Fillable Online Form CT-5.1 Request for Additional Extension of Time to ... 2026

1. Click ‘Get Form’ to open it in our editor.
2. Begin by entering the tax period, including the beginning and ending dates, along with your Employer Identification Number (EIN) and file number.
3. Fill in your business telephone number, legal name of the corporation, trade name/DBA, and mailing address. Ensure all information is accurate to avoid processing delays.
4. Indicate your state or country of incorporation and provide additional details if you are a foreign corporation.
5. In the section requesting an additional extension, mark an X in the appropriate boxes for the forms you are filing. If applicable, complete the combined group information by entering the EIN of the designated agent or parent.
6. Provide a detailed explanation for needing additional time to file in the designated area.
7. Finally, certify that all information is true by signing and providing contact details for both the authorized person and preparer if applicable.

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