Connecticut Department of Revenue Services

Forms on our list

Forms without a link have no guide yet. The official copy is on the agency website.

• Form CT-1040Connecticut Resident Income Tax ReturnPersonal income tax
• Form CT-1040NR/PYConnecticut Nonresident and Part-Year Resident Income Tax ReturnPersonal income tax
• Form CT-1040XAmended Connecticut Income Tax Return for IndividualsPersonal income tax
• Form CT-1040ESEstimated Connecticut Income Tax Payment Coupon for IndividualsPersonal income tax
• Form CT-1040 EXTApplication for Extension of Time to File Connecticut Income Tax Return for IndividualsPersonal income tax
• Form CT-1040VConnecticut Electronic Filing Payment VoucherPersonal income tax
• Form CT-2210Underpayment of Estimated Income Tax by Individuals, Trusts, and EstatesPersonal income tax
• Schedule CT-EITCConnecticut Earned Income Tax CreditPersonal income tax
• Schedule CT-IT CreditIncome Tax Credit SummaryPersonal income tax
• Schedule CT-PEPass-Through Entity Tax CreditPersonal income tax
• Schedule CT-CHETConnecticut Higher Education Trust (CHET) 529 Contribution DeductionPersonal income tax
• Schedule CT-DependentConnecticut Dependent Information SchedulePersonal income tax
• Form CT-6251Connecticut Alternative Minimum Tax Return — IndividualsPersonal income tax
• Form CT-8801Credit for Prior Year Connecticut Minimum Tax for Individuals, Trusts, and EstatesPersonal income tax
• Form CT-1040 AWPart-Year Resident Income Allocation WorksheetPersonal income tax
• Form CT-1040 CRCClaim of Right CreditPersonal income tax
• Form CT-1040 FAFiduciary Adjustment AllocationPersonal income tax
• Form CT-8379Nonobligated Spouse ClaimPersonal income tax
• Form CT-1120Corporation Business Tax ReturnBusiness and corporate tax
• Form CT-1120CUCombined Unitary Corporation Business Tax ReturnBusiness and corporate tax
• Form CT-1120XAmended Corporation Business Tax ReturnBusiness and corporate tax
• Form CT-1120 ESA/ESB/ESC/ESDEstimated Corporation Business Tax Payment CouponsBusiness and corporate tax
• Form CT-1120 EXTApplication for Extension of Time to File Corporation Business Tax ReturnBusiness and corporate tax
• Form CT-1120IComputation of Interest Due on Underpayment of Estimated TaxBusiness and corporate tax
• Form CT-1120ACorporation Business Tax Return Apportionment ComputationBusiness and corporate tax
• Form CT-1120 ATTCorporation Business Tax Return Attachment (Schedules H, I, and J)Business and corporate tax
• Form CT-1120KBusiness Tax Credit SummaryBusiness and corporate tax
• Form CT-1120 RDCResearch and Experimental Expenditures Tax CreditBusiness and corporate tax
• Form CT-1120RCResearch and Development Expenditures Tax CreditBusiness and corporate tax
• Form CT-1065/CT-1120SIConnecticut Pass-Through Entity Tax Return (Partnerships and S Corporations)Business and corporate tax
• Schedule CT K-1Member's Share of Certain Connecticut ItemsBusiness and corporate tax
• Form CT-1065/CT-1120SI ESEstimated Connecticut Pass-Through Entity Tax Payment CouponBusiness and corporate tax
• Form CT-1065/CT-1120SI EXTApplication for Extension of Time to File Connecticut Pass-Through Entity Tax ReturnBusiness and corporate tax
• Form CT-2210PEUnderpayment of Estimated Income Tax by Pass-Through EntitiesBusiness and corporate tax
• Form CT-1041Connecticut Income Tax Return for Trusts and EstatesEstates, trusts and inheritance
• Schedule CT-1041 K-1Beneficiary's Share of Certain Connecticut ItemsEstates, trusts and inheritance
• Form CT-1041 ESEstimated Connecticut Income Tax Payment Coupon for Trusts and EstatesEstates, trusts and inheritance
• Form CT-1041 EXTApplication for Extension of Time to File Connecticut Income Tax Return for Trusts and EstatesEstates, trusts and inheritance
• Form CT-1041VConnecticut Fiduciary Electronic Filing Payment VoucherEstates, trusts and inheritance
• Form CT-706/709Connecticut Estate and Gift Tax ReturnEstates, trusts and inheritance
• Form CT-706 NTConnecticut Estate Tax Return (for Nontaxable Estates)Estates, trusts and inheritance
• Form CT-706/709 EXTApplication for Estate and Gift Tax Return Filing Extension and Payment ExtensionEstates, trusts and inheritance
• Form CT-W4Employee's Withholding CertificatePayroll and social security
• Form CT-W4PWithholding Certificate for Pension or Annuity PaymentsPayroll and social security
• Form CT-W4NAEmployee's Withholding Certificate — Nonresident ApportionmentPayroll and social security
• Form CT-941Connecticut Quarterly Reconciliation of WithholdingPayroll and social security
• Form CT-W3Connecticut Annual Reconciliation of WithholdingPayroll and social security
• Form CT-1096Connecticut Annual Summary and Transmittal of Information ReturnsPayroll and social security
• Form CT-945Connecticut Annual Reconciliation of Withholding for Nonpayroll AmountsPayroll and social security
• Form OS-114Connecticut Sales and Use Tax ReturnVAT and sales tax
• Form OP-186Connecticut Individual Use Tax ReturnVAT and sales tax
• CERT-100Materials, Tools, and Fuel Exemption CertificateVAT and sales tax
• CERT-101Machinery, Component Parts, and Replacement and Repair Parts Exemption CertificateVAT and sales tax
• CERT-119Purchases of Tangible Personal Property and Services by Qualifying Exempt OrganizationsVAT and sales tax
• Form OP-210Room Occupancy Tax ReturnVAT and sales tax
• Form AU-463Motor Vehicle and Vessel Individual Use Tax ReturnVAT and sales tax
• Form CT-227Petroleum Products Gross Earnings Tax ReturnVAT and sales tax
• Form REG-1Business Taxes Registration ApplicationRegistration, representation and benefits
• Form LGL-001Power of AttorneyRegistration, representation and benefits
• Form LGL-002Request for Disclosure of Tax Return or Tax Return InformationRegistration, representation and benefits
• Form AU-722Application for a Tax Clearance CertificateRegistration, representation and benefits
• Form DRS-PWRequest for Waiver of Civil PenaltiesRegistration, representation and benefits
• Form CN-1Offer of CompromiseExcise, customs and cross-border
• Form O-MFMotor Vehicle Fuels Tax ReturnExcise, customs and cross-border
• Form IFTA-100 (CT)Connecticut IFTA Quarterly Fuel Use Tax ReturnExcise, customs and cross-border
• Form CT-15Monthly Tax Stamp and Cigarette ReportExcise, customs and cross-border
• Form OP-300Tobacco Products Tax ReturnExcise, customs and cross-border
• Form O-255Alcoholic Beverages Tax ReturnExcise, customs and cross-border

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