C-Corporation Taxation vs. S-Corps and LLCs: Key Differences

S-corporations and LLCs are popular because they generally allow business income to pass through to owners and be taxed only once. C-corporations operate under a different system that can result in taxation at both the corporate and shareholder levels. Understanding these differences helps business owners choose the structure that aligns with their goals.

Entity-Level Taxation

A C-corporation is a separate taxable entity. It pays federal corporate income tax on its profits at a flat 21% rate. When after-tax profits are later distributed to shareholders as dividends, those shareholders pay tax again on the dividends at their individual rates. This creates double taxation.

S-corporations and most LLCs avoid this by using pass-through taxation. Income and losses flow directly to the owners' personal tax returns, where they are taxed only once at the individual level. There is normally no tax paid at the business entity level.

Self-Employment and Payroll Taxes

In a C-corporation, working owner-employees receive W-2 wages that are subject to payroll taxes. Dividends themselves are not subject to self-employment tax. However, the corporate-level tax on profits often outweighs any potential payroll tax advantage compared with an S-corporation.

With an S-corporation, only reasonable salary is subject to payroll taxes, while distributions above that salary are generally not subject to self-employment tax. Default LLCs typically subject nearly all net business income to self-employment tax.

Qualified Business Income Deduction

The 20% Qualified Business Income deduction is available to S-corporations and LLCs taxed on a pass-through basis. C-corporations do not qualify for this deduction.

Retaining Earnings Inside the Business

C-corporations can retain earnings within the company and pay only the 21% corporate tax rate on those profits. This feature can support businesses that plan to reinvest heavily for growth before making distributions to owners.

In S-corporations and LLCs, income passes through to owners each year and is taxed at the individual level whether or not it is actually distributed. Owners may need to withdraw funds simply to cover their tax liability.

Fringe Benefits for Owner-Employees

C-corporations generally provide more favorable tax treatment for certain fringe benefits offered to owner-employees. Health insurance, group-term life insurance, and other benefits can often be fully deductible by the corporation without immediate taxable income to the owner.

S-corporations and LLCs face more restrictions. For example, health insurance premiums for S-corp shareholders owning more than 2% must be included in their W-2 wages.

Depreciation and Losses

Depreciation rules, including Section 179 and 100% bonus depreciation available in 2026, apply to C-corporations at the entity level. Corporate losses stay within the C-corporation and can generally be carried forward as net operating losses.

In pass-through entities, depreciation deductions and losses flow through to the owners and are subject to basis, at-risk, and passive activity limitations on their personal returns.

When a C-Corporation Might Make Sense

C-corporations are less common for small, owner-operated businesses because of double taxation. They are more often considered when a company intends to retain most earnings for significant growth, needs to offer extensive fringe benefits, plans to raise venture capital or go public, or has foreign investors. S-corporations have ownership restrictions that C-corporations do not.

Practical Takeaway

For most small businesses—particularly those where owners actively work in the company and plan to distribute profits—an S-corporation or LLC taxed as a pass-through entity usually provides more tax-efficient results. C-corporations are typically chosen for specific strategic reasons tied to retention of earnings or future financing needs.

Entity selection depends on current profit levels, growth plans, ownership structure, and long-term objectives. Tax outcomes can vary significantly based on individual facts and state rules. Business owners should consult a qualified tax professional to determine the most suitable structure for their situation.