How you legally structure your business affects liability protection, how you pay taxes, how you pay yourself, and how much paperwork you file every year. Most founders pick the wrong structure by default—either skipping formal formation entirely or choosing an LLC without understanding the tax election options. This guide walks through every common structure, the financial trade-offs of each, and how to form the right one for your stage.
Business Structures at a Glance
| Structure | Liability Protection | Tax Treatment | Self-Employment Tax | Best For |
|---|---|---|---|---|
| Sole Proprietorship | None | Pass-through (Schedule C) | Full 15.3% on all profit | Testing an idea, hobby income |
| Single-Member LLC | Strong | Pass-through by default | Full 15.3% on all profit | Freelancers, side businesses |
| Multi-Member LLC | Strong | Partnership (Form 1065) | Full 15.3% on each member’s share | Co-founded businesses |
| LLC + S-Corp election | Strong | Split: salary + distributions | Only on salary portion | Profitable solo businesses ($40K+ net) |
| S-Corporation | Strong | Pass-through | Only on reasonable salary | Established, consistently profitable |
| C-Corporation | Strong | Double taxation (21% corp + personal) | Only on salary | Venture-backed, seeking investors |
| General Partnership | Weak (personal liability) | Pass-through (Form 1065) | Full | Two-person businesses, professional practices |
Sole Proprietorship: The Default You Probably Shouldn’t Keep
If you freelance, consult, or sell without forming a legal entity, you’re operating as a sole proprietor by default. There is no filing—you attach Schedule C to your personal 1040.
Why it works short-term: Zero cost, no paperwork, no separate bank account required.
Why it fails long-term:
- Your personal assets (savings, home, car) are fully exposed to business debts and lawsuits
- Clients, lenders, and platforms don’t see you as a legitimate business
- No ability to bring in partners or investors without restructuring
When to stay sole prop: Revenue under $10,000, purely testing a concept, duration under 12 months.
LLC: The Right Default for Most Small Businesses
A Limited Liability Company is the most flexible small business structure. It gives you liability separation, minimal compliance requirements, and tax flexibility. Formation costs $50–$500 depending on state (Wyoming and Delaware are popular for low fees and favorable laws).
What an LLC Does and Doesn’t Do
| Claim | Reality |
|---|---|
| Protects personal assets completely | Only if you maintain separation—no commingling funds, no signing personal guarantees for business debts |
| Reduces taxes automatically | No. Default LLC is taxed identically to sole proprietorship. Tax savings require the S-Corp election |
| Requires a lot of maintenance | Minimal: annual report (~$50–$300/year in most states), separate bank account, basic recordkeeping |
| Needs a lawyer to form | No. Most states allow online formation. A registered agent service ($50–$150/year) handles the legal address requirement |
How to Form an LLC (Step-by-Step)
- Choose your state — Form in your home state if you primarily operate there. Wyoming and Delaware only if you have a specific legal or investor reason
- Search name availability — Secretary of State website, free
- File Articles of Organization — Online portal, $50–$500 fee
- Appoint a registered agent — You can serve yourself or hire a service for $50–$150/year
- Draft an operating agreement — Not legally required in most states but critical for multi-member LLCs; documents ownership split, voting, and distributions
- Get an EIN — Free at IRS.gov, takes 5 minutes
- Open a business bank account — Required to maintain liability protection; use your EIN and Articles of Organization
- Obtain necessary licenses — Business license ($0–$100), seller’s permit (sales tax nexus states), professional license if applicable
LLC + S-Corp Election: The Tax Optimization Move
When your LLC generates $40,000+ in net profit per year, electing S-Corp taxation can reduce your self-employment tax bill significantly.
How it works: Instead of paying 15.3% SE tax on all $80,000 in net profit, you pay yourself a “reasonable salary” of $50,000 (subject to payroll taxes), then take the remaining $30,000 as a distribution—which is not subject to SE tax.
Estimated annual savings:
| Net Profit | Reasonable Salary | Distribution | SE Tax (Default LLC) | Payroll Tax (S-Corp) | Annual Savings |
|---|---|---|---|---|---|
| $40,000 | $30,000 | $10,000 | $6,120 | $4,590 | ~$1,530 |
| $80,000 | $50,000 | $30,000 | $12,240 | $7,650 | ~$4,590 |
| $120,000 | $70,000 | $50,000 | $18,360 | $10,710 | ~$7,650 |
Costs to consider: S-Corp election requires running payroll (cost: $400–$1,200/year with software like Gusto), filing Form 1120-S annually, and setting a documented “reasonable salary” that satisfies IRS scrutiny. Net of these costs, the election typically pays off around $50,000–$60,000 in annual net profit.
How to elect: File IRS Form 2553 within 75 days of LLC formation, or by March 15 for the election to take effect in the current tax year.
S-Corporation vs. C-Corporation
Most small businesses that form a corporation will choose S-Corp. C-Corp makes sense primarily when:
- You plan to raise venture capital (VCs require C-Corp, typically Delaware)
- You want to issue multiple share classes (preferred vs. common)
- You expect to reinvest all profit into the business (corporate tax rate of 21% can be lower than pass-through for high earners)
| Factor | S-Corporation | C-Corporation |
|---|---|---|
| Max shareholders | 100 | Unlimited |
| Shareholder eligibility | US citizens / residents only | Anyone, including foreign nationals and other corporations |
| Share classes | Single class only | Multiple (preferred, common) |
| Tax treatment | Pass-through | Double taxation |
| IPO / VC path | Uncommon | Standard |
| Complexity | Moderate | High |
Decision Framework: Which Structure for Your Stage
| Business Stage | Revenue | Partners | Structure to Use |
|---|---|---|---|
| Testing an idea | $0–$10K | Solo | Sole Proprietorship |
| Freelance / service business | $10K–$40K | Solo | Single-Member LLC |
| Growing service or product business | $40K–$100K | Solo | LLC + S-Corp election |
| Co-founded startup | Any | 2+ | Multi-Member LLC with operating agreement |
| Funded startup or seeking investors | Seed stage+ | Any | C-Corp (Delaware) |
| Professional practice (law, medicine) | Any | Any | PLLC or LLP depending on state requirements |
Common Formation Mistakes
Commingling funds. Paying personal expenses from the business account, or business expenses from personal, is the fastest way to “pierce the corporate veil”—meaning a court can hold you personally liable for business debts. Maintain strict separation from day one.
Skipping the operating agreement. For multi-member LLCs, the operating agreement governs what happens when a founder leaves, how decisions get made, and how profits are distributed. Without one, default state law applies—which may not reflect your intentions.
Wrong state formation. Forming in Wyoming or Delaware when you operate in California still requires you to register as a foreign LLC in California and pay California fees. You end up paying both states.
Not paying yourself a reasonable salary. For S-Corps, setting salary too low is the #1 audit trigger. The IRS requires compensation comparable to what you’d pay an employee doing the same work.
Waiting to form until you’re profitable. The liability protection of an LLC applies from formation forward—not retroactively. Form before you take on your first client, especially in service businesses where professional liability is a risk.
Annual Maintenance Checklist
After formation, maintain these requirements to preserve your liability protection:
- File annual report with Secretary of State (due date varies by state)
- Pay state LLC fee or franchise tax if applicable
- File business taxes: Schedule C (sole prop), Form 1065 (partnership), Form 1120-S (S-Corp)
- Review operating agreement if ownership or roles have changed
- Renew business license and any professional licenses
- Confirm registered agent information is current
- Review reasonable salary level if S-Corp election is in effect
- Make estimated quarterly tax payments (April 15, June 15, September 15, January 15)
Frequently Asked Questions
How much does it cost to form an LLC? State filing fees range from $50 (Kentucky, Colorado) to $500 (Massachusetts). Average is around $130. Add a registered agent service at $50–$150/year if you don’t want your personal address on public filings. Total first-year cost: typically $150–$650.
Do I need a lawyer to form an LLC? For a single-member LLC with a simple structure, no—the Secretary of State’s online portal is sufficient. For multi-member LLCs, a startup with co-founders, or any arrangement involving investors or complex ownership splits, an attorney to draft the operating agreement is worth the cost ($500–$2,000).
Can I change my structure later? Yes, with caveats. You can convert a sole proprietorship to an LLC easily. Converting an LLC to a S-Corp requires filing Form 2553. Converting from S-Corp to C-Corp is generally a taxable event. The earlier you structure correctly, the lower the future conversion friction.
What’s the difference between LLC and S-Corp taxes? An LLC is a legal structure. S-Corp is a tax election. You can have an LLC that is taxed as an S-Corp. The distinction matters because an LLC without the election pays self-employment tax on all net profit; with the election, only the salary portion is subject to payroll tax.
Do I need an EIN even if I have no employees? Yes, for multiple reasons: opening a business bank account, filing business taxes, applying for a business credit card, and hiring contractors all require an EIN. It’s free at IRS.gov and takes five minutes.
What is a registered agent, and do I need one? Every LLC is required to have a registered agent—a person or company that receives official legal and government documents on behalf of the business. You can serve as your own (your personal address becomes public record), or hire a service ($50–$150/year) to use their address.
When does it make sense to form a C-Corp instead of an LLC? Primarily when you are raising institutional venture capital, want to issue stock options via a 409A plan, or plan to go public. Delaware C-Corp is the standard for this path. For the vast majority of small businesses that self-fund or take SBA loans, an LLC is simpler and more tax-efficient.
Related: How to Start an LLC | LLC vs. S-Corp | Self-Employed Retirement Plans | Small Business Hub
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