax treatment of Australian managed funds and ETFs (PFICs), the unsettled US treatment of Australian superannuation, FBAR and FATCA reporting on Australian financial accounts, and the exit tax on renouncing US citizenship or surrendering a long-held Green Card. The central message: this is not a topic for an Australian-only adviser. Australian retirees who are US persons need a dual-qualified Australia–US tax specialist, and they need one early. (The US figures below are current US Internal Revenue Service rules, most of them indexed annually, and should be confirmed with a specialist.)

Who counts as a "US person" for tax purposes?

The first question is who counts as a US person, and the answer surprises people. US citizens are US persons regardless of how the citizenship was acquired — including those born in the US to non-US parents, those born abroad to US-citizen parents (the so-called accidental Americans), and naturalised citizens — and citizenship doesn't expire with absence. Green Card holders remain US tax residents until the Green Card is formally abandoned with US immigration authorities (via Form I-407), not simply allowed to expire. A common trap: an Australian retiree who held a Green Card during a US work assignment decades ago, returned to Australia, and stopped using the card may still be a US tax resident if they never formally surrendered it. And long-term Green Card holders — those who held the card in at least 8 of the prior 15 years — are exposed to the exit-tax rules on surrender, the same as US citizens. Identifying US status accurately is the starting point for every other decision in this article.

How much does the Foreign Tax Credit actually help?

A US-person Australian retiree files a US Form 1040 every year (due 15 April, with an automatic extension to 15 June for residents abroad and further extensions available) and an Australian return. US tax is generally creditable in Australia under the foreign income tax offset rules (ATO, https://www.ato.gov.au/individuals-and-families/income-deductions-offsets-and-records/offsets-and-rebates/foreign-income-tax-offset), and Australian tax is generally creditable in the US. For ordinary income — wages while still working, Australian dividends and interest, capital gains on most assets — the higher of the two countries' taxes is the effective rate, and because Australia's rates exceed US rates at most levels, the Australian tax usually wipes out the US liability with credit to spare, so the actual double tax is small. Where foreign tax credits fail is where the US imposes tax on income or gains that Australia exempts or taxes very lightly — there is no Australian tax to credit, and the US tax becomes a real cost. That is exactly where the structural problems below bite.

What is the PFIC problem?

The first and most common trap is the Passive Foreign Investment Company (PFIC) — under US tax rules, a non-US corporation where most of its income or assets is passive. Almost every Australian managed fund, ETF, listed investment company, and many SMSF investment vehicles is a PFIC from the US perspective. Under the default US treatment, gains and "excess distributions" from PFICs are taxed at the highest US ordinary income rates (currently up to 37%), with an interest charge added back to when the gains accrued, denying long-term capital-gains treatment entirely. Optional elections (QEF or mark-to-market) can be made, but they require the fund to provide US-format reporting that Australian funds almost never produce. On top of that, Form 8621 must be filed annually for each PFIC held — administratively expensive even before the punitive tax. The practical answer for US persons in Australia is that the standard Australian portfolio (diversified shares via managed funds or ETFs) is a minefield; the cleaner positions are direct Australian shares (which aren't PFICs), US-domiciled funds held via a US brokerage, or specific structures designed to sidestep PFIC characterisation. This decision needs to be made before the money goes in — restructuring after the fact triggers gains on the existing PFIC holdings.

Why is Australian super's US treatment uncertain?

The second structural problem is Australian superannuation, and the honest answer is that there isn't a clean one. The IRS has not issued comprehensive guidance on how to treat Australian super, and practitioners take genuinely different positions: some treat super as a foreign grantor trust (with the member as grantor, and Forms 3520 and 3520-A required annually); others as an employee benefit plan under §402(b) (with employer contributions and possibly earnings currently taxable to the member); others argue treaty-based deferral. The US–Australia treaty does not clearly defer US tax on Australian super in the accumulation phase. The conservative position is that Australian super contributions — employer Superannuation Guarantee, salary sacrifice, or personal deductible contributions — may be currently taxable in the US to a US-person member, and the Australian 15% fund-level tax doesn't generate a credit to the member personally, because Australia doesn't tax super contributions in the member's own hands. When pension or lump-sum withdrawals start, the US treatment depends on the prior characterisation. A specialist will help the client take a defensible position; the worst outcome is filing nothing and discovering the problem during an IRS audit a decade later.

What are the FBAR and FATCA reporting obligations?

The third structural problem, and the highest-penalty risk, is the reporting regime. The FBAR (FinCEN Form 114) requires US persons whose aggregate foreign financial accounts exceed USD $10,000 at any point in the calendar year to file an annual report, separately from the tax return, covering Australian bank accounts, broker accounts, super accounts, and arguably some life-insurance products. Wilful FBAR non-filing carries penalties of the greater of around USD $100,000 (indexed) or 50% of the account balance, per year; non-wilful non-filing can still draw up to around USD $10,000 (indexed) per violation. These penalties have been litigated and are not theoretical. FATCA (Form 8938) is filed with the Form 1040 for US persons with specified foreign financial assets exceeding thresholds — roughly USD $200,000 at year-end or $300,000 at any point for an unmarried US person living abroad, higher for married couples. FBAR and Form 8938 overlap but cover slightly different asset sets, so both may be required. Critically, under the FATCA intergovernmental agreement, Australian financial institutions must report US-citizen and US-tax-resident account holders to the ATO, which makes that information available to the IRS (ATO, https://www.ato.gov.au/about-ato/tax-avoidance/international-exchange-of-information/automatic-exchange-of-information/foreign-account-tax-compliance-act) — so non-compliance is increasingly visible. For US persons who have never filed, the IRS Streamlined Filing Compliance Procedures allow a one-time catch-up under a non-wilful certification without the criminal-penalty risk — but it is a specialist procedure and available only once.

What is the exit tax?

The fourth structural problem is the exit tax, and it is what makes renunciation a much bigger decision than people expect. A US citizen who renounces, or a long-term Green Card holder who surrenders, is a "covered expatriate" if they meet any of three tests: net worth of at least USD $2 million; average annual US income-tax liability over the prior five years above an indexed amount of roughly USD $200,000; or failure to certify five years of US tax compliance. A covered expatriate is treated as having sold all worldwide assets at fair market value the day before expatriation, with gains above an indexed exclusion of around USD $890,000 taxed at US capital-gains rates (and certain items at ordinary rates). Deferred items such as IRAs and deferred compensation have their own deemed-distribution rules. For wealthier Australian retirees with US citizenship, the exit tax can be a multi-six-figure cost; for those with limited US connections and modest wealth, renunciation can be a sensible long-term solution. The point is that it is a planned decision needing six to twelve months of specialist input, not a casual fix.

What does the US-person Australian retiree problem look like in practice?

These two cases show the US-person Australian retiree problem in practice. They are illustrative only and not personal advice; specialist Australia/US tax input is essential.

Charlie, 67, was born in Boston to American parents who moved to Sydney when he was a baby. He has lived his entire adult life in Australia, holds an Australian passport, and assumed his US citizenship was "just paperwork". He has about $1.2 million in an Australian super pension, $400,000 in an Australian-domiciled balanced ETF, a joint bank account with his Australian-citizen wife, and has never filed a US tax return. On these facts, Charlie has every one of the four structural problems at once. His citizenship is intact (US citizenship doesn't lapse with absence), so he should have been filing US returns and FBARs for decades. His Australian ETF is almost certainly a PFIC — gains taxed at top US ordinary rates with an interest charge, and a Form 8621 each year. His Australian super sits in unsettled territory, with contributions and earnings potentially currently US-taxable and possibly Form 3520/3520-A reporting on top. His bank account crosses the FBAR threshold easily, and the ATO is already reporting his US-person accounts to the IRS under FATCA (ATO, https://www.ato.gov.au/about-ato/tax-avoidance/international-exchange-of-information/automatic-exchange-of-information/foreign-account-tax-compliance-act). On these facts it is generally rational to refer immediately to a dual-qualified Australia/US tax specialist; explore the Streamlined Filing Compliance Procedures to come into compliance for prior years; restructure the ETF holding (likely selling and moving to direct Australian shares or US-domiciled funds, accepting the gain in the year of restructure); take a documented position on his super; and consider, with specialist input, whether renunciation makes long-term sense, running the covered-expatriate maths against the ongoing compliance cost. Charlie's case is overwhelming on first contact but tractable with the right help, and the cost of inaction is far worse than the cost of fixing it.

Marlena, 70, held a US Green Card during 11 years working in California in her thirties and forties. She returned to Sydney in 2002, let her US driver's licence and bank accounts close, and assumed her Green Card "expired" with the printed expiry date in 2006. She has never filed a US return since returning. She has $900,000 in super (largely in pension phase), $200,000 in an Australian managed fund, and her late mother's house, recently inherited. On these facts, the critical first question is whether Marlena ever formally surrendered her Green Card by filing Form I-407 — and she didn't. If she didn't, she is almost certainly still a lawful permanent resident for US tax purposes, because the printed card expiry doesn't end US tax residence. That means she has been a US tax resident the whole time she has been back in Australia, with all the filing obligations Charlie has, plus long-term-resident status (the Green Card held in more than 8 of the prior 15 years) that brings her into the exit-tax regime if she now surrenders. On these facts it is generally rational to engage a dual-qualified specialist immediately, model the exit tax against her net-worth and average-tax position before lodging the I-407 surrender, use the Streamlined Procedures for prior-year filings, and take a defensible position on her super and the inherited house (which has its own foreign-gift reporting implications under the Form 3520 thresholds for foreign inheritances). The structural lesson is that a Green Card doesn't expire the way people assume — it has to be formally surrendered, and the timing of that surrender matters for the exit tax.

For Australian retirees who are US citizens or Green Card holders, the standard Australian retirement playbook has to be re-examined through the US tax lens before any of it can be applied. The work is to identify US status accurately (ask directly, don't wait), to refer to a dual-qualified Australia/US tax specialist as the central recommendation (the annual fee — often AUD $3,000 to $10,000 or more for moderately complex situations — is the cost of doing business for this cohort), to audit current investments for PFIC exposure and restructure where needed, to take a defensible position on Australian super under the unsettled IRS framework, to maintain disciplined FBAR and FATCA filing (and use the Streamlined Procedures where there is a history of non-filing), and to model renunciation carefully where it might be the right long-term answer, including the exit-tax consequences for covered expatriates. The message most US-person clients need to hear early is the one their Australian accountant probably hasn't given them: the standard Australian advice — diversify with managed funds and ETFs, build up super, run an account-based pension in retirement — is the wrong shape for them without US-side coordination, and the penalties for missing the US requirements are severe enough that the problem cannot be ignored into retirement. The US figures move with US law and indexation, so confirm the current thresholds, rates, and forms with a dual-qualified specialist before relying on them — but the shape of the problem, and the need to engage specialists, is durable.

Sources

• ATO — Foreign Account Tax Compliance Act (FATCA)
• ATO — Foreign income tax offset