Corporation Tax Forms
Booklet
| Name | Description | Revised Date | Due Date |
| CT-1120 | 2019 Connecticut Corporation Business Tax Instructions | 12/2019 | N/A |
Business Tax Returns
| Name | Description | Revised Date | Due Date |
| CT-1120 | 2019 Corporation Business Tax Return | 12/2019 | |
| CT-1120A | Corporation Business Tax Return Apportionment Computation (with instructions) | 12/2019 | |
| CT-1120ATT | Corporation Business Tax Return Attachment Schedules H, I, and J (with instructions) | 12/2019 | |
| CT-1120AB | Add Back and Exceptions to Add Back of Interest and Intangible Expenses | 12/2016 | |
| CT-1120K | Business Tax Credit Summary | 12/2019 | |
| CT-1120I | Computation of Interest Due on Underpayment of Estimated Tax (with instructions) | 12/2019 | |
| CT-1120 EXT | Application for Extension of Time to File Corporation Business Tax Return (with instructions) | 12/2019 | |
| CT-1120 ES | 2020 Estimated Corporation Business Tax Payment Coupons | 12/2019 | |
| CT-1120 ES | 2019 Estimated Corporation Business Tax Payment Coupons | 12/2017 | |
| CT-1120X | Amended Corporation Business Tax Return | 12/2019 | |
| CT-1120X Inst. | Amended Corporation Business Tax Return Instructions | 12/2019 | N/A |
| CT-NAICS | NAICS Codes for Principal Business Activity for Connecticut Tax Purposes | 05/2004 | N/A |
| CT-1120 CU BOOKLET | 2019 Combined Unitary Corporation Business Tax Booklet | 12/2019 | |
| CT-1120 CU | 2019 Combined Unitary Corporation Business Tax Return | 12/2019 | |
| CT-1120A-CU | 2019 Apportionment Computation for Combined Unitary Filers | 12/2019 | |
| CT-1120CU-NI | 2019 Tax on Combined Group Net Income | 12/2019 | |
| CT-1120CU-MTB | 2019 Tax on Combined Group Minimum Tax Base | 12/2019 | |
| CT-1120CU-MI | 2019 Combined Group Member Information | 12/2019 | |
| CT-1120CU-NCB | 2019 Nexus Combined Base Tax Calculation | 12/2019 |
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 | 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 | 12/2019 |
Credit Forms
| Name | Description | Revised Date | Due Date |
| CT-1120 AT | Apprenticeship Training Tax Credit | 12/2019 | |
| CT-1120 DA | Digital Animation Tax Credit | 12/2019 | N/A |
| CT-1120 DL | Donation of Land Credit | 12/2019 | |
| CT-1120 EDPC | Electronic Data Processing Equipment Property Tax Credit | 12/2019 | |
| CT-1120 FCIC | Fixed Capital Investment Credit | 12/2019 | |
| CT-1120FP | Film Production Tax Credit | 12/2019 | |
| CT-1120 FPI | Film Production Infrastructure Tax Credit | 12/2019 | |
| CT-1120 GB | Green Building Tax Credit | 12/2019 | |
| CT-1120 HCIC | Human Capital Investment Credit | 12/2019 | |
| CT-1120 HH | Historic Homes Rehabilitation Tax Credit | 12/2019 | |
| CT-1120 HP | Historic Preservation Tax Credit | 12/2019 | |
| CT-1120 HPC | Housing Program Contribution Credit | 12/2019 | |
| CT-1120 HR | Historic Rehabilitation Tax Credit | 12/2019 | |
| CT-1120 HS | Historic Structures Rehabilitation Tax Credit | 12/2019 | |
| CT-IRF | Insurance Reinvestment Fund Credit | 12/2019 | |
| CT-1120 MEC | Machinery and Equipment Expenditure Credit | 12/2019 | |
| CT-1120 PE | Pass-Through Entity Tax Credit | 12/2019 | |
| CT-1120 RC | Research and Experimental Expenditures Credit | 12/2019 | |
| CT-1120 RDC | Research and Development Credit | 12/2019 | |
| CT-1120SF | Service Facility Credit | 12/2019 | |
| 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 | 12/2019 | |
| CT-UISR | Urban and Industrial Site Reinvestment Credit | 12/2019 | |
| CT-1120 XCH | Application for Exchange of Research and Development or Research and Experimental | 12/2019 | |
| NAA-01 | 2020 Connecticut Neighborhood Assistance Act (NAA) Program Proposal -Fillable | 02/2020 | |
| NAA-02 | 2020 Connecticut Neighborhood Assistance Act Business Application -Fillable | 05/2020 |