CT-1120 EXT Application for Filing Extension
The CT-1120 EXT form is used to request an extension of time to file the Connecticut Corporation Business Tax return. Corporations can apply for a six-month extension (or seven months for June 30 year-end filers) using this form. Proper completion and timely submission are essential to avoid penalties.
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How do I fill this out?
To fill out the CT-1120 EXT form, begin by entering your basic corporation information. Next, calculate your tax liabilities as instructed in the form. Finally, ensure that you electronically submit the completed form and any necessary payments before the due date.

How to fill out the CT-1120 EXT Application for Filing Extension?
1
Gather your corporation details and tax registration number.
2
Complete all sections of the form accurately.
3
Calculate the tentative tax due and any surtaxes.
4
Submit the form electronically before the deadline.
5
Keep a copy of the submitted form for your records.
Who needs the CT-1120 EXT Application for Filing Extension?
1
Corporations seeking additional time to file their Connecticut business tax returns.
2
Accountants preparing tax documents for corporations.
3
Businesses that are under audit and need to extend their filing deadline.
4
Start-ups that may require more time to prepare their financial documentation.
5
Companies with complex financial situations needing additional time for accurate reporting.
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What are the instructions for submitting this form?
To submit the CT-1120 EXT form, you must complete it electronically through the Connecticut Department of Revenue Services portal. Ensure that you have all the required information, including your corporation's tax registration number and Federal Employer ID Number (FEIN). Submit the completed form before the deadline of May 15 to avoid any penalties associated with late submission.
What are the important dates for this form in 2024 and 2025?
For the tax year 2024, the due date for filing Form CT-1120 EXT is May 15, 2024, and for 2025 it is May 15, 2025. Corporations with June 30 fiscal year-ends can request a seven-month extension instead of six, which would fall on December 15. Always ensure timely submission to avoid interest and penalties.

What is the purpose of this form?
The purpose of Form CT-1120 EXT is to provide corporations with a means to request an extension for filing their Corporation Business Tax returns in Connecticut. By submitting this form, corporations can gain additional time to gather necessary documentation and accurately calculate their tax liabilities. This extension helps ensure compliance with tax regulations and prevents penalties associated with late submissions.

Tell me about this form and its components and fields line-by-line.

- 1. Corporation/Designated Taxable Member Name: The official name of the corporation or designated member filing the return.
- 2. Tax Registration Number: The unique tax registration number assigned to the corporation by the state.
- 3. Federal Employer ID Number (FEIN): The employer identification number issued by the IRS for the corporation.
- 4. Tentative Amount of Tax Due: The estimated tax amount that the corporation expects to owe for the current tax year.
- 5. Signature of Corporate Officer: The signature of a corporate officer affirming the accuracy of the submitted information.
What happens if I fail to submit this form?
Failure to submit Form CT-1120 EXT on time may result in penalties and interest on any unpaid taxes. Corporations may also face fines for failure to comply with state tax regulations. It is essential for businesses to meet their filing deadlines to avoid complications.
- Penalties for Late Submission: Late submission can incur hefty fines, which can significantly increase the overall tax liability.
- Interest on Unpaid Taxes: Interest is charged on any tax amount that is underpaid or not submitted by the deadline.
- Impact on Compliance Status: Failure to file may affect the corporation's standing with the state, potentially leading to further audits or liabilities.
How do I know when to use this form?

- 1. Extensions for Filing: Corporations can use this form to request an extension on their tax filing deadlines.
- 2. Special Circumstances: If financial documentation is incomplete or under audit, this form provides a means to prolong the filing period.
- 3. Annual Business Tax Filings: Corporations typically use this form each year to ensure compliance with state tax deadlines.
Frequently Asked Questions
What is the purpose of Form CT-1120 EXT?
Form CT-1120 EXT is used to request an extension of time to file your Connecticut Corporation Business Tax return.
Who needs to submit this form?
Any corporation in Connecticut that requires extra time to file their business tax return should submit this form.
How can I edit my CT-1120 EXT PDF?
You can use the PrintFriendly editor to make changes directly to your CT-1120 EXT PDF before downloading.
How do I submit the CT-1120 EXT form?
The form must be filed electronically via the Connecticut Department of Revenue Services website before the deadline.
What are the penalties for late submission?
Late submissions may incur penalties, including interest on unpaid taxes.
Can I file for a federal extension as well?
Yes, you can file a federal extension on Form 7004 and still request a Connecticut extension using this form.
What is the deadline for filing this form?
The CT-1120 EXT form should be filed by the fifteenth day of the month following the due date of the corresponding federal return.
How do I know if I qualify for the extension?
Any corporation that needs additional time to prepare their business tax return can qualify by filing this form.
Are there any special instructions for combined unitary groups?
Yes, designated taxable members should file this form on behalf of the entire combined unitary group.
Where can I find help if I have questions while filling out the form?
You can visit the Connecticut Department of Revenue Services website for additional information and support.