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.

2005 Corporation Tax Returns

All forms and some DRS publications are in Adobe Acrobat format.  Before viewing or printing these documents you will need Adobe Acrobat Reader 7.0 or higher.   For additional assistance or if you are have trouble downloading a form, visit our Adobe Information page.

Name Type Description
    
File Electronically for FREE!  Use the TSC-BUS

2005 CORPORATION BUSINESS TAX RETURNS

CT-1120 Instruction Booklet 2005 Connecticut Corporation Business Tax Instructions
CT-1120 Form 2005 Corporation Business Tax Return
CT-1120 ATT Form & Inst. 2005 Corporation Business Tax Return Attachment Schedules H, I, and J
CT-1120AB Form 2005 Add Back and Exceptions to Add Back of Interest and Intangible Expenses
CT-1120K Form 2005 Business Tax Credit Summary
CT-1120K Instructions 2005 Business Tax Credit Summary Instructions
CT- 1120I Form & Inst. 2005 Computation of Interest Due on Underpayment of Estimated Tax
CT-1120X Form 2005 Amended Corporation Business Tax Return
CT-1120X Instructions 2005 Amended Corporation Business Tax Return Instructions
CT-NAICS Form NAICS Codes for Principal Business Activity for Connecticut Tax Purposes

OTHER CORPORATION TAX FORMS

CT-1120A Form & Inst. 2005 Corporation Business Tax Return Apportionment Computation
CT-1120A-A Form
2005 Corporation Business Tax Return Apportionment Computation-Air Carriers
CT-1120 A-BMC Form 2005 Corporation Business Tax Return Apportionment Computation - Motor Bus and Motor Carrier Companies
CT-1120 A-BPE Form 2005 Corporation Business Tax Return Apportionment Computation - Broadcasters and Production Entities
CT-1120 A-CCA Form 2005 Corporation Business Tax Return Apportionment Computation of Income From Credit Card Activities
CT-1120 A-FS Form 2005 Corporation Business Tax Return Apportionment Computation of Income from Financial Service Companies Activities
CT-1120 A-IRIC Form 2005 Corporation Business Tax Return Apportionment Computation of Income from Services to Regulated Investment Companies
Form 2005 Corporation Business Tax Return Apportionment of Limited Partnership Interests
CT-1120 A-MFG Form 2005 Corporation Business Tax Return Apportionment Computation - Manufacturing Companies
CT-1120 A-SBC Form 2005 Corporation Business Tax Return Apportionment Computation - Securities Brokerage Services
CT-1120 CC Form 2005 Authorization and Consent to be Included in a Combined Corporation Business Tax Return
Form 2005 Revocation of Election and Consent to File Combined Corporation Business Tax
CT-1120 CR Form
2005 Combined Corporation Business Tax Return
CT-1120 CR Instructions 2005 Combined Corporation Business Tax Return Instructions
CT-1120 PIC Form 2005 Information Return for Passive Investment Companies
CT-1120 Q Form 2005 Connecticut Corporate Unitary Questionnaire
CT-1120 U Form 2005 Unitary Corporation Business Tax Return
CT-1120 U Instructions 2005 Unitary Corporation Business Tax Return Instructions
CORPORATION TAX CREDIT FORMS
CT-1120 AP
Form
 2005 Air Pollution Abatement Facilities Credit
CT-1120 CAF Form 2005 Clean Alternative Fuel - Vehicles, Equipment and Related Filling or Recharging Stations Credit
CT-CDC Form 2005 Computer Donation Credit Application
CT-1120 DEWC Form 2005 Tax Credit for Displaced Workers Hired by Electric Suppliers
ALERT
 Form 2005 Donation of Open Space Land Credit
CT-1120 EAH Form 2005 Employer-Assisted Housing Credit
CT-1120 EDPC Form 2005 Electronic Data Processing Equipment Property Tax Credit
CT-1120 FCIC Form 2005 Fixed Capital Investment Credit
CT-1120 GC Form 2005 Tax Credit for Research and Development Grants to Institutions of Higher Education
CT-1120 HCIC Form 2005 Human Capital Investment Credit
CT-1120 HIC Form 2005 Hiring Incentive Tax Credit NOTE:  This form replaces Form CT-1120OC, Opportunity Certificate Credit effective for the 2002 tax year.
CT-1120 HHR Form 2005 Historic Rehabilitation Credit
CT-1120 HPC 
ALERT
 Form 2005 Housing Program Contribution Credit
CT-IRF Form 2005 Insurance Reinvestment Fund Credit
CT-1120 MEC Form 2005 Machinery and Equipment Expenditure Credit
CT-1120 RC Form 2005 Research and Experimental Expenditures Credit
CT-1120 RDC Form 2005 Research and Development Credit
CT-1120 SBA Form 2005 Small Business Guaranty Fee Tax Credit
CT-1120SF 
ALERT
 Form 2005 Service Facility Credit
CT-1120 TIC/EZ Form 2005 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-1120 UISR Form 2005 Urban and Industrial Site Reinvestment Credit
CT-1120 XCH Form 2005 Application for Exchange of Research and Development or Research and Experimental Expenditures Tax Credits by a Qualified Small Business
NAA-01 Form 2005 Connecticut Neighborhood Assistance Act (NAA) Program Proposal
Form 2005 Connecticut Neighborhood Assistance Act Business Application