Connecticut State Department of Revenue Services

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.

2015 Corporation Forms

Booklets

Name Description Revised Date
CT-1120 2015 Connecticut Corporation Business Tax Instructions  01/2016

Business Tax Returns

Name strong>Description Revised
Date
CT-1120 2015 Corporation Business Tax Return 12/2015
CT-1120A Corporation Business Tax Return Apportionment Computation (with instructions)

12/2015
CT-1120 ATT Corporation Business Tax Return Attachment Schedules H, I, and J (with instructions)

12/2015
CT-1120AB Add Back and Exceptions to Add Back of Interest and Intangible Expenses 12/2013
CT-1120K Business Tax Credit Summary 12/2015
CT-1120I Computation of Interest Due on Underpayment of Estimated Tax (with instructions) 12/2015
CT-1120X Amended Corporation Business Tax Return
01/2016
CT-1120X Amended Corporation Business Tax Return (Instructions) 12/2015
Other Corporation Forms
Name Description Revised
Date
AU-796 Reinstatement Guarantee Declaration for Non-stock Corporations 03/2008
AU-797 Dissolution Guarantee Declaration for Stock Corporations 04/2008
AU-800a

Withdrawal Guarantee Declaration for Corporations

03/2008

AU-801

Reinstatement Guarantee Declaration for Stock Corporations

03/2008

CT-1120A-A

Corporation Business Tax Return Apportionment Computation-Air Carriers

12/2008

CT-1120 A-BMC

Corporation Business Tax Return Apportionment Computation - Motor Bus and Motor Carrier Companies

12/2013

CT-1120 A-BPE

Corporation Business Tax Return Apportionment Computation - Broadcasters and Production Entities

12/2013

CT-1120 A-CCA

Corporation Business Tax Return Apportionment Computation of Income from Credit Card Activities

12/2013

CT-1120 A-FS

Corporation Business Tax Return Apportionment Computation of Income from Financial Service Companies Activities

12/2014
CT-1120 A-IRIC Corporation Business Tax Return Apportionment Computation of Income from Services to Regulated Investment Companies 2012
CT-1120 A-LP Corporation Business Tax Return Apportionment of Limited Partnership Interests 01/2011

CT-1120 A-MFG

Corporation Business Tax Return Apportionment Computation - Manufacturing Companies

12/2014

CT-1120 A-SBC

Corporation Business Tax Return Apportionment Computation - Securities Brokerage Services

2012

CT-1120 CC

Authorization and Consent to be Included in a Combined Corporation Business Tax Return

12/2015

CT-1120 CC-R

Revocation of Election and Consent to File Combined Corporation Business Tax

12/2014

CT-1120 CR

Combined Corporation Business Tax Return

12/2015

CT-1120 CR

Combined Corporation Business Tax Return (Instructions)

12/2015

CT-1120 PIC

Information Return for Passive Investment Companies

01/2014

CT-1120 U

Unitary Corporation Business Tax Return

12/2015
CT-1120 U Unitary Corporation Business Tax Return (Instructions)

Credit Forms

Name

Description

Revised
Date
CT-1120 AT Apprenticeship Training Tax Credit 12/2015
CT-1120 DA Digital Animation Tax Credit 12/2015
CT-1120 DL Donation of Land Credit 12/2015
CT-1120 EDPC Electronic Data Processing Equipment Property Tax Credit
12/2015
CT-1120 FCIC Fixed Capital Investment Credit
12/2015
CT-1120FP Film Production Tax Credit

12/2015
CT-1120 FPI Film Production Infrastructure Tax Credit
12/2015
CT-1120 GB Green Building Tax Credit

11/2015
CT-1120 HCIC Human Capital Investment Credit
12/2015
CT-1120 HH Historic Homes Rehabilitation Tax Credit

11/2015
CT-1120 HP Historic Preservation Tax Credit

12/2015
CT-1120 HPC Housing Program Contribution Credit

12/2015
CT-1120 HR Historic Rehabilitation Tax Credit

11/2015
CT-1120 HS Historic Structures Rehabilitation Tax Credit

12/2015
CT-IRF Insurance Reinvestment Fund Credit

11/2015
CT-1120 MEC Machinery and Equipment Expenditure Credit

12/2015
CT-1120 NJC New Jobs Creation Credit

11/2015
CT-1120 RC Research and Experimental Expenditures Credit

11/2015
CT-1120 RDC Research and Development Credit

11/2015
CT-1120 SBA Small Business Guaranty Fee Tax Credit 11/2015
CT-1120SF Service Facility Credit 11/2015
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-UISR Urban and Industrial Site Reinvestment Credit 12/2015
CT-1120 XCH Application for Exchange of Research and Development or Research and Experimental 12/2015
CT-1120 JET 2015 Job Expansion Tax Credit 12/2015