Start a Business in Connecticut

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This guide on starting your business in Connecticut provides step-by-step instructions on the paperwork to file formation documents, obtain tax IDs, and set up company records.

how to start a business

Step-By-Step Startup

Below is an overview of the paperwork, cost, and time to form each of the most popular business structures. Simply click on the link for your desired structure to view detailed step-by-step instructions.

  • If you have not decided whether you want to form an LLC, corporation, or other business structure, click here.
  • If wish to form your business in a different state than Connecticut, click here.
Structure Paperwork Cost Time

Connecticut Limited Liability Company

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  • Form LC-1-1.0: Articles of Organization for a Domestic Limited Liability Company
  • Operating Agreement
  • IRS Form SS-4: Obtain an EIN
  • Form REG-1: Business Tax Registration Application
  • Formation: ~3-5 business days. ~24 hours for $50 expedite fee.

Connecticut Corporation

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  • Form CIS-1-1.0: Certificate of Incorporation for a Stock Corporation
  • Initial report
  • Bylaws
  • IRS Form SS-4: Obtain an EIN
  • Form 2553: S-Corp Election, if desired
  • Form CR-0100: Colorado Sales Tax Withholding Account Application, if required
  • Form REG-1: Business Tax Registration Application
  • Incorporation: $250 for up to 20,000 authorized shares (see fee schedule for more shares) + optional $50 expedite fee
  • Initial report: $150
  • Incorporation: ~3-5 business days. ~24 hours for $50 expedite fee.

Connecticut Nonprofit

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  • Form CIN-1-1.0: Certificate of Incorporation Nonstock Corporation
  • Form COS-1-1.0: Organization and First Report - Stock or Non-Stock Corporations
  • Bylaws
  • IRS Form SS-4: Obtain an EIN
  • IRS Form 1023: 501(c) Tax Exempt Application
  • IRS Determination Letter
  • Form REG-1: Business Tax Registration Application
  • CERT-119: Purchases of Tangible Personal Property and Services by Qualifying Exempt Organizations
  • Connecticut Initial Charitable Organization Registration Application
  • Incorporation: $50 + optional $50 expedite fee
  • First Report: $50
  • 501(c): $275 or $600 IRS fee
  • Connecticut charitable registration: $50 ($0 if exempt)
  • Incorporation: ~3-5 business days. ~24 hours for $50 expedite fee.
  • 501(c): 2 weeks to 3 months

Top 5 Tips on Registering a Business in Connecticut

  1. Registration in Connecticut is pretty predictable - that's a good thing. The process, forms, and fees, are average compared to other states.
  2. If you want to be fancy, you can use a corporate designator (e.g. "Corp", "LLC") in another language. Connecticut is one of the few states that permits this.
  3. Turnaround on formation is ~3-5 business days. If you're in a hurry, you can get ~24 hour turnaround for only a $50 state expedite fee.
  4. Corporations are required to file an initial report within 30 days of incorporation. LLCs do not have a similar requirement. Both corporations and LLCs must file an annual report.
  5. Connecticut offers a consolidated state tax registration application. You will obtain a Connecticut Tax Registration Number. State business taxes include corporation business tax, business entity tax (BET), sales and use taxes, income tax withholding, and motor vehicle fuels tax.
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