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Connecticut Free Printable Form CT-NAICS, 2001 NAICS Codes for Principal Business Activity for Connecticut Tax Purposes for 2022 Connecticut NAICS Codes for Principal Business Activity for Company

Form CT-NAICS is obsolete, and is no longer supported by the Connecticut Department of Revenue.

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NAICS Codes for Principal Business Activity for Company
Form CT-NAICS, 2001 NAICS Codes for Principal Business Activity for Connecticut Tax Purposes

DEPARTMENT OF REVENUE SERVICES STATE OF CONNECTICUT 25 Sigourney Street Hartford CT 06106-5032 (Rev. 12/01) FORM CT-NAICS NAICS Codes for Principal Business Activity for Connecticut Tax Purposes Select the code that best matches your primary business activity. Listings are arranged by type of industry. Agriculture, Forestry, Fishing and Hunting Crop Production 111100 Oilseed and Grain Farming 111210 Vegetable and Melon Farming (including potatoes & yams) 111300 Fruit and Tree Nut Farming 111400 Greenhouse, Nursery, and Floriculture Production 111900 Other Crop Farming (including tobacco, cotton, sugarcane, hay, peanut, sugar beet & all other crop farming) Animal Production 112111 Beef Cattle Ranching and Farming 112112 Cattle Feedlots 112120 Dairy Cattle and Milk Production 112210 Hog and Pig Farming 112300 Poultry and Egg Production 112400 Sheep and Goat Farming 112510 Animal Aquaculture (including shellfish & finfish farms & hatcheries) 112900 Other Animal Production Forestry and Logging 113110 Timber Tract Operations 113210 Forest Nurseries and Gathering of Forest Products 113310 Logging Fishing, Hunting and Trapping 114110 Fishing 114210 Hunting and Trapping Support Activities For Agriculture and Forestry 115110 Support Activities For Crop Production (including cotton ginning, soil preparation, planting & cultivating) 115210 Support Activities For Animal Production 115310 Support Activities For Forestry Mining 211110 212110 212200 212310 212320 212390 213110 Oil and Gas Extraction Coal Mining Metal Ore Mining Stone Mining and Quarrying Sand, Gravel, Clay, and Ceramic and Refractory Minerals Mining and Quarrying Other Nonmetallic Mineral Mining and Quarrying Support Activities For Mining Utilities 221100 221210 221300 Electric Power Generation, Transmission and Distribution Natural Gas Distribution Water, Sewage and Other Systems Construction Building, Developing, and General Contracting 233110 Land Subdivision and Land Development 233200 Residential Building Construction 233300 Nonresidential Building Construction Heavy Construction 234100 Highway, Street, Bridge, and Tunnel Construction 234900 Other Heavy Construction Special Trade Contractors 235110 Plumbing, Heating, and AirConditioning Contractors 235210 Painting and Wall Covering Contractors 235310 Electrical Contractors 235400 Masonry, Drywall, Insulation, and Tile Contractors 235500 Carpentry and Floor Contractors 235610 Roofing, Siding, and Sheet Metal Contractors 235710 Concrete Contractors 235810 Water Well Drilling Contractors 235900 Other Special Trade Contractors Manufacturing Food Manufacturing 311110 Animal Food Manufacturing 311200 Grain and Oilseed Milling 311300 Sugar and Confectionery Product Manufacturing 311400 Fruit and Vegetable Preserving and Specialty Food Manufacturing 311500 Dairy Product Manufacturing 311610 Animal Slaughtering and Processing 311710 Seafood Product Preparation and Packaging 311800 Bakeries and Tortilla Manufacturing 311900 Other Food Manufacturing (including coffee, tea, flavorings & seasonings) Beverage and Tobacco Product Manufacturing 312110 Soft Drink and Ice Manufacturing 312120 Breweries 312130 Wineries 312140 Distilleries 312200 Tobacco Manufacturing Textile Mills and Textile Product Mills 313000 Textile Mills 314000 Textile Product Mills Apparel Manufacturing 315100 Apparel Knitting Mills 315210 Cut and Sew Apparel Contractors 315220 Men’s and Boys’ Cut and Sew Apparel Manufacturing 315230 Women’s and Girls’ Cut and Sew Apparel Manufacturing 315290 Other Cut and Sew Apparel Manufacturing 315990 Apparel Accessories and Other Apparel Leather and Allied Product Manufacturing 316110 Leather and Hide Tanning and Finishing 316210 Footwear Manufacturing (including rubber & plastics) 316990 Other Leather and Allied Product Manufacturing Wood Product Manufacturing 321110 Sawmills and Wood Preservation 321210 Veneer, Plywood, and Engineered Wood Product Manufacturing 321900 Other Wood Product Manufacturing Paper Manufacturing 322100 Pulp, Paper, and Paperboard Mills 322200 Converted Paper Product Manufacturing Printing and Related Support Activities 323100 Printing and Related Support Activities Petroleum and Coal Products Manufacturing 324110 Petroleum Refineries (including integrated) 324120 Asphalt Paving, Roofing, and Saturated Materials Manufacturing 324190 Other Petroleum and Coal Products Manufacturing Chemical Manufacturing 325100 Basic Chemical Manufacturing 325200 Resin, Synthetic Rubber, and Artificial and Synthetic Fibers and Filaments Manufacturing 325300 Pesticide, Fertilizer, and Other Agricultural Chemical Manufacturing 325410 Pharmaceutical and Medicine Manufacturing 325500 Paint, Coating, and Adhesive Manufacturing 325600 Soap, Cleaning Compound, and Toilet Preparation Manufacturing 325900 Other Chemical Product and Preparation Manufacturing Plastics and Rubber Products Manufacturing 326100 Plastics Product Manufacturing 326200 Rubber Product Manufacturing Nonmetallic Mineral Product Manufacturing 327100 Clay Product and Refractory Manufacturing 327210 Glass and Glass Product Manufacturing 327300 Cement and Concrete Product Manufacturing 327400 Lime and Gypsum Product Manufacturing 327900 Other Nonmetallic Mineral Product Manufacturing Primary Metal Manufacturing 331110 Iron and Steel Mills and Ferroalloy Manufacturing 331200 Steel Product Manufacturing From Purchased Steel Page 1 of 4 331310 331400 331500 Alumina and Aluminum Production and Processing Nonferrous Metal (except aluminum) Production and Processing Foundries Fabricated Metal Product Manufacturing 332110 Forging and Stamping 332210 Cutlery and Handtool Manufacturing 332300 Architectural and Structural Metals Manufacturing 332400 Boiler, Tank, and Shipping Container Manufacturing 332510 Hardware Manufacturing 332610 Spring and Wire Product Manufacturing 332700 Machine Shops; Turned Product; and Screw, Nut, and Bolt Manufacturing 332810 Coating, Engraving, Heat Treating, and Allied Activities 332900 Other Fabricated Metal Product Manufacturing Machinery Manufacturing 333100 Agriculture, Construction, and Mining Machinery Manufacturing 333200 Industrial Machinery Manufacturing 333310 Commercial and Service Industry Machinery Manufacturing 333410 Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing 333510 Metalworking Machinery Manufacturing 333610 Engine, Turbine, and Power Transmission Equipment Manufacturing 333900 Other General Purpose Machinery Manufacturing Computer and Electronic Product Manufacturing 334110 Computer and Peripheral Equipment Manufacturing 334200 Communications Equipment Manufacturing 334310 Audio and Video Equipment Manufacturing 334410 Semiconductor and Other Electronic Component Manufacturing 334500 Navigational, Measuring, Electromedical, and Control Instruments Manufacturing 334610 Manufacturing and Reproducing Magnetic and Optical Media Electrical Equipment, Appliance, and Component Manufacturing 335100 Electric Lighting Equipment Manufacturing 335200 Household Appliance Manufacturing 335310 Electrical Equipment Manufacturing 335900 Other Electrical Equipment and Component Manufacturing Transportation Equipment Manufacturing 336100 Motor Vehicle Manufacturing 336210 Motor Vehicle Body and Trailer Manufacturing 336300 Motor Vehicle Parts Manufacturing 336410 Aerospace Product and Parts Manufacturing 336510 Railroad Rolling Stock Manufacturing 336610 Ship and Boat Building 336990 Other Transportation Equipment Manufacturing Form CT-NAICS (Rev. 12/01) Furniture and Related Product Manufacturing 337000 Furniture and Related Product Manufacturing Miscellaneous Manufacturing 339110 Medical Equipment and Supplies Manufacturing 339900 Other Miscellaneous Manufacturing Wholesale Trade Wholesale Trade, Durable Goods 421100 Motor Vehicle and Motor Vehicle Parts and Supplies Wholesalers 421200 Furniture and Home Furnishing Wholesalers 421300 Lumber and Other Construction Materials Wholesalers 421400 Professional and Commercial Equipment and Supplies Wholesalers 421500 Metal and Mineral (except petroleum) Wholesalers 421600 Electrical Goods Wholesalers 421700 Hardware, and Plumbing and Heating Equipment and Supplies Wholesalers 421800 Machinery, Equipment, and Supplies Wholesalers 421910 Sporting and Recreational Goods and Supplies Wholesalers 421920 Toy and Hobby Goods and Supplies Wholesalers 421930 Recyclable Material Wholesalers 421940 Jewelry, Watch, Precious Stone, and Precious Metal Wholesalers 421990 Other Miscellaneous Durable Goods Wholesalers Wholesale Trade, Nondurable Goods 422100 Paper and Paper Product Wholesalers 422210 Drugs and Druggists’ Sundries Wholesalers 422300 Apparel, Piece Goods, and Notions Wholesalers 422400 Grocery and Related Product Wholesalers 422500 Farm Product Raw Material Wholesalers 422600 Chemical and Allied Products Wholesalers 422700 Petroleum and Petroleum Products Wholesalers 422800 Beer, Wine, and Distilled Alcoholic Beverage Wholesalers 422910 Farm Supplies Wholesalers 422920 Book, Periodical, and Newspaper Wholesalers 422930 Flower, Nursery Stock, and Florists’ Supplies Wholesalers 422940 Tobacco and Tobacco Product Wholesalers 422950 Paint, Varnish, and Supplies Wholesalers 422990 Other Miscellaneous Nondurable Goods Wholesalers Retail Trade Motor Vehicle and Parts Dealers 441110 New Car Dealers 441120 Used Car Dealers 441210 Recreational Vehicle Dealers 441221 Motorcycle Dealers 441222 Boat Dealers 441229 All Other Motor Vehicle Dealers 441300 Automotive Parts, Accessories, and Tire Stores Furniture and Home Furnishings Stores 442110 Furniture Stores 442210 Floor Covering Stores 442291 Window Treatment Stores 442299 All Other Home Furnishings Stores Electronics and Appliance Stores 443111 Household Appliance Stores 443112 Radio, Television, and Other Electronics Stores 443120 Computer and Software Stores 443130 Camera and Photographic Supplies Stores Building Material and Garden Equipment and Supplies Dealers 444110 Home Centers 444120 Paint and Wallpaper Stores 444130 Hardware Stores 444190 Other Building Material Dealers 444200 Lawn and Garden Equipment and Supplies Stores Food and Beverage Stores 445110 Supermarkets and Other Grocery (except convenience) Stores 445120 Convenience Stores 445210 Meat Markets 445220 Fish and Seafood Markets 445230 Fruit and Vegetable Markets 445291 Baked Goods Stores 445292 Confectionery and Nut Stores 445299 All Other Specialty Food Stores 445310 Beer, Wine, and Liquor Stores Health and Personal Care Stores 446110 Pharmacies and Drug Stores 446120 Cosmetics, Beauty Supplies, and Perfume Stores 446130 Optical Goods Stores 446190 Other Health and Personal Care Stores Gasoline Stations 447100 Gasoline Stations (including convenience stores with gas) Clothing and Clothing Accessories Stores 448110 Men’s Clothing Stores 448120 Women’s Clothing Stores 448130 Children’s and Infants’ Clothing Stores 448140 Family Clothing Stores 448150 Clothing Accessories Stores 448190 Other Clothing Stores 448210 Shoe Stores 448310 Jewelry Stores 448320 Luggage and Leather Goods Stores Sporting Stores 451110 451120 451130 451140 451211 451212 451220 Goods, Hobby, Book, and Music Sporting Goods Stores Hobby, Toy, and Game Stores Sewing, Needlework, and Piece Goods Stores Musical Instrument and Supplies Stores Book Stores News Dealers and Newsstands Prerecorded Tape, Compact Disc, and Record Stores General Merchandise Stores 452110 Department Stores 452900 Other General Merchandise Stores Miscellaneous Store Retailers 453110 Florists 453210 Office Supplies and Stationery Stores 453220 Gift, Novelty, and Souvenir Stores Page 2 of 4 453310 453910 453920 453930 453990 Used Merchandise Stores Pet and Pet Supplies Stores Art Dealers Manufactured (Mobile) Home Dealers All Other Miscellaneous Store Retailers (including tobacco, candle & trophy shops) Nonstore Retailers 454110 Electronic Shopping and Mail-Order Houses 454210 Vending Machine Operators 454311 Heating Oil Dealers 454312 Liquefied Petroleum Gas (Bottled Gas) Dealers 454319 Other Fuel Dealers 454390 Other Direct Selling Establishments (including door-to-door retailing, frozen food plan providers, party plan merchandisers, & coffee-break service providers) Transportation and Warehousing Air, Rail and Water Transportation 481000 Air Transportation 482110 Rail Transportation 483000 Water Transportation Truck Transportation 484110 General Freight Trucking, Local 484120 General Freight Trucking, LongDistance 484200 Specialized Freight Trucking Transit and Ground Passenger Transportation 485110 Urban Transit Systems 485210 Interurban and Rural Bus Transportation 485310 Taxi Service 485320 Limousine Service 485410 School and Employee Bus Transportation 485510 Charter Bus Industry 485990 Other Transit and Ground Passenger Transportation Pipeline Transportation 486000 Pipeline Transportation Scenic and Sightseeing Transportation 487000 Scenic and Sightseeing Transportation Support Activities For Transportation 488100 Support Activities For Air Transportation 488210 Support Activities For Rail Transportation 488300 Support Activities For Water Transportation 488410 Motor Vehicle Towing 488490 Other Support Activities For Road Transportation 488510 Freight Transportation Arrangement 488990 Other Support Activities For Transportation Couriers and Messengers 492110 Couriers 492210 Local Messengers and Local Delivery Warehousing and Storage 493100 Warehousing and Storage (except lessors of miniwarehouses & selfstorage units) Form CT-NAICS (Rev. 12/01) Information Publishing Industries 511110 Newspaper Publishers 511120 Periodical Publishers 511130 Book Publishers 511140 Database and Directory Publishers 511190 Other Publishers 511210 Software Publishers Motion Picture and Sound Recording Industries 512100 Motion Picture and Video Industries (except video rental) 512200 Sound Recording Industries Broadcasting and Telecommunications 513100 Radio and Television Broadcasting 513200 Cable Networks and Program Distribution 513300 Telecommunications (including paging, cellular, satellite, & other telecommunications) Information Services and Data Processing Services 514100 Information Services (including news syndicates, libraries, & on-line information services) 514210 Data Processing Services Finance and Insurance Depository Credit Intermediation 522110 Commercial Banking 522120 Savings Institutions 522130 Credit Unions 522190 Other Depository Credit Intermediation Nondepository Credit Intermediation 522210 Credit Card Issuing 522220 Sales Financing 522291 Consumer Lending 522292 Real Estate Credit (including mortgage bankers & originators) 522293 International Trade Financing 522294 Secondary Market Financing 522298 All Other Nondepository Credit Intermediation Activities Related To Credit Intermediation 522300 Activities Related To Credit Intermediation (including loan brokers) Securities, Commodity Contracts, and Other Financial Investments and Related Activities 523110 Investment Banking and Securities Dealing 523120 Securities Brokerage 523130 Commodity Contracts Dealing 523140 Commodity Contracts Brokerage 523210 Securities and Commodity Exchanges 523900 Other Financial Investment Activities (including portfolio management & investment advice) Insurance Carriers and Related Activities 524140 Direct Life, Health, & Medical Insurance & Reinsurance Carriers 524150 Direct Insurance & Reinsurance (except life, health & medical) Carriers 524210 Insurance Agencies and Brokerages 524290 Other Insurance Related Activities Funds, Trusts, and Other Financial Vehicles 525100 Insurance and Employee Benefit Funds 525910 Open-End Investment Funds 525920 Trusts, Estates, and Agency Accounts 525930 Real Estate Investment Trusts 525990 Other Financial Vehicles Real Estate and Rental and Leasing Real Estate 531110 Lessors of Residential Buildings and Dwellings 531120 Lessors of Nonresidential Buildings (except miniwarehouses) 531130 Lessors of Miniwarehouses and SelfStorage Units 531190 Lessors of Other Real Estate Property 531210 Offices of Real Estate Agents and Brokers 531310 Real Estate Property Managers 531320 Offices of Real Estate Appraisers 531390 Other Activities Related To Real Estate Rental and Leasing Services 532100 Automotive Equipment Rental and Leasing 532210 Consumer Electronics and Appliances Rental 532220 Formal Wear and Costume Rental 532230 Video Tape and Disc Rental 532290 Other Consumer Goods Rental 532310 General Rental Centers 532400 Commercial and Industrial Machinery and Equipment Rental and Leasing Lessors of Nonfinancial Intangible Assets (Except Copyrighted Works) 533110 Lessors of Nonfinancial Intangible Assets (except copyrighted works) Professional, Scientific, and Technical Services Legal Services 541110 Offices of Lawyers 541190 Other Legal Services Accounting, Tax Preparation, Bookkeeping, and Payroll Services 541211 Offices of Certified Public Accountants 541213 Tax Preparation Services 541214 Payroll Services 541219 Other Accounting Services Architectural, Engineering, and Related Services 541310 Architectural Services 541320 Landscape Architectural Services 541330 Engineering Services 541340 Drafting Services 541350 Building Inspection Services 541360 Geophysical Surveying and Mapping Services 541370 Surveying and Mapping (except geophysical) Services 541380 Testing Laboratories Specialized Design Services 541400 Specialized Design Services (including interior, industrial, graphic, & fashion design) Page 3 of 4 Computer Systems Design and Related Services 541511 Custom Computer Programming Services 541512 Computer Systems Design Services 541513 Computer Facilities Management Services 541519 Other Computer Related Services Other Professional, Scientific, and Technical Services 541600 Management, Scientific, and Technical Consulting Services 541700 Scientific Research and Development Services 541800 Advertising and Related Services 541910 Marketing Research and Public Opinion Polling 541920 Photographic Services 541930 Translation and Interpretation Services 541940 Veterinary Services 541990 All Other Professional, Scientific, and Technical Services Management of Companies (Holding Companies) 551111 551112 Offices of Bank Holding Companies Offices of Other Holding Companies Administrative and Support and Waste Management and Remediation Services Administrative and Support Services 561110 Office Administrative Services 561210 Facilities Support Services 561300 Employment Services 561410 Document Preparation Services 561420 Telephone Call Centers 561430 Business Service Centers (including private mail centers & copy shops) 561440 Collection Agencies 561450 Credit Bureaus 561490 Other Business Support Services (including repossession services, court reporting, & stenotype services) 561500 Travel Arrangement and Reservation Services 561600 Investigation and Security Services 561710 Exterminating and Pest Control Services 561720 Janitorial Services 561730 Landscaping Services 561740 Carpet and Upholstery Cleaning Services 561790 Other Services To Buildings and Dwellings 561900 Other Support Services (including packaging & labeling services, & convention & trade show organizers) Waste Management and Remediation Services 562000 Waste Management and Remediation Services Educational Services 611000 Educational Services (including schools, colleges, & universities) Form CT-NAICS (Rev. 12/01) Health Care and Social Assistance Accommodation and Food Services Offices of Physicians and Dentists 621111 Offices of Physicians (except mental health specialists) 621112 Offices of Physicians, Mental Health Specialists 621210 Offices of Dentists Accommodation 721110 Hotels (except casino hotels) and Motels 721120 Casino Hotels 721191 Bed-and-Breakfast Inns 721199 All Other Traveler Accommodation 721210 RV (Recreational Vehicle) Parks and Recreational Camps 721310 Rooming and Boarding Houses Offices of Other Health Practitioners 621310 Offices of Chiropractors 621320 Offices of Optometrists 621330 Offices of Mental Health Practitioners (except physicians) 621340 Offices of Physical, Occupational and Speech Therapists, and Audiologists 621391 Offices of Podiatrists 621399 Offices of All Other Miscellaneous Health Practitioners Outpatient Care Centers 621410 Family Planning Centers 621420 Outpatient Mental Health and Substance Abuse Centers 621491 HMO Medical Centers 621492 Kidney Dialysis Centers 621493 Freestanding Ambulatory Surgical and Emergency Centers 621498 All Other Outpatient Care Centers Medical and Diagnostic Laboratories 621510 Medical and Diagnostic Laboratories Home Health Care Services 621610 Home Health Care Services Other Ambulatory Health Care Services 621900 Other Ambulatory Health Care Services (including ambulance services & blood & organ banks) Hospitals 622000 Hospitals Nursing and Residential Care Facilities 623000 Nursing and Residential Care Facilities Social Assistance 624100 Individual and Family Services 624200 Community Food and Housing, and Emergency and Other Relief Services 624310 Vocational Rehabilitation Services 624410 Child Day Care Services Arts, Entertainment, and Recreation Performing Arts, Spectator Sports, and Related Industries 711100 Performing Arts Companies 711210 Spectator Sports (including sports clubs & racetracks) 711300 Promoters of Performing Arts, Sports, and Similar Events 711410 Agents and Managers for Artists, Athletes, Entertainers, and Other Public Figures 711510 Independent Artists, Writers, and Performers Museums, Historical Sites, and Similar Institutions 712100 Museums, Historical Sites, and Similar Institutions Amusement, Gambling, and Recreation Industries 713100 Amusement Parks and Arcades 713200 Gambling Industries 713900 Other Amusement and Recreation Industries (including golf courses, skiing facilities, marinas, fitness centers, & bowling centers) Food Services and Drinking Places 722110 Full-Service Restaurants 722210 Limited-Service Eating Places 722300 Special Food Services (including food service contractors & caterers) 722410 Drinking Places (alcoholic beverages) Other Services Repair and Maintenance 811110 Automotive Mechanical and Electrical Repair and Maintenance 811120 Automotive Body, Paint, Interior, and Glass Repair 811190 Other Automotive Repair and Maintenance (including oil change & lubrication shops & car washes) 811210 Electronic and Precision Equipment Repair and Maintenance 811310 Commercial and Industrial Machinery and Equipment (except automotive and electronic) Repair and Maintenance 811410 Home and Garden Equipment and Appliance Repair and Maintenance 811420 Reupholstery and Furniture Repair 811430 Footwear and Leather Goods Repair 811490 Other Personal and Household Goods Repair and Maintenance Personal and Laundry Services 812111 Barber Shops 812112 Beauty Salons 812113 Nail Salons 812190 Other Personal Care Services (including diet & weight reducing centers) 812210 Funeral Homes and Funeral Services 812220 Cemeteries and Crematories 812310 Coin-Operated Laundries and Drycleaners 812320 Drycleaning and Laundry Services (except coin-operated) 812330 Linen and Uniform Supply 812910 Pet Care (except veterinary) Services 812920 Photofinishing 812930 Parking Lots and Garages 812990 All Other Personal Services Religious, Grantmaking, Civic, Professional, and Similar Organizations 813000 Religious, Grantmaking, Civic, Professional, and Similar Organizations _________________________________________ Public Administration 920000 Public Administration Page 4 of 4
Extracted from PDF file 2021-connecticut-form-ct-naics.pdf, last modified December 2001

More about the Connecticut Form CT-NAICS Corporate Income Tax TY 2021

We last updated the NAICS Codes for Principal Business Activity for Company in April 2022, so this is the latest version of Form CT-NAICS, fully updated for tax year 2021. You can download or print current or past-year PDFs of Form CT-NAICS directly from TaxFormFinder. You can print other Connecticut tax forms here.

Other Connecticut Corporate Income Tax Forms:

TaxFormFinder has an additional 85 Connecticut income tax forms that you may need, plus all federal income tax forms.

Form Code Form Name
Form CT-1120 Instructions Connecticut Corporation Business Tax Instructions
Form CT-1120 EXT Application for Extension of Time to File Connecticut Corporation Tax Return
Form CT-1040BA Nonresident Business Apportionment Schedule
Form CT-1120 A-LP Corporation Business Tax Return Apportionment of Limited Partnership Interests
Form CT-1120 ES Estimated Corporation Business Tax Payment Coupons

Download all CT tax forms View all 86 Connecticut Income Tax Forms


Form Sources:

Connecticut usually releases forms for the current tax year between January and April. We last updated Connecticut Form CT-NAICS from the Department of Revenue Services in April 2022.

Show Sources >

About the Corporate Income Tax

The IRS and most states require corporations to file an income tax return, with the exact filing requirements depending on the type of company.

Sole proprietorships or disregarded entities like LLCs are filed on Schedule C (or the state equivalent) of the owner's personal income tax return, flow-through entities like S Corporations or Partnerships are generally required to file an informational return equivilent to the IRS Form 1120S or Form 1065, and full corporations must file the equivalent of federal Form 1120 (and, unlike flow-through corporations, are often subject to a corporate tax liability).

Additional forms are available for a wide variety of specific entities and transactions including fiduciaries, nonprofits, and companies involved in other specific types of business.

Historical Past-Year Versions of Connecticut Form CT-NAICS

We have a total of nine past-year versions of Form CT-NAICS in the TaxFormFinder archives, including for the previous tax year. Download past year versions of this tax form as PDFs here:


2021 Form CT-NAICS

Form CT-NAICS, 2001 NAICS Codes for Principal Business Activity for Connecticut Tax Purposes

2019 Form CT-NAICS

Form CT-NAICS.pmd

2017 Form CT-NAICS

Form CT-NAICS.pmd

2016 Form CT-NAICS

Form CT-NAICS.pmd

NAICS Codes 2015 Form CT-NAICS

Form CT-NAICS.pmd

NAICS Codes 2014 Form CT-NAICS

Form CT-NAICS.pmd

NAICS Codes 2013 Form CT-NAICS

Form CT-NAICS.pmd

NAICS Codes 2012 Form CT-NAICS

Form CT-NAICS.pmd

NAICS Codes 2011 Form CT-NAICS

Form CT-NAICS.pmd


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