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Prior Year's Corporation Forms

Instructions
Name Description Revised Date
CT-1120
2024 Connecticut Corporation Business Tax Instructions 12/2024
Business Tax Returns
Name Description Revised Date
CT-1120 2024 Corporation Business Tax Return 12/2024
CT-1120A Corporation Business Tax Return Apportionment Computation (with instructions) 12/2024
CT-1120 ATT Corporation Business Tax Return Attachment Schedules H, I, and J (with instructions) 12/2024
CT-1120AB Add Back and Exceptions to Add Back of Interest and Intangible Expenses 12/2016
CT-1120K Business Tax Credit Summary 12/2024
CT-1120I Computation of Interest Due on Underpayment of Estimated Tax (with instructions) 12/2024
CT-1120 EXT Application for Extension of Time to File Corporation Business Tax Return (with instructions) 12/2024
CT-1120 ES 2025 Estimated Corporation Business Tax Payment Coupons 12/2024
CT-1120 ES 2024 Estimated Corporation Business Tax Payment Coupons 12/2023
CT-1120 CU INSTRUCTIONS 2024 Combined Unitary Corporation Business Tax Instructions 12/2024
CT-1120 CU 2024 Combined Unitary Corporation Business Tax Return 12/2024
CT-1120A-CU 2024 Apportionment Computation for Combined Unitary Filers 12/2024
CT-1120CU-NI 2024 Tax on Combined Group Net Income 12/2024
CT-1120CU-MTB 2024 Tax on Combined Group Minimum Tax Base 12/2024
CT-1120CU-MI 2024 Combined Group Member Information 12/2024
CT-1120CU-NCB 2024 Nexus Combined Base Tax Calculation 12/2024
CT-DTLD Statement of Net Deferred Tax Liability Deduction 12/2024
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 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-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-YDOC Youth Development Organization Contribution Tax Credit NEW
CT-1120 AAC ABLE Account Contribution Tax Credit NEW
CT-1120AT Apprenticeship Training Tax Credit 12/2024
CT-1120ATP Accredited Theater Production Tax Credit NEW
CT-1120 DA
Digital Animation Tax Credit
12/2024
CT-1120 DL
Donation of Land Credit
12/2024
CT-1120 EDPC
Electronic Data Processing Equipment Property Tax Credit
12/2024
CT-1120 FCIC
Fixed Capital Investment Credit
12/2024
CT-1120 FP
Film Production Tax Credit
12/2024
CT-1120 FPI
Film Production Infrastructure Tax Credit
12/2024
CT-1120 GB Green Building Tax Credit 12/2024
CT-1120 HCIC

Human Capital Investment Credit
CORRECTION ALERT
01/2025
CT-1120 HH Historic Homes Rehabilitation Tax Credit 12/2024
CT-1120 HP Historic Preservation Tax Credit 12/2024
CT-1120 HPC Housing Program Contribution Credit 12/2024
CT-1120 HR Historic Rehabilitation Tax Credit 12/2024
CT-1120 HS Historic Structures Rehabilitation Tax Credit 12/2024
CT-IRF Insurance Reinvestment Fund Credit 12/2024
CT-1120 MEC Machinery and Equipment Expenditure Credit 12/2024
CT-1120 PE Pass-Through Entity Tax Credit 12/2024
CT-1120 RC Research and Experimental Expenditures Credit 12/2024
CT-1120 RDC Research and Development Credit 12/2024
CT-RSLP Application for Refund of Student Loan Payment Tax Credits by a Qualified Small Business 12/2024
CT-1120 SF Service Facility Credit 12/2024
Form CT-2025 SLP
 Application for Student Loan Payment Tax Credit 02/2025
CT-SLP Student Loan Payment Tax Credit 12/2024
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
12/2024
CT-UISR Urban and Industrial Site Reinvestment Credit 12/2024
CT-1120 XCH Application for Exchange of Research and Development or Research and Experimental 12/2024
NAA-01 2025 Connecticut Neighborhood Assistance Act (NAA) Program Proposal -Fillable 02/2025