LLC, C-Corp or S-Corp: choosing a US structure for your business
Compare ownership, investment and tax classification before you form a company. Understand what an LLC offers and when to consider a corporation.
LLC and corporation describe legal structures; C-Corp and S-Corp describe federal tax treatment. Choosing a US company means making those decisions separately. An LLC can have one owner or several and can be treated as a disregarded entity, a partnership or a corporation, depending on its classification.
That flexibility is a practical advantage for international founders. You can organise ownership, contracts, accounts and decision-making without immediately adopting a share structure designed for outside investors. The useful question is not which abbreviation sounds more impressive. It is what your business needs the company to do over the next few years.
Legal structure and tax classification are different choices
State law governs the entity's formation and internal organisation. Federal classification determines how its income is treated. The IRS explains the classifications available to an LLC.
| Structure and treatment | Ownership | Federal starting point |
|---|---|---|
| Single-member LLC without a corporate election | One owner | Disregarded for income tax |
| Domestic multi-member LLC without a corporate election | Two or more members | Partnership by default |
| Corporation or LLC taxed as a C-Corp | Shareholders or members, according to legal form | Corporate income tax |
| Eligible entity electing S-Corp status | Eligible shareholders | Income generally passes through under specific rules |
These are not four equivalent legal entities. An LLC electing corporate taxation remains an LLC under state law. Likewise, a corporation does not become an LLC because its shareholders prefer pass-through treatment.
Why an LLC works for many international businesses
An LLC provides a legal entity through which to contract, hold assets and organise business activity. Its operating agreement can define who makes decisions, who signs and how members work together. Limited liability provides legal separation; clear contracts, separate accounts and appropriate management help maintain that separation.
For an agency, consultancy or online business, these arrangements may matter more than a complex share structure. Customers know their contractual counterparty, providers know whom they serve and each account has a defined purpose: collections, payments or reserves. An LLC can also hold investments or ownership interests, with the relevant asset-specific review.
Foreign-owned describes ownership, not an extra tax classification. A foreign-owned LLC can have one or several members. Before choosing returns or calculating tax, identify the owners, their residence, the actual activity and any elections already made.
One member and several members need different planning
A single-member LLC is generally disregarded for federal income tax unless it elects corporate treatment. It remains a legal entity. A domestic LLC with multiple members generally defaults to partnership treatment unless another classification is elected.
Bringing in a partner involves more than changing a percentage. Agree contributions, economic rights, signing authority, admission and exit arrangements, and the effective date. Our single-member and multi-member guide covers that transition; the Operating Agreement guide explains how the relationship is documented.
C-Corp: company-level taxation and shareholder governance
A corporation normally starts with C-Corp treatment. The ordinary federal rate is 21% of taxable income, not revenue and not the amount a shareholder withdraws. IRS Publication 542 explains corporate taxation. State taxes and the treatment of distributions are separate parts of the calculation.
For a limited illustration, USD 100,000 of corporate taxable income produces USD 21,000 of ordinary federal tax before credits or other applicable rules. The remaining USD 79,000 is not automatically the shareholder's net income: any distribution and the shareholder's circumstances still need analysis. This is not a savings comparison against an LLC.
A corporation can suit a business that needs share classes, investment agreements or governance arrangements particular investors want to use. Growth alone does not mean an LLC must be replaced. Review actual funding terms first, rather than designing the business around a hypothetical investment round.
S-Corp: establish eligibility before discussing savings
S-Corp status is a tax election, normally made using Form 2553, not an upgraded type of LLC. Income generally passes through to shareholders, although certain entity-level taxes can apply.
The IRS requirements for S corporations include no more than 100 shareholders, one class of stock and eligible shareholders. Nonresident alien shareholders are excluded. Certain individuals, trusts and estates can qualify; “only people living in the US” is not an accurate summary.
Citizenship and tax residence matter more than a mailing address. A US citizen living abroad is not a nonresident alien simply because they live overseas. Conversely, obtaining an ITIN does not make a foreign nonresident an eligible shareholder.
For an owner who does not meet the rules, planning should focus on the available LLC or corporation options. There is no value in recommending an election that the ownership cannot support.
Profit, reinvestment and distributions are separate questions
Keeping money in the business can fund operations, asset purchases or expansion. Reinvesting does not itself change the entity's tax classification.
Under pass-through treatment, an owner may be taxed without receiving a transfer to their personal account. A C-Corp's retained earnings do not escape corporate income tax merely because they stay in the company. The owner's residence country also applies its own rules to the entity and its income.
A useful review separates taxable profit, available cash and distributions. It also distinguishes contributed capital, loans, service payments and withdrawals. If your priority is investing retained capital, specify the assets, investment horizon and intended owner. Our explanation of profit, cash and distributions helps you prepare comparable figures.
For a nonresident alien owner, income source, income type and connection with US business activity matter. Owning an LLC or a US account does not settle those questions. Exentax connects the structure to the activity rather than assigning a tax result from a label.
Two examples of a useful entity decision
Illustrative scenario: two agency partners funding their own growth. Both contribute work and capital. They need to collect different currencies, hire contractors and decide how much profit stays in the business. Start with ownership, management, each member's residence and allocation of results. A multi-member LLC may offer flexible organisation without issuing preferred shares.
The next decisions are practical: who signs contracts, who approves payments and what happens if a partner leaves? Those agreements make the structure usable. The number of customers does not, on its own, require a corporation.
Illustrative scenario: a business negotiating with an investment fund. Review the proposed terms: economic rights, governance, incentives and future rounds. If the investor requires a corporation, compare direct incorporation with adapting an existing LLC. The recommendation should follow documented terms, not an assumption that every investment has the same requirements.
These are decision scenarios, not client testimonials or promised results. In either case, a good recommendation explains the chosen structure, the reasons and the facts that would justify reviewing it later.
Already have an LLC? Establish the current position first
Gather the formation document, EIN, current operating agreement, member details and filed tax elections. Add previous returns and a description of the activity. These documents distinguish a business that needs better organisation from one that actually needs a different tax classification.
Form 8832 allows an eligible entity to elect federal classification. It does not automatically change its state-law legal form. Review the effective date and consequences before filing. A legal conversion, by contrast, follows the applicable state procedure.
Not every conversion has the same tax outcome. Some transactions may qualify for nonrecognition when the requirements are met; neither automatic taxation nor automatic tax neutrality is a sound assumption. Our Form 8832 guide explains the decision separately from a change of trading name.
Annual documentation follows the classification
A foreign-owned disregarded entity with reportable transactions may need Form 5472 attached to a pro forma Form 1120. A partnership generally uses Form 1065 and Schedule K-1; a C-Corp files its corporate return. These are not interchangeable filing packages.
State renewals, federal tax work and banking administration should be planned separately. Compare the same scope and period when budgeting for different structures. Our LLC setup and annual-cost guide separates professional fees from public charges.
Questions about LLCs, C-Corps and S-Corps
Can an LLC be taxed as a C-Corp?
Yes, through the appropriate election when eligible. Its tax classification changes, but it remains an LLC under state law.
Do I need a C-Corp to run a professional business?
No. Professionalism comes from contracts, management, documentation and delivering what you agree. Legal form should follow ownership, funding and activity.
Does an ITIN allow me to elect S-Corp status?
Not by itself. An ITIN is a tax identification number; shareholder eligibility follows the specific S-Corp rules.
Can an LLC reinvest its profits?
Yes. Document the use of capital and distinguish reinvestment from the taxation of profit. Retaining money does not, by itself, determine when the owner is taxed.
Choose a structure you can operate and maintain
Exentax reviews ownership, activity, residence and plans before recommending a structure. We then coordinate formation or review, documentation, banking, payments and annual follow-up within the agreed scope. You work with a team that understands the business and can explain its decisions.
Bring your current position and your next objective: taking on a partner, operating internationally, investing or preparing for outside capital. The valuable first step is designing a company that serves that objective.