What is double taxation and how does it affect Connecticut C-Corporations?

Double taxation means C-Corporation profits are taxed twice: first at the corporate level under federal tax (21%) plus Connecticut's 7.5% corporate income tax, then again when distributed as dividends to shareholders at federal and Connecticut personal income tax rates. This differs fundamentally from Connecticut LLCs, which are pass-through entities where profits are taxed only once at the member level. The Connecticut Department of Revenue Services (DRS) Form CT-1065 filing requirements and dividend reporting obligations compound this complexity for C-Corps. This tax inefficiency makes C-Corporations most suitable only for businesses reinvesting profits rather than distributing them to owners. Consult a Connecticut CPA to model your specific scenario before electing C-Corporation status with the Connecticut Secretary of State.

When does a C-Corp actually save money on taxes compared to an LLC in Connecticut?

Whether a C-Corp lowers the total tax depends on your profit, how much of it stays in the business and your own tax bracket, so run the figures with a tax professional. Connecticut's top individual income tax rate is 6.99%, but the federal corporate tax rate is a flat 21%, creating a tax advantage when profits stay in the company. Additionally, C-Corps can deduct 100% of health insurance premiums, disability insurance, and other employee benefits as business expenses, whereas LLC owners can't deduct these same benefits against self-employment taxes. Connecticut also imposes a corporate business tax of 7.5% on C-Corp net income, but this structure becomes advantageous for high-earning owners who can split income between corporate and personal rates. However, C-Corps face double taxation: Connecticut requires filing Form CT-1120 annually, and retained earnings face both corporate and eventual shareholder-level taxation. The practical implication is that C-Corps only save money if you can reinvest profits long-term without distributing dividends. Consult a Connecticut CPA to calculate your specific tax liability before electing C-Corp status with the Connecticut Department of Revenue Services.

Can I convert my Connecticut LLC to a C-Corporation later?

Yes, you can convert your Connecticut LLC to a C-Corporation through a statutory conversion under Connecticut law, which allows direct conversion without dissolving your existing entity. File a Certificate of Conversion with the Connecticut Secretary of the State, along with your articles of conversion and conversion plan. Check the Secretary of the State's current fee for the Certificate of Conversion; the new corporation's own filing fee is $250. Alternatively, you can dissolve your LLC through the Secretary of the State and file a new Certificate of Incorporation ($250 filing fee), though this creates a new legal entity with a different tax ID and potential loss of contracts requiring the original LLC name. The key practical implication: converting mid-year triggers immediate C-Corporation taxation, potentially creating double taxation on retained earnings and requiring you to establish a new federal EIN with the IRS. Connecticut also requires filing Form CT-1120 for C-Corporations instead of Form CT-1065 for LLCs, changing your annual reporting obligations. Before proceeding, consult a Connecticut CPA to calculate state and federal tax consequences, then file your conversion documents with the Secretary of the State's Business Services Division.

Why do venture capital firms prefer C-Corporations over LLCs?

Venture capital firms strongly prefer C-Corporations because they enable the equity structures and investment mechanisms that VCs require. C-Corps allow multiple classes of stock, such as preferred shares with liquidation preferences and common shares, which VCs use to protect their downside while giving founders upside potential. In Connecticut, this flexibility matters because institutional investors, including pension funds and university endowments governed by ERISA regulations, are legally prohibited from investing in pass-through entities like LLCs. C-Corps also facilitate secondary market transactions; VCs can easily buy, sell, or transfer their shares without dissolving the company. Connecticut LLCs, by contrast, use membership interests rather than shares, creating complications when investors want to exit or adjust their stakes. Additionally, C-Corps' separate tax entity status simplifies due diligence for institutional investors during funding rounds. If you're seeking venture capital in Connecticut, structuring as a C-Corp from inception, by filing Articles of Incorporation with the Connecticut Secretary of State, positions your company to attract institutional funding. Without this structure, you'll likely be restricted to angel investors and smaller funds willing to navigate LLC complexities.

What are the ongoing state fees and taxes for Connecticut C-Corporations?

Connecticut C-corporations are subject to the Corporation Business Tax with a $250 minimum tax regardless of profit, plus a capital-base tax (0.31%, capped at $1M and being phased out) if it exceeds the income tax. On top of this, you'll owe Connecticut corporate income tax at 7.5% on net income, calculated and filed using Form CT-1120. Additionally, you must file an Annual Report each year with the Connecticut Secretary of the State, which costs $150 for a stock corporation and requires current officer and director information. These combined obligations mean Connecticut C-Corp owners face roughly $225 to $300 in minimum annual state fees before income taxes are calculated. Start by contacting the Connecticut Department of Revenue Services or visiting their website to calculate your specific franchise tax liability based on your planned capitalization.

Which business structure is better for a small Connecticut business?

For most small Connecticut businesses, an LLC is the better choice because it offers pass-through taxation that eliminates double taxation, simpler compliance, and lower formation costs. Connecticut LLCs cost $120 to file with the Connecticut Secretary of State, compared to $150 for C-Corps, and require minimal annual filings, just the biennial report due between January 1st and June 30th. The practical benefit: as an LLC owner, your business profits pass through to your personal tax return at Connecticut's individual income tax rates, avoiding the 21% federal corporate tax that C-Corps pay. You'll also skip Connecticut's $250 annual corporation tax required of all C-Corps. However, choose a C-Corp only if you're actively seeking venture capital funding, need to retain substantial profits for reinvestment, or plan an eventual IPO, investors expect the C-Corp structure these paths demand. To decide definitively, file your Certificate of Organization with Connecticut's Secretary of State once you've confirmed your LLC operating agreement includes liability protection language appropriate to your industry.

Connecticut LLC vs C-Corp: Choose the Right Structure for Your Business

Compare formation costs, taxes, and ownership rules to decide between an LLC and C-Corporation in Connecticut. Get the facts you need to make an informed choice.

By Edmond Hui · Last updated: October 2026

In Connecticut, an LLC fits when you want simple tax filing and avoid double taxation on business profits; a C-corp fits when you plan to raise money from venture capital firms or angel investors. Compare both structures in detail below.

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Comparison chart for Connecticut LLC versus C-Corp, contrasting liability, taxation and ongoing filing burden across 8 factors. — Side-by-side on the factors that decide the choice, for Connecticut. Source: Connecticut Secretary of the State.

LLC vs C-Corp: Side-by-Side

Factor	LLC	C-Corp
Formation cost	$120 state filing fee	$120 state filing fee plus incorporation documents
Taxation structure	Pass-through taxation (profits taxed once at owner level)	Double taxation (corporate tax + shareholder dividend tax)
Ownership limits	Unlimited owners, flexible ownership percentages	Unlimited shareholders, must issue stock certificates
Self-employment / payroll tax	Members pay self-employment tax on all profits	Owner-employees pay payroll taxes only on salary
Investor appeal	Limited appeal to venture capital and institutional investors	Preferred by VCs and angel investors for equity investments
State taxes in Connecticut	No entity-level state income tax, members pay personal income tax	Connecticut corporate income tax (7.5% rate) plus shareholder taxes
Administrative complexity	Minimal ongoing requirements, operating agreement recommended	Board meetings, shareholder meetings, corporate resolutions required
Profit distribution	Flexible profit sharing based on operating agreement	Dividends distributed proportionally to stock ownership

When an LLC Makes More Sense

You want simple tax filing and avoid double taxation on business profits
Your business has 1-5 owners who actively participate in operations
You prefer flexible management structure without formal board requirements
You don't plan to raise venture capital or go public in the future

When a C-Corp Makes More Sense

You plan to raise money from venture capital firms or angel investors
You want to retain significant profits in the business for growth (lower 21% corporate rate)
You need to offer equity compensation like stock options to employees
You're considering going public or selling to another corporation eventually

Tax Deep Dive

LLC Default Tax

Connecticut LLCs are pass-through entities by default, meaning business profits flow directly to members' personal tax returns. Members pay Connecticut personal income tax plus federal income tax on their share of LLC profits, whether distributed or not.

C-Corp Tax

C-Corporations face double taxation in Connecticut: the corporation pays federal corporate income tax (21%) and Connecticut corporate income tax (7.5%), then shareholders pay additional taxes on any dividends received. This creates a higher overall tax burden for distributed profits.

When a C-Corp Wins

C-Corporations become tax-advantageous when retaining significant earnings in the business, as the 21% federal corporate rate may be lower than high-earning owners' personal tax rates. Additionally, C-Corps can fully deduct employee benefits like health insurance, and Connecticut's corporate tax structure becomes favorable for companies planning major reinvestment rather than immediate profit distribution.

Calculate Your Tax Savings in Connecticut

Enter your profit and filing status to compare estimated annual taxes for LLC, S-Corp, and C-Corp side by side, specific to Connecticut.

This guide is general information, not legal or tax advice, and reading it does not create an attorney-client relationship. It reports published tax rates and statutory attributes, with the sources this page cites. It cannot tell you which structure is better for you: that turns on your profit, the salary you could defend as reasonable compensation, every state you owe tax in, and plans for owners, investors and exit that no figure on this page measures. Confirm your own position with a CPA or tax attorney licensed in your state before you elect anything, because some elections are slow or costly to reverse.

Frequently Asked Questions

: Double taxation means C-Corporation profits are taxed twice: first at the corporate level under federal tax (21%) plus Connecticut's 7.5% corporate income tax, then again when distributed as dividends to shareholders at federal and Connecticut personal income tax rates. This differs fundamentally from Connecticut LLCs, which are pass-through entities where profits are taxed only once at the member level. The Connecticut Department of Revenue Services (DRS) Form CT-1065 filing requirements and dividend reporting obligations compound this complexity for C-Corps. This tax inefficiency makes C-Corporations most suitable only for businesses reinvesting profits rather than distributing them to owners. Consult a Connecticut CPA to model your specific scenario before electing C-Corporation status with the Connecticut Secretary of State.
: Whether a C-Corp lowers the total tax depends on your profit, how much of it stays in the business and your own tax bracket, so run the figures with a tax professional. Connecticut's top individual income tax rate is 6.99%, but the federal corporate tax rate is a flat 21%, creating a tax advantage when profits stay in the company. Additionally, C-Corps can deduct 100% of health insurance premiums, disability insurance, and other employee benefits as business expenses, whereas LLC owners can't deduct these same benefits against self-employment taxes. Connecticut also imposes a corporate business tax of 7.5% on C-Corp net income, but this structure becomes advantageous for high-earning owners who can split income between corporate and personal rates. However, C-Corps face double taxation: Connecticut requires filing Form CT-1120 annually, and retained earnings face both corporate and eventual shareholder-level taxation. The practical implication is that C-Corps only save money if you can reinvest profits long-term without distributing dividends. Consult a Connecticut CPA to calculate your specific tax liability before electing C-Corp status with the Connecticut Department of Revenue Services.
: Yes, you can convert your Connecticut LLC to a C-Corporation through a statutory conversion under Connecticut law, which allows direct conversion without dissolving your existing entity. File a Certificate of Conversion with the Connecticut Secretary of the State, along with your articles of conversion and conversion plan. Check the Secretary of the State's current fee for the Certificate of Conversion; the new corporation's own filing fee is $250. Alternatively, you can dissolve your LLC through the Secretary of the State and file a new Certificate of Incorporation ($250 filing fee), though this creates a new legal entity with a different tax ID and potential loss of contracts requiring the original LLC name. The key practical implication: converting mid-year triggers immediate C-Corporation taxation, potentially creating double taxation on retained earnings and requiring you to establish a new federal EIN with the IRS. Connecticut also requires filing Form CT-1120 for C-Corporations instead of Form CT-1065 for LLCs, changing your annual reporting obligations. Before proceeding, consult a Connecticut CPA to calculate state and federal tax consequences, then file your conversion documents with the Secretary of the State's Business Services Division.
: Venture capital firms strongly prefer C-Corporations because they enable the equity structures and investment mechanisms that VCs require. C-Corps allow multiple classes of stock, such as preferred shares with liquidation preferences and common shares, which VCs use to protect their downside while giving founders upside potential. In Connecticut, this flexibility matters because institutional investors, including pension funds and university endowments governed by ERISA regulations, are legally prohibited from investing in pass-through entities like LLCs. C-Corps also facilitate secondary market transactions; VCs can easily buy, sell, or transfer their shares without dissolving the company. Connecticut LLCs, by contrast, use membership interests rather than shares, creating complications when investors want to exit or adjust their stakes. Additionally, C-Corps' separate tax entity status simplifies due diligence for institutional investors during funding rounds. If you're seeking venture capital in Connecticut, structuring as a C-Corp from inception, by filing Articles of Incorporation with the Connecticut Secretary of State, positions your company to attract institutional funding. Without this structure, you'll likely be restricted to angel investors and smaller funds willing to navigate LLC complexities.
: Connecticut C-corporations are subject to the Corporation Business Tax with a $250 minimum tax regardless of profit, plus a capital-base tax (0.31%, capped at $1M and being phased out) if it exceeds the income tax. On top of this, you'll owe Connecticut corporate income tax at 7.5% on net income, calculated and filed using Form CT-1120. Additionally, you must file an Annual Report each year with the Connecticut Secretary of the State, which costs $150 for a stock corporation and requires current officer and director information. These combined obligations mean Connecticut C-Corp owners face roughly $225 to $300 in minimum annual state fees before income taxes are calculated. Start by contacting the Connecticut Department of Revenue Services or visiting their website to calculate your specific franchise tax liability based on your planned capitalization.
: For most small Connecticut businesses, an LLC is the better choice because it offers pass-through taxation that eliminates double taxation, simpler compliance, and lower formation costs. Connecticut LLCs cost $120 to file with the Connecticut Secretary of State, compared to $150 for C-Corps, and require minimal annual filings, just the biennial report due between January 1st and June 30th. The practical benefit: as an LLC owner, your business profits pass through to your personal tax return at Connecticut's individual income tax rates, avoiding the 21% federal corporate tax that C-Corps pay. You'll also skip Connecticut's $250 annual corporation tax required of all C-Corps. However, choose a C-Corp only if you're actively seeking venture capital funding, need to retain substantial profits for reinvestment, or plan an eventual IPO, investors expect the C-Corp structure these paths demand. To decide definitively, file your Certificate of Organization with Connecticut's Secretary of State once you've confirmed your LLC operating agreement includes liability protection language appropriate to your industry.

Sources

3 documents

Each entry below is a document recorded in our verified Connecticut sources, and each entry says what the document is. Some statutory text is read from an accurate mirror rather than from the state's own host, and those say so. Where we hold the citation but no stable public link, the citation is printed on its own rather than pointed at a guessed address.

Connecticut statute: Connecticut General Statutes § 34-245 (statutory conversion)
business.ct.gov/business-servicesConnecticut Secretary of the State: business entity filings
business.ct.gov/-/media/businessonestop/fee-schedule-revised-712020.pdfConnecticut LLC filing fees

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Edmond Hui · Founder, MyStateLLC

Edmond Hui is a software engineer and serial entrepreneur based in New York who has founded multiple online businesses across e-commerce, media, and information publishing. Before transitioning into tech, he spent years as a commercial real estate professional closing deals totaling over 100,000 square feet, giving him firsthand experience with business formation and entity structuring. He built MyStateLLC to provide the free, state-specific LLC guidance he wished existed when forming his own companies.

How we check facts

LLC vs C-Corp: Side-by-Side

When an LLC Makes More Sense

When a C-Corp Makes More Sense

Tax Deep Dive

LLC Default Tax

C-Corp Tax

When a C-Corp Wins

Calculate Your Tax Savings in Connecticut

Frequently Asked Questions

Sources

More for Connecticut LLCs

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Taxes, money and growth

Stay compliant

Operate in other states

Compare structures

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By profession

Ready to Form Your Connecticut LLC?

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