U.S. Business Structures Compared: LLC vs. C Corp vs. Partnership

U.S. Company Formation · 8 min read

One founder, two partners, or a startup with investors? The same business idea can lead to different paperwork. Start with who owns it, how you’ll fund it, and where you’ll work.

2. U.S. LLC vs. C Corp: Which fits your business?

A U.S. LLC is a state-law entity with flexible federal tax treatment. A single-member LLC is generally disregarded for income tax by default, while a multi-member LLC generally files as a partnership unless it elects corporate treatment. A C corporation generally files Form 1120 and pays tax on its taxable profits. Dividends can trigger separate withholding for foreign shareholders. An LLC election to be taxed as a corporation changes its tax classification. Forming or converting to a corporation is a separate legal step.

If you’re building a bootstrapped agency, compare owner-level tax and recurring filings. If you’re building a SaaS startup and expect to issue preferred shares or employee equity, ask investors what entity they require before forming. See the IRS guide to LLC tax classification.

3. LLC vs. general partnership: What changes for two founders?

A multi-member LLC generally provides a liability shield under state law, subject to exceptions. General partners can be personally liable for business obligations. Both can have the same federal partnership treatment: Form 1065 and Schedule K-1 for each partner. If the partnership has effectively connected taxable income allocated to foreign partners, withholding can apply even when the partners take no cash out. Put ownership, voting, and exit terms in writing. See IRS partnership withholding guidance.

4. Single-member LLC vs. sole proprietorship

A sole proprietor operates personally, without a separate state-law entity. A single-member LLC generally gives the owner a separate legal entity and limited liability, even when the IRS disregards the LLC for income tax. That distinction matters when a solo freelancer starts signing larger contracts. A foreign-owned U.S. LLC can also have its own information-filing requirement.

5. Questions Pakistani founders ask before setting up a U.S. business

Do I owe U.S. tax if I do all my client work from Pakistan?

For personal services, income sourcing generally follows where the work is performed. A U.S. client or U.S. payment account alone does not determine the result. Entity tax classification, U.S. business activities, and the kind of income can change your obligations. Selling goods or licensing software can involve different sourcing rules. Review Pakistan tax and reporting separately. See the IRS rules for sourcing personal services income.

Does a foreign-owned LLC file if it has no sales?

A foreign-owned U.S. single-member LLC under the default tax classification generally files Form 5472 with a pro forma Form 1120 when it has reportable related-party transactions. Owner funding or distributions can count even before the first sale. Check the company’s state deadlines separately. See the Form 5472 instructions.

Do I need an LLC or a C Corp for Amazon, Shopify, or Stripe?

Check the marketplace, payment processor, and payout provider for the entity types and beneficial-owner locations they support. A U.S. company and EIN do not guarantee approval. If you hold inventory in the U.S., review federal and state obligations before choosing an entity. Marketplace sales tax collection and your own filing obligations are separate questions.

Does a Pakistani owner need an EIN or ITIN?

The EIN identifies the business. The ITIN is a personal federal tax ID for eligible individuals. Owning an LLC does not automatically create a personal ITIN requirement. See our ITIN guide for founders in Pakistan.

Can a nonresident alien shareholder choose an S Corp?

No. S corporations cannot have nonresident alien shareholders. Check U.S. tax residency and ownership eligibility before considering an S election. See IRS S corporation eligibility.

6. Sole proprietorship

A sole proprietorship is an unincorporated business owned by one individual. There is no separate legal entity to shield your personal assets from business debts. A business name or DBA does not change that.

Federal taxes: U.S. citizens and tax residents generally report business profit on their personal return, and self-employment tax may also apply. A nonresident who carries on a U.S. trade or business generally files a U.S. nonresident return and pays tax on net income connected to that business, subject to any applicable treaty. Where you perform the work matters: having U.S. customers alone does not mean your services are performed in the U.S.

7. Partnership

Two or more owners can operate as a partnership. In a general partnership, partners can be personally liable for business obligations. Limited partnerships and LLPs have different rules, which vary by state. A written agreement should address ownership, decision-making and what happens if someone leaves.

Federal taxes: A domestic partnership generally files an information return and gives each partner a Schedule K-1, a statement showing their share of the business’s income or loss. Partners generally report their shares on their own returns even if no cash is distributed.

For foreign partners: If the partnership earns taxable income connected to a U.S. trade or business, it generally must pay withholding tax to the IRS on the foreign partners’ shares, even if it pays them no cash. A nonresident individual partner generally files a U.S. nonresident return to calculate their final tax. The partnership provides a separate withholding statement so the partner can claim the amount paid on their behalf as a credit. If the credit exceeds the final tax due, the partner may claim a refund; if it falls short, they pay the difference. See IRS guidance on partnership withholding.

8. Limited liability company (LLC)

An LLC is formed under state law and generally separates business obligations from its members’ personal assets. That protection has limits, including debts an owner personally guarantees.

Federal taxes: By default, a domestic single-member LLC is generally disregarded as separate from its owner for federal income tax, and a domestic LLC with multiple members is generally treated as a partnership. An LLC can elect corporate tax treatment. Employment and certain excise tax rules can treat a disregarded LLC separately.

For foreign owners: A nonresident individual who owns a single-member LLC under the default tax treatment generally reports any income connected to a U.S. trade or business on their own U.S. nonresident return. Separately, the LLC can have an information filing even when no U.S. income tax is due. Money the owner puts into or takes out of the LLC can trigger that reporting. A multi-member LLC taxed as a partnership generally follows the partnership reporting and foreign-partner withholding rules above. See the IRS Form 5472 instructions.

9. C corporation

A C corporation is a separate legal entity owned by shareholders. Its share structure can suit businesses planning to raise outside investment or issue equity to employees. It typically involves more formal governance and recordkeeping.

Federal taxes: A domestic C corporation generally files its own U.S. return and pays federal tax on its taxable profits. When it pays dividends to a nonresident shareholder, it generally withholds U.S. tax at 30%, unless a lower treaty rate or other exception applies. A nonresident shareholder generally does not need a U.S. personal return solely for dividends if the correct U.S. tax was withheld and no other filing obligation applies. An S corporation is a separate federal tax election for eligible businesses; nonresident alien shareholders are not eligible.

10. How to choose

• Ownership: Start with the number of owners and their tax residency.
• Liability: Consider contracts, business debts and any personal guarantees you may sign.
• Funding: Decide whether you plan to raise equity or run the business with a small group of owners.
• Ongoing costs: Compare federal filings, state fees and annual reports, and home-country reporting before you form.

You can often change structure or tax classification later, but first check whether the change triggers tax, requires new registrations, or affects existing contracts.

Note; This guide covers general U.S. federal tax principles. State and foreign rules vary, and your obligations depend on your facts.