How Are Corporations Taxed and What Rates Apply in 2026?

What Is a Corporation for Tax Purposes?

According to the Cornell Legal Information Institute, a corporation is recognized as a distinct legal entity separate from its owners under the law. When business owners learn how to start a corporation, they establish a structure that can conduct business, enter contracts, and incur liabilities in its own name. The federal government default classification for any newly formed corporation is a C-corporation unless the owners actively elect otherwise. This legal structure shields personal assets from business liabilities but also establishes a distinct framework for how the entity must file its annual returns.

Because the corporation is a separate taxpaying entity, its profits belong to the business rather than the shareholders. The corporation must file its own annual tax documents and pay federal taxes on its net income directly to the government. Procedures, tax rates, and filing forms vary significantly by state and are subject to frequent regulatory changes. This guide provides general information, not legal advice, and you should consult a licensed attorney or tax professional for your specific situation as of our latest verification in June 2026.

How Do C-Corporations and S-Corporations Differ?

Before deciding on a business structure, owners must evaluate how C-corporations and S-corporations differ in their taxation, ownership limits, and filing requirements. The structural choice dictates whether profits face entity-level taxation or pass directly to personal tax returns. Below is a comparison of these two corporate structures for the 2026 tax year.

How Are Corporations Taxed under C-Corporation Rules?

What Is the Federal Corporate Income Tax Rate?

The federal government taxes C-corporations on their net taxable income, which is calculated as gross receipts minus allowable business deductions. According to the Internal Revenue Service (IRS), the flat federal corporate income tax rate is 21 percent for the 2026 tax year. This flat rate applies regardless of whether a corporation earns a modest income or millions of dollars in annual taxable profits. The corporate tax remains a major source of federal revenue, accounting for billions of dollars in annual government receipts.

• A flat 21 percent federal corporate income tax on all taxable business profits.
• Annual federal tax filing using Form 1120, the U.S. Corporation Income Tax Return.
• The requirement to make quarterly estimated tax payments if the corporation expects its annual tax liability to be $500 or more.
• Mandatory electronic filing (e-file) for corporations that file 10 or more returns of any type in a calendar year.

Why Does the Double Taxation of Corporations Happen?

The double taxation of corporations is a defining characteristic of C-corporation status under IRS rules. Under this system, corporate profits are taxed first at the corporate level at the flat 21 percent rate when earned. Then, when the corporation distributes those post-tax profits to shareholders as dividends, the shareholders must report and pay taxes on those dividends on their individual returns. This distribution does not qualify as a business deduction for the corporation itself.

Shareholders are also prohibited from deducting any net operating losses incurred by the C-corporation on their personal tax returns. Dividend tax rates vary depending on whether the dividends are classified as qualifying or non-qualifying by the IRS. Qualifying dividends are capped at a maximum rate of 23.8 percent, which includes a 3.8 percent net investment income tax. Non-qualifying dividends are taxed as ordinary income at rates up to 40.8 percent as of June 2026.

How Are S-Corporations Taxed by the IRS?

What Is an S Corporation and How Does Pass-Through Taxation Work?

An S-corporation is a special tax status elected under Subchapter S of the Internal Revenue Code (IRC) rather than a distinct business entity type under state law. This election allows the corporation to pass its profits, losses, deductions, and credits directly to its shareholders. The S-corporation itself does not pay federal income tax at the corporate level, bypassing the corporate tax entirely. Profits are distributed to shareholders, who report their allocated share on their personal tax returns utilizing Schedule K-1 (Form 1120-S).

The distributed income is then taxed at the shareholder’s individual income tax rate, which can be highly advantageous for small business owners. Shareholders may also be eligible for the qualified business income deduction, which can further reduce their personal tax liability. However, shareholders must pay self-employment taxes on any wages they receive as employees of the S-corporation. Managing these dual payment structures requires careful payroll administration to maintain compliance with federal guidelines.

What Are the S-Corp Qualification Requirements?

Not every business can elect S-corporation status because the IRS enforces strict eligibility rules. If a corporation fails to meet these criteria at any point, its S-corporation status is terminated, and it reverts to a C-corporation. To qualify for and maintain S-corporation status, a company must meet several federal requirements.

• Be a domestic corporation organized under the laws of a US state.
• Have only allowable shareholders, which includes individuals, certain trusts, and estates, but excludes partnerships, corporations, or non-resident alien shareholders.
• Limit the total number of shareholders to no more than 100 individuals.
• Have only one class of stock, meaning all shares must carry identical economic rights to distributions and liquidation.
• File Form 2553, Election by a Small Business Corporation, signed by all shareholders.

How Is Corporate Taxable Income Calculated?

What Are Common Corporate Tax Deductions and Credits?

A corporation calculates its taxable income by subtracting allowable business expenses from its gross receipts. The IRS permits corporations to deduct ordinary and necessary expenses incurred in the operation of the business. These deductions directly reduce the corporation’s overall tax liability and determine the final profit margin. The exact deductions available can vary based on the industry and the nature of the corporate operations.

• Cost of Goods Sold (COGS), which covers the direct expenses associated with producing or purchasing the products sold by the business.
• Employee Compensation, including wages, salaries, bonuses, and eligible benefits paid to officers and employees.
• Business Interest Expense, although the federal government limits net interest deductions to 30 percent of adjusted taxable income for larger businesses.
• Depreciation, allowing the business to write off the cost of physical assets over their useful lives, though full expensing benefits are phasing out at 20 percent per year.
• Research and Development (R&D) Credits, which provide direct tax offsets for businesses investing in qualifying scientific or technological innovation.

What Is the Corporate Alternative Minimum Tax?

The Corporate Alternative Minimum Tax (CAMT) was reintroduced to ensure that large corporations pay a minimum level of tax regardless of their deductions. The CAMT imposes a 15 percent minimum tax on the adjusted financial statement income of certain large corporations. This minimum tax specifically targets corporations with average annual adjusted financial statement income exceeding $1 billion over a three-year period. For the vast majority of small and mid-sized businesses, the CAMT does not apply, and their federal tax remains strictly tied to the flat 21 percent rate.

How Do State Corporate Taxes Work?

How Do State Income Tax Rates and Apportionment Work?

In addition to federal taxes, corporations are usually subject to income or franchise taxes in the states where they conduct business. State tax laws vary widely, and some states do not levy a corporate income tax at all, while others impose significant rates. Information from USA.gov highlights that state-level corporate taxes can represent a substantial portion of a business’s total tax burden. Understanding these localized rules is essential for businesses operating across multiple state lines.

• Varying Tax Rates, ranging from zero percent in states like South Dakota and Wyoming to over nine percent in states like Minnesota and California.
• Nexus Rules, which determine whether a corporation has a sufficient physical or economic presence in a state to be subject to its tax laws.
• Apportionment Formulas, which dictate how a multi-state corporation splits its income among states based on factors like payroll, property, and sales within each state.
• Franchise Taxes, which are fees levied by some states for the privilege of doing business or holding a corporate charter in that state.

How Do You File and Pay Corporate Taxes?

Filing and paying corporate taxes requires strict adherence to IRS schedules and formatting guidelines to avoid costly penalties. Unlike individuals, corporations must manage their tax obligations throughout the fiscal year. The standard process for filing and paying C-corporation taxes involves several key steps. These requirements are strictly enforced and require accurate financial recordkeeping throughout the year.

• Determine your tax year, which can be either a calendar year ending December 31 or a fiscal year ending on the last day of any other month.
• Calculate and pay quarterly estimated taxes using Form 1120-W if the expected annual tax liability exceeds $500.
• Prepare and file Form 1120 by the 15th day of the fourth month following the close of the corporation’s tax year, which is typically April 15 for calendar year filers.
• Request an automatic six-month filing extension using Form 7004 if the corporation needs additional time to compile its financial records, though this does not extend the time to pay any taxes owed.
• Submit all payments electronically using the Electronic Federal Tax Payment System (EFTPS) to comply with modern IRS transactional mandates.