Before You Build Australian Super to $3 Million: US Tax Questions for Dual Citizens and Green-Card Holders
Current as at 14 September 2026.
For a high-income couple living in Australia, building substantial wealth inside superannuation can be an obvious part of long-term retirement planning.
Employer contributions continue to accumulate. Additional concessional contributions may be available. Members with sufficient capacity can also move substantial after-tax capital into super through the non-concessional contribution rules.
For Australian purposes, the strategy can be compelling.
For a US citizen or US green-card holder, the question is harder:
If we deliberately build Australian super towards $3 million each, will the US tax system undo the benefit we are trying to create?
That is a real planning question.
It is also one that is easy to answer too casually.
Australian superannuation does not come with a single, universally settled US tax treatment. The outcome can depend on the legal character of the fund, how contributions have been made, what the fund holds, how it has previously been reported to the IRS and what the member intends to do next.
For a couple considering six-figure voluntary contributions, those issues are worth understanding before the money is committed.
The first difficulty is that the two countries are looking at the same asset through different systems
Australia sees an APRA-regulated industry or retail fund as part of its statutory retirement framework.
The United States asks its own tax questions.
US law contains separate regimes for employee trusts, foreign trusts, grantor ownership, pensions and deferred-compensation arrangements. There is no simple rule under which every Australian industry or retail super fund receives identical US treatment.
That is why statements such as “Industry super is tax-deferred in the US” or “Only SMSFs create US problems” should be treated with caution.
An SMSF can present additional US issues because of member control and the structure of the fund. An industry or retail fund is a different proposition and may be considerably easier to deal with.
That still leaves a US classification question to resolve.
For someone deciding whether to add another $130,000 or $390,000 to super, that distinction matters.
A large voluntary contribution can change the nature of the problem
Many Australian employees build super for years largely through employer contributions.
The position can look quite different when the member begins moving substantial personal wealth into the same account.
A high-balance super account may contain Superannuation Guarantee contributions, salary-sacrifice amounts, personal deductible contributions and personal after-tax non-concessional contributions.
Australia places those amounts into familiar concessional and non-concessional categories.
US tax law does not necessarily follow those labels.
Employer-funded contributions arise through the employment relationship. A member personally transferring $130,000 or $390,000 of after-tax wealth into the arrangement is making a different economic contribution.
That difference can matter.
The practical issue for a US-connected member is therefore not simply whether the existing fund is acceptable from a US perspective. A substantial change in the contribution pattern can itself create new questions.
That is exactly the point at which prospective advice becomes more valuable than reconstructing the position after year-end.
The Australian contribution rules can force the decision earlier than many people expect
The $3 million Division 296 threshold attracts most of the attention.
It is not the only threshold that matters.
For the 2026–27 financial year, the general concessional contribution cap is $32,500 and the general non-concessional contribution cap is $130,000. An eligible member can potentially contribute up to $390,000 under the three-year bring-forward rules.
A prior 30 June total super balance below $1.84 million can permit the full three-year bring-forward. A balance from $1.84 million to below $1.97 million can permit $260,000. A balance from $1.97 million to below $2.1 million leaves the ordinary $130,000 cap. At $2.1 million or more, the non-concessional contribution cap is nil.
The practical consequence is significant.
Someone planning to “build super to $3 million” may lose the ability to make further non-concessional contributions well before reaching that target.
For a dual-national household, this can produce a narrow planning window.
The couple may still have Australian contribution capacity today while the US consequences of using that capacity remain unresolved.
That is a very different problem from simply asking how much super someone can ultimately hold.
Division 296 is now part of the economics
Division 296 applies from the 2026–27 income year.
The large superannuation balance threshold is $3 million. A separate very-large-balance threshold applies at $10 million. Both are indexed in later years.
The enacted regime differs materially from the earlier proposal that generated considerable concern about unrealised gains.
The final legislation uses statutory superannuation-earnings concepts tied to relevant fund tax outcomes, together with transitional CGT rules.
The tax is imposed on the individual member where the statutory conditions are satisfied.
For balances within the large-balance regime, Division 296 imposes tax at 15% on the relevant taxable superannuation earnings determined under the legislation. For very large balances, an additional 10% applies to the defined very-large-balance earnings component.
The first year also contains an important transitional feature. For 2026–27, the relevant calculations look to the member’s total superannuation balance at 30 June 2027.
For someone actively increasing their balance during the current year, Division 296 is therefore an immediate planning consideration.
Australian tax paid on super does not automatically close the US issue
Once Australian tax is imposed, the natural assumption is that a US foreign tax credit will deal with the double-tax problem.
Sometimes it may.
The position still needs to be worked through.
The US foreign tax credit rules look at the taxpayer who bears the foreign tax, the character of the tax, when it is paid or accrued and the US income against which the credit can be used.
Australia and the United States may also recognise income at different times.
That mismatch can be particularly important in a retirement structure where the Australian system and the US system do not necessarily recognise the same event in the same year.
At a $3 million balance, even relatively modest differences in annual tax treatment can compound into meaningful amounts over time.
The treaty does not give Australian super the same treatment as a US retirement plan
The Australia–US income tax treaty contains provisions dealing with pensions and annuities.
It also contains the US saving clause, under which the United States generally retains the right to tax its citizens as though the treaty had not entered into force, subject to specified exceptions.
The treaty does not contain a broad rule under which Australian super contributions and annual accumulation automatically receive the same treatment in the United States that they receive in Australia.
That gap is one of the reasons this issue persists.
A US citizen living permanently in Australia should therefore be cautious about assuming that an Australian industry fund operates, for US purposes, like a 401(k), IRA or other US-qualified retirement arrangement.
Choosing an industry or retail fund can be sensible without making the US analysis disappear
Many US-connected Australians are now wary of SMSFs.
That caution is understandable.
Member control, the trustee structure and the investments held through an SMSF can create additional US classification and reporting issues.
For some families, remaining in an APRA-regulated industry or retail fund is therefore a deliberate choice.
That can materially improve the factual position.
It does not produce an automatic US answer.
A high-balance industry fund can still raise questions around the contribution history, US income recognition, underlying investments and reporting.
The fund needs to be assessed as the arrangement it actually is.
The investments inside the fund may become relevant as well
Australian super funds commonly invest through managed funds, ETFs and other pooled investment vehicles.
Some foreign pooled investments can fall within the US passive foreign investment company regime.
Whether those investments create direct consequences for the member depends heavily on how the broader super arrangement is treated under US law.
That can have a significant impact on both compliance and tax.
This is another area where a confident answer based only on the Australian fund statement can be misleading.
Higher-income members can face additional US tax layers
Where the US treatment results in investment income being recognised currently, higher-income taxpayers may also encounter additional US taxes.
The 3.8% Net Investment Income Tax is one example.
Foreign tax credits that reduce ordinary US income tax generally do not directly reduce NIIT.
The precise relevance depends on how the super arrangement and the relevant income are treated.
For a high-income household, however, the cumulative effect can change the economics of the strategy.
Reporting is a separate source of risk
The tax outcome and the reporting outcome are not the same question.
A foreign pension or deferred-compensation interest can be reportable on Form 8938 where the relevant thresholds are met.
FBAR operates under a separate regime.
Foreign-trust reporting may require another analysis again.
Published IRS guidance provides relief for some qualifying foreign retirement arrangements, and proposed regulations also contain rules relevant to qualifying foreign retirement trusts.
Whether those relief provisions apply depends on the facts.
A substantial personal contribution can therefore matter for reasons extending beyond the Australian contribution cap.
For someone with a multimillion-dollar balance, consistency across the US filings becomes increasingly important.
Historic filings can matter more than people expect
A couple considering future contributions should also understand how the super fund has been treated on previous US returns.
The historic position may contain assumptions about ownership, trust status, foreign assets or income recognition that were never consciously revisited.
A materially different treatment in a later year can create questions of its own.
International information-reporting failures can also affect US limitation periods in certain circumstances.
For someone who has accumulated Australian super for ten or twenty years, reconstructing the past can become an important part of making the next decision safely.
Green-card holders can be exposed even when Australia is clearly home
This issue is not limited to US citizens.
An Australian citizen who still holds a US green card can generally remain a US resident alien for federal tax purposes.
That can continue even where the person lives permanently in Australia.
Treaty residence may be available in some dual-resident situations.
For long-term green-card holders, however, changing US residence status can itself have significant tax consequences.
A person who has held lawful permanent resident status for at least eight of the relevant fifteen tax years can fall within the US long-term-resident rules.
For a green-card holder with substantial Australian super, the super strategy, treaty position and future US status should therefore be considered together.
A couple aiming for $3 million each may have two very different answers
This is where the issue becomes particularly important for family planning.
One spouse may be a US citizen.
The other may hold a green card.
Their super balances may be different. Their historic contribution patterns may be different. Their existing US reporting positions may be different. Their remaining Australian contribution capacity may also be different.
A household target of “$3 million each” may therefore conceal two very different tax positions.
The right family allocation cannot be determined solely from the Australian contribution caps.
The question clients should be asking
For a high-balance Australia–US household, the decision is ultimately about where the family’s next dollar should go.
Australian super can remain a very attractive retirement structure.
US exposure does not automatically make it unattractive.
But the economics should be tested before significant additional capital is committed.
The answer can depend on the member’s US status, the way the super has been funded, the existing balance, the proposed contribution and the family’s longer-term plans.
For one spouse, further super contributions may remain compelling.
For the other, the US consequences may materially alter the outcome.
This is precisely the type of decision that becomes harder to unwind once the contribution has already been made.
If you are earlier in the issue and want the broader starting point, read Australian Super Can Become a US Tax Problem Before Retirement.
Review the Australia–US position before increasing contributions
Extax’s Australia–US Super Exposure Briefing is designed for US citizens and green-card holders who want to understand the cross-border implications of a substantial Australian super balance before making a major contribution, withdrawal or fund-structure decision.
For a high-balance household, the review can identify the principal Australian and US issues affecting the proposed strategy and whether more detailed specialist work is required.
Where appropriate, detailed US classification, investment, foreign-tax-credit, expatriation or reporting issues can then be separately scoped with the relevant specialist.
Frequently asked questions
Is an Australian industry super fund automatically tax-deferred in the United States?
There is no universal rule to that effect. The US treatment depends on the particular fund, the member’s position and the way the super has been funded.
Does using an industry fund instead of an SMSF improve the US position?
It can materially improve the factual position, particularly around member control. It does not remove the need to determine the US treatment of the particular arrangement.
Can I contribute $390,000 to super in 2026–27?
An eligible member may be able to use the three-year bring-forward rules to make non-concessional contributions of up to $390,000 in 2026–27. Eligibility depends on matters including the member’s total super balance and prior bring-forward position.
Does a $3 million balance stop further contributions?
The Division 296 threshold and the contribution-cap thresholds serve different purposes. Non-concessional contribution capacity can disappear before the member reaches $3 million.
Does Division 296 tax unrealised gains?
The enacted regime differs materially from the earlier proposal. The final legislation uses statutory earnings concepts linked to relevant fund tax outcomes and contains transitional CGT rules.
Do Forms 3520 and 3520-A always apply to Australian super?
No universal answer applies. Relief exists for some qualifying foreign retirement arrangements, but the relevant conditions need to be tested against the particular fund and contribution history.
Can investments inside Australian super create US tax issues?
Potentially. The answer depends on the treatment of the super arrangement and the nature of the underlying investments.
What if I am an Australian citizen living in Australia but still hold a US green card?
An active green card can continue to make the holder a US resident alien for federal tax purposes. Long-term green-card holders should also consider the consequences of any future change in US residence status.
Important information
This article provides general information only. It is not Australian or US tax, legal, financial or investment advice.
The US treatment of Australian superannuation is fact-dependent. Australian contribution limits, Division 296, US information-reporting obligations and US income-tax treatment should be confirmed for the relevant member and income year before a substantial contribution, fund-structure, residency or withdrawal decision is made.
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