Connecticut Corporation Business Tax Extension Form
Form CT-1120 EXT is a vital document for Connecticut corporations seeking an extension to file their business tax return. It allows business owners to request extra time and provides clear instructions on electronic filing, deadlines, and payment obligations. Ensure timely submission to avoid penalties.
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How do I fill this out?
To fill out Form CT-1120 EXT, begin by entering your corporation's details including the Connecticut Tax Registration Number and Federal Employer ID Number. Next, indicate the income year and the requested extension date. Finally, calculate the tentative tax amounts and verify all entries before submission.

How to fill out the Connecticut Corporation Business Tax Extension Form?
1
Enter your corporation's identifying details.
2
Specify the income year and extension request date.
3
Calculate tentative tax using the provided lines.
4
Ensure all information is accurate and complete.
5
Submit the form electronically by the due date.
Who needs the Connecticut Corporation Business Tax Extension Form?
1
Corporations in Connecticut that need extra time to file their tax returns.
2
Business owners who have submitted a federal extension request.
3
Companies experiencing unforeseen delays in tax preparing.
4
New corporations unfamiliar with initial filing processes.
5
Filing groups on behalf of combined unitary corporation members.
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What are the instructions for submitting this form?
To submit Form CT-1120 EXT, you can file it electronically through the myconneCT portal or mail it to the Department of Revenue Services, State of Connecticut. For requests with payment, send to PO Box 2974, Hartford CT 06104-2974. Make sure to check your entries for accuracy and include the correct fee if submitting by mail.
What are the important dates for this form in 2024 and 2025?
The due date for filing Form CT-1120 EXT for calendar year 2021 is May 15, 2022. Corporations with a fiscal year ending June 30 may have extended deadlines. The 2022 income tax returns will be due on May 15, 2023.

What is the purpose of this form?
The purpose of Form CT-1120 EXT is to ensure that Connecticut corporations can request an extension for filing their Corporation Business Tax Returns. By submitting this form, businesses are allowed additional time to accurately prepare their filings without incurring penalties. It is essential for compliance with state tax laws and for proper tax management.

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

- 1. Corporation/Designated Taxable Member Name: The name of the corporation or the designated member filing on behalf of the unitary group.
- 2. Connecticut Tax Registration Number: The state identification number assigned to the corporation.
- 3. Federal Employer ID Number: The unique number assigned by the IRS for federal tax purposes.
- 4. Tentative Amount of Tax Due: Total tax amount calculated for the income year.
- 5. Extension Request Date: The date until which the corporation is requesting an extension to file.
What happens if I fail to submit this form?
Failing to submit Form CT-1120 EXT may lead to significant penalties and interest on unpaid tax amounts. It also may restrict the corporation's ability to manage its tax obligations effectively. Therefore, timely submission is essential.
- Penalties: Late submissions can incur a penalty of 10% on the tax owed.
- Interest Accumulation: Interest on underpaid taxes is charged at 1% per month until settled.
- Tax Filing Issues: Failure to file may lead to complications in filing accurate tax returns later.
How do I know when to use this form?

- 1. Extension Requests: Corporations requesting an extension to their tax filing due to timing issues.
- 2. Federal Extension: When a federal extension is applied for, a state extension request is commonly necessary.
- 3. New Corporations: Newly established businesses requiring additional time to navigate tax responsibilities.
Frequently Asked Questions
What is Form CT-1120 EXT?
Form CT-1120 EXT is the Application for Extension of Time to File the Connecticut Corporation Business Tax Return.
Who needs to file this form?
Corporations in Connecticut seeking additional time to complete their tax filings need to file this form.
How do I submit Form CT-1120 EXT?
You can submit the form electronically using myconneCT or through traditional mail to the Department of Revenue Services.
What happens if I miss the deadline?
Missing the deadline may result in penalties and interest charges on any unpaid tax amount.
Can I amend this form after submission?
If you need to amend the information, file a new form as soon as possible.
Is it necessary to provide a reason for the extension?
A reason is not required if a federal extension has been filed.
What payment options are available?
You can pay by direct payment, credit card, or debit card when filing online.
How do I check the status of my extension?
You can check your tax account status after processing through myconneCT.
What if I have overpaid my tax?
Overpayments can be credited toward future tax obligations for the next fiscal year.
Where can I get help with the form?
Contact the Department of Revenue Services for guidance or visit their official website.
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