Many business owners, particularly those with international interests, hear about the "tax advantages" of a US S corporation. The main selling point is often the avoidance of "double taxation." But what does that actually mean, and is it always true?
The short answer is: no, an S corporation generally avoids the classic form of US federal double taxation. Unlike a traditional C corporation, its profits usually pass through to its shareholders to be taxed on their personal returns. However, this simple answer hides significant complexities involving payroll taxes, state-level taxes, and crucial cross-border implications for Australian residents and businesses.
This article breaks down how S corporations are taxed, when additional taxes can still apply, and what Australian owners must consider before assuming the US tax treatment will be mirrored back home.
This article provides general information and does not constitute personalised US or Australian tax advice. You should consult with qualified professionals for guidance on your specific situation.
Key Takeaways
- S corp profits, losses, and credits pass through to shareholders on their personal US tax returns.
- Pass-through income differs from wages; shareholder-employees must take reasonable compensation subject to payroll taxes.
- Entity-level tax can still arise from state nonconformity, payroll obligations, or built-in gains rules.
- Australian residents need a separate Australian-law analysis; US pass-through treatment may not apply.
What Does Double Taxation Mean for a Corporation?
To understand the S corp advantage, you first need to understand the default structure it avoids: the C corporation. "Double taxation" is the common term for the two layers of tax a C corporation and its shareholders can face on the same income.
Here’s how it works:
- Corporate-Level Tax: The C corporation earns a profit and pays US corporate income tax on those earnings.
- Shareholder-Level Tax: If the company then distributes its after-tax profits to shareholders as dividends, those shareholders must report the dividends as income and pay personal income tax on them.
The same pool of corporate profit gets taxed twice: once inside the company and again when it reaches the owner. This is different from other taxes a business pays, such as payroll tax on employee wages or state franchise taxes. Double taxation specifically refers to this multi-layered tax on corporate profits.
The Australian Perspective
For an Australian tax resident owning shares in a US company, the situation has an extra layer of complexity. You must consider how Australian tax law treats the foreign company's income and any distributions you receive.
Even if the US classifies an entity one way, the Australian Taxation Office (ATO) may treat it as a standard company, making distributions taxable as dividends. Analyse the structure under both US and Australian rules.
How Is an S Corporation Taxed?
An S corporation sidesteps the C corporation's two-tax structure through a "pass-through" system. The S corporation itself generally does not pay federal income tax. Instead, the financial results "pass through" to the shareholders.
The S corporation files an informational tax return with the IRS on Form 1120-S. This form reports the company's total income, deductions, profits, and losses. The corporation then provides each shareholder with a Schedule K-1, which details their individual share of those financial items.
Shareholders report these allocated amounts on their personal US tax returns and pay tax at their individual income tax rates. This happens whether or not the company actually distributes the cash to them. If your S corp earns a profit but retains the cash for business growth, you are still responsible for the tax on your share of that profit.
Salary vs. Distributions
A common point of confusion is the difference between shareholder salary and distributions. Getting this wrong can trigger IRS reclassification and penalties.
- Reasonable Compensation: Shareholder-employees must take a reasonable salary for work performed. That pay is subject to US payroll taxes such as Social Security and Medicare.
- Distributions: These are payments of profit to shareholders, separate from wages. They are not subject to payroll taxes, but they must be proportional to ownership shares.
You cannot avoid payroll taxes by classifying all payments as distributions. The IRS can reclassify distributions as wages if it determines your compensation is unreasonably low, resulting in back taxes and penalties.
The Role of Shareholder Basis
Whether a distribution is taxable to you depends on your "basis" in the corporation's stock. Your stock basis starts with your initial investment and is adjusted each year. It increases with your share of corporate income and decreases with your share of losses and any distributions you receive.
Generally, distributions are tax-free in the US as long as they do not exceed your stock basis. Distributions in excess of your basis are typically taxed as capital gains. Track basis each year so distributions are reported correctly.
When Can an S Corporation Still Face Additional or Double Taxation?
While an S corporation avoids the federal C corp double tax, it is not tax-exempt. Several situations can trigger entity-level taxes or create a form of double taxation, especially in a cross-border context.
State and Local Taxes
The "S" election is a federal tax status. Individual states are not required to follow it.
- State nonconformity: Some states and cities do not recognise the S election or levy their own entity-level taxes. California's FTB, for example, charges a 1.5% tax on net income (minimum franchise tax $800 in most years).
- City and franchise taxes: New York City ignores the S election and taxes S corps as C corps. Tennessee and similar states apply franchise and excise taxes regardless of federal status.
Federal Entity-Level Taxes
In specific circumstances, an S corporation can owe federal tax directly.
- Built-in gains (BIG) tax: After a C-to-S conversion, selling assets that appreciated in the C corp years can trigger tax on that gain if the sale falls inside the five-year recognition period.
- Excess net passive income tax: May apply when an S corp still holds C corp earnings and earns substantial passive income such as interest or rent.
Australian Tax Obligations
For an Australian resident shareholder, the most significant risk of double taxation comes from the mismatch between US and Australian tax law.
Australia’s Controlled Foreign Company (CFC) rules stop residents deferring tax on income earned through overseas entities. If five or fewer Australian residents control a foreign company, passive or "tainted" income can be attributed to those shareholders and taxed in Australia even before distribution.
An attributable taxpayer generally holds an interest of 10% or more.
Even if CFC rules don't apply, the ATO may simply classify the US S corp as a foreign company. In that case, any distributions you receive would likely be treated as foreign-source dividends, taxable in Australia. While a Foreign Income Tax Offset (FITO) may be available for US taxes paid, the rules are complex and relief is not guaranteed.
S Corporation vs. C Corporation: Which One Avoids Double Taxation?
The choice between an S corp and a C corp depends entirely on your business goals, ownership structure, and profit distribution strategy.
| Feature | S Corporation | C Corporation |
|---|---|---|
| US federal double tax | Generally avoided; profits pass through to shareholders. | Subject to double taxation (corporate tax + dividend tax). |
| Ownership | Restricted to no more than 100 shareholders. Owners must be US citizens, resident aliens, or specific types of trusts/estates. | No restrictions on number or type of owners. Foreign individuals and companies can own shares. |
| Stock | Only one class of stock is permitted (though differences in voting rights are allowed). | Can issue multiple classes of stock (such as common and preferred), which is useful for raising capital. |
An S corporation is often ideal for closely held businesses where profits will be distributed to owners regularly. A C corporation is usually the better choice for companies planning to:
- Seek investment from venture capital or foreign investors
- Offer different classes of stock to attract investors
- Reinvest a significant portion of profits back into the business
An LLC (Limited Liability Company) is another flexible option that offers pass-through taxation by default but can also elect to be taxed as an S corp or C corp.
S Corporation Eligibility, Filing, and Compliance Checklist
Making an S corp election requires meeting strict IRS criteria and maintaining ongoing compliance.
Key Eligibility Requirements
To qualify for S corporation status, a business must:
- Be a domestic US corporation (or an eligible domestic entity like an LLC)
- Have 100 or fewer shareholders
- Have only eligible shareholders (individuals, certain trusts, and estates); non-resident aliens and other corporations cannot be direct shareholders
- Have only one class of stock
- Not be an ineligible corporation type (such as certain financial institutions or insurance companies)
Make the election by filing Form 2553 with the IRS, signed by all shareholders.
Ongoing Compliance Tasks
- File the corporate information return (Form 1120-S) each year and issue Schedule K-1s to all shareholders
- Run payroll and issue W-2s for shareholder-employees, paying and reporting required employment taxes
- Keep accurate records of shareholder basis, accounting books, and all distributions
- Meet registration, annual report, and tax filing rules in every US state where the company operates
- Review and manage Australian tax and reporting obligations for any Australian owners
Failure to meet these requirements can lead to penalties or even involuntary termination of the S corp status, which could force the company back into the C corp double-taxation system.
How Should an Australian Business or Resident Evaluate a US S Corporation?
If you are an Australian resident or business owner with a stake in a US S corporation, you cannot assume the US tax treatment applies in Australia. A separate, coordinated analysis is essential to avoid unexpected tax bills and penalties.
Before making any decisions, you should gather key information, including:
- The US entity’s formation documents and S corp election (Form 2553)
- Annual US corporate tax returns (Form 1120-S) and your Schedule K-1s
- Detailed records of your stock basis, capital contributions, and all distributions received
- Records of all US federal, state, and payroll taxes paid
- Your Australian tax residency status
The interaction between US pass-through rules, state taxes, and Australian foreign income rules is complex. A mistake in one jurisdiction can create significant problems in the other.
Navigating this needs a coordinated approach across both countries. At VJM Global, we support businesses and investors with cross-border accounting, tax compliance, and financial reporting for multinational operations.
Our team helps clients in the US, Australia, and beyond keep financial records clear and compliant, giving licensed tax and legal professionals in each jurisdiction a solid basis for advice.
Frequently Asked Questions
What corporation can avoid double taxation?
An eligible US S corporation generally avoids federal corporate double taxation because profits and losses pass through to be taxed on shareholders' personal returns. However, state taxes, payroll taxes, and foreign tax rules can still apply.
Do companies get double taxed?
C corporations can be double-taxed: once on corporate profits and again on shareholder dividends. S corporations are structured to avoid this at the US federal level by passing income directly to shareholders.
What happens if I am double taxed?
First, identify the source of the tax: is it federal vs. state, income vs. payroll, or a US vs. Australian tax issue? Review your tax returns and basis records, and seek advice from qualified tax professionals before taking corrective action.
Is S corp income taxed if it is not distributed?
Yes. S corporation shareholders are taxed on their allocated share of the company's income for the year, regardless of whether they receive that income as a cash distribution. This makes it important to plan for tax payments.
Are S corp distributions taxed twice?
Properly reported distributions from an S corporation are generally not taxed a second time at the US federal level, provided they are supported by sufficient stock basis. However, state tax rules or Australian tax law may treat these distributions differently.
