This document is a Connecticut state tax form for reporting income tax withholding. It contains instructions for completing the form which includes: 1. Reporting the total number of W-2, W-2G and 1099 forms showing Connecticut income tax withholding in section 1. 2. Listing the employer identification numbers from those forms in column A and the amount of Connecticut income tax withheld from each form in column B of section 2. 3. Calculating the total Connecticut income tax withheld by adding the amounts in column B and entering it in section 3 and the relevant line on the Connecticut tax return.