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Ct 5 1 2026
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- Click ‘Get Form’ to open the CT-5.1 in the editor.
- Begin by entering the tax period, including your Employer Identification Number (EIN) and file number. Ensure these details are accurate as they are crucial for processing.
- Fill in your business telephone number, legal name of the corporation, and trade name/DBA if applicable. If your mailing name differs from your legal name, provide that information as well.
- Complete the address section with your state or country of incorporation, street address or PO box, city, state, and ZIP code.
- Indicate whether you are requesting an additional extension for specific forms by marking an X in the appropriate boxes for Articles 9, 9-A, or 33.
- If applicable, provide details regarding combined group filings by entering the EIN of the designated agent or parent company and marking the relevant boxes.
- In the certification section, ensure that an authorized person signs and provides their printed name, title, email address, and phone number.
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Related links
If you have already applied for an extension of time to file your return(s) and you still need more time, use. Form CT-5.1 to request an additional three-month.Read more
Connecticut State Community College promotes student success through affordable access to academically rigorous and innovative education.Read more
Dec 10, 2025 File one Form CT-5.1 when requesting an additional three-month extension for both your tax return and MTA surcharge return.Read more