Telephone Numbers: Connecticut Department of Revenue Services (click the Contact Us link at the top of the page). Department of Labor phone directory. Employers may file a UI return reporting no employees via telephone by calling (860) 566-1018 or (203) 248-4270.

Registration as a business in Connecticut. Registers your business for a variety of taxes, including Connecticut income withholding tax.

Employer's Tax Guide. Connecticut Department of Revenue Services. Information about withholding tax, how to register, calendar of duties. (44 pages, Acrobat document, effective 01/01/2004)

Change of address form, Connecticut Department of Revenue Services.

Connecticut UI tax forms available for downloading.

UI information.

An Employer's Guide to Unemployment Compensation. An online guide.

UC-1A Employer Status Report for Unemployment Compensation. Register your business with the Connecticut Department of Labor, Employment Security Division. Non-profits use Form UC-1 NP.

Connecticut Workers' Compensation Commission. Forms and publications, news, general information.