Sales and Use Tax Form OS-114
Fill out your Connecticut sales and use tax return.
State Business Taxes
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Taxpayer Service Center (TSC) Online Business Help
The TSC online help page provides information about how to file most state tax returns, view balances, and schedule payments.
Agency: Department of Revenue Services -
Corporation Business Tax Information
Detailed information on registration and filing requirements for the corporation business tax.
Agency: Department of Revenue Services -
Guide to Connecticut Business Tax Credits
Business tax credit information for a variety of industries.
Agency: Department of Revenue Services -
Provides business owners information about registering a business, sales and use taxes, exemption certificates, filing and amending sales tax returns, renewing a sales tax permit and closing a business.
Agency: Department of Revenue Services -
A brief description of taxes generally applicable to companies doing business in Connecticut. It is not an all-inclusive list, but contains those taxes of interest to most businesses and, where appropriate, identifies state agencies to contact for additional information.
Agency: Department of Revenue Services -
Business Registration Information
Detailed information about registering a business with the Department of Revenue Services (DRS).
Agency: Department of Revenue Services -
Provides Connecticut businesses information about withholding requirements.
Agency: Department of Revenue Services -
File, Pay, and View Business Account Transactions
Businesses that have a Connecticut Tax Registration Number (CT REG) can use the Taxpayer Service Center ( TSC-BUS ) to file, pay, view tax transactions, and update the business's account information.
Agency: Department of Revenue Services -
Unemployment Insurance Tax Information
Connecticut employers can file unemployment taxes, get necessary forms, and understand benefit payment procedures here.
Agency: Department of Labor
