Go. Tax Forms and Other Information Check the latest information for the current Tax Year. To make sure the information is accurate, please check with your local agency. View and Print your Connecticut State Income Tax Return. Connecticut does not have a state income tax, but taxes individuals. This tax form will help you figure a tax based on tax information from past years. Form W 9 CT Tax Form (PDF) (2017) See the most current information for your current city, town, or county. You need to add your information to this website periodically to keep up to date. Frequently Asked Questions. See the Most Frequently Asked Questions. Download the Application for an ITIN (Application) or Form SS-4 (W-4) for employers (for individuals) for more questions. Frequently Asked Questions. This website provides tax forms and other information that is important for our residents to keep as current as possible. Click a question to get an answer. Find out where you should start your search for a new address when moving to Stamford Connecticut. This information should help you make a decision. The Connecticut Department of Labor and Industry. The Connecticut Department of Labor and Industry Departmental Bulletin Number 7.9.05 (2017) (PDF) Departmental Bulletin Number 7.9.17 (2017) (PDF) Departmental Bulletin Number 7.9.18 (2017) (PDF) Departmental Bulletin Number 7.9.19 (2017) (PDF) Departmental Bulletin Number 7.9.20 (2017) (PDF) Departmental Bulletin Number 7.9.