Connecticut — NAICS Codes for Principal Business Activity for Company
More about the Connecticut Form CT-NAICS
We last updated Connecticut Form CT-NAICS in April 2022 from the Connecticut Department of Revenue Services. This form is for income earned in tax year 2025, with tax returns due in April 2026. We will update this page with a new version of the form for 2027 as soon as it is made available by the Connecticut government.
Other Connecticut Corporate Income Tax Forms:
In addition to information about Connecticut's income tax brackets, Tax-Brackets.org provides a total of 86 Connecticut income tax forms, as well as many federal income tax forms. Here's a list of some of the most commonly used Connecticut tax forms:
| Form Code | Form Name |
|---|---|
| Form CT-NAICS | NAICS Codes for Principal Business Activity for Company |
| 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-1120 A-LP | Corporation Business Tax Return Apportionment of Limited Partnership Interests |
| Form CT-1120 | Corporation Business Tax Return |
View all 86 Connecticut Income Tax Forms
Disclaimer: While we do our best to keep Form CT-NAICS up to date and complete on Tax-Brackets.org, we cannot be held liable for errors or omissions. Is this form missing or out-of-date? Please let us know so we can fix it!
Tax Form Sources:
- Connecticut Department of Revenue Services ( http://www.ct.gov/drs/
) - Department of Revenue Services Income Tax Forms ( http://www.ct.gov/drs/cwp/view.asp?a=1555&q=443200&drsPNavCtr=|#42836 )