Written by Cindy Gui, Senior Tax Manager in Sydney Australia
When an Australian business reaches out about their US tax obligations, the conversation usually starts this way: "We've already set up our US entity. Can you help us with compliance?"
My next question is always: "What type of entity did you form, and who owns it?"
The answers often reveal structural problems that will create ongoing US tax complications. By the time businesses reach out for US tax advice, they're already locked into a structure with compliance costs and complications they didn't expect.
Here's what I've noticed: The formation decision often happens quickly—sometimes out of urgency to "get started" in the US market, sometimes based on general advice that "LLCs are flexible" or "Delaware is standard." The formation itself might cost $500 and take minutes. The tax consequences play out over years.
It’s important to know that this isn't about assigning blame. Cross-border entity selection is genuinely complex. The challenge is that what seems like a simple formation decision creates tax consequences in both US federal tax and across multiple US states—consequences that most businesses don't fully understand until they're already committed.
Formation Before Strategy
What I see repeatedly: Australian businesses form a US entity to "establish a presence" without first mapping out what that entity needs to accomplish and how it should be structured.
Is this for entering the US market? Hiring US employees? Accessing US payment platforms? Holding US assets? Or simply collecting sales through online channels?
Each of these scenarios has different US tax implications. And the ownership structure—who owns the entity and how—matters just as much as the entity type itself.
The questions that should be answered before formation:
Who will own this entity? This is about corporate structure and whether individual owners will be pulled into the US tax system personally.
Where will activities occur? Your operational footprint drives US state tax obligations across multiple jurisdictions.
What's the timeline? Even dormant US entities have filing requirements and costs that accumulate over time.
What Happens After Formation
Let me walk through what I see most commonly when the structure doesn't match the business reality.
The Active LLC Scenario:
An Australian company wants to establish US operations. Someone recommends forming a US LLC for flexibility. Sometimes it's a single-member LLC owned by the Australian company. Sometimes Australian individuals form the LLC directly.
Here's the first issue: A single-member LLC owned by a foreign entity or foreign individuals is a disregarded entity for US tax purposes. The LLC itself doesn't file a US tax return. Instead, the foreign owner is treated as directly conducting the US business activities.
For individual Australian owners, this creates potential US tax exposure. Depending on the nature and extent of the LLC's US activities, those individuals may be required to file Form 1040-NR (US nonresident tax return) for effectively connected income. Whether treaty protections apply depends on the specific facts and circumstances—but the point is that individual ownership of a disregarded LLC creates complexity and potential personal tax exposure that needs to be analyzed before formation, not discovered after.
The Dormant Corporation Scenario:
On the opposite end, I see Australian businesses who form C-Corporations and assume they can leave them dormant without filing obligations if there's no activity.
An Australian company forms a US C-Corporation to "reserve the structure" or "test the market." The corporation has no operations yet—no income, no expenses, no activity. They assume no activity means no filing requirements.
But here's the reality of what happens: The Australian parent company pays the US corporation's compliance costs—registered agent fees, annual state fees, perhaps some accounting or legal bills. These are small amounts and the US entity is still "dormant" in the sense that it has no business operations.
However, those payments from the Australian parent to the US corporation are reportable transactions. The US C-Corporation must file Form 1120 annually (regardless of activity level), and it must also file Form 5472 to report these related-party transactions with its foreign parent.
Many businesses don't realize this. They think "no activity means no filing" and don't file Form 1120 at all. Or they file Form 1120 showing zero business income but miss the Form 5472 requirement entirely because they don't realize that paying compliance costs creates a reporting obligation. But the real exposure is Form 5472—the penalty for not timely and accurately filing Form 5472 is US$25,000 per form, per year.
The simpler approach: Don't form the entity until you're ready to use it. Formation takes days, not months. You can move quickly when ready and avoid years of dormant compliance costs—and more importantly, avoid the reporting traps that come with even minimal related-party transactions.
Why This Keeps Happening
The fundamental issue: US entity formation generally is easy and quick. Understanding the US tax implications is complex and requires specialized knowledge.
You can form a Delaware or Wyoming LLC online in 20 minutes for a nominal charge. But understanding the tax implications behind it —that analysis takes time, expertise, and knowledge of US federal tax, US state tax, and how these interact with your specific ownership and operational structure.
The formation decision feels tactical. The consequences are strategic.
The Bottom Line
Here's what I've learned over years of helping Australian businesses navigate this:
The questions you need to answer before formation are more complex than they appear. Who should own this entity to avoid pulling individuals into the US tax system? Where will activities actually occur, and what multi-state obligations does that create? Do we even need this entity now, or are we forming it prematurely?
These questions don't have generic answers. They require analysis of your specific ownership structure, planned activities, timeline, and objectives. Take the time to understand the US tax implications before formation. Your future self will thank you.
