⬤ CPA-Led Entity & Tax Guidance
The S Corporation, explained for owners and founders
Keep the liability shield of a corporation while skipping the double layer of tax. Here is how an S corp works, who qualifies, how it compares to an LLC and a C corp, and how to set one up.
What an S corporation is
An S corporation is not a type of company you register at the state level. It is a federal tax election. You first form a corporation (or, in many cases, an LLC) under state law, and then you ask the IRS to tax that entity under Subchapter S of the tax code by filing an election. Once the election is in place, the entity is treated as an S corp for federal tax purposes.
The defining feature of an S corp is pass-through taxation. A standard corporation, known as a C corporation, is taxed twice: once on its profits at the corporate level, and again on the dividends shareholders receive. An S corp avoids that second layer. It generally pays no federal income tax of its own; instead, its profits, losses, deductions, and credits flow through to the shareholders, who report them on their personal returns and pay tax at their individual rates.
How an S corp works
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Formation and election
The business is first registered with the state as a corporation. To become an S corp, the entity then files the election with the IRS on Form 2553, provided it meets the eligibility requirements. Without that election, the entity remains taxed as a C corporation by default.
Ownership and management
Shareholders own the S corp through the shares they hold. They elect a board of directors to oversee the company, and the board appoints officers who run day-to-day operations. This creates a clear line between ownership and management, the same structure any corporation follows.
Profit distribution
An S corp can pay its owners through salary, through distributions, or through a mix of both. An owner who also works in the business must be paid a reasonable salary that is subject to payroll tax. Profit taken beyond that salary can be distributed to shareholders, and those distributions are not subject to self-employment tax.
Pass-through taxation
The entity itself does not pay federal corporate income tax. Its profits and losses pass through to the shareholders and land on their personal tax returns, where each reports their share of income, deductions, and credits and is taxed at their own individual rate. A business running at a loss can pass that loss through as well.
Limited liability
Like any corporation, an S corp gives its shareholders limited liability. Their personal assets are generally shielded from the debts and obligations of the business, which is one of the main reasons owners incorporate in the first place.
Benefits and drawbacks of an S corp
S corp status carries real advantages, but it is not the right fit for every business. Here is the honest balance sheet.
Benefits
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Avoiding double taxation.
Profit is taxed once, at the shareholder level, rather than at both the corporate and shareholder levels.
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Passing losses through.
A loss can flow to shareholders and potentially offset other income on their personal returns, lowering their overall tax.
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Reducing self-employment tax.
Profit distributed beyond a reasonable salary is not hit with self-employment tax, which can produce meaningful savings.
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Keeping limited liability.
Shareholders are generally protected from business debts, lawsuits, and other liabilities.
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Adding credibility.
Operating as an incorporated entity can lend standing with customers, suppliers, lenders, and prospective hires.
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Continuity of existence.
The corporation can continue even if an owner leaves or passes away.
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Smoother ownership transfer.
Shares can be sold or gifted relatively cleanly, which helps with succession and exit planning.
Drawbacks
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Shareholder limits.
No more than 100 shareholders, all of whom must be U.S. citizens or residents, which restricts how widely it can raise capital.
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One class of stock.
Only a single class is allowed, so the entity cannot offer the preferred shares many outside investors expect.
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Higher personal tax in some cases.
A highly profitable S corp can leave owners paying more at their individual rates than under a corporate rate.
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More IRS attention.
The tax advantages mean S corps tend to draw closer scrutiny, so careful records matter.
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The reasonable salary test.
Owner-employees must take a salary the IRS would consider reasonable, and setting that figure defensibly takes judgment.
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More formalities.
Bylaws, the S election, regular meetings, and detailed records are all expected.
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Rigid profit allocation.
Profits and losses must be split strictly in proportion to ownership.
IRS eligibility rules
Not every business can elect S corp status. The IRS sets clear conditions, and all of them must be met.
01
The entity must be a domestic corporation, formed under the laws of a U.S. state or territory.
It can have no more than 100 shareholders. For this count, certain family members may be treated as a single shareholder.
Shareholders must be individuals, or certain trusts or estates. Partnerships, corporations, and non-resident aliens generally cannot hold shares.
Only one class of stock is permitted, although differences in voting rights between shares are allowed.
Certain businesses are ineligible, including some financial institutions, insurance companies, and domestic international sales corporations.
The entity must make the election on Form 2553, signed by all shareholders, and file it within the IRS window: no later than two months and fifteen days into the tax year the election is to take effect, or at any time in the prior year.
If the election is filed late, S corp status may not begin until the following tax year, unless the IRS grants relief for the late filing under specific circumstances.
S corp vs. LLC
Both give owners liability protection without the double tax of a C corp, but they suit different needs. One important point: an S corp is a tax status, while an LLC is a legal entity, and an LLC can itself elect to be taxed as an S corp. The table below treats the S corp in its classic corporate form.
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S corp
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LLC
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Formation
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State filing plus IRS S election
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State filing, simpler setup
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Taxation
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Pass-through; possible payroll-tax savings on distributions
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Pass-through by default; can elect other treatment
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Ownership
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Up to 100 U.S. shareholders only
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Unlimited members, no restrictions
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Management
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Board, officers, formal meetings
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Flexible; members or managers
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Liability
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Personal assets generally protected
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Personal assets generally protected
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Best for
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Owners wanting tax savings within a set structure
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Owners wanting flexibility and simple setup
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S corp vs. C corp
S corps and C corps are formed the same way at the state level. The differences lie in how they are taxed, who can own them, and what kinds of investment they can attract.
Tax treatment
A C corp pays corporate income tax on its profits, and shareholders then pay tax again on dividends, the classic double tax. An S corp passes income, losses, deductions, and credits to shareholders, who report them on personal returns, so the corporate-level tax is avoided.
Ownership and stock
A C corp has no ownership limits and can issue multiple classes of stock with different rights, which appeals to venture investors who want preferred shares. An S corp is capped at 100 U.S. shareholders or residents and limited to one class of stock, though voting rights may differ.
Best suited for
C corps fit larger, growth-focused businesses that plan to raise significant outside capital or go public. S corps suit small and mid-sized businesses that expect to stay privately held and want to avoid double taxation while distributing profits to owners.
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S corp
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C corp
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Formation
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Articles, bylaws, stock, meetings, plus S election
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Articles, bylaws, stock, meetings
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Taxation
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Pass-through; avoids double tax
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Corporate tax plus tax on dividends
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Ownership
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Max 100 U.S. shareholders; one class of stock
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No limits; multiple classes of stock
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Management
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Board and officers
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Board and officers
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Liability
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Personal assets generally protected
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Personal assets generally protected
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Best for
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Privately held businesses avoiding double tax
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Businesses seeking major outside investment
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How to form an S corp
If your business meets the requirements, forming an S corp follows a clear sequence.
- Form a corporation
- Choose a unique business name that follows your state’s naming rules and is not already taken.
- Prepare and file articles of incorporation with your state’s business filing office, setting out the company’s basic details, purpose, and structure.
- Adopt bylaws covering operating rules, shareholder rights, and procedures for meetings and decisions.
- Appoint directors and officers to run the company’s affairs.
- Issue shares to the shareholders according to their ownership percentages.
- Elect S corp status
Complete and file Form 2553 with the IRS, signed by all shareholders, within the allowed window.
- Obtain an EIN
Apply for an Employer Identification Number through the IRS. Even if the business already has an EIN, a new one may be required for the S corp.
- Meet ongoing requirements
- Hold annual shareholder and board meetings to observe corporate formalities.
- Keep detailed records of transactions, meeting minutes, and shareholder information.
- File the annual income tax return on Form 1120-S and issue a Schedule K-1 to each shareholder reporting their share of income, deductions, and credits.
Frequently asked questions
A tax status. You form a corporation (or an eligible LLC) under state law, then elect to be taxed under Subchapter S with the IRS. The S corp label describes how the entity is taxed, not how it is legally organized.
The entity generally pays no federal corporate income tax. Its profits and losses pass through to shareholders, who report them on their personal returns. Tax is paid once, at the shareholder level, rather than at both the corporate and shareholder levels as with a C corp.
Yes. An LLC that meets the eligibility rules can elect to be taxed as an S corp by filing the election with the IRS. It keeps its LLC legal structure while being taxed under Subchapter S.
Owners who also work in the business must be paid a reasonable salary subject to payroll tax. The rule exists so owners cannot take all of their profit as distributions, which would avoid payroll tax entirely. Setting a defensible salary figure is an area the IRS watches closely.
No more than 100, and they must all be U.S. citizens or residents. Certain family members can be counted as one shareholder. The entity is also limited to a single class of stock.
Form 2553, signed by all shareholders. It generally must be filed no later than two months and fifteen days into the tax year the election is to take effect, or during the prior year.
Get Started
Thinking about an S corp election? Get the structure right from the start.
Choosing and maintaining an S corporation involves eligibility rules, a reasonable-salary standard, and ongoing filings that are easy to get wrong and costly to fix. Countsure is a CPA-led firm that helps owners choose the right entity, make the election cleanly, and stay compliant year after year.
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