The Department of Revenue Services will be closed on Monday, July 4, 2022, a state holiday.


Child Tax Rebate - A new child tax rebate was recently authorized by the Connecticut General Assembly. The Department of Revenue Services to hold Live Virtual Event about the 2022 Child Tax Rebate on July 7, 2022, Click here to learn more.

Gas Tax - For updated information on the Suspension of the Motor Fuels Tax click here

Sales tax relief for sellers of meals: - Click here for updated information

myconneCT - Learn more about myconneCT

Current Corporation Tax Forms

Prior Year's Corporation Forms

Booklet

Name Description Revised Date Due Date
CT-1120
  2021 Connecticut Corporation Business Tax Instructions 12/2021 N/A 

Business Tax Returns

Name Description Revised Date Due Date
CT-1120 2021 Corporation Business Tax Return 12/2021
CT-1120A Corporation Business Tax Return Apportionment Computation (with instructions) 12/2021
CT-1120 ATT Corporation Business Tax Return Attachment Schedules H, I, and J (with instructions) 12/2021
CT-1120AB Add Back and Exceptions to Add Back of Interest and Intangible Expenses 12/2016
CT-1120K Business Tax Credit Summary 12/2021
CT-1120I Computation of Interest Due on Underpayment of Estimated Tax (with instructions) 12/2021
CT-1120 EXT Application for Extension of Time to File Corporation Business Tax Return (with instructions) 12/2021
CT-1120 ES 2021 Estimated Corporation Business Tax Payment Coupons 12/2020
CT-1120 ES 2022 Estimated Corporation Business Tax Payment Coupons 12/2021
CT-1120 CU BOOKLET 2021 Combined Unitary Corporation Business Tax Booklet 12/2021
CT-1120 CU 2021 Combined Unitary Corporation Business Tax Return 12/2021
CT-1120A-CU 2021 Apportionment Computation for Combined Unitary Filers 12/2021
CT-1120CU-NI 2021 Tax on Combined Group Net Income 12/2021
CT-1120CU-MTB 2021 Tax on Combined Group Minimum Tax Base 12/2021
CT-1120CU-MI 2021 Combined Group Member Information 12/2021
CT-1120CU-NCB 2021 Nexus Combined Base Tax Calculation 12/2021

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 07/2021
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 01/2018
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 12/2017
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 12/2017
CT-1120 A-SBC Corporation Business Tax Return Apportionment Computation - Securities Brokerage Services 12/2016
CT-1120 PIC Information Return for Passive Investment Companies 12/2018

Credit Forms

Name
Description Revised Date
 CT-1120AT Apprenticeship Training Tax Credit 12/2021
 CT-1120 DA
Digital Animation Tax Credit
12/2021
 CT-1120 DL
Donation of Land Credit
12/2021
 CT-1120 EDPC
Electronic Data Processing Equipment Property Tax Credit
12/2021
 CT-1120 FCIC
Fixed Capital Investment Credit
12/2021
 CT-1120 FP
Film Production Tax Credit
12/2021
 CT-1120 FPI
Film Production Infrastructure Tax Credit
12/2021
 CT-1120 GB Green Building Tax Credit 12/2021
 CT-1120 HCIC Human Capital Investment Credit 12/2021
 CT-1120 HH Historic Homes Rehabilitation Tax Credit 12/2021
 CT-1120 HP Historic Preservation Tax Credit 12/2021
 CT-1120 HPC Housing Program Contribution Credit 12/2021
 CT-1120 HR Historic Rehabilitation Tax Credit 12/2021
 CT-1120 HS Historic Structures Rehabilitation Tax Credit 12/2021
 CT-IRF Insurance Reinvestment Fund Credit 12/2021
 CT-1120 MEC Machinery and Equipment Expenditure Credit 12/2021
 CT-1120 PE Pass-Through Entity Tax Credit 12/2021
 CT-1120 RC Research and Experimental Expenditures Credit 12/2021
 CT-1120 RDC Research and Development Credit 12/2021
 CT-1120 SF Service Facility Credit 12/2021
 CT-1120 TIC-EZ Manufacturing Facility Credit for Facilities Located in a Targeted Investment Community/Enterprise Zone
NOTE: This form replaces Forms CT-1120 CRMC, CT-1120 CRMCEZ, CT-1120 MC and CT-1120 MCEZ
12/2021
 CT-UISR Urban and Industrial Site Reinvestment Credit 12/2021
 CT-1120 XCH Application for Exchange of Research and Development or Research and Experimental 12/2021
 NAA-01 2022 Connecticut Neighborhood Assistance Act (NAA) Program Proposal -Fillable 03/2022