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General Instructions

The Connecticut Department of Revenue Services (DRS) requires that you file for an extension if you cannot file your Connecticut income tax by April 15, 2015.

Exception: If you expect to owe no additional Connecticut income tax for the 2014 taxable year, after taking into account any Connecticut income tax withheld from your wages or any estimated Connecticut income tax payments you have made, or both, and you have requested an extension of time to file your 2014 federal income tax return, you are not required to file Form CT-1040 EXT. The Department of Revenue Services will automatically grant you a six-month extension of time to file your 2014 Connecticut income tax return. If you did not request an extension of time to file your federal income tax return, but you are requesting an extension of time to file your Connecticut income tax return, you must file Form CT-1040 EXT whether or not you owe additional Connecticut income tax.

An extension to file your return is not an extension of time to pay your taxes.

If you owe taxes, payment must be made by April 15, 2015 or penalty and interest will be assessed. If you cannot meet the filing deadline, you should apply for an extension. The extension allows additional time to complete and file your income tax return; however, the extension does not provide additional time to pay the amount of tax owed.

Find out if you owe using the DRS tax calculator. The tax calculator allows you to figure your tax by using your filing status and taxable income amount.

Pay your taxes online at the DRS Taxpayer Service Center (TSC). This option is only available if you also file Form CT-1040 EXT through the TSC. You can file your return any time before the due date and designate the amount of payment and date of transfer. Your bank account will be debited on the date you indicate. You must pay the balance due on or before April 15, 2015 to avoid penalty and interest.

You can also pay online at Official Payments Corporation. Visa, MasterCard, Discover Network, and American Express credit and debit cards, and other forms of payment, such as Bill Me Later® are accepted. To make a debit card payment you can use a MasterCard or Visa Debit Card or any debit card with Nyce, Pulse or Star logos. Do not mail Form CT-1040 EXT to the Department of Revenue Services.

There is a convenience fee for this service which is paid directly to the company. The amount of the fee is based on the amount of your payment.

Pay your taxes by phone by calling Official Payments toll-free at 1-800-272-9829. This automated service is available 24 hours, 7 days a week. At the end of your call you will be given a confirmation number. Save this as proof of payment for your records.

There is a convenience fee for this service which is paid directly to the company. The amount of the fee is based on the amount of your payment.

Along with the extension form, send a check in the amount of the estimated tax due made payable to Commissioner of Revenue Services. Write “2013 CT-1040 EXT†and your Social Security number (optional) on the front of your payment. Paper clip it to the front of your return.

If you are sending a payment with this request, mail to:
Department of Revenue Services
PO Box 2977
Hartford, CT 06104-2977

If you are not sending a payment with your request, mail to:
Department of Revenue Services
PO Box 2976
Hartford, CT 06104-2976

Do not mail this return if you do not owe any tax and you have requested a federal extension.

In general, interest and penalty apply to any portion of the tax not paid on or before the original due date of the return. Interest is computed on the underpayment of tax at 1% per month or fraction of a month computed from the original due date to the date of payment.

  • Late Payment Penalty: The penalty for underpayment of tax is 10% of the tax that is not paid on or before the original due date of the return.
  • Late Filing Penalty: If no tax is due, DRS may impose a $50 penalty for the late filing of any return or report that is required by law to be filed.

The Connecticut Department of Revenue requires that you file for an extension even if you do not owe Connecticut taxes or are expecting a refund. Connecticut requires that you request an extension of time to file or you may be subject to a $50 late filing penalty.

For more information, visit the Connecticut Department of Revenue Services.