Where Can I Find the CT 1040 Extension Form for Tax Filing?

Filing taxes on time isn’t always possible. If you need extra time to submit your Connecticut state tax return, requesting an extension can help. The Connecticut Department of Revenue Services (DRS) allows taxpayers to extend their filing deadline, but following the correct process is essential.

To file for an extension, you must obtain the correct form, meet submission deadlines, and understand any penalties or payment obligations.

Eligibility Requirements

Not everyone qualifies for an extension, and understanding the criteria can prevent complications. Connecticut residents and part-year residents who expect to owe state income tax must meet specific conditions before requesting additional time. The extension applies only to the filing deadline, not the payment deadline—any outstanding tax liability must still be paid by the original due date to avoid interest charges.

Nonresidents with Connecticut-sourced income, such as wages earned in the state or rental income from a Connecticut property, may also request an extension. Those who have already received a federal extension by filing IRS Form 4868 automatically receive a Connecticut extension, provided they do not owe additional state taxes. If they do owe, they must submit Form CT-1040 EXT with their payment.

Locating the Official Form

The Connecticut Department of Revenue Services provides Form CT-1040 EXT for taxpayers seeking more time to file. The most current version is available on the official DRS website (portal.ct.gov/DRS), where taxpayers can download a PDF and review instructions. Searching “CT-1040 EXT” on the site will direct you to the correct page.

For those who prefer a physical copy, the form is available at some libraries and post offices during tax season. Taxpayers can also request a mailed copy by calling the DRS taxpayer assistance line. While electronic filing is encouraged for faster processing, paper submissions are accepted.

Tax preparation software like TurboTax and H&R Block integrates Connecticut’s extension form, making it easy to complete alongside a federal return. Many tax professionals, including CPAs and enrolled agents, can also assist with obtaining and submitting the form.

Deadlines and Submission

Connecticut taxpayers must submit Form CT-1040 EXT by the standard state income tax due date, typically April 15. If the date falls on a weekend or holiday, the deadline moves to the next business day. Missing this deadline results in the extension request being denied, and the taxpayer may face late filing penalties.

The extension request can be submitted electronically or by mail. The DRS encourages online filing through its Taxpayer Service Center (TSC), which provides immediate confirmation of receipt. Paper submissions must be postmarked by the due date. Using certified mail or a trackable delivery service is recommended to maintain proof of submission.

Payment and Penalties

An extension grants more time to file but does not delay tax payment obligations. Connecticut requires taxpayers to estimate and pay their state income tax liability by the original due date. Failure to do so results in interest charges of 1% per month on the unpaid balance until fully paid.

If at least 90% of the total tax liability is not paid by the original deadline, a late payment penalty of 10% is applied to the outstanding balance. If the return is not filed by the extended deadline, a separate late filing penalty of 10% applies, with a minimum charge of $50. These penalties can add up quickly for those who neither file nor pay on time.

Confirmation of Extension

Taxpayers who file Form CT-1040 EXT electronically through the Taxpayer Service Center receive an immediate confirmation number, which should be saved for reference.

For those who mail a paper form, confirmation is not automatic. Taxpayers can check their account on the DRS website or contact the agency directly to verify receipt. If a payment was included, reviewing bank statements for the transaction can also serve as confirmation. If no confirmation is received, following up with the DRS is recommended to avoid penalties due to processing delays.