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This version of the form is not currently in use and is provided for reference only. Download this version of
Form CT-1065 (CT-1120SI)
for the current year.
Form CT-1065 (CT-1120SI) Supplemental Attachment - Connecticut
What Is Form CT-1065 (CT-1120SI)?
This is a legal form that was released by the Connecticut Department of Revenue Services - a government authority operating within Connecticut. Check the official instructions before completing and submitting the form.
FAQ
Q: What is Form CT-1065?
A: Form CT-1065 is the Connecticut Partnership Return of Income form.
Q: What is Form CT-1120SI?
A: Form CT-1120SI is the Connecticut Supplemental Income Tax form.
Q: What is the Supplemental Attachment?
A: The Supplemental Attachment is an additional form that must be attached to either Form CT-1065 or Form CT-1120SI, depending on the type of business entity.
Q: When is Form CT-1065 (CT-1120SI) due?
A: Form CT-1065 (CT-1120SI) is due on or before the 15th day of the fourth month following the close of the taxable year.
Q: Who needs to file Form CT-1065 (CT-1120SI) and the Supplemental Attachment?
A: Partnerships and S corporations that derive income from or have a nexus with Connecticut need to file Form CT-1065 and the Supplemental Attachment.
Q: What information is required on the Supplemental Attachment?
A: The Supplemental Attachment requires information such as the partnership or corporation's name, address, federal identification number, and details of the partnership or corporation's operations in Connecticut.
Q: Are there any penalties for failing to file Form CT-1065 (CT-1120SI) and the Supplemental Attachment?
A: Yes, there are penalties for late filing or failure to file Form CT-1065 (CT-1120SI) and the Supplemental Attachment. It is important to file the forms accurately and on time to avoid these penalties.
Q: Can I file Form CT-1065 (CT-1120SI) and the Supplemental Attachment electronically?
A: Yes, Connecticut allows electronic filing of Form CT-1065 (CT-1120SI) and the Supplemental Attachment. Electronic filing is convenient and can help ensure timely submission of the forms.
Form Details:
- Released on December 1, 2021;
- The latest edition provided by the Connecticut Department of Revenue Services;
- Easy to use and ready to print;
- Quick to customize;
- Compatible with most PDF-viewing applications;
- Fill out the form in our online filing application.
Download a printable version of Form CT-1065 (CT-1120SI) by clicking the link below or browse more documents and templates provided by the Connecticut Department of Revenue Services.
Download Form CT-1065 (CT-1120SI) Supplemental Attachment - Connecticut
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