2026 Corporate Income Tax Calculator Tax Year 2026
Estimate your 2026 federal and state corporate income tax liability with our comprehensive calculator. Based on the 21% federal flat rate for C corporations, with support for state tax estimation, deductions, general business credits, and corporate alternative minimum tax (CAMT).
2026 Corporate Income Tax Overview
The 2026 corporate income tax system for C corporations features a flat 21% federal tax rate on all taxable corporate income. Unlike individual income tax, there are no graduated brackets , the rate does not increase as profits rise.
2026 Federal Corporate Tax Rate
Since 2018, the federal corporate tax rate has been 21%. This rate applies to taxable income, which is determined by a business's revenue minus expenses.
| Entity Type | Tax Rate | Tax Treatment |
|---|---|---|
| C Corporation | 21% flat rate | Taxed at corporate level |
| S Corporation | Pass-through | Taxed on shareholder returns |
| LLC | Pass-through | Taxed on member returns |
| Partnership | Pass-through | Taxed on partner returns |
Source: IRS 26 USC 11
State Corporate Income Tax
Forty-four states levy a corporate income tax, with top rates ranging from a 2.0% flat rate in North Carolina to an 11.5% top marginal rate in New Jersey. The average top marginal rate is approximately 6.57%, while the median is 6.5%. Some states have no corporate income tax but instead impose gross receipts taxes.
Corporate Alternative Minimum Tax (CAMT)
The Corporate Alternative Minimum Tax (CAMT) is a 15% minimum tax on adjusted financial statement income (AFSI) of certain large C corporations. The CAMT increases a taxpayer's tax to the extent that the tentative minimum tax exceeds regular tax plus base erosion and anti-abuse tax (BEAT). The CAMT applies to corporations with average annual AFSI exceeding $1.0 billion for the preceding three-year period.
General Business Credit
The general business credit is a collection of tax credits that reduce a corporation's income tax liability. For corporations, the general business credit cannot exceed net income tax minus 25% of net regular tax liability above $25,000.
How the Calculator Works
- Calculate Gross Profit: Gross Revenue minus Cost of Goods Sold.
- Calculate Operating Income: Gross Profit minus Operating Expenses.
- Calculate Net Income: Operating Income plus Other Income minus all deductions (depreciation, interest, charitable contributions, other deductions).
- Calculate Federal Tax: Net Income × 21% flat rate.
- Calculate State Tax: State taxable income (apportioned) × state tax rate.
- Apply Tax Credits: Subtract general business credit, foreign tax credit, and R&D credit from total tax.
- Apply Corporate AMT (CAMT): If applicable, calculate 15% of AFSI and compare to regular tax.
- Calculate Tax Due/Refund: Total tax minus estimated tax payments.
Important Disclaimer
This calculator provides estimates for educational and planning purposes. It does not constitute official tax advice. Actual tax liability may vary based on your specific circumstances, including additional deductions, credits, phaseouts, and state tax rules. Always consult a qualified tax professional or the IRS for accurate tax guidance.
❓ Corporate Income Tax Calculator FAQ
What is the 2026 federal corporate tax rate?
The federal corporate income tax rate for C corporations is a flat 21% on all taxable corporate income. This rate has been in effect since 2018.
Does this calculator work for S corporations and LLCs?
Yes, the calculator supports all entity types. However, S corporations, LLCs, and partnerships are pass-through entities , their income is taxed on the owners' personal tax returns, not at the corporate level. The calculator shows the tax that would apply if the entity were a C corporation.
What is the Corporate Alternative Minimum Tax (CAMT)?
CAMT is a 15% minimum tax on adjusted financial statement income (AFSI) of large C corporations. It applies to corporations with average annual AFSI exceeding $1.0 billion for the preceding three-year period.
What state corporate tax rates are available?
State corporate income tax rates range from 0% to over 11%. The calculator includes common state rates, with New Jersey at 11.5% (highest). You can also enter a custom rate.
What is the General Business Credit?
The General Business Credit is a collection of tax credits that reduce a corporation's income tax liability. For corporations, it cannot exceed net income tax minus 25% of net regular tax liability above $25,000.
What deductions can a corporation claim?
Corporations can deduct ordinary and necessary business expenses including cost of goods sold, operating expenses, depreciation, interest expense, charitable contributions, and other business-related deductions.
What is state apportionment?
State apportionment is the percentage of a corporation's income that is taxable in a particular state. It's typically based on the corporation's sales, payroll, and property within the state.
Are there any states without corporate income tax?
Yes. Nevada, Ohio, Texas, and Washington impose gross receipts taxes instead of corporate income taxes. South Dakota and Wyoming levy neither a corporate income tax nor a gross receipts tax.
How do I calculate taxable income?
Taxable income is calculated as: Gross Revenue − Cost of Goods Sold − Operating Expenses − Other Deductions + Other Income.
Is this calculator free?
Yes, this calculator is completely free to use. No registration or personal data storage is required. All calculations are performed in your browser.