The Connecticut Earned Income Tax Credit (or CT EITC) is a refundable state income tax credit for low to moderate income working individuals and families. The state credit mirrors the federal Earned Income Tax Credit.
Per the State of Connecticut, you are to use the employer's state identification number from form W-2 or Form 1099.
For more information, please see CT-1040 Instructions. Information related to your question is found on page 35, under Line 6 - Column A and Column B.
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