Connecticut State Department of Revenue Services

Walk-in services at all DRS branch office locations remain suspended. Email DRS at drs@po.state.ct.us. Email the Priority One Taxpayer Assistance Program: DRSPriorityOne_CollectionsAssist@po.state.ct.us. Please check our Frequently Asked Questions page.

2016 Corporation Tax Returns

Booklets

 

Name

Description

Revised
Date

Due
Date

CT-1120

2016 Connecticut Corporation Business Tax Instruction Booklet
12/2016

N/A

Business Tax Returns

Name

Description

Revised
Date

Due
Date

CT-1120

2016 Corporation Business Tax Return

12/2016

CT-1120A

Corporation Business Tax Return Apportionment Computation (with instructions)

12/2016

CT-1120 ATT

Corporation Business Tax Return Attachment Schedules H, I, and J (with instructions)

12/2016

CT-1120AB

Add Back and Exceptions to Add Back of Interest and Intangible Expenses

12/2016

CT-1120K

Business Tax Credit Summary

12/2016

CT-1120I

Computation of Interest Due on Underpayment of Estimated Tax (with instructions)

12/2016

CT-1120 EXT

Application for Extension of Time to File Corporation Business Tax Return (with instructions)

12/2016

CT-1120 ES

2017 Estimated Corporation Business Tax Payment Coupons

12/2016

CT-1120 ES

2016 Estimated Corporation Business Tax Payment Coupons

12/2015

CT-1120X

Amended Corporation Business Tax Return

12/2016

CT-1120X - Inst

Amended Corporation Business Tax Return (Instructions)

12/2016

N/A

CT-NAICS

NAICS Codes for Principal Business Activity for Connecticut Tax Purposes

05/2004

N/A

CT-1120 CU BOOKLET

2016 Combined Unitary Corporation Business Tax Booklet

01/2017

CT-1120 CU ALERT

Alert Regarding Instructions to Form CT-1120CU-NI, Part III, Line 7 Gains Adjustment
10/24/17

CT-1120 CU - NEW

2016 Combined Unitary Corporation Business Tax Return

01/2017

CT-1120A-CU - NEW

2016 Apportionment Computation for Combined Unitary Filers

01/2017

CT-1120CU-NI - NEW

2016 Tax on Combined Group Net Income

01/2017

CT-1120CU-MTB - NEW

2016 Tax on Combined Group Minimum Tax Base

01/2017

CT-1120CU-MI - NEW

2016 Combined Group Member Information

01/2017

CT-1120CU-NCB - NEW

2016 Nexus Combined Base Tax Calculation

01/2017

CT-DTLD- NEW

Statement of Net Deferred Tax Liability Deduction

03/2017

07/03/2017

Other Corporation Forms

Name

Description

Revised
Date

Due
Date

AU-796

Reinstatement Guarantee Declaration for Non-stock Corporations

03/2008

N/A

AU-797

Dissolution Guarantee Declaration for Stock Corporations

04/2008

AU-798

Dissolution Guarantee Declaration for Non-stock Corporations

03/2008

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

03/2017

CT-1120 A-BMC

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

12/2016

CT-1120 A-BPE

Corporation Business Tax Return Apportionment Computation - Broadcasters and Production Entities

12/2016

CT-8822C

Corporation Business Tax Change of Address

12/2016

N/A

CT-1120 A-CCA

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

12/2016

CT-1120 A-FS

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

12/2016

CT-1120 A-IRIC

Corporation Business Tax Return Apportionment Computation of Income from Services to Regulated Investment Companies

12/2016

CT-1120 A-LP

Corporation Business Tax Return Apportionment of Limited Partnership Interests

12/2016

CT-1120 A-SBC

Corporation Business Tax Return Apportionment Computation - Securities Brokerage Services

12/2016

CT-1120 PIC

Information Return for Passive Investment Companies

01/2014

Credit Forms

Name

Description

Revised
Date

Due
Date

CT-1120 AT

Apprenticeship Training Tax Credit

12/2016

CT-1120 DA

Digital Animation Tax Credit

12/2016

N/A

CT-1120 DL

Donation of Land Credit

12/2016

CT-1120 EDPC

Electronic Data Processing Equipment Property Tax Credit
12/2016

CT-1120 FCIC

Fixed Capital Investment Credit
12/2016

CT-1120FP

Film Production Tax Credit

12/2016

CT-1120 FPI

Film Production Infrastructure Tax Credit
12/2016

CT-1120 GB

Green Building Tax Credit

12/2016

CT-1120 HCIC

Human Capital Investment Credit
12/2016

CT-1120 HH

Historic Homes Rehabilitation Tax Credit

12/2016

CT-1120 HP

Historic Preservation Tax Credit

12/2016

CT-1120 HPC

Housing Program Contribution Credit

12/2016

CT-1120 HR

Historic Rehabilitation Tax Credit

12/2016

CT-1120 HS

Historic Structures Rehabilitation Tax Credit

12/2016

CT-IRF

Insurance Reinvestment Fund Credit

12/2016

CT-1120 MEC

Machinery and Equipment Expenditure Credit
12/2016

CT-1120 NJC

New Jobs Creation Credit

12/2016

CT-1120 RC

Research and Experimental Expenditures Credit

12/2016

CT-1120 RDC

Research and Development Credit

12/2016

CT-1120 SBA

Small Business Guaranty Fee Tax Credit

12/2016

CT-1120SF

Service Facility Credit

12/2016

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

12/2016

CT-UISR

Urban and Industrial Site Reinvestment Credit

12/2016

CT-1120 XCH

Application for Exchange of Research and Development or Research and Experimental

12/2016

NAA-01

2017 Connecticut Neighborhood Assistance Act (NAA) Program Proposal - Fillable

03/2017

NAA-02

2017 Connecticut Neighborhood Assistance Act Business Application - Fillable

03/2017