Connecticut Corporations Forms Availability

Form CT-1120I, Computation of Interest Due on Underpayment of Estimated Tax

01/15/2026

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Form CT-1120 ES, Estimate Corporation Business Tax

01/15/2026

Form CT-1120K, Business Tax Credit Summary

01/15/2026

Form CT-1120, Corporation Business Tax Return

01/15/2026

Form CT-1120 ATT, Corporation Business Tax Return, Sch H, I, and J

01/15/2026

Form CT-1120 EXT, Application for Extension of Time to File Corporation Business Tax Return

01/15/2026

Form CT-1120A, Corporation Business Tax Return, Apportionment Computation

01/15/2026

Form CT-1120AB, Summary of Add Back and Exceptions to Add Back of Interest and Intangible Expenses

01/15/2026

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Form CT-1120PE, Pass-Through Entity Tax Credit

01/15/2026