DEPARTMENT OF REVENUE SERVICES - business ct 2026

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  1. Click ‘Get Form’ to open it in the editor.
  2. Begin by entering your taxpayer information as it appears on your joint Connecticut income tax return. This includes your first name, middle initial, last name, and Social Security Number.
  3. Next, provide your spouse's information in the designated fields, ensuring accuracy with their name and Social Security Number.
  4. Fill in your mailing address and daytime telephone number. Make sure to check the boxes regarding eligibility for filing this form.
  5. Proceed to the Allocation Items section. Enter the amounts for Connecticut adjusted gross income, total tax, and any tax withheld from W-2/1099 forms. Attach all necessary documents as specified.
  6. Complete the declaration section by signing and dating the form. If applicable, ensure that a paid preparer signs as well.

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How much does a business license cost in Connecticut? License NameCostLink Business License (Certificate of Organization) $50 $250+ for the initial filing fee for registering a business with the state Connecticut State Department of Consumer Protection Business Licenses, Registrations, + Permits
The Business Entity Tax is required to be paid to the Department of Revenue Services (DRS) by a business entity subject to the tax on or before the fifteenth day of the fourth month following the close of each taxable year of the entity.
Connecticut Small Business Development Center They can be reached at 860-576-0641 or via their website.
Register online at the Connecticut Department of Revenue Services website. Allow approximately 10 business days to receive your Connecticut Tax Registration Number. If you need to speak with the Department of Revenue Services, call 860-297-5962.
The Department of Administrative Services (DAS) is the nerve center for state government. From statewide human resources to information technology to building and construction services to procurement to fleet operations to grant administration and more, DAS helps state government function.

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Phone (ask questions and request paper forms by mail): 860-297-5962 (from anywhere) 800-382-9463 (Connecticut calls outside the Greater Hartford calling area only) 860-297-4911 (TTY, TDD, and Text Telephone users only)
You can contact us by phone if you need help with a tax account issue (well need your name and social security number to resolve any issues). You can use the following phone numbers: 800-829-1040 for individuals (Form 1040 filers) 800-829-4933 for business callers.
To perform a CT LLC lookup, visit the Connecticut Secretary of States website at ct.gov. Enter the businesss name or identification number in the search bar to access relevant details about the LLC, such as registration status and ownership information.

form ct 8379