Connecticut S-Corporations Form Availability
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Form CT K-1, Member's Share of Certain Connecticut Items
01/15/2026
01/15/2026
Form CT-1120SI, Supplemental Attachments
01/15/2026
01/15/2026
Form CT-1120SI EXT, Application for Extension of Time to File Connecticut Composite Income Tax Return
01/15/2026
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Connecticut Composite Income Tax Return
01/15/2026
01/15/2026