Most Australian businesses don’t fail in the United States because the market rejects them. 

They fail because the structure underneath them wasn’t built for the way the US actually works.

From a distance, the US looks like one market. 

In practice, it’s a federal system sitting on top of fifty separate state regimes, each with its own tax rules, registration requirements, employment laws and compliance triggers. What works neatly in Australia can become awkward very quickly once you have people on the ground, customers in multiple states, or inventory crossing state lines.

That’s why the first mistake is usually asking the wrong question.

The question isn’t “Should we set up in Delaware?”
The real question is “What are we actually building in the US?”

If the plan is to test the water,  a small team, early customers, limited capital at risk and a structure that needs to stay flexible. If the plan is to scale, raise capital, issue equity to US hires and keep exit options open, the structure needs to look like something the US market already understands.

Most Australian businesses end up in one of those two lanes, whether they realise it or not.

Where the ambition is serious growth, the default answer is often a US C-Corporation. 

Not because it’s clever, but because it’s familiar. US investors, banks, lawyers and employees all know how to deal with it. Equity can be issued cleanly. Option plans work the way people expect. Governance is recognisable. Due diligence is faster because the shape of the company makes sense to the people looking at it.

The trade-off is that C-Corps come with formality and tax layering. There is corporate tax at the company level and tax again when profits are distributed. Board processes matter. Records matter. But that discipline is usually the price of admission if you want to play properly in the US growth market.

At the other end of the spectrum sits the LLC, which often gets sold as the “simple” option. And in the right circumstances, it can be. LLCs offer limited liability, fewer rigid corporate rules and a lot of flexibility in how economics and control are documented.

The catch though and it’s a big one for Australians is that simplicity in the US domestic context doesn’t always translate neatly across borders. The way an LLC is treated for US tax depends on elections and ownership, and foreign owners can find themselves pulled into US tax filings and reporting in ways they didn’t anticipate. Add state-level fees and compliance, and the “easy” structure can become anything but if it hasn’t been thought through properly.

That doesn’t make LLCs wrong. It just means they need to be chosen deliberately, not by default.

Then there are the structures that sound familiar but rarely fit. S-Corporations are popular with small US businesses, but they generally don’t work for Australian expansion because of tight ownership and equity restrictions. Partnerships can be excellent for joint ventures and specific commercial arrangements, but when foreign partners are involved, withholding and reporting obligations in the US can quickly outweigh the flexibility they offer.

What often gets missed entirely in early conversations is whether a US subsidiary is even the right first step. Some Australian businesses initially operate in the US as an Australian entity registered at the state level, particularly where activity is limited or transitional. In other cases, a clean US subsidiary is essential from day one to contain risk, satisfy customers or prepare for an eventual sale. There’s no universal rule but the choice has real consequences for liability, tax exposure and how easy it is to unwind or exit later.

Another blind spot is the assumption that incorporation solves everything. 

It doesn’t. In the US, obligations are driven less by where you’re incorporated and more by where you actually operate. 

Hire people in one state, warehouse goods in another, sell software into several more, and you can quickly find yourself dealing with multiple tax authorities and registration regimes. Sales tax in particular has a habit of appearing earlier than expected, especially for digital and e-commerce businesses.

And then there’s the question that almost always gets left until too late, how does the money come home?

Funding a US operation, charging for IP, repatriating profits and documenting intercompany arrangements are not clean-up exercises. 

They’re foundational. The longer they’re left, the more value gets trapped behind structures that weren’t designed to move it efficiently.

The same applies to people. The moment you hire in the US, everything becomes real, payroll, employment compliance, benefits, insurance, and expectations around equity. 

This is another reason growth-oriented businesses often gravitate to C-Corp structures early, US employees understand them, and equity incentives actually work the way they’re supposed to.

The pattern, after years of watching Australian businesses expand into the US, is fairly consistent. The companies that do well are not the ones with the cleverest structures. They are the ones that chose a structure that matched their ambition, accepted the discipline that came with it, and put the foundations in place before momentum made change difficult.

The ones that struggle usually weren’t reckless. They were just early optimists. They picked something that worked “for now” and assumed they’d fix it later. In the US, later tends to arrive during fundraising, diligence or a dispute when flexibility is at its lowest and the cost of change is at its highest.

General information only. Not advice. But if you’re planning a US expansion, it’s worth remembering this, the market is big, forgiving and full of opportunity but it has very little patience for structures that don’t match the story you’re trying to tell.

CHECKLIST: Australia – US Market Entry Checklist

“All happy families are alike; each unhappy family is unhappy in its own way.”

Leo Tolstoy’s Anna Karenina (1878)

Anna felt trapped in her high society marriage in 19th-century Russia. The divorce was frowned upon by the Orthodox Church. Thus, she did not formally divorce Karenin and instead ran off with Vronsky. While most divorces nowadays are less dramatic, they are still unpleasant for both parties and quite complicated. International divorce adds more complications, confusion, and frustration since the divorce process is rarely “just family law.” A decree may be issued under Australian law and negotiated entirely in Australia, but U.S. tax outcomes for a U.S. citizen can still turn on U.S. rules—especially rules that hinge on status (married vs not married), tax residency (resident vs non-resident alien), and ownership/control of offshore accounts and structures.

The key difficulty is that cross-border divorce compresses multiple high-stakes determinations into one year:

• Your U.S. filing status may be determined by what is true on December 31, even if you separated long before that. 
• If your spouse is a non-resident alien for U.S. tax purposes, you generally cannot file a joint return unless a specific election applies. 
• “Divorce transfers are tax-free” is not always true in international divorces because the U.S. divorce-transfer nonrecognition rule generally does not apply when the recipient spouse is a non-resident alien. 
• Divorce often changes ownership and signatory authority over foreign accounts, which can change offshore reporting responsibilities, especially FBAR and Form 8938.

U.S. Citizens Living Abroad: The Baseline Is “Worldwide”

A persistent misconception in expat divorces is that living abroad changes who is a U.S. taxpayer. It does not. The IRS’s Internal Revenue Manual states plainly that U.S. citizens living or traveling outside the United States are generally required to file U.S. income tax returns and report worldwide income. 

That’s the baseline. Even if foreign tax credits, exclusions, or treaty positions reduce U.S. tax, the filing and reporting framework still exists, and divorce often changes what must be reported.

Your Spouse: “Resident Alien” vs “Non-Resident Alien” Drives Most Cross-Border Outcomes

For U.S. tax purposes, an “alien” is anyone who is not a U.S. citizen. IRS Publication 519 explains the core split: aliens are classified as resident aliens and non-resident aliens;

Resident Aliens – are generally taxed on worldwide income,

Non-Resident Aliens – are generally taxed only on U.S.-source income and certain income effectively connected with a U.S. trade or business. 

The IRS also summarizes the practical mechanics of classification: an alien is a resident alien if he or she meets the green card test or the substantial presence test, or makes certain elections (including an election under IRC §6013(g) or (h)). If the person does not meet those tests and does not elect, that person is a non-resident alien and must file Form 1040‑NR to report certain U.S. tax items.

In a U.S./Australia or any other foreign divorce where the non-U.S. spouse lives outside of the U.S. and does not meet U.S. residency requirements, the spouse is commonly treated as a non-resident alien for U.S. tax purposes. That single fact ripples into filing status, withholding, and property transfer consequences.

Filing Status: Why December 31 Controls Even If Your Divorce Is “Non-U.S.”

The year-end rule is statutory, not a “paperwork” detail.

U.S. tax law generally determines whether you are married as of the close of your taxable year. The joint return statute, IRC §6013(d), similarly measures marital status as of the close of the year for spouses with the same taxable year, and provides that individuals legally separated under a decree of divorce or separate maintenance are not considered married. 

Practical Meaning – A divorce finalized in early January can mean you were “married” for U.S. tax purposes for the entire prior year.

“Legally Separated” Is Meaningful In The U.S. Tax Sense

IRC §7703 states that an individual legally separated under a decree of divorce or separate maintenance is not considered married. That phrase matters because not all “separation” ideas used in foreign jurisdictions map neatly to U.S. divorce or separate maintenance decrees. When your divorce is governed by foreign law, you still need to identify whether you have a decree that the U.S. tax rules treat as ending “married” status.

Head Of Household: Possible, But Facts Matter

Many separated expat parents are interested in the Head of Household (HOH) status. IRC §7703(b) provides a “certain married individuals living apart” rule that allows a married person filing separately to be treated as not married if they maintain a household that is the principal place of abode of a qualifying child for more than half the year, provide over half the cost of maintaining the household, and the spouse is not a member of the household during the last six months of the year. 

In international divorces, HOH analysis becomes fact-intensive quickly:

• where the child actually lived,
• who paid household costs,
• whether the spouse was a member of the household during the last six months,
• and dependency entitlement mechanics.

So, while HOH can be a valuable filing status, in cross-border divorce, it should be treated as a fact pattern to prove, not a default assumption.

Married To A Non-Resident Alien Spouse: Why Married Filing Joint (MFJ) Is Often Blocked And How Elections Change The Landscape

The default rule: no joint return if either spouse is a non-resident alien.

IRC §6013(a)(1) provides a clear limitation: no joint return shall be made if either spouse at any time during the taxable year is a non-resident alien. However, non-resident aliens married to U.S. citizens or residents can choose to be treated as U.S. residents and file joint returns.

This is the first major “international divorce fork”:

• If the foreign spouse remains a non-resident alien and no election is made, you may be limited to separate filing (and the spouse may file Form 1040‑NR for U.S. income items). 
• If you want MFJ, you are typically talking about a statutory election regime.

The §6013(g) election (and related rule §6013(h)): MFJ becomes a choice, not a default.

IRC §6013(g) allows spouses to elect to treat a non-resident alien spouse as a U.S. resident for (1) income tax for the entire year, and (2) wage withholding for wages paid during the year.

Regulation §1.6013-6 provides a clear summary of who can elect.  The election is made by either the husband or the wife at year-end, when one spouse is a U.S. citizen or resident, and the other is a non-resident alien. Once an election is made, each spouse is treated as a U.S. resident for various Internal Revenue Code purposes and specific filing/administrative provisions for the entire year. 

The election is made by attaching a statement to a joint return for the first year; the statement must include identification (U.S. Social Security or taxpayer identification numbers) and be signed by both spouses. 

The election terminates if spouses are legally separate under a decree of divorce or separate maintenance; the regulation also provides timing for termination. 

Therefore, if you make the election, you and your spouse are treated as residents for income tax purposes for the entire year; neither spouse can claim under any treaty not to be a U.S. resident; both are taxed on worldwide income; you must file a joint return for the year you make the choice.

US Taxpayer Identification (ITIN) Mechanics

If the non-resident spouse does not have and is not eligible for a U.S. Social Security Number, he or she must apply for an ITIN. In a divorce year, this creates a practical timing issue: the ability to file as intended may depend on whether the spouse will cooperate in obtaining an ITIN.

Community Property Twist: Foreign Community Property Laws Can Matter (And The Election Can Switch Them Off)

International couples sometimes encounter community property concepts. IRC §879 addresses community income where one or both spouses are non-resident aliens and states that “community property laws” include those of a foreign country. It also provides that the §879 rules do not apply for any year in which a §6013(g) or (h) election is in effect. 

Even if Australian marital property isn’t “community property” in the U.S. sense, this section is a reminder that the Code sometimes explicitly contemplates foreign marital property regimes, and elections can change the default allocation framework.

Treaties And Dual Residents: When The Treaty Changes “How You Compute Tax”, But Not Necessarily Everything Else

Dual Resident Taxpayers: Treaty Tie-Breaker Can Require Form 1040-NR + Form 8833

If you are treated as a resident of a foreign country under a tax treaty, you are treated as a non-resident alien in figuring your U.S. income tax; for purposes other than figuring your tax, you will be treated as a U.S. resident. In a practical sense, it means that while you are not going to pay U.S. income tax on foreign source income, you will still need to report all non-US financial assets and file applicable international disclosure forms like 3520, 3520-A, 5471, 8865, etc.

Divorce Support And Cross-Border Cash Flows: Withholding-Agent Issues That Don’t Exist In Domestic Divorces

The cross-border “support” issue is often less about whether something is deductible (U.S. law changed in recent years for many divorces), and more about:

• recipient status (foreign or not),
• income sourcing, and
• withholding and reporting responsibilities.

Withholding Agent Concept (And Why Divorce Can Create One)

The IRS defines “withholding agent” broadly as any person required to withhold income tax on U.S.-source income received by a non-resident alien and others, and states that the withholding agent is responsible for submitting withholding information on Form 1042 and providing recipient information on Form 1042‑S. 

Many divorcing taxpayers do not realize they can become a “withholding agent” simply by agreeing to pay periodic amounts to a foreign recipient out of U.S.-source FDAP streams or other U.S.-source payments.

The non-resident alien withholding baseline and why it can matter in divorce.

Treasury regulations governing non-resident alien taxation explain that a non-resident alien not engaged in a U.S. trade or business is liable for a flat tax of 30% on certain U.S.-source amounts received during the year (subject to treaty limitation). IRS Publication 519 provides the same idea in plain language: dividends, for example, are generally taxed at 30% (or lower treaty) and are generally withheld at source; if not withheld correctly, a Form 1040‑NR may be required to claim refund or pay additional tax. 

Divorce is relevant because many settlements create:

• periodic payments,
• distributions from investment accounts,
• payments funded by dividends or interest,
• and third-party payments for the benefit of the foreign spouse.

These can create withholding and reporting tail obligations that need to be planned in advance, including documentation flow and timing.

For International Marital Gifting, There Are Two Different “Spouse” Regimes

Income tax regime governed by IRC 1041 and gift tax marital deduction under IRC 2523.

Marital deduction is disallowed for transfers to a spouse who is not a U.S. citizen at the time of the transfer. Instead, if the transfer otherwise qualifies (e.g., present interest), there is a special annual exclusion amount (inflation-adjusted). For the calendar year 2025, that amount is $190,000 ($194,000 for 2026). Citizenship drives your gift tax cap, but it does not magically convert a gift into a taxable sale or a basis step‑up.

Property Division: When “Divorce Transfers Are Tax-Free” Is False In International Divorces

The General Rule: IRC 1041 Nonrecognition For Spouse Or Incident-To-Divorce Transfers

IRC 1041(a) provides that no gain or loss is recognized on a transfer of property to a spouse or to a former spouse if the transfer is incident to divorce. Section 1041(b) provides carryover basis: the transferee generally takes the transferor’s adjusted basis.  A transfer is incident to divorce if it occurs within one year after the marriage ceases or is related to the cessation of the marriage. If our analysis stopped here, we would have a familiar US domestic non-recognition outcome.

The International Exception: IRC1041(d) When Spouse Is Non-Resident Alien

Section 1041(d) is explicit; Code section 1041(a) shall not apply if the spouse (or former spouse) receiving the transfer is a non-resident alien

This is the single most important property division issue in the U.S./foreign divorces involving a U.S. citizen spouse and a foreign spouse who remains a non-resident alien for U.S. tax purposes.

As a result, transferring appreciated property to a spouse who is a non-resident alien can be a taxable event for U.S. purposes (absent another nonrecognition provision).

Carryover basis still matters (even when  IRC 1041 does apply)

Even in cases where IRC 1041 applies (e.g., transfers between two U.S. people), the carryover basis rule means that the divorce settlement often shifts built-in gain. For portfolio-heavy couples, “equal value” does not mean “equal after-tax value.”

Transfers In Trust Where Liabilities Exceed Basis

Section 1041(e) provides that IRC 1041(a) does not apply to certain transfers in trust to the extent liabilities exceed basis.  For business-owner divorces involving trusts and leveraged assets, this provision can be relevant. Trust-based settlement structures should be reviewed not only for family-law goals but also for U.S. income tax consequences, including debt and basis mechanics.

Post-Divorce Compliance Reset: FBAR, Form 8938, And Foreign Trust Reporting

Divorce changes facts. Offshore reporting rules often attach to facts like ownership, signatory authority, beneficial interests, distributions and loans, and whether you are elected into broader residency treatment.

A useful approach is to treat post-divorce compliance as a “reset” exercise rather than a continuation of pre-divorce assumptions.

FBAR

A U.S. Treasury reporting requirement that can change with signatory authority.

Every U.S. citizen or resident alien with an interest in or signature authority over foreign financial accounts exceeding $10,000 in aggregate value at any time during the calendar year must report that relationship. The report is filed electronically on FinCEN Form 114 and is separate from the tax return; failure to file may result in civil and criminal penalties. 

Divorce relevance: even if the accounts didn’t change, divorce often changes who is a signer or owner, which can change reporting requirements in the divorce year.

Form 8938 (FATCA)

A broader “specified foreign financial assets” concept.

You may have to file Form 8938 if you are a resident alien for any part of the year, or a non-resident alien who makes an election to be treated as a resident to file a joint return (among others). 

Specified foreign financial assets include foreign financial accounts and, if held for investment, foreign stock and securities, interests in foreign entities, and financial instruments/contracts with non-U.S. issuers/counterparties. 

Penalties can apply for failure to file Form 8938 and for understatement of tax related to undisclosed assets. 

Divorce relevance: if you previously filed jointly and later file separately, or if you are considering a §6013 election in the divorce year, Form 8938 scope and thresholds can change. 

Foreign Trusts And Non-U.S. Trusts

Why do business-owner divorces require special attention?

Many U.S./Australia divorces involve family structures and entities that behave like trusts for Australian purposes or are classified as non-U.S. trusts under U.S. rules. Certain types of foreign accounts or entities are classified as non-U.S. trusts (an example could be certain superannuation accounts). If a U.S. citizen or resident is considered the beneficiary, trustee, or owner, certain information reporting forms may be required, with separate deadlines and penalties for failure to file. 

Form 3520 is filed yearly by an owner of a non-U.S. trust to report ownership, and also for certain contributions/loans to, distributions/loans from, or large gifts from non-U.S. persons/entities; generally filed by the due date (including extensions) of the individual’s return. 

Form 3520‑A is filed yearly by the trustee of a foreign trust with a U.S. owner and is generally due March 15 for a calendar-year trust; a six-month extension may be requested by March 15. 

Divorce Relevance – Divorce is often the first time a U.S. spouse sees trust deeds, trustee statements, trust distributions, or intercompany loans in one place. That is precisely the moment when a controlled “cleanup” plan should be considered if past years were inconsistent or incomplete.

A Practical Checklist Specific To U.S. Citizens Divorcing Foreign Spouses

Year-end marital status: determine what is true on December 31 for U.S. purposes. 

Spouse U.S. tax status: confirm whether the Australian spouse is a non-resident alien. 

MFJ election decision: if MFJ is desired, evaluate the §6013(g) election and its consequences (worldwide income inclusion, treaty limitations, ITIN, and termination timing). 

Divorce property transfers: identify any appreciated property being transferred to a spouse who remains a non-resident alien; §1041 nonrecognition may not apply.

Withholding/FDAP awareness: identify any U.S.-source income streams being paid to a foreign recipient and treat withholding/reporting as part of the settlement administration. 

Offshore reporting reset: rebuild the offshore asset/account/entity/trust inventory after separation and again after final orders; ensure ownership and signatories match what is reported.

International Divorce Is Manageable, But It Rewards Early, Structured Planning

If your divorce is revealing previously undisclosed foreign accounts, inconsistent prior-year offshore reporting, or trust/entity structures that were never fully integrated into U.S. filings, the most effective next step is often a structured offshore disclosure cleanup plan built around the divorce timeline—so ownership changes, trust reporting, FBAR/Form 8938 posture, and any required information returns can be corrected in a controlled, consistent way before asset division and post-divorce filing positions become fixed.