Connecticut Application for Extension of Time to File Connecticut Corporation Tax Return

Application for Extension of Time to File Connecticut Corporation Tax Return
Form CT-1120 EXT
Form CT-1120 EXT

Department of Revenue Services
State of Connecticut
(Rev. 12/23)
1120EXT 1223W 01 9999
Enter Income Year Beginning 	

Application for Extension of Time to File
Connecticut Corporation Business Tax Return

		
2023

and Ending 

M M - D D - Y Y Y Y

M M - D D - Y Y Y Y

Corporation/Designated Taxable Member name		

Connecticut Tax Registration Number

This return MUST be filed electronically!

Number and street	



PO Box		

Federal Employer ID Number (FEIN)

DO NOT MAIL paper tax return to DRS.

City, town, or post office	

State	

2023



ZIP code

Request for extension to file Form CT‑1120, Corporation Business Tax Return or Form CT‑1120CU, Combined Unitary Corporation Business
Tax Return. Each corporation must submit payment of any tax due or believed to be due with this application for an extension of time to file, whether
or not an application for federal extension has been approved. See instructions.

I request an extension of time to November 15, 2024, to file my Connecticut Corporation Business Tax return for calendar year 2023,
or until	

(MM-DD-YYYY) for fiscal year ending 	

(MM-DD-YYYY).

June 30 year end filers may request a seven-month extension. All others may request a six‑month extension.
	
	

A federal extension has been requested on federal Form 7004, Application for Automatic Extension of Time to File Certain Business Income
Check
here

(MM-DD-YYYY) and

Tax, Information, and Other Returns, for calendar year 2023 or fiscal year beginning 	

(MM-DD-YYYY). If a federal extension has not been filed, explain why you are requesting the Connecticut

ending		
extension:

Are you filing Form CT‑1120CU?	Yes	No
	 1.	 Tentative amount of tax due for this income year; minimum tax $250. See instructions. ........................ 1.	.00
	 2.	 Surtax: See instructions. .......................................................................................................................... 2.	.00
	 3.	 Total tax: Add Line 1 and Line 2. Include tax credit recapture, if applicable. ........................................... 3.	.00
	 4.	 Multiply Line 3 by 49.99% (0.4999) See instructions. .............................................................................. 4.	

.00

	 5.	 Multiply the number of taxable members included by $250. .................................................................... 5.	

.00

	 6.	 Enter the greater of Line 4 or Line 5. ....................................................................................................... 6.	.00
.00

	 7.	 Tax credit limitation: Subtract Line 6 from Line 3. .................................................................................... 7.	

	 8.	 Tax credits: Do not exceed amount on Line 7. ..................................................................................... 8.	.00
	 9.	 Balance of tax payable: Subtract Line 8 from Line 3. .............................................................................. 9.	.00
	10.	 PE credit: See instructions. .................................................................................................................... 10.	.00

	11.	 Balance of tax payable: Subtract Line 10 from Line 9, but not less than zero (“0”). ...............................11.	.00
	12.	 Payment(s) of estimated tax. ................................................................................................................. 12.	.00
	13.	 Overpayment from prior year. ................................................................................................................ 13.	.00

	14.	 Total payments: Add Line 12 and Line 13. .......................................................................................... 14.	.00
	15.	 Amount due with this return: Subtract Line 14 from Line 11. .......................................................  15.	.00
Declaration: I declare under the penalty of law that I have examined this return and, to the best of my knowledge and belief, it is true, complete, and correct.
I understand the penalty for willfully delivering a false return or document to the Department of Revenue Services (DRS) is a fine of not more than $5,000, imprisonment
for not more than five years, or both. The declaration of a paid preparer other than the taxpayer is based on all information of which the preparer has any knowledge.
Corporate officer’s name (print)	
Corporate officer’s signature	Date (MM-DD-YYYY)

Sign
Here

This return MUST be filed	

Title	

electronically!

Telephone number

DO NOT MAIL paper tax	 return to DRS.

Keep a
copy of Paid preparer’s name (print)	
this return
for your
records. Firm’s name and address	

Paid preparer’s signature	

May DRS contact the preparer
shown below about this return?

Date (MM-DD-YYYY)	
Firm’s FEIN	

Visit us at portal.ct.gov/DRS for more information.

Yes	No

Preparer’s SSN or PTIN
Telephone number

Department of Revenue Services
State of Connecticut

Form CT-1120 EXT Instructions

Use Form CT‑1120 EXT, Application for Extension of Time to
File Connecticut Corporation Business Tax Return, to request a
six‑month extension (seven-month extension for corporations
with a June 30 fiscal year end) to file Form CT‑1120,
Corporation Business Tax Return, or Form CT‑1120CU,
Combined Unitary Corporation Business Tax Return. It is not
necessary to include a reason for the Connecticut extension
request if an extension on federal Form 7004, Application for
Automatic Extension of Time to File Certain Business Income
Tax, Information, and Other Returns, was filed with the Internal
Revenue Service.
If federal Form 7004 was not filed, the corporation may apply
for an extension to file the Connecticut Corporation Business
Tax return if there is reasonable cause for the request.

Filing and Paying Electronically

To get a Connecticut filing extension, the corporation
MUST:
•	 Complete Form CT‑1120 EXT in its entirety;
•	 File it on or before the fifteenth day of the month following
the due date of the corporation’s corresponding federal
income tax return for the income year (May 15 for calendar
year taxpayers); and
•	 Pay the amount shown on Line 15.
Form CT‑1120 EXT extends only the time to file the Connecticut
Corporation Business Tax return. Form CT‑1120 EXT does not
extend the time to pay the amount of tax due.

File and pay Form CT-1120  EXT electronically using
myconneCT. DRS myconneCT allows
taxpayers to electronically file, pay and
manage state tax responsibilities.
If you file Form CT-1120  EXT using myconneCT at
portal.ct.gov/DRS-myconneCT, you must make an
electronic payment at that time. After logging into myconneCT,
find your tax account on the Summary screen, select the File
an Extension link, choose your payment method, and file
Form CT-1120 EXT.
•		Pay by Direct Payment: Using this option authorizes
DRS to electronically withdraw a payment from your bank
account (checking or savings) on a date you select up to
the due date.
•		Pay by Credit Card or Debit Card: You may elect to pay
your tax liability using a credit card (American Express®,
Discover®, MasterCard®, VISA®) or comparable debit card.
A convenience fee will be charged by the credit card service
provider. You will be informed of the amount of the fee and
may elect to cancel the transaction. Your payment will be
effective on the date that you make the charge.
At the end of the transaction, you will receive a confirmation
number for your records. Tax not paid on or before the due date
will be subject to penalty and interest.

When to File Form CT-1120 EXT

Filing and Paying by Mail

Form CT‑1120  EXT is due on or before the fifteenth day
of the month following the due date of the corporation’s
corresponding federal income tax return for the income year
(May 15 for calendar year taxpayers).
If the due date falls on a Saturday, Sunday, or legal holiday,
the return is considered timely if filed on the next business
day.

Electronic Filing and Payment Requirements

Form CT‑1120 and Form CT‑1120CU must be filed and paid
electronically, and all corporations must file and pay their
estimated taxes (Forms CT‑1120 ESA, ESB, ESC and ESD)
and extension requests (Form CT‑1120 EXT) electronically.
To request a waiver from the electronic filing requirement
visit portal.ct.gov/DRS and complete Form DRS‑EWVR,
Electronic Filing and Payment Waiver Request.
The following graduated penalty amounts will apply if you fail
to remit payments electronically:
•	 First offense – 10% penalty on the amount of the tax
payment, but not more than $2,500;
•	 Second offense – 10% penalty, but not more than $10,000;
and
•	 Third and subsequent offenses – 10% penalty.
When initiating a payment through your financial institution’s
online banking system you must verify that your financial
institution is sending an EFT, not a check.

Form CT-1120 EXT Instructions (Rev. 12/23)	

If you file by mail, complete this return in blue or black ink
only. Do not use staples.
Please note that each form is year specific. To prevent any
delay in processing your return, the correct year’s form must
be submitted to the Department of Revenue Services (DRS).
If you have received a waiver from the electronic payment
requirement, make your check payable to Commissioner
of Revenue Services. To ensure payment is applied to
your account, write “2023 Form CT‑1120 EXT” and the
corporation’s Connecticut Tax Registration Number on the
front of the check. Be sure to sign your check and paper clip
it to the front of your return. Do not send cash. DRS may
submit your check to your bank electronically.
Mail paper return with payment to:
Department of Revenue Services
State of Connecticut
PO Box 2974
Hartford CT 06104-2974.
Mail paper return without payment to:
Department of Revenue Services
State of Connecticut
PO Box 150406
Hartford CT 06115-0406.

Interest and Penalty

Interest is assessed at 1% per month or fraction of a month
on any underpayment of tax computed from the due date
of the return. The penalty for underpayment of tax is 10%
Page 1 of 2

of the tax due or $50, whichever is greater. If no tax is due,
the Commissioner of Revenue Services may impose a $50
penalty for the late filing of any return or report that is required
by law to be filed.
If a request for a filing extension has been granted, a
corporation may avoid a penalty for failure to pay the full
amount due by the original due date if it pays:
•	 At least 90% of the tax shown to be due on the return on
or before the original due date of the return; and
•	 The balance due with the filing of Form CT‑1120, or Form
CT‑1120CU on or before the extended due date.

Credit Against Estimated Payments

For groups filing their first Form CT‑1120CU in 2023, the group
will select a Designated Taxable Member when it files its Form
CT‑1120CU. If the parent company does not have nexus in
Connecticut, any other member with nexus may be selected
as the Designated Taxable Member. If a payment is made
by a member other than the Designated Taxable Member, it
will be treated as made by the Designated Taxable Member
when the combined unitary return is filed. Any extension of
time to file approved for any member of the group will be a
valid extension of time to file for all members of the group.

Signature

An officer of the corporation must sign this form.

An overpayment of tax liability for 2023 will be applied
against the first installment of estimated tax due in 2024 if
the taxpayer timely files a completed Form CT-1120 or Form
CT-1120CU and elects to apply an overpayment from 2023
against its 2024 estimated tax.

Paid Preparer Signature

Limit on Credits
The amount of tax credits allowable against the Corporation
Business Tax for any income year may not exceed 50.01%
of the tax due prior to the application of the tax credits.
Research and Development and Research and Experimental
Expenditures tax credits that remain after the application of
the 50.01% limitation may be further used, provided that the
total of all tax credits used shall not exceed 70% of the tax
liability.
Each taxable member included in Form CT-1120CU applies
tax credits on a separate company basis, which are then
aggregated and applied against the combined unitary tax
liability.
See Special Notice 2016(1), Combined Unitary Legislation,
for more information on tax credit usage by members of a
unitary group.
No tax credit allowed against the Corporation Business Tax
shall reduce a company’s minimum tax to an amount less
than $250.

Others Who May Sign
Anyone (including attorneys, accountants, and enrolled
agents) with a signed Power of Attorney may sign for the
corporation in place of a corporate officer.

Tax Credit Recapture
If the corporation is subject to recapture of tax credits, include
the tax credit recapture amount in the total tax for the current
income year.

Surtax

Companies whose gross income equals or exceeds $100
million or who file as part of a combined unitary return must
pay a surtax of 10% of the tax without regard to credits
and tax credit recapture. The surtax does not apply to the
minimum tax of $250.
Special Instructions - Combined Unitary Tentative
Corporation Business Tax Return
The Designated Taxable Member should file one Form
CT‑1120  EXT on behalf of all members of the combined
unitary group included in Form CT‑1120CU.
All payments should be made under the Designated Taxable
Member’s Connecticut Tax Registration Number.

Form CT-1120 EXT Instructions (Rev. 12/23)	

A paid preparer must sign and date Form CT‑1120  EXT.
Paid preparers must also enter their Social Security Number
(SSN) or Preparer Tax Identification Number (PTIN) and their
firm’s FEIN in the spaces provided.

Line Instructions

Line 1 - Enter the tax due for the current income year
without regard to surtax or recapture. Combined unitary filers
aggregate each taxable member’s tax and enter the total.
Line 2 - Enter the surtax amount due.
Form CT-1120 filers: If Line 1 is $250, enter zero (“0”).
Otherwise, if gross income (from federal Form 1120, Line 11,
amount in box at the top of Form CT‑1120) is $100 million or
more, multiply Line 1 by 10% and enter the result.
Form CT‑1120CU filers: Each taxable member included
in Form CT‑1120CU computes its surtax on a separate
company basis. For any taxable member whose tax exceeds
$250, multiply the tax by 10% and enter the total of the surtax
amounts.
Line 3 - Add Line 1 and Line 2. Include tax credit recapture,
if applicable.
Line 4 - Multiply Line 3 by 49.99% (0.4999).
If a corporation has Research and Development or Research
and Experimental Expenditures tax credits that remain after
the application of the 50.01% limitation, these credits may
be further applied, provided the total of all tax credits used
does not exceed 70% of a corporation’s tax liability.
Line 5 - Form CT‑1120 filers, enter $250. Form CT‑1120CU
filers, multiply the number of taxable members included in
the return by $250 and enter the result.
Line 10 - Enter the amount of Pass-Through Entity (PE) tax
credit that will be reported on Form CT‑1120PE, Pass‑Through
Entity Tax Credit. Combined Unitary filers may aggregate
the PE credit available to each member. Do not exceed the
balance of tax payable reported on Line 9.

Page 2 of 2