That distinction drives self-employment tax. A default-taxed LLC may expose business earnings to the 15.3% self-employment rate. An S corporation splits owner pay into wages and distributions, which are taxed differently.
Note for Australian readers: This is a US tax comparison. Australian residency, ATO obligations, treaty rules and foreign-entity reporting can change the outcome, so read it as a starting point rather than a verdict.
Key Takeaways
- An eligible LLC can elect S corporation taxation and remain an LLC under state law.
- Default LLC taxation is simpler; S status may cut self-employment tax but demands payroll and reasonable pay.
- Distributions generally escape self-employment tax but still face ordinary income tax.
- Profit stability, eligibility, state rules, costs and cross-border facts decide the answer.
LLC vs S Corp: Quick Comparison
| Topic | LLC (default) | S corporation |
|---|---|---|
| What it is | State-law legal entity | Federal tax classification for eligible corporations and LLCs |
| Default tax | Single-member: disregarded. Multi-member: partnership | Pass-through; income reported on Form 1120-S with shareholder K-1s |
| Self-employment tax | Owner's share of earnings may be subject to it | Owner-employee takes wages with payroll tax; K-1 income is not SE income |
| Admin | Fewer formalities; state reports and fees apply | Payroll, employment filings, 1120-S, shareholder records |
| Ownership | Flexible membership | Domestic, up to 100 shareholders, one class of stock, no nonresident alien shareholders |
Default income tax treatment
A domestic single-member LLC is a disregarded entity by default. A domestic LLC with two or more members is taxed as a partnership unless it elects otherwise. It generally files Form 1065 and issues K-1s, according to the IRS.
S corporation income also passes through. Shareholders may owe tax on their share whether or not cash is distributed.
Administration and cost
Default LLCs carry less paperwork, though states add annual reports, fees or franchise taxes. California charges an $800 annual LLC tax, for example, while Delaware charges $400. These are state examples, not national averages.
An S election adds extra compliance work:
- Quarterly payroll filings (Form 941)
- Form 1120-S preparation and shareholder records
- Ongoing accounting support
Ownership and Australian relevance
LLC membership is flexible. S corporation ownership is stricter. A nonresident alien generally cannot be a shareholder. If a disregarded LLC sits in the ownership chain, its underlying owner must also qualify. For Australian residents, this is often the deciding point.
LLC and S Corp: What Are They?
What is an LLC?
A limited liability company is created by filing with a state, such as California's Secretary of State. It generally separates personal assets from business liabilities. That protection depends on keeping finances separate and following the law.
Use cases of an LLC
Default taxation suits businesses that are new, low-profit, variable in income or owner-managed. If flexibility and light administration matter more than possible payroll tax savings, keep the default tax treatment.
What is an S corporation?
S status is a federal election, made on Form 2553. Requirements include:
- A domestic entity
- No more than 100 shareholders
- Only permitted owners (individuals, certain trusts and estates)
- One class of stock
- A timely election
Use cases of an S corporation
It fits a consistently profitable US business where potential self-employment tax savings exceed added payroll, bookkeeping, filing and compliance costs.
How an LLC and S corporation work together
An eligible LLC can elect S treatment without dissolving. Form 2553 is generally due within 2 months and 15 days of the start of the intended tax year, or any time in the preceding year.
A valid S election generally means no separate Form 8832. Late election relief exists for some missed deadlines, with conditions.
States differ. New York, for example, does not automatically recognise a federal S election; an eligible company files Form CT-6. After electing, update payroll and accounting processes.
Cross-border warning: An Australian owner must first confirm they qualify as an S shareholder. They should then consider US income, withholding, the US-Australia treaty, controlled foreign company rules and ATO reporting. ATO treatment of a US LLC is fact-specific; ATO decisions have treated some US LLCs as foreign hybrids, but that is not a universal rule.
LLC vs S Corp: Which Can Reduce Self-Employment Tax?
The default LLC model
Profit passes to the owner, and eligible net earnings are subject to self-employment tax. For 2026 that is 15.3% (12.4% Social Security, 2.9% Medicare), per the IRS self-employment guidance.
The calculation generally uses 92.35% of net earnings. The Social Security portion applies up to a $184,500 base in 2026, and an Additional Medicare Tax of 0.9% applies above income thresholds.
The S corporation model
Illustration only, using round numbers: an owner's business earns $100,000 before owner pay. The owner takes reasonable W-2 wages, say $60,000, which carry payroll taxes.
The remaining profit may be distributed, and K-1 income is not self-employment income. Income tax still applies to all of it. The $60,000 is not a recommended ratio; it simply shows the mechanics.
Reasonable compensation
Shareholder-employees must be paid reasonable compensation before taking non-wage distributions. The IRS can reclassify distributions as wages. Its compensation guidance lists factors such as:
- Training and experience
- Duties and responsibilities
- Time and effort devoted
- Comparable pay in the industry
- Pay to non-shareholder employees
- Dividend history and written agreements
No fixed salary ratio is safe. Watson v. United States (8th Cir. 2012) shows the risk: an S corporation paid its owner $24,000 a year while the government's expert valued his services at $91,044. The court upheld the wage recharacterisation. It is an old enforcement case, not a benchmark.
Weighing savings against costs
Subtract the extra costs from the gross saving:
- Employer and employee payroll taxes on wages
- Payroll processing and quarterly filings
- Form 1120-S preparation and bookkeeping
- State taxes or franchise fees
- Professional advice
No universal threshold
No income level makes an S election automatically worthwhile. Run a break-even calculation using realistic salary, expected profit, state and personal circumstances. Section 199A is a further trade-off: reasonable compensation is excluded from qualified business income, which can reduce that deduction.
Limitations
- Distributions don't eliminate ordinary income tax.
- Underpaying salary invites IRS exposure.
- Losses and benefits may be treated differently.
- The election may not suit nonresident shareholders or changing ownership plans.
Real-World Examples and Decision Scenarios
Hypothetical: US LLC, default vs S election
This is a hypothetical, not a guaranteed outcome. Consider a US LLC with a single owner and steady profit.
| Default LLC | LLC taxed as S corp | |
|---|---|---|
| Profit before owner pay | $120,000 | $120,000 |
| Owner W-2 salary | None | $70,000 (assumed reasonable) |
| Distributions | Not applicable | Remainder after costs |
| Self-employment tax base | Most profit | None on distributions; payroll tax on wages |
| Added administration | Minimal | Payroll, 941s, 1120-S, bookkeeping |
Savings equal the self-employment tax avoided on distributions, minus payroll and compliance costs. If profit dips or reasonable pay is high, the benefit can shrink to nothing.
Decision scenario: Australian founder with US activity
Suppose an Australian resident runs a US LLC. Before choosing S taxation, review:
- Whether they can legally be an S shareholder, given the nonresident alien restriction
- US tax residency status
- ATO treatment (foreign hybrid or other) and worldwide income reporting
- Treaty analysis, including business profits and dividend withholding (5% or 15% in common cases under the 2001 Protocol)
- Foreign reporting: foreign-owned single-member LLCs with reportable transactions generally file Form 5472 ($25,000 failure-to-file penalty)
- CFC attribution, which isn't automatic just because an Australian owns a US LLC
Practical cues
- Choose default LLC taxation when simplicity, flexibility or uncertain profit is the priority.
- Investigate S treatment when profit is stable, the owner can support reasonable payroll, and projected savings exceed compliance costs.
Getting a coordinated review
VJM Global's team of U.S.-trained CPAs and Indian Chartered Accountants handles US entity formation, tax, payroll and compliance. The firm has served 250+ Australian businesses.
Australian businesses with US operations can request a coordinated accounting and tax-compliance review before making an election. Neither structure is right for everyone; the review tests which one fits your numbers.
Conclusion
An LLC gives legal flexibility and a simple default structure. S corp taxation may reduce self-employment tax for an eligible, consistently profitable business that runs payroll and pays reasonable compensation.
Australian readers shouldn't decide from a US-only calculation. Compare federal and state obligations with Australian tax and reporting consequences, then get advice based on the owner, entity, income source and long-term plans.
Frequently Asked Questions
Which is best, LLC or S corp?
They aren't direct rivals: an LLC is a legal entity, an S corporation is a tax status. Default LLC taxation suits simpler businesses or those with uncertain profits; S corporation treatment suits stable, profitable ones.
What is the best tax option for an LLC?
It depends on ownership, profit consistency, payroll costs, state rules and cross-border tax rules. There is no single universal choice.
What is the main tax advantage of an S-corporation?
Owner-employees separate salary from distributions, potentially limiting self-employment and payroll tax on the distribution portion. Ordinary income tax still applies.
Can an Australian resident own a US LLC or S corporation?
LLC ownership is generally flexible, but S corporation shareholders cannot be nonresident aliens. Confirm current IRS, tax treaty and ATO implications first.
Does an LLC need to become an S corporation to reduce self-employment tax?
No. The election is optional, and any benefit must be weighed against reasonable-compensation rules and added compliance costs.
What extra costs come with S corporation taxation?
Expect payroll, quarterly employment filings, Form 1120-S, bookkeeping, state requirements, shareholder records and professional tax support.
