An S corporation (S corp) is a special tax classification under Subchapter S of the Internal Revenue Code that allows eligible small businesses to avoid double taxation by passing income, losses, deductions, and credits directly to shareholders.
How an S Corporation Works
An S corporation is not a business structure by itself but a tax election available to qualifying corporations and limited liability companies (LLCs). By filing IRS Form 2553, a business chooses to be taxed under Subchapter S of the Internal Revenue Code.
S corporations provide the same limited liability protection as traditional corporations, meaning shareholders’ personal assets are generally shielded from business debts and lawsuits. What makes them unique is taxation: profits and losses pass directly to shareholders’ personal tax returns, avoiding corporate-level federal income tax.
Shareholder-employees must also pay themselves a reasonable salary. Beyond that, additional profits may be distributed as dividends, which are not subject to self-employment tax. Still, S corps must follow corporate formalities such as bylaws, annual meetings, and record-keeping, which resemble the structure of a C corporation.
This election, created under Subchapter S in 1958, was designed to help small businesses enjoy the benefits of incorporation without the burden of double taxation.
Advantages of an S Corporation
One of the main benefits of an S corp is pass-through taxation, which ensures business income is taxed only once on shareholders’ returns. This can reduce overall tax liability, especially for small business owners.
Another advantage is limited liability protection. Shareholders are generally protected from company debts and lawsuits, keeping personal assets like homes or savings separate from business obligations.
S corporations may also improve a company’s credibility with lenders, partners, and clients. For owner-operators, payroll tax savings are possible because income can be split between salary and dividend distributions. Additionally, S corp shares can be transferred without affecting the entity’s continuity, unlike partnerships or sole proprietorships.
Disadvantages of an S Corporation
Despite these benefits, there are drawbacks to S corporations. Shareholder rules are strict: an S corp may have no more than 100 shareholders, all of whom must be U.S. citizens or residents. Partnerships, corporations, and foreign investors are not eligible.
S corps also attract closer IRS scrutiny, particularly around whether shareholder salaries are “reasonable.” Compliance requirements can be more demanding than an LLC, since S corps must adopt bylaws, hold annual meetings, and maintain detailed records.
Costs are another factor. State filing fees, registered agent services, and franchise taxes can add up. Finally, certain fringe benefits—such as health insurance for shareholders owning more than 2% of the company—are considered taxable compensation.
IRS Requirements for S Corporation Eligibility
To qualify as an S corporation, a business must meet the following IRS rules: it must be a domestic corporation or LLC, have no more than 100 shareholders, issue only one class of stock, and limit ownership to U.S. citizens or residents. In addition, the company must file IRS Form 2553 (Election by a Small Business Corporation) by the appropriate deadline.
How to Start an S Corporation
Starting an S corp begins with forming a corporation or LLC in your state. Business owners file Articles of Incorporation (or Articles of Organization for an LLC), appoint directors, draft bylaws, and issue shares. After obtaining an Employer Identification Number (EIN) from the IRS, the business can then elect S corporation status by submitting Form 2553.
Once approved, ongoing compliance includes holding shareholder meetings, keeping records, filing annual reports, and properly setting up payroll for shareholder-employees.
S Corporation vs. Other Business Structures
S corp vs. C corp: Both offer limited liability, but taxation is very different. A C corporation pays corporate income tax, and shareholders also pay taxes on dividends, leading to double taxation. An S corporation avoids this by passing income directly to shareholders’ personal returns.
S corp vs. LLC: LLCs are more flexible with management and ownership, and they have fewer formalities. However, LLC members often pay self-employment tax on all profits. An S corp can reduce that burden by treating part of income as dividends, though it comes with stricter IRS rules and eligibility requirements.
S corp vs. sole proprietorship or partnership: Sole proprietors and partners enjoy simplicity but have no liability protection—personal assets can be at risk. An S corporation provides liability shielding and potential tax advantages, though it requires more paperwork, compliance, and costs.
Frequently Asked Questions
Do I need a lawyer to start an S corporation?
Not always, but many business owners consult professionals to ensure compliance with state and IRS rules.
When should I elect S corp status?
Typically after incorporation or LLC formation. Form 2553 must be filed within 2 months and 15 days of the start of the tax year.
Can an LLC become an S corp?
Yes. An LLC can elect S corp taxation, blending LLC flexibility with S corp tax advantages.
What happens if I miss the Form 2553 deadline?
You may still qualify for late election relief if IRS requirements are met.
How many owners can an S corp have?
An S corporation can have up to 100 shareholders.
Can an S corporation be publicly traded?
No. Publicly traded companies must operate as C corporations.
Are S corp distributions taxable?
Distributions are not subject to self-employment tax, but shareholders still pay income tax on their share of profits.
Do all states recognize S corporations?
Most do, but a few impose different rules or taxes at the state level.
