DRS will be holding a webinar on Wednesday, May 14, 2025, at 10:00 a.m.  This session will provide an overview of the sales and use tax requirements pertaining to swimming pool installation, repair, cleaning and maintenance services.  Select here to register.

Corporation Tax Returns
Name Type
CT-1120 2014 Connecticut Corporation Business Tax Instructions
CT-1120 2014 Corporation Business Tax Return
CT-1120A Corporation Business Tax Return Apportionment Computation (with instructions)
CT-1120 ATT Corporation Business Tax Return Attachment Schedules H, I, and J (with instructions)
CT-1120AB Add Back and Exceptions to Add Back of Interest and Intangible Expenses
CT-1120K Business Tax Credit Summary
CT-1120I Computation of Interest Due on Underpayment of Estimated Tax (with instructions)
CT-1120X Amended Corporation Business Tax Return
CT-1120X Amended Corporation Business Tax Return Instructions

OTHER CORPORATION TAX FORMS

AU-796  Reinstatement Guarantee Declaration for Non-stock Corporations 
AU-797 Dissolution Guarantee Declaration for Stock Corporations
AU-800a Withdrawal Guarantee Declaration for Corporations
AU-801 Reinstatement Guarantee Declaration for Stock Corporations
CT-1120A-A Corporation Business Tax Return Apportionment Computation-Air Carriers
CT-1120 A-BMC Corporation Business Tax Return Apportionment Computation - Motor Bus and Motor Carrier Companies
CT-1120 A-BPE Corporation Business Tax Return Apportionment Computation - Broadcasters and Production Entities
CT-1120 A-CCA Corporation Business Tax Return Apportionment Computation of Income from Credit Card Activities
CT-1120 A-FS Corporation Business Tax Return Apportionment Computation of Income from Financial Service Companies Activities
CT-1120 A-IRIC Corporation Business Tax Return Apportionment Computation of Income from Services to Regulated Investment Companies
CT-1120 A-LP Corporation Business Tax Return Apportionment of Limited Partnership Interests
CT-1120 A-MFG Corporation Business Tax Return Apportionment Computation - Manufacturing Companies
CT-1120 A-SBC Corporation Business Tax Return Apportionment Computation - Securities Brokerage Services
CT-1120 CC Authorization and Consent to be Included in a Combined Corporation Business Tax Return
CT-1120 CC-R Revocation of Election and Consent to File Combined Corporation Business Tax
CT-1120 CR Combined Corporation Business Tax Return
CT-1120 CR Combined Corporation Business Tax Return Instructions
CT-1120 PIC Information Return for Passive Investment Companies
CT-1120 U Unitary Corporation Business Tax Return
CT-1120 U Unitary Corporation Business Tax Return Instructions

CREDIT FORMS

CT-1120 DA  Digital Animation Tax Credit  
CT-1120 DL  Donation of Land Credit 
CT-1120 EDPC  Electronic Data Processing Equipment Property Tax Credit 
CT-1120 FCIC Fixed Capital Investment Credit 
CT-1120FP  Film Production Tax Credit 
CT-1120 FPI  Film Production Infrastructure Tax Credit 
CT-1120 GB  Green Building Tax Credit 
CT-1120 HCIC  Human Capital Investment Credit 
CT-1120 HH  Historic Homes Rehabilitation Tax Credit 
CT-1120 HP  Historic Preservation Tax Credit 
CT-1120 HPC  Housing Program Contribution Credit 
CT-1120 HR  Historic Rehabilitation Tax Credit
CT-1120 HS  Historic Structures Rehabilitation Tax Credit 
CT-IRF  Insurance Reinvestment Fund Credit 
CT-1120 MEC  Machinery and Equipment Expenditure Credit 
CT-1120 NJC  New Jobs Creation Credit 
CT-1120 RC  Research and Experimental Expenditures Credit 
CT-1120 RDC  Research and Development Credit 
CT-1120 SBA  Small Business Guaranty Fee Tax Credit 
CT-1120SF  Service Facility Credit 
CT-1120 TIC-EZ  Manufacturing Facility Credit for Facilities Located in a Targeted Investment Community/Enterprise Zone NOTE: This form replaces Forms CT-1120CRMC, CT-1120CRMCEZ, CT-1120MC and CT-1120MCEZ 
CT-1120 XCH  Application for Exchange of Research and Development or Research and Experimental Expenditures Tax Credits by a Qualified Small Business
CT-1120 JET  2014 Job Expansion Tax Credit