"S corporation or LLC?" is a common question and a slightly mismatched one. An LLC is a state-law entity. An S corporation is a federal tax status. An LLC can elect to be taxed as an S corporation, and the real decision is how the business will be taxed, how its owners will be paid and what the owners want in terms of liability protection and administration. This article gives a framework for the conversation.
How the IRS classifies the options
- Sole proprietorship. An unincorporated business with one owner and no legal identity separate from the owner. The owner reports the business on Schedule C of Form 1040.
- Partnership. Two or more people carrying on a business together. The partnership files Form 1065 and does not pay income tax. The partners report their shares.
- LLC. A state-created entity. By default, a single-owner LLC is a disregarded entity taxed like a sole proprietorship, and an LLC with two or more owners is taxed as a partnership, unless it elects to be taxed as a corporation. The IRS says members of an LLC that files a partnership return generally pay self-employment tax on their share of earnings.
- C corporation. A separate taxpayer filing Form 1120. Income is taxed at the corporate level, and shareholders may be taxed again on dividends.
- S corporation. A corporation that elects pass-through treatment on Form 2553. It files Form 1120-S and passes income, losses, deductions and credits through to shareholders on Schedule K-1.
The IRS adds that the structure that makes the most sense depends on each owner's circumstances.
S corporation eligibility
The IRS lists the requirements. The corporation must be a domestic corporation. Shareholders can be individuals, certain trusts and estates, but not partnerships, corporations or nonresident aliens. There can be no more than 100 shareholders and only one class of stock. Certain financial institutions, insurance companies and domestic international sales corporations do not qualify. The corporation files Form 2553 signed by all shareholders. An S corporation may still owe tax on certain built-in gains and passive income.
Timing matters. The election is due no more than 2 months and 15 days after the start of the tax year it is to take effect. For a calendar-year corporation, a Form 2553 filed by March 16, 2026 took effect for 2026, and a later filing takes effect for 2027 unless late-election relief applies. Rev. Proc. 2013-30 provides that relief if the request is made within 3 years and 75 days of the intended effective date and the entity shows reasonable cause and meets the other conditions in the revenue procedure.
The questions to settle in order
- Liability. Does the owner want a state-law shield? That is an LLC or corporation question, and state law governs. The SBA notes that owners of an LLC are generally not personally liable for business debts.
- Number and type of owners. A single owner and individual shareholders fit S status. Entity owners, nonresident owners or multiple classes of equity do not. Partnership-style special allocations are generally unavailable in an S corporation because of the one-class-of-stock rule.
- Profit level and owner involvement. S corporation status separates wages from distributions. Wages carry payroll tax and distributions do not, and the IRS requires reasonable compensation for working shareholders. At low profit levels, payroll administration and compensation requirements can erase the benefit. See S corporation reasonable compensation.
- QBI deduction. Pass-through income can qualify for the section 199A deduction and C corporation income cannot. See the QBI deduction after the 2025 legislation.
- Growth and exit. Plans for outside investors, more than 100 owners or a corporate buyer may point to a C corporation. Exit tax consequences differ for stock and asset sales, and the allocation of purchase price is covered in M&A tax structure.
- State taxes. State treatment of S corporations and LLCs varies, including entity-level taxes and fees. Record the state result for each state where the entity operates. The glossary entry on pass-through entity tax covers elective entity-level taxes.
Administrative load
An S corporation is a payroll employer for its working owners, files a separate Form 1120-S and issues Schedules K-1. The owner's compensation, health insurance and retirement plan reporting each have their own rules. A single-member LLC taxed as a disregarded entity has none of that, and owner income appears on Schedule C. The firm's fee model and the client's cash flow should both account for the added compliance.
Changing course
Entities can change status. An LLC can elect S treatment, and the S election can be revoked. Each move has timing rules, basis consequences and sometimes tax costs. Do the analysis before filing, record the reasoning and confirm the effective date. If an election is made late, treatment begins with the following tax year unless the client qualifies for relief under Rev. Proc. 2013-30, described in the Form 2553 instructions.
Documentation to keep
- A one-page entity decision memo listing options considered, the factors weighed and the recommendation.
- The signed Form 2553 or Form 8832 and proof of filing.
- Shareholder or member eligibility confirmations.
- Compensation analysis for each working owner.
- Evidence of the IRS acceptance letter.
FAQ
Can an LLC be taxed as an S corporation?
Yes. An LLC can elect corporate tax treatment and S status if it meets the eligibility requirements.
Does an S corporation pay tax?
Generally income passes through to the shareholders. The corporation can owe tax on certain built-in gains and passive income.
Which is better for liability protection?
Liability protection comes from state law, not from the tax classification.
CORAA prepares ready-to-review audit files for US CPA firms; see /us.
Sources
- IRS, S corporations: https://www.irs.gov/businesses/small-businesses-self-employed/s-corporations
- IRS, LLC filing as a corporation or partnership: https://www.irs.gov/businesses/small-businesses-self-employed/llc-filing-as-a-corporation-or-partnership
- IRS, Choosing a business structure (FS-08-22): https://www.irs.gov/pub/irs-news/fs-08-22.pdf
- SBA, Choose a business structure: https://www.sba.gov/business-guide/launch-your-business/choose-business-structure
- IRS, Publication 509 (2026), Tax Calendars: https://www.irs.gov/publications/p509
- IRS, Revenue Procedure 2013-30: https://www.irs.gov/pub/irs-drop/rp-13-30.pdf
Part of CORAA University · Tax and compliance for CPA firms: related guides, calculators and templates.
AU-C references are to AICPA Professional Standards, paraphrased here; read the standard itself before relying on a requirement. This page is guidance, not professional advice. Report an error