S Corp vs. C Corp: Taxation, Benefits, and Decision-Making Guide

When you incorporate a business in the United States, you get to decide how it will be taxed. That choice comes down to two paths: the C Corporation and the S Corporation. Both share the same legal foundation. Both provide liability protection. But they work very differently when it comes to taxes, shareholder rules, and long-term growth strategy.

The right choice for your business depends on your income level, your plans for investors, and whether you want to go public someday. This guide covers the key differences between S Corps and C Corps, the tax math that separates them, and a clear framework for making the right call.

What is a Corporation?

A corporation is a legal entity that exists separately from the people who own it. The business can enter contracts, own property, hire employees, take on debt, and be sued as its own entity. Shareholders who own the corporation are generally not personally liable for the corporation’s obligations.

Both S Corporations and C Corporations share this legal foundation. The difference between them is not about the legal structure. It is about which part of the Internal Revenue Code governs how they are taxed.

What is a C Corporation?

A C Corporation takes its name from Subchapter C of the Internal Revenue Code, which governs its tax treatment. It is the default tax classification for any corporation in the United States. If you form a corporation and do not file an S Corporation election, your business is automatically taxed as a C Corporation.

The IRS treats a C Corporation as a separate taxpaying entity. The corporation files Form 1120 and pays federal income tax at the flat corporate rate of 21% on its profits. If the corporation then distributes those after-tax profits to shareholders as dividends, shareholders pay personal income tax on those dividends. This two-level tax burden is what people call double taxation.

Despite the double taxation issue, C Corporations offer structural advantages that make them the preferred choice for growth-oriented businesses. There is no limit on the number of shareholders, no restriction on who can be a shareholder, and no limit on the types of stock a C Corporation can issue. Foreign nationals, corporations, LLCs, and trusts can all own C Corporation stock. This flexibility makes the C Corporation the standard structure for venture-backed startups and publicly traded companies.

How Do You Start a C Corporation?

Forming a C Corporation starts with incorporating at the state level. MyCorporation handles the complete filing process, including Articles of Incorporation, bylaws, and EIN registration. The general steps are:

• Choose a unique business name and reserve it with your state
• Appoint a registered agent with a physical address in your state
• File Articles of Incorporation with the Secretary of State
• Draft and adopt corporate bylaws
• Hold an organizational meeting with your board of directors
• Issue stock to founding shareholders
• Obtain an EIN from the IRS using Form SS-4

Your corporation defaults to C Corporation tax status unless you separately file Form 2553 to elect S Corporation treatment. No additional IRS filing is needed to become a C Corporation.

What is an S Corporation?

An S Corporation is not a different type of corporation from a C Corporation. It is the same incorporated entity with a different federal tax election. The name comes from Subchapter S of the Internal Revenue Code.

When a corporation elects S Corporation status, it becomes a pass-through entity for federal income tax purposes. The corporation itself does not pay federal income tax on its profits. Instead, profits, losses, deductions, and credits flow through to the shareholders and are reported on their personal tax returns. Shareholders then pay tax on their share of business income at their individual income tax rates.

This pass-through structure eliminates the double taxation that applies to C Corporations. For small business owners who draw most of their income from the business, avoiding that second layer of tax is often the primary motivation for electing S Corporation status.

S Corporations also offer a meaningful self-employment tax advantage. An owner who works in the S Corporation can pay themselves a reasonable salary and take additional profits as shareholder distributions. The salary portion is subject to Social Security and Medicare taxes (currently 15.3% combined), but the distribution portion is not. This reduces total self-employment tax compared to a sole proprietorship or partnership where the entire net profit is subject to self-employment tax.

How to elect S Corporation status

You do not form an S Corporation directly. You first form a corporation at the state level, then file Form 2553 with the IRS to elect S Corporation tax treatment. All current shareholders must sign the form.

The filing deadline matters. To make the election effective for the current tax year, Form 2553 must be filed by March 15 for calendar-year corporations (the 15th day of the third month of the tax year). If filed after that date, the election takes effect in the following tax year, unless you can show reasonable cause for the late filing. Several states also require a separate state-level S Corporation election after the federal election is approved.

MyCorporation can assist you with both the state incorporation filing and the S Corporation election. The steps are:

• File Articles of Incorporation with your state
• Hold an initial board meeting and issue stock
• Get an EIN from the IRS
• File Form 2553 with the IRS to elect S Corp status (all shareholders must sign)
• Create S Corporation bylaws
• File any required state-level S Corp election documents

Comparison Between S Corporation and C Corporation

What S Corps and C Corps Have in Common

Despite their tax differences, S Corporations and C Corporations share more in common than most people realize.

• Both are incorporated at the state level using the same Articles of Incorporation filing.
• Both offer limited liability protection. Shareholders are generally not personally responsible for business debts or legal claims against the corporation.
• Both require the same governance structure: shareholders, a board of directors, and corporate officers.
• Both must follow corporate formalities: adopt bylaws, hold annual meetings, issue stock, file annual reports, and maintain a registered agent.
• Both are required to file corporate tax returns with the IRS, even though the forms differ (Form 1120 for C Corps, Form 1120-S for S Corps).

The distinction between S and C is a federal tax classification, not a different legal structure. When you see the designation on a business registration or certificate of incorporation, it refers to the entity’s tax election, not its legal form.

S Corp vs C Corp: Key Differences at a Glance

Factor	C Corporation	S Corporation
Tax treatment	Double taxation: 21% corporate tax + personal tax on dividends	Pass-through: no corporate tax, income taxed on personal returns
Federal tax form	Form 1120	Form 1120-S
Shareholders allowed	Unlimited	Maximum 100
Who can be a shareholder	Anyone: US and foreign individuals, corporations, LLCs, trusts	US citizens and permanent residents only; no corporations or LLCs
Classes of stock	Multiple classes (common, preferred, different voting rights)	One class only (voting rights can differ; economic rights must be equal)
Self-employment tax savings	None (shareholders taxed on salary only)	Yes: distributions above reasonable salary avoid SE tax
Go public (IPO)	Yes	No
Venture capital / institutional investors	Yes	No (most funds cannot invest in S Corps)
IRS election required	No (default status)	Yes (Form 2553, filed separately after incorporation)
QBI deduction eligibility	No	Yes (up to 20% deduction on qualified business income)

S Corp vs C Corp Tax Comparison

Taxes are the most important practical difference between S Corps and C Corps for most small business owners. Here is what the numbers actually look like.

Example: A business earns $200,000 in net profit with a single owner.

Under a C Corporation:

• Corporate income tax at 21% on $200,000: $42,000.
• If the remaining $158,000 is distributed as a dividend, the owner pays qualified dividend tax (typically 15% for most taxpayers): approximately $23,700.
• Total federal tax on $200,000 of business income if fully distributed: approximately $65,700.
• If profits are retained and not distributed, only the $42,000 corporate tax applies. Retained earnings benefit from the 21% flat rate.

Under an S Corporation:

• The owner pays themselves a reasonable salary of $80,000. Payroll taxes at 15.3% on the salary: approximately $12,240.
• The remaining $120,000 is taken as a shareholder distribution. No self-employment tax applies to this portion.
• The full $200,000 is reported as personal income and taxed at the owner’s marginal rate, but self-employment tax is only paid on the $80,000 salary.
• Self-employment tax saved on $120,000: approximately $18,360.

For most small business owners earning $75,000 to $500,000 annually, S Corporation status results in meaningful tax savings compared to the C Corporation default. At higher income levels, especially when the business retains significant earnings, the 21% corporate rate may be more efficient than pass-through income taxed at the highest personal marginal rates.

S Corporation owners who qualify may also deduct up to 20% of qualified business income (QBI) under Section 199A of the Tax Cuts and Jobs Act. This deduction is not available to C Corporation shareholders and can reduce the effective tax rate on S Corporation income by several percentage points for eligible owners.

Which is better? A C Corp or an S Corp?

So who wins in the battle of C corporation vs S corporation? What differences between C and S corporations make one better for your business than the other? Let’s dive in…

C Corporation Pros and Cons

C Corporation Advantages

• Unlimited shareholders with no restrictions on who can invest. Foreign nationals, corporations, LLCs, trusts, and institutional funds can all own C Corporation stock.
• Multiple classes of stock enable complex investment structures. Common stock, preferred stock, and shares with different voting or dividend rights are all available.
• Venture capital and institutional investors can participate. Most investment funds cannot legally invest in S Corporations but face no restrictions with C Corporations.
• Path to an IPO. A C Corporation can list shares on public markets; an S Corporation cannot due to the shareholder cap.
• Retained earnings efficiency. Profits retained in the business and not distributed to shareholders are taxed at the flat 21% corporate rate, which may be lower than the owner’s personal marginal rate at high income levels.
• Flexible employee benefits. C Corporations can deduct certain employee benefits (health insurance, life insurance) as business expenses without those benefits being included in employees’ taxable income.

C Corporation Disdvantages

• Double taxation on distributed profits. Corporate income is taxed at 21% and distributed dividends are taxed again as personal income.
• No QBI deduction for shareholders. The 20% qualified business income deduction available to S Corporation shareholders does not apply to C Corporation dividends.
• More complex tax filings. The corporate return (Form 1120) involves more complexity than the pass-through approach, particularly when managing the interaction of retained earnings and dividends.
• Higher effective tax rate on distributions. For owners who plan to distribute most profits, double taxation often results in a higher combined tax burden than pass-through taxation.

S Corporation Pros and Cons

S Corporation Disadvantages

• Pass-through taxation eliminates double taxation. Shareholders pay tax once on business income at their personal rates.
• Self-employment tax savings. Owner-operators can pay themselves a reasonable salary and take additional profits as distributions not subject to Social Security and Medicare taxes.
• QBI deduction eligibility. Qualifying S Corporation shareholders may deduct up to 20% of qualified business income on personal returns.
• Loss pass-through. S Corporation losses flow to shareholders and can offset other personal income, subject to at-risk and passive activity limitations.
• Simpler tax compliance. No corporate-level tax return requires payment, only an informational return (Form 1120-S).

S Corporation Disadvantages:

• Limited to 100 shareholders, which prevents an IPO and limits the ability to raise large amounts of equity capital.
• Shareholders must be US citizens or permanent residents. Foreign nationals cannot invest. Corporations, LLCs, and most partnerships cannot hold S Corporation shares.
• Only one class of stock is permitted. Investors who want preferred stock, liquidation preferences, or other special economic rights cannot get them in an S Corporation.
• Transfer restrictions apply. S Corporations typically restrict shareholder transfers to avoid inadvertently adding an ineligible shareholder, which would terminate S Corp status.
• Reasonable salary requirement. The IRS requires owner-employees to pay themselves a salary the IRS deems reasonable. Paying too little to maximize distributions can trigger penalties.
• State-level treatment varies. Some states do not recognize S Corporation status and tax the entity at the state corporate level regardless of the federal election.

Can an S Corporation Own a C Corporation?

Yes. An S Corporation can own shares in a C Corporation. Holding stock in a C Corporation is treated as an investment, and investment income from a C Corporation does not affect an S Corporation’s tax election or eligibility.

The reverse is generally not allowed. A C Corporation cannot be a shareholder in an S Corporation, because IRS rules require S Corporation shareholders to be individuals (or certain qualifying trusts), not corporations.

There is a narrow exception called the Qualified Subchapter S Subsidiary (QSub) election, where an S Corporation that owns 100% of another corporation can elect to treat that subsidiary as a QSub. This is different from a C Corporation owning an S Corporation and involves specific filing requirements. Consult a tax advisor before structuring any parent-subsidiary relationship involving an S Corporation.

Can a C Corporation Own an S Corporation?

Generally, no. IRS rules prohibit corporations from being shareholders in an S Corporation. If a C Corporation acquires shares in an S Corporation, the S Corporation loses its S election automatically and is treated as a C Corporation from the date the ineligible shareholder acquired ownership.

This termination of S status can have significant tax consequences and requires a five-year waiting period before the company can re-elect S Corporation status. If you are considering an acquisition or ownership restructuring involving an S Corporation, consult a tax attorney before any share transfers occur.

How Do I Know If My Corporation Is an S Corp or C Corp?

All corporations start as C Corporations by default. If your company has never filed Form 2553 with the IRS, it is taxed as a C Corporation.

You can confirm your tax status through a few methods:

• Check your most recent corporate tax return. C Corporations file Form 1120. S Corporations file Form 1120-S. The form type tells you the current classification.
• Look for your Form 2553 acceptance letter from the IRS. If your accountant or formation service filed an S election, you should have an IRS letter confirming the election date.
• Call the IRS Business and Specialty Tax Line at 800-829-4933. The IRS can confirm your corporation’s current tax classification.

If your business is an LLC, the default classification is different. Single-member LLCs are treated as disregarded entities by default. Multi-member LLCs are treated as partnerships. An LLC can elect C Corporation or S Corporation tax treatment by filing the appropriate forms with the IRS, but it remains an LLC under state law.

Is a Nonprofit Corporation a C Corporation or S Corporation?

Neither. Nonprofit corporations are a separate category that does not use either the C Corporation or S Corporation designation.

A nonprofit is incorporated at the state level like any other corporation, but instead of electing C or S Corporation tax treatment, it applies for tax-exempt status under Section 501(c) of the Internal Revenue Code. A 501(c)(3) organization, for example, is exempt from federal income tax entirely and is not classified as a C Corporation or S Corporation for tax purposes.

The C Corp and S Corp designations describe how a for-profit corporation is taxed. Nonprofit tax-exempt status is a separate IRS classification that operates independently of the Subchapter C and Subchapter S frameworks.

On IRS Form W-9, a nonprofit organization should not check the C Corporation or S Corporation box. It should check Other and write in the applicable tax-exempt designation, such as 501(c)(3) exempt organization.

S Corp vs C Corp on Form W-9

When a business fills out IRS Form W-9 for a client or payer, the form asks you to check whether you are a C Corporation or S Corporation. Here is how to fill it out correctly.

• If your corporation has never filed Form 2553 with the IRS, check C Corporation.
• If your corporation filed Form 2553 and received IRS approval, check S Corporation.
• If your business is an LLC taxed as a C Corporation or S Corporation, check the appropriate box and note that you are an LLC with that election.
• If your business is a nonprofit with 501(c) tax-exempt status, check Other and write in your exempt organization type.

Checking the wrong box does not change your actual tax status, but it can create confusion with payers who report income on 1099 forms. If you are unsure of your current IRS tax classification, check your most recent corporate return or contact the IRS at 800-829-4933.

S Corp vs C Corp vs LLC: A Brief Comparison

LLCs are not corporations. They are a distinct type of business entity governed by state law with flexible ownership and management rules. The comparison between LLCs and corporations comes up frequently because many small business owners consider all three options.

By default, a single-member LLC is taxed as a disregarded entity (no separate business return), and a multi-member LLC is taxed as a partnership. Both avoid double taxation without needing an S Corporation election. However, LLC owners who earn significant income still owe self-employment tax on all net profits.

An LLC can elect to be taxed as an S Corporation by filing Form 2553 with the IRS. This allows the LLC to keep its flexible management structure under state law while benefiting from S Corporation pass-through taxation and the self-employment tax savings on distributions.

• Choose an LLC when you want flexibility, simplicity, and no plans to issue stock or raise institutional capital.
• Choose an S Corporation (or LLC taxed as S Corp) when your business generates significant profits and you want to minimize self-employment taxes while keeping pass-through taxation.
• Choose a C Corporation when you plan to raise venture capital, issue preferred stock, pursue an IPO, or bring in investors who cannot participate in an S Corporation.

Which Is Better: S Corp or C Corp?

There is no universal answer, but the decision becomes straightforward when you apply it to your specific situation.

Choose an S Corporation if:

• You are a small to medium business with active owner-operators
• You want to avoid double taxation on profits distributed to yourself
• You do not plan to raise venture capital or seek institutional investment
• Your shareholder base will stay at or below 100 people, all US citizens or residents
• You do not need preferred stock or multiple share classes
• You want to reduce self-employment taxes through the salary plus distribution structure

Choose a C Corporation if:

• You plan to raise venture capital, seek private equity investment, or pursue an IPO
• You need shareholders who are corporations, LLCs, trusts, or foreign nationals
• You want to issue preferred stock or multiple classes of shares with different rights
• You expect to retain significant profits in the business rather than distributing them
• You want to offer stock options or equity compensation to employees at scale

Both S Corp and C Corp are tax classifications rather than separate legal structures. This differs from LLCs, which are a distinct legal entity type. Whether you are choosing between S and C for your existing corporation or starting fresh, MyCorporation can help you incorporate in the right state and file the S Corporation election if applicable. Reach out to our team through the chat widget on MyCorporation.com.

Final Notes

Both S Corp and C Corp are tax elections that your business can choose depending on how they want to be taxed at the state and federal level. This differs from LLCs and LLPs which are legal entities for your business. When choosing whether you want your business to be taxed as an S Corp or a C Corp, consider if you want investors, what type of ownership and/or shareholder structure you want long term, and what type of taxation makes the most sense for you. If you have any questions about S Corps, C Corps, LLCs, or starting your own business, use the Chat Widget on MyCorporation.com to reach out to our support team!

Frequently Asked Questions

Is it better to be an S Corp or a C Corp?

It depends on your business goals and income level. S Corporations offer pass-through taxation and reduced self-employment taxes, which benefits most small business owners. C Corporations offer unlimited shareholders and multiple stock classes, which is better for businesses seeking venture capital or planning to go public. For most small business owners who will not be seeking institutional investors, S Corporation status often results in lower total taxes.

Is my LLC an S Corp or a C Corp?

By default, neither. A single-member LLC is taxed as a disregarded entity, and a multi-member LLC is taxed as a partnership. However, an LLC can elect to be taxed as an S Corporation by filing Form 2553 with the IRS, or as a C Corporation by filing Form 8832. If your LLC has made one of these elections, it will be taxed under the rules of the elected classification while remaining an LLC under state law. Check your most recent tax return to see which form was filed.

Why does S Corporation status exist?

S Corporation status was created by Congress to allow small businesses to incorporate and receive the liability protection of a corporation without suffering the double taxation that applies to C Corporations. Before S Corporation rules existed, small business owners who incorporated faced paying tax at both the corporate level and again on dividends received. S Corporation pass-through treatment puts small business owners in a more similar position to partners in a partnership, while still giving them corporate liability protection.

How much does it cost to form a corporation?

It can cost less than $500 to set up a corporation. Check out our article that talks about it! (Link to your cost article)

Can my business transition from a C Corp to an S Corp?

Yes. You can convert your C Corporation to S Corporation tax status by filing Form 2553 with the IRS, as long as your corporation meets all S Corporation eligibility requirements (under 100 shareholders, all US citizens or residents, only one class of stock, etc.). There is no mandatory waiting period to make this transition from C to S status. However, there can be tax consequences, including built-in gains tax if the corporation has appreciated assets at the time of conversion. If you previously held S Corporation status and voluntarily revoked it, you would need to wait five years before re-electing. Consult a tax advisor before making the switch.

What tax form does an S Corporation file?

An S Corporation files Form 1120-S, which is an informational return. The S Corporation itself does not pay federal income tax through this return. Instead, it issues each shareholder a Schedule K-1 showing their share of the corporation’s income, losses, deductions, and credits. Shareholders report this information on their personal tax returns and pay any tax owed at the individual level.

What is the corporate tax rate for a C Corporation?

The federal corporate income tax rate for a C Corporation is currently 21%, established by the Tax Cuts and Jobs Act of 2017. Before 2018, C Corporations faced graduated corporate tax rates up to 35%. Some states also impose state corporate income taxes on top of the federal rate, which varies by state. The combined federal and state corporate tax burden depends on the state where the corporation operates.

Can an S Corporation have preferred stock?

No. S Corporations are restricted to one class of stock. Preferred stock, by definition, grants certain shareholders different economic rights (such as priority in dividends or liquidation) that common shareholders do not have. Issuing preferred stock would create a second class of stock, which would automatically terminate the corporation’s S election. If your business needs to offer preferred stock to investors, you must operate as a C Corporation.

What is a reasonable salary for an S Corporation owner?

The IRS requires S Corporation owner-employees to pay themselves a reasonable salary before taking additional profits as distributions. Reasonable salary is based on what the market would pay someone in a similar role at a similar company. The IRS looks at factors including the owner’s duties, hours worked, the business’s revenue, and what comparable employees earn in the same industry. There is no fixed threshold, but significantly underpaying yourself to maximize untaxed distributions is a common audit trigger. Many tax advisors recommend working with a CPA to document the salary determination.

Does converting from S Corp to C Corp require waiting five years?

Converting from C Corporation status to S Corporation status has no mandatory waiting period. However, if a corporation previously held S Corporation status, voluntarily revoked that election, and now wants to re-elect S Corporation status, the IRS requires a five-year waiting period from the date of the prior revocation (unless the IRS consents to an earlier re-election). The five-year rule applies to re-elections after a voluntary revocation, not to initial S Corporation elections.

Ready to Form Your Corporation?

Whether you are starting a new corporation or electing S Corporation status for an existing business, MyCorporation provides expert filing services in all 50 states. From Articles of Incorporation to S Corp election filings and EIN registration, our team handles the paperwork so you can focus on running your business. Use the chat widget on MyCorporation.com to connect with our support team and get started today.