Corporate Tax Calculator (C-Corp)

Calculate C-Corp federal and state tax at 21% flat rate. See double taxation on dividends.

By Konstantin Iakovlev · Updated April 2026 · Source: SBA — Business Guide

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Total Corporate Tax

$53,712.00

Effective Corp Rate

29.8%

Total Tax (incl. Dividends)

$61,212.00

Corporate Tax

Gross Revenue$500,000.00
Business Expenses- $200,000.00
Officer Compensation- $120,000.00
Taxable Income$180,000.00
Federal Tax (21%)$37,800.00
California Tax (8.8%)$15,912.00
Total Corporate Tax$53,712.00

Double Taxation on Dividends

Dividends Distributed$50,000.00
Shareholder Dividend Tax (15%)$7,500.00
Net After Dividend Tax$42,500.00
Total Tax Burden (Corp + Dividend)$61,212.00

Use the Corporate Tax Calculator (C-Corp) above to calculate your results. Enter your values and see instant results — all calculations run in your browser.

Disclaimer: This calculator is for informational purposes only and does not constitute tax, financial, or legal advice. Results are estimates based on the information you provide and current rates. Always consult a qualified tax professional or financial advisor for advice specific to your situation.

How It Works

C-Corporations face a federal tax bill calculated at a flat 21% rate, and this tool estimates that liability alongside any state tax your corporation owes. It also lays out the double taxation problem that defines the C-Corp structure: profits are taxed once at the company level, then taxed again when distributed to owners as dividends. Seeing both layers together helps when weighing whether a C-Corp is the right structure for your business.

Federal tax is figured by applying the 21% flat rate to taxable income. State tax uses a rate you supply, applied to that same taxable income figure. On the dividend side, the tool subtracts the distribution from after-tax profit and then shows the tax an individual shareholder would pay on qualified dividends, using 15% as a representative rate for many income brackets in 2026, so the second layer of taxation is visible rather than hidden.

State income tax is easy to overlook, yet it can move your total burden considerably depending on where you operate. It also helps to recall that the 21% federal rate is a single flat percentage, not a graduated bracket schedule like the one individuals face. Treat every figure here as an estimate and confirm specifics with a tax professional, since compliance details vary.

Example: A C-Corp's Tax Journey to Shareholder Pockets

  1. 1 Input your C-Corp's estimated taxable income, the state income tax rate, and the percentage of after-tax profit you plan to distribute as dividends.
  2. 2 The calculator will first determine your federal tax at 21%. Then, it will calculate your state tax. These two amounts are subtracted from your taxable income to arrive at your after-tax corporate profit. Finally, it will calculate the individual tax on distributed dividends.
  3. 3 You'll see your estimated federal tax, state tax, and the remaining corporate profit after all corporate taxes. Crucially, you'll also see the estimated individual tax paid on the distributed dividends, highlighting the double taxation effect.
  4. 4 This output provides a clear picture of your C-Corp's tax burden and the additional tax shareholders face on dividend income. This information is vital for comparing C-Corps with other business structures like S-Corps or LLCs, especially when considering profit distribution strategies.

Source: SBA — Business Guide · Last updated: April 2026

Frequently Asked Questions

What is the corporate tax rate for 2026?
The federal corporate tax rate is a flat 21% on all taxable income in 2026. Unlike individual taxes, there are no graduated brackets. State corporate taxes add 0-12% on top, depending on the state. The combined effective rate for most C-corps is 25-30%.
What is double taxation on corporate dividends?
C-corp profits are taxed at 21% at the corporate level, then dividends paid to shareholders are taxed again as qualified dividends (0%, 15%, or 20% depending on the shareholder bracket). For example, $100 of profit becomes $79 after corporate tax, then $67-$79 after dividend tax. This is why many small businesses prefer S-corp or LLC taxation.
When does a C-corp make sense over an S-corp?
A C-corp may be better if you plan to reinvest profits in the business (21% corporate rate vs higher individual rates), seek venture capital or go public, or want to offer stock options. If you plan to distribute most profits, an S-corp or LLC usually results in lower total tax.

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