Connecticut Corporate Tax Calculator

Connecticut's top state corporate tax rate is approximately 7.50%. Estimate your federal + state corporate tax below.

Estimated Total Tax in Connecticut
$0
Federal Corporate Tax (21%)$0
Connecticut State Corporate Tax$0
Effective Tax Rate0%
Business Type Note—

What is the corporate tax rate in Connecticut?

Connecticut's top marginal state corporate income tax rate is approximately 7.50%. C-Corporations pay this on top of the flat 21% federal corporate tax rate. For example, a C-Corp with $150,000 in net income would owe about $31,500 in federal tax and about $11,250 in Connecticut state corporate tax, for a combined estimate of about $42,750.

How are S-corps and LLCs taxed in Connecticut?

S-Corporations and LLCs are typically pass-through entities: profit isn't taxed at the federal corporate level, but instead flows through to the owner's personal income tax return, taxed at their individual rate. Many states, including Connecticut, still apply some form of entity-level or franchise tax to pass-through businesses — this calculator applies Connecticut's corporate rate as an illustrative state-level estimate for pass-through entities too, since actual treatment (flat fees, gross receipts tax, elective PTE tax) varies and isn't always a straight percentage of net income.

This is a simplified estimate for general planning purposes only, not tax advice — consult a CPA or tax attorney familiar with Connecticut business tax law for guidance specific to your situation.

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Frequently Asked Questions

What is Connecticut's corporate tax rate?

Connecticut's top state corporate income tax rate is approximately 7.50%. C-Corporations pay this in addition to the flat 21% federal corporate tax rate.

Does Connecticut have a state corporate income tax?

Yes. Connecticut imposes a state corporate income tax with a top marginal rate of approximately 7.50% on C-Corporation net income.

How much corporate tax would a C-Corp pay in Connecticut?

A C-Corp with $150,000 in net income in Connecticut would owe about $31,500 in federal corporate tax (21%) plus about $11,250 in state corporate tax, for a combined estimate of about $42,750. Use the calculator above with your own numbers for a precise estimate.

Are S-corps and LLCs taxed differently than C-corps in Connecticut?

Yes. S-Corporations and LLCs are typically pass-through entities — profit flows to the owner's personal tax return and is taxed at their individual income tax rate instead of a separate corporate rate. Connecticut may still apply some entity-level tax to pass-through businesses, which this calculator estimates using the state's corporate rate as an illustrative figure.

Is Connecticut a good state to incorporate in for lower taxes?

Connecticut's corporate tax rate of approximately 7.50% is in the middle range compared to other states — where to incorporate typically depends on more than just the tax rate, including where you have nexus and operations.

Is this Connecticut corporate tax calculator official tax advice?

No. This tool provides a simplified estimate using approximate federal and Connecticut state corporate tax rates. It doesn't account for deductions, credits, apportionment across states, or your personal tax situation. Consult a CPA or tax attorney licensed in Connecticut for advice specific to your business.