Types of Companies Explained: Choosing the Right Business Structure
A business structure (also called a business entity or legal form) defines how your company is organized in the eyes of the law. It determines three critical things: how much personal liability you carry, how you are taxed, and whether you can raise investment capital. Choosing the wrong structure can cost you thousands in unnecessary taxes, block you from raising funding, or leave your personal assets exposed to business debts.
Key Concept: Your business structure is not permanent — you can convert later — but each conversion has costs, tax implications, and administrative burden. Get it right the first time when possible.
Sole Proprietorship
A sole proprietorship is the simplest and most common business form. If you start selling services or products without filing any paperwork, you are automatically a sole proprietor. There is no legal separation between you and the business.
- Liability: None. You are personally liable for all business debts and legal claims. If the business is sued, your personal savings, home, and car are at risk.
- Taxation: Business income flows directly onto your personal tax return (Schedule C). You pay self-employment tax (15.3%) on all profits in addition to income tax.
- Fundraising: Cannot sell equity. Investors will not invest in a sole proprietorship.
- Best for: Very early-stage solo projects, freelancers testing an idea, side hustles with minimal liability risk.
Most entrepreneurs should move beyond a sole proprietorship as soon as they have customers, revenue, or a co-founder.
Partnership
A partnership exists when two or more people carry on a business together for profit. There are two main types:
General Partnership (GP)
All partners share equal management responsibility and unlimited personal liability. Like a sole proprietorship but with multiple people. Rarely advisable because each partner is liable for the actions of every other partner.
Limited Partnership (LP)
Has at least one general partner (unlimited liability, manages the business) and one or more limited partners (liability limited to their investment, no management role). Common in real estate and venture capital fund structures, but rarely used for operating startups.
Limited Liability Company (LLC)
The LLC is the most popular structure for small businesses in the US. It provides liability protection (your personal assets are separated from business debts) while offering flexible taxation and minimal formalities.
- Liability: Limited. Members'' personal assets are protected from business debts and lawsuits, as long as you maintain proper separation (no commingling funds, proper records).
- Taxation: Flexible. By default, a single-member LLC is taxed as a sole proprietorship and a multi-member LLC is taxed as a partnership. You can also elect to be taxed as an S-Corp or C-Corp.
- Formalities: Minimal. No required annual meetings, no board of directors. You should have an operating agreement but it is not legally required in all states.
- Fundraising: Difficult. Most VCs cannot or will not invest in LLCs due to their fund structure. You would need to convert to a C-Corp before raising institutional capital.
- Best for: Bootstrapped businesses, consulting firms, real estate holdings, businesses that do not plan to raise VC funding.
S-Corporation
An S-Corp is not a separate entity type — it is a tax election available to LLCs and corporations. It allows business income to pass through to owners'' personal tax returns while providing a tax advantage: owners pay themselves a "reasonable salary" (subject to payroll tax) and take remaining profits as distributions (not subject to self-employment tax).
- Tax benefit: If your LLC earns $200K in profit, you might pay yourself a $100K salary (payroll tax applies) and take $100K as a distribution (no self-employment tax). This can save $10,000–$15,000/year in payroll taxes.
- Limitations: Maximum 100 shareholders, only US residents, one class of stock only. These restrictions make S-Corps incompatible with venture capital.
- Best for: Profitable small businesses (typically $75K+ annual profit) that want to reduce self-employment taxes without the complexity of a C-Corp.
C-Corporation
The C-Corp is the standard structure for venture-backed startups and large companies. Every publicly traded company is a C-Corp. It provides the strongest liability protection and the most flexibility for issuing stock.
- Liability: Strong. Shareholders'' liability is limited to their investment.
- Taxation: Double taxation — the corporation pays corporate tax on profits (21% federal), and shareholders pay personal tax on dividends. However, startups rarely pay dividends, and tax strategies like QSBS (Qualified Small Business Stock) can eliminate up to $10M in capital gains taxes for founders.
- Fundraising: Ideal. C-Corps can issue multiple classes of stock (common for founders, preferred for investors), grant stock options to employees, and are compatible with every type of investor.
- Formalities: Most complex. Requires a board of directors, annual shareholder meetings, corporate minutes, stock ledger maintenance, and annual state filings.
- Best for: Any startup planning to raise venture capital, issue stock options, or eventually go public or be acquired.
For guidance on setting up any of these structures, see our step-by-step guide on how to legally start a business.
LTD (UK and International)
A Private Limited Company (LTD) is the UK equivalent of a US LLC or close corporation. It is the standard structure for businesses in the UK, Ireland, and many Commonwealth countries.
- Liability: Limited to the value of shares held by each shareholder.
- Taxation: Corporation tax on profits (currently 19–25% in the UK depending on profit levels). Dividends taxed at lower rates than salary.
- Setup: Register with Companies House (online, £12 filing fee). Faster and cheaper than US incorporation.
- Fundraising: Can issue shares to investors. UK venture capital firms invest in LTDs. If you plan to raise from US VCs, you may need to create a US parent company (a C-Corp) and make the LTD a subsidiary — this is called a "flip."
Side-by-Side Comparison
| Feature | Sole Prop. | LLC | S-Corp | C-Corp | LTD (UK) |
|---|---|---|---|---|---|
| Liability Protection | None | Yes | Yes | Yes | Yes |
| Pass-through Tax | Yes | Yes | Yes | No | No |
| VC Compatible | No | No | No | Yes | Partial |
| Stock Options | No | No | Limited | Yes | Yes (EMI) |
| Complexity | Minimal | Low | Medium | High | Medium |
| Formation Cost (US/UK) | $0 | $50–$500 | $50–$500 | $89–$500 | £12 |
| Ongoing Compliance | None | Low | Medium | High | Medium |
How to Choose the Right Structure
- Will you raise venture capital? → Delaware C-Corp. No exceptions.
- Are you bootstrapping with a co-founder? → LLC (convert later if needed).
- Are you a solo consultant or freelancer? → LLC for liability protection. Add S-Corp election when profits exceed $75K.
- Are you based in the UK? → LTD. Consider a US C-Corp parent if targeting US VCs.
- Are you testing an idea on the side? → Sole proprietorship is fine temporarily. Convert to LLC before you have customers or revenue.
Once you have the right structure in place, you will also want to understand the contracts and financial tracking that keep your business running smoothly.
When to Change Your Structure
Common structure transitions:
- Sole proprietorship → LLC: When you have customers, revenue, or any liability risk. Simple process.
- LLC → C-Corp: When you decide to raise venture capital. Costs $2,000–$10,000 in legal fees and may trigger a tax event.
- LLC → S-Corp (tax election): When annual profits exceed $75K and you want to save on self-employment taxes. Relatively painless — just file Form 2553.
- LTD → US C-Corp: When raising from US VCs. Usually structured as creating a new Delaware C-Corp that acquires the LTD as a subsidiary.
Key Takeaways
- Venture-backed startups should be Delaware C-Corps — this is non-negotiable for institutional investors
- LLCs are ideal for bootstrapped businesses: strong liability protection, flexible taxation, minimal formality
- S-Corp election saves self-employment taxes for profitable businesses but is incompatible with VC fundraising
- UK founders should start with an LTD and consider a US C-Corp parent if targeting US investors
- Never operate with personal liability exposure — at minimum, form an LLC
Frequently Asked Questions
Can a single person form an LLC or corporation?
Yes. Single-member LLCs and single-shareholder corporations are common and legal in all US states. A single-member LLC is taxed as a sole proprietorship by default (with liability protection). A single-shareholder C-Corp is taxed as a corporation. Both structures work fine for solo founders.
What is "double taxation" and is it really a problem?
Double taxation means the corporation pays corporate tax on profits, and then shareholders pay personal income tax on dividends. In practice, this is rarely a problem for startups because: (1) startups usually reinvest all profits and do not pay dividends, (2) founder compensation is a deductible business expense, and (3) QSBS provisions can eliminate capital gains taxes when you sell. Double taxation is mainly a concern for profitable companies distributing cash to owners.
Is an LLC or S-Corp better for a small business?
If your annual profit is below $60K–$75K, a standard LLC is simpler and the S-Corp tax savings are minimal. Above $75K in profit, the S-Corp election can save $5,000–$15,000/year in self-employment taxes. The S-Corp adds complexity (payroll requirements, reasonable compensation rules), so the savings must justify the added cost of payroll processing and compliance.
Do I need to register in every state where I have customers?
Not necessarily for simply having customers, but you may need to register as a "foreign" entity in states where you have a physical presence (office, employee, inventory). You may also have sales tax obligations (nexus) in states where you have significant economic activity. The rules vary by state, and the Supreme Court''s South Dakota v. Wayfair decision expanded states'' ability to require sales tax collection from remote sellers.