TaxFormFinder
Connecticut Amended Corporation Business Tax Return
Extracted from PDF file 2021-connecticut-form-ct-1120x.pdf, last modified December 2020Amended Corporation Business Tax Return
2020 Form CT-1120X Department of Revenue Services State of Connecticut (Rev. 12/20) 1120X 1220W 01 9999 Amended Connecticut Corporation Business Tax Return Complete this form in blue or black ink only. Do not use staples. See instructions. For Income Year Beginning Corporation name 2020 and Ending M M - D D - Y Y Y Y M M - D D - Y Y Y Y Connecticut Tax Registration Number Mailing address (number and street) Federal Employer ID Number (FEIN) City, town, or post office State ZIP code Check and Complete All Applicable Boxes Is this return currently under Connecticut audit? Yes No Reason for amended return (Check one): IRS adjustments or federal Form 1120X. Attach a copy of IRS notification or federal Form 1120X. Enter date of final determination: Connecticut corporation business tax credits Other: Specify M M - D D - Y Y Y Y Schedule A – Computation of Tax on Net Income Connecticut apportionment change A. Original amount or as previously adjusted 1. Net income from Schedule D, Line 24. If 100% Connecticut, also enter on Line 3. ...................... 1. 2. Apportionment fraction: Carry to six places. See instructions. ................................................. 2. Connecticut net operating loss B. Net change increase C. Correct amount or (decrease) .00 . . . 3. Connecticut net income: Multiply Line 1 by Line 2. .......................................3. .00 4. Operating loss carryover from Form CT‑1120 ATT, Schedule H, Line 21, Column E. Do not exceed 50% of Line 3. ............................. 4. .00 5. Income subject to tax: Subtract Line 4 from Line 3. ......................................5. .00 6. Tax: Multiply Line 5 by 7.5% (.075). ................... 6. .00 .00 Schedule B – Computation of Minimum Tax on Capital 1. Minimum tax base from Form CT‑1120, Schedule E, Line 6, Column C. If 100% Connecticut, also enter on Line 3. .................. 1. 2. Apportionment fraction: Carry to six places. See instructions. ................................................. 2. . . . .00 3. Multiply Line 1 by Line 2. .................................... 3. 4. Number of months covered by this return ........... 4. 5. Multiply Line 3 by Line 4, divide the result by 12. ... 5. .00 6. Tax (3 and 1/10 mills per dollar): Multiply Line 5 by .0031. Maximum tax for Schedule B is $1,000,000.................................... 6. .00 Continue on Page 2. Taxpayers must sign declaration on Page 4. Form CT-1120X Page 2 of 4 (Rev. 12/20) 1120X 1220W 02 9999 CT Tax Registration Number Schedule C – Computation of Amount Payable A. Original amount or as previously adjusted B. Net change increase C. Correct amount or (decrease) 1a. Tax: Greater of Schedule A, Line 6; Schedule B, Line 6; or minimum tax. ............... 1a. .00 1b. Enter the amount of surtax due: See instructions. ............................................... 1b. .00 1c. Recapture of tax credits: See instructions. ....... 1c. .00 1. Total tax: Enter the total of Lines 1a through 1c. If no tax credits claimed, enter also on Line 6. ... 1. .00 2. Multiply Line 1 by 49.99% (0.4999). ................. 2. .00 3. Enter the greater of Line 2 or $250. ................. 3. .00 4. Tax credit limitation: Subtract Line 3 from Line 1. ... 4. .00 5. Tax credits from Form CT‑1120K, Part II, Line 9. Do not exceed amount on Line 4. ........ 5. .00 6. Balance of tax payable: Subtract Line 5 from Line 1. ............................. 6. . .00 7. PE credit from Form CT‑1120PE, Line 3. ........ 7. .00 8. Balance of tax payable: Subtract Line 7 from Line 6, but not less than zero (“0”). .......... 8. .00 9a. Paid with application for extension from Form CT‑1120 EXT. ......................................... 9a. .00 9b. Paid with estimates from Forms CT‑1120 ESA, ESB, ESC, and ESD. ................ 9b. .00 9c. Overpayment from prior year. .......................... 9c. .00 9d. Tax paid with original return plus additional tax paid after original return was filed. ............. 9d. .00 9. Tax payments: Enter the total of Lines 9a through 9d. ...................................... 9. .00 10. Overpayment on original return or as last adjusted. .............................................................................................. 10. .00 11. Net payments to date: Subtract Line 10 from Line 9. ............................................................................................. 11. .00 12a. Amount to be credited to estimated tax: If Line 11 is greater than Line 8, enter amount to be credited to estimated tax. ......................................................................................................................................................... 12a. .00 12b. Amount to be refunded: If Line 11 is greater than Line 8, enter amount to be refunded. ....................................... 12b. .00 13. Tax due: If Line 8 is greater than Line 11, enter amount of tax due. ....................................................................... 13. .00 14. Interest: See instructions. ....................................................................................................................................... 14. .00 15. Balance due: Add Line 13 and Line 14. ................................................................................................................ 15. Continue on Page 3. Taxpayers must sign declaration on Page 4. .00 Form CT-1120X Page 3 of 4 (Rev. 12/20) 1120X 1220W 03 9999 CT Tax Registration Number Schedule D – Computation of Net Income 1. Federal taxable income (loss) before net operating loss and special deductions. A. Original amount or as previously adjusted B. Net change increase C. Correct amount or (decrease) 1. .00 2. Interest income wholly exempt from federal tax. 2. .00 3. Unallowable deduction for corporation tax from Forms CT‑1120, Schedule F, Line 8. 3. .00 4. Interest expenses paid to a related member from Form CT‑1120AB, Part I A, Line 1. 4. .00 5. Intangible expenses and costs paid to a related member from Form CT‑1120AB, Part I B, Line 3. 5. .00 6. Federal bonus depreciation: See instructions. 6. .00 7. Business interest expense carried forward under IRC § 163(j) and deducted for federal tax purposes in the current year. See instructions. 7. .00 8. 80% of IRC § 179 deduction: See instructions. 8. .00 9. Other: Attach explanation. 9. .00 10. Total: Add Lines 1 through 9. 10. .00 11. Dividend deduction from Form CT‑1120 ATT, Schedule I, Line 5. 11. .00 12. Capital loss carryover (if not deducted in computing federal capital gain). 12. .00 13. Capital gain from sale of preserved land. 13. .00 14. Federal bonus depreciation recovery from Form CT‑1120 ATT, Schedule J, Line 26. 14. .00 15. Exceptions to interest add back from Form CT‑1120AB, Part II A, Line 1. 15. .00 16. Exceptions to interest add back from Form CT‑1120AB, Part II A, Line 2. 16. .00 17. Exceptions to interest add back from Form CT‑1120AB, Part II A, Line 3. 17. .00 18. Exceptions to add back of intangible expenses paid to a related member from Form CT‑1120AB, Part II B, Line 1. 18. .00 19. 25% of IRC § 179 deduction added back in the preceding two years. 19. .00 20. IRC § 163(j) business interest deduction disallowed for federal tax purposes. See instructions. 20. .00 21. Contributions from Connecticut or its municipalities included in Schedule D, Line 1. 21. .00 22. Other: See instructions. 22. .00 23. Total: Add Lines 11 through 22. 23. .00 24. Net income: Subtract Line 23 from Line 10. Enter here and on Schedule A, Line 1. 24. .00 Continue on Page 4. Taxpayers must sign declaration on Page 4. Form CT-1120X Page 4 of 4 (Rev. 12/20) 1120X 1220W 04 9999 CT Tax Registration Number Explain any changes below. Show any computation in detail. Attach additional schedules, if necessary. If amending to claim a tax credit, attach Form CT‑1120K, Business Tax Credit Summary. Schedule or Line Number Explanation for change Mail return with payment to: Department of Revenue Services PO Box 2974, Hartford CT 06104-2974 Mail return without payment to: Department of Revenue Services PO Box 150406, Hartford CT 06115-0406 Make check payable to: Commissioner of Revenue Services Attach check to return with paper clip. Do not staple. Declaration: I declare under penalty of law that I have examined this return (including any accompanying schedules and statements) and, to the best of my knowledge and belief, it is true, complete, and correct. I understand that 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) Title Corporate officer’s signature Sign Here Telephone number Date (MMDDYYYY) Corporate officer’s email address (print) Keep a copy of this return Paid preparer’s name (print) for your records. Paid preparer’s signature Preparer’s SSN or PTIN Firm’s FEIN Date (MMDDYYYY) Telephone number Firm’s name, address, and ZIP code 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 DRS.
Form CT-1120X
More about the Connecticut Form CT-1120X Corporate Income Tax
We last updated the Amended Corporation Business Tax Return in April 2022, and the latest form we have available is for tax year 2021. This means that we don't yet have the updated form for the current tax year. Please check this page regularly, as we will post the updated form as soon as it is released by the Connecticut Department of Revenue Services. You can print other Connecticut tax forms here.
eFile your Connecticut tax return now 
eFiling is easier, faster, and safer than filling out paper tax forms. File your Connecticut and Federal tax returns online with TurboTax in minutes. FREE for simple returns, with discounts available for TaxFormFinder users!
File Now with TurboTaxOther Connecticut Corporate Income Tax Forms:
TaxFormFinder has an additional 85 Connecticut income tax forms that you may need, plus all federal income tax forms.
| Form Code | Form Name |
|---|---|
| Form CT-NAICS | NAICS Codes for Principal Business Activity for Company |
| Form AU-796 | Reinstatement Guarantee Declaration for Non-Stock Corporations |
| Form AU-797 | Dissolution Guarantee Declaration for Stock Corporations |
| Form AU-798 | Dissolution Guarantee Declaration for Non-stock Corporations |
| Form AU-800a | Withdrawal Guarantee Declaration for Corporations |
View all 86 Connecticut Income Tax Forms
Form Sources:
Connecticut usually releases forms for the current tax year between January and April. We last updated Connecticut Form CT-1120X from the Department of Revenue Services in April 2022.
About the Corporate Income Tax
The IRS and most states require corporations to file an income tax return, with the exact filing requirements depending on the type of company.
Sole proprietorships or disregarded entities like LLCs are filed on Schedule C (or the state equivalent) of the owner's personal income tax return, flow-through entities like S Corporations or Partnerships are generally required to file an informational return equivilent to the IRS Form 1120S or Form 1065, and full corporations must file the equivalent of federal Form 1120 (and, unlike flow-through corporations, are often subject to a corporate tax liability).
Additional forms are available for a wide variety of specific entities and transactions including fiduciaries, nonprofits, and companies involved in other specific types of business.
Historical Past-Year Versions of Connecticut Form CT-1120X
We have a total of ten past-year versions of Form CT-1120X in the TaxFormFinder archives, including for the previous tax year. Download past year versions of this tax form as PDFs here:
2016 Form CT-1120X
CT-1120X, 2016 Amended Connecticut Corporation Business Tax Return
2015 Form CT-1120X
CT-1120X, 2015 Amended Corporation Business Tax Return
2014 Form CT-1120X
CT-1120X, 2014 Amended Corporation Business Tax Return
2013 Form CT-1120X
CT-1120X, 2013 Amended Corporation Business Tax Return
2012 Form CT-1120X
CT-1120X, 2012 Amended Corporation Business Tax Return
2011 Form CT-1120X
Form CT-1120X, 2011 Amended Corporation Business Tax Return
TaxFormFinder Disclaimer:
While we do our best to keep our list of Connecticut Income Tax Forms up to date and complete, we cannot be held liable for errors or omissions. Is the form on this page out-of-date or not working? Please let us know and we will fix it ASAP.