How to Amend Connecticut Taxes
Making a mistake on your tax return can result in receiving a smaller tax refund than you're owed or paying penalties and interest if the mistake caused you to underpay your taxes. If you discover an error on a previously filed Connecticut tax return, you can file an amended return with the Connecticut Department of Revenue Services. There is no time limit for filing an amended return if you owe additional taxes, but you only have three years to file an amended return that can result in a larger refund.
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Instructions
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1
Download Form CT-1040X from the Connecticut Department of Revenue Services website.
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2
Input the figures of your original tax return in column A of page one.
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3
Provide the corrected figures for the amended return in column C.
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4
Subtract the amount in column A from the amount is column C to calculate the net increase or decrease for each line item. Enter those figures in column B.
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Provide the reasons for filing an amended return in the area provided at the top of page two.
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Make corrections, if necessary, to Schedules 1, 2, 3 and 4 found on pages two and three of the tax return. Schedule 1 is for modifications to your federal adjusted gross income. Schedule 2 is for credits for income taxes paid to other jurisdictions. Schedule 3 is for property tax credits. Schedule 4 is to calculate your individual use tax.
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Mail Form CT-1040X and a copy of your amended federal return, if you are filing one, to the Department of Revenue Services.
Mail to the following address if you are not making a payment:
Department of Revenue Services
State of Connecticut
P.O. Box 2976
Hartford CT 06104-2976
Mail to the following address if you are making a payment:
Department of Revenue Services
State of Connecticut
P.O. Box 2977
Hartford CT 06104-2977
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Tips & Warnings
You will be charged an interest fee of 1 percent per month on any additional amounts not paid by the April 15 tax deadline.
