IRS Form 1120-X Amended U.S. Corporation Income Tax Return

What Is IRS Form 1120X?

IRS Form 1120X, Amended U.S. Corporation Income Tax Return - also known as the Amended Corporate Tax Return - is a form filed with the Internal Revenue Service (IRS) by corporations in order to correct mistakes made on Form 1120 (or Form 1120-A), a claim for refund, or an examination, and also, to make certain elections after the prescribed deadline. Form 1120X was issued by the IRS and last revised in 2016.

IRS Form 1120-A was the short version of the 1120 and was discontinued after the 2006 tax year. Form 1120X fillable version is available for download through the link below.

Where to Mail IRS Form 1120X?

File this form at the applicable IRS Center where the corporation filed its original return.

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1120X
OMB No. 1545-0123
Amended U.S. Corporation Income Tax Return
For tax year ending
Form
(Rev. November 2016)
Department of the Treasury
Information about Form 1120X and its instructions is at www.irs.gov/form1120x.
(Enter month and year.)
Internal Revenue Service
Employer identification number
Name
Please
Type
Number, street, and room or suite no. If a P.O. box, see instructions.
or
Print
City or town, state, and ZIP code
Telephone number (optional)
Enter name and address used on original return. If same as above, write “Same.”
Internal Revenue Service Center
where original return was filed
Fill in applicable items and use Part II on the back to explain any changes
(a) As originally
(b) Net change —
Income and Deductions (see instructions)
Part I
(c) Correct amount
reported or as
increase or (decrease) —
previously adjusted
explain in Part II
1
Total income .
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1
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Total deductions
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Taxable income. Subtract line 2 from line 1 .
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Total tax .
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Payments and Credits (see instructions)
5a Overpayment in prior year allowed as a credit .
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b Estimated tax payments .
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c Refund applied for on Form 4466 .
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5c
d Subtract line 5c from the sum of lines 5a and 5b .
5d
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e Tax deposited with Form 7004 .
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5e
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Credit from Form 2439
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5f
g Credit for federal tax on fuels and other refundable
credits .
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5g
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Tax deposited or paid with (or after) the filing of the original return .
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7
Add lines 5d through 6, column (c)
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Overpayment, if any, as shown on original return or as later adjusted .
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9
Subtract line 8 from line 7
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9
Tax Due or Overpayment (see instructions)
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Tax due. Subtract line 9 from line 4, column (c). If paying by check, make it payable to the
“United States Treasury” .
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11
Overpayment. Subtract line 4, column (c), from line 9 .
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12
Enter the amount of line 11 you want: Credited to 20
Estimated tax
Refunded
12
Under penalties of perjury, I declare that I have filed an original return and that I have examined this amended return, including accompanying
schedules and statements, and to the best of my knowledge and belief, this amended return is true, correct, and complete. Declaration of preparer
Sign
(other than taxpayer) is based on all information of which preparer has any knowledge.
Here
Signature of officer
Date
Title
Print/Type preparer’s name
Preparer’s signature
Date
PTIN
Paid
Check
if
self-employed
Preparer
Firm’s name
Firm’s EIN
Use Only
Firm’s address
Phone no.
1120X
For Paperwork Reduction Act Notice, see instructions.
Form
(Rev. 11-2016)
Cat. No. 11530Z
1120X
OMB No. 1545-0123
Amended U.S. Corporation Income Tax Return
For tax year ending
Form
(Rev. November 2016)
Department of the Treasury
Information about Form 1120X and its instructions is at www.irs.gov/form1120x.
(Enter month and year.)
Internal Revenue Service
Employer identification number
Name
Please
Type
Number, street, and room or suite no. If a P.O. box, see instructions.
or
Print
City or town, state, and ZIP code
Telephone number (optional)
Enter name and address used on original return. If same as above, write “Same.”
Internal Revenue Service Center
where original return was filed
Fill in applicable items and use Part II on the back to explain any changes
(a) As originally
(b) Net change —
Income and Deductions (see instructions)
Part I
(c) Correct amount
reported or as
increase or (decrease) —
previously adjusted
explain in Part II
1
Total income .
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1
2
2
Total deductions
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3
Taxable income. Subtract line 2 from line 1 .
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3
4
4
Total tax .
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Payments and Credits (see instructions)
5a Overpayment in prior year allowed as a credit .
5a
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b Estimated tax payments .
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5b
c Refund applied for on Form 4466 .
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5c
d Subtract line 5c from the sum of lines 5a and 5b .
5d
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e Tax deposited with Form 7004 .
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5e
f
Credit from Form 2439
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5f
g Credit for federal tax on fuels and other refundable
credits .
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5g
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Tax deposited or paid with (or after) the filing of the original return .
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6
7
Add lines 5d through 6, column (c)
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Overpayment, if any, as shown on original return or as later adjusted .
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9
Subtract line 8 from line 7
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9
Tax Due or Overpayment (see instructions)
10
Tax due. Subtract line 9 from line 4, column (c). If paying by check, make it payable to the
“United States Treasury” .
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11
Overpayment. Subtract line 4, column (c), from line 9 .
11
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12
Enter the amount of line 11 you want: Credited to 20
Estimated tax
Refunded
12
Under penalties of perjury, I declare that I have filed an original return and that I have examined this amended return, including accompanying
schedules and statements, and to the best of my knowledge and belief, this amended return is true, correct, and complete. Declaration of preparer
Sign
(other than taxpayer) is based on all information of which preparer has any knowledge.
Here
Signature of officer
Date
Title
Print/Type preparer’s name
Preparer’s signature
Date
PTIN
Paid
Check
if
self-employed
Preparer
Firm’s name
Firm’s EIN
Use Only
Firm’s address
Phone no.
1120X
For Paperwork Reduction Act Notice, see instructions.
Form
(Rev. 11-2016)
Cat. No. 11530Z
2
Form 1120X (Rev. 11-2016)
Page
Part II
Explanation of Changes to Items in Part I (Enter the line number from Part I for the items you are
changing, and give the reason for each change. Show any computation in detail. Also, see What To Attach
in the instructions.)
If the change is due to a net operating loss carryback, a capital loss carryback, or a general business credit carryback, see
Carryback Claims in the instructions, and check here
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1120X
Form
(Rev. 11-2016)
3
Form 1120X (Rev. 11-2016)
Page
Future Developments
What To Attach
For the latest information about developments related to Form
If the corrected amount involves an item of income, deduction,
1120X and its instructions, such as legislation enacted after they
or credit that must be supported with a schedule, statement, or
were published, go to www.irs.gov/form1120x.
form, attach the appropriate schedule, statement, or form to
Form 1120X. Include the corporation’s name and employer
General Instructions
identification number on any attachments. See the instructions
for the applicable Form 1120 for the tax year of the claim for a
Section references are to the Internal Revenue Code unless
list of forms that may be required.
otherwise noted.
In addition, if the corporation requests that the IRS
Purpose of Form
electronically deposit a refund of $1 million or more, attach
Form 8302, Electronic Deposit of Tax Refund of $1 Million or
Use Form 1120X to:
More.
• Correct a Form 1120 as originally filed, or as later adjusted by
Tax Shelters
an amended return, a claim for refund, or an examination, or
If the corporation’s return is being amended for a tax year in
• Make certain elections after the prescribed deadline (see
which the corporation participated in a “reportable transaction,”
Regulations sections 301.9100-1 through 3).
attach Form 8886, Reportable Transaction Disclosure
Statement. If a reportable transaction results in a loss or credit
Do not use Form 1120X to... Instead, use . . .
carried back to a prior tax year, attach Form 8886 for the
carryback years.
Apply for a quick refund of
Form 4466, Corporation
estimated tax
Application for Quick Refund
Carryback Claims
of Overpayment of Estimated
If Form 1120X is used as a carryback claim, attach copies of
Tax
Form 1120, page 1 and the tax computation page, for both the
Obtain a tentative refund of
year the loss or credit originated and for the carryback year.
taxes due to:
Also attach any other forms, schedules, or statements that are
necessary to support the claim, including a statement that
• A net operating loss (NOL)
Form 1139, Corporation
shows all adjustments required to figure any NOL that was
carryback
Application for Tentative
carried back. At the top of the forms or schedules attached,
Refund
• A net capital loss carryback
write “Copy Only—Do Not Process.”
Note: Use Form 1139 only if 1
Carryback of an eligible small business credit (ESBC). If the
• An unused general business
year or less has passed since
credit carryback
corporation is an eligible small business (as defined in section
the tax year in which the
38(c)(5)(B)) and is using Form 1120X to claim a carryback of an
• A claim of right adjustment
carryback or adjustment
unused ESBC, enter “SBJA 2012” at the top of Form 1120X. For
under section 1341(b)(1)
occurred. Otherwise, use Form
details and special rules for an ESBC, see the Instructions for
1120X.
Form 3800.
Form 3115, Application for
Request IRS approval for a
Information on Income, Deductions, Tax
change in accounting method
Change in Accounting Method
Computation, etc.
For information on income, deductions, tax computation, etc.,
When To File
see the instructions for the tax return for the tax year being
File Form 1120X only after the corporation has filed its original
amended.
return. Generally, Form 1120X must be filed within 3 years after
Deductions for such items as charitable contributions
the date the corporation filed its original return or within 2 years
!
and the dividends-received deduction may have to be
after the date the corporation paid the tax (if filing a claim for a
refigured because of changes made to items of
refund), whichever is later. A return filed before the due date is
CAUTION
income or expense.
considered filed on the due date. A Form 1120X based on an
NOL carryback, a capital loss carryback, or general business
Where To File
credit carryback generally must be filed within 3 years after the
File this form at the applicable Internal Revenue Service Center
due date (including extensions) of the return for the tax year of
where the corporation filed its original return.
the NOL, capital loss, or unused credit. A Form 1120X based on
a bad debt or worthless security must be filed within 7 years
after the due date of the return for the tax year in which the debt
Specific Instructions
or security became worthless. See section 6511 for more
details and other special rules.
Tax Year
Note: It often takes 3 to 4 months to process Form 1120X.
In the space above the employer identification number, enter
Private delivery services. Corporations can use certain private
the ending month and year of the calendar or fiscal year for the
delivery services designated by the IRS to meet the “timely
tax return being amended.
mailing as timely filing” rule for tax returns. See the Instructions
Address
for Form 1120 for more information.
If the post office does not deliver mail to the street address and
the corporation has a P.O. box, show the box number instead.
4
Form 1120X (Rev. 11-2016)
Page
Who Must Sign
If the corporation receives its mail in care of a third party
(such as an accountant or an attorney), enter on the street
The return must be signed and dated by:
address line “C/O” followed by the third party’s name and street
• The president, vice president, treasurer, assistant treasurer,
address or P.O. box.
chief accounting officer, or
Column (a)
• Any other corporate officer (such as tax officer) authorized to
Enter the amounts from the corporation’s return as originally
sign.
filed or as it was later amended. If the return was changed or
If a return is filed on behalf of a corporation by a receiver,
audited by the IRS, enter the amounts as adjusted.
trustee, or assignee, the fiduciary must sign the return, instead
of the corporate officer. A return signed by a receiver or trustee
Column (b)
in bankruptcy on behalf of a corporation must be filed with a
Enter the net increase or net decrease for each line being
copy of the order or instructions of the court authorizing signing
changed. Use parentheses around all amounts that are
of the return.
decreases. Explain the increase or decrease in Part II.
If an employee of the corporation completes Form 1120X, the
paid preparer’s space should remain blank. Anyone who
Column (c)
prepares Form 1120X but does not charge the corporation
Note: Amounts entered on lines 1 through 4 in column (c) must
should not complete that section. Generally, anyone who is
equal the amounts that would be entered on the applicable lines
paid to prepare the return must sign it and fill in the “Paid
of the tax return if all adjustments and corrections were taken
Preparer Use Only” area.
into account.
See the Instructions for Form 1120 for more information.
Lines 1 and 2. Add the increase in column (b) to the amount in
column (a) or subtract the column (b) decrease from column (a).
Paperwork Reduction Act Notice. We ask for the information
Enter the result in column (c). For an item that did not change,
on this form to carry out the Internal Revenue laws of the
enter the amount from column (a) in column (c).
United States. You are required to give us the information. We
need it to ensure that you are complying with these laws and to
Line 4. Figure the new amount of tax using the taxable income
allow us to figure and collect the right amount of tax.
on line 3, column (c). Use Schedule J, Form 1120, of the original
return to make the necessary tax computation.
You are not required to provide the information requested on
a form that is subject to the Paperwork Reduction Act unless
Line 5e. Enter the amount of tax deposited with Form 7004,
the form displays a valid OMB control number. Books or
Application for Automatic Extension of Time To File Certain
records relating to a form or its instructions must be retained as
Business Income Tax, Information, and Other Returns.
long as their contents may become material in the
Line 5g. Include on line 5g any write-in credits or payments,
administration of any Internal Revenue law. Generally, tax
such as the credit for tax on ozone-depleting chemicals or
returns and return information are confidential, as required by
backup withholding.
section 6103.
Line 8. Enter the amount from the “Overpayment” line of the
The time needed to complete and file this form will vary
original return, even if the corporation chose to credit all or part
depending on individual circumstances. The estimated burden
of this amount to the next year’s estimated tax. This amount
for business taxpayers filing this form is approved under OMB
must be considered in preparing Form 1120X because any
control number 1545-0123 and is included in the estimates
refund due from the original return will be refunded separately
shown in the instructions for their business income tax return.
(or credited to estimated tax) from any additional refund claimed
If you have comments concerning the accuracy of these time
on Form 1120X. If the original return was changed by the IRS
estimates or suggestions for making this form simpler, we would
and the result was an additional overpayment of tax, also
be happy to hear from you. You can send us comments from
include that amount on line 8.
www.irs.gov/formspubs. Click on “More Information” and then
Line 10. Tax due. If the corporation does not use electronic
on “Give us feedback.” Or you can write to the Internal Revenue
funds transfers, including the Electronic Federal Tax Payment
Service, Tax Forms and Publications, 1111 Constitution Ave.
System (EFTPS), enclose a check with this form and make it
NW, IR-6526, Washington, DC 20224. Do not send the tax form
payable to the “United States Treasury.”
to this address. Instead, see Where To File, earlier.
Line 11. Overpayment. If the corporation is entitled to a refund
larger than the amount claimed on the original return, line 11 will
show only the additional amount of overpayment. This
additional amount will be refunded separately from the amount
claimed on the original return. The IRS will figure any interest
due and include it in the refund.
Line 12. Enter the amount, if any, to be applied to the
estimated tax for the next tax period. Also, enter that tax
period. No interest will be paid on this amount. The election to
apply part or all of the overpayment to the next year’s
estimated tax is irrevocable.

Download IRS Form 1120-X Amended U.S. Corporation Income Tax Return

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What to Include with the 1120X?

If the corrected amounts on IRS 1120X Form must be supported with a schedule, statement, or a form, the corporation must attach these documents as required. The corporation's name and employer identification number (EIN) must be included in every attachment. In addition, Form 8302, Electronic Deposit of Tax Refund of $1 Million or More, must be attached if the corporation is requesting an electronic refund of over a $1 million.

In case the amendment is made for a tax year when the corporation conducted a "reportable transaction" Form 8886, Reportable Transaction Disclosure Statement must be attached.

If Form 1120X is filed as a carryback claim, the corporation is required to attach copies of the first page of Form 1120, as well as the tax computation page, for both the tax year when the loss or credit occurred and for the carryback year. The copies should include a note stating "Copy Only-Do Not Process."

IRS Form 1120X Instructions

Corporations may file this form only after having filed its original return. Generally, the due date for filing this document is 3 years after the date of the original return or 2 years after the date when the tax was paid by the corporation (if filing a claim for a refund), whichever is later.

The 1120X Form must be signed and dated by the corporation's president, vice president, chief accounting officer, treasurer, assistant treasurer, or any corporate officer authorized to sign. A return that is filed by a receiver, trustee, or an assignee on behalf of a corporation must be signed by the fiduciary. Generally, anyone who gets paid to prepare the return is required to sign it and fill in the "Paid Preparer Use Only" section. If the person who prepares Form 1120X does not charge the corporation, the section mentioned above should remain blank.

IRS 1120-X Related Forms

  • 1120, U.S. Corporation Income Tax Return. Domestic corporations must file and submit Form 1120 to calculate their income tax liability and report losses, gains, deductions, income, and credits to the IRS.
  • 1120-C, U.S. Income Tax Return for Cooperative Associations. This form is used by corporations that operate on a cooperative basis to report their income, gains, losses, deductions, and credits, as well as to figure their income tax liability.
  • 1120-F, U.S. Income Tax Return of a Foreign Corporation. Foreign corporations file this form to report their income, gains, losses, deductions, and credits, and to figure their U.S. income tax liability.
  • 1120-H, U.S. Income Tax Return for Homeowners Associations. Homeowners associations use this form to exclude the exempt function income from its gross income.
  • 1120-L, U.S. Life Insurance Company Income Tax Return. Life insurance companies file this form to report income, gains, losses, deductions, and credits, and to figure their income tax liability.
  • 1120S, U.S. Income Tax Return for an S Corporation. This is a form used for reporting the income, gains, losses, deductions, and credits of a domestic corporation or any other entity for any tax year covered by an election to be an S corporation.
  • 1120-FSC, U.S. Income Tax Return of a Foreign Sales Corporation. Foreign Sales Corporation (FSC) or small FSC use this form to report their income, deductions, losses, gains, credits, and income tax liability.
  • 1120-IC-DISC, Interest Charge Domestic International Sales Corporation Return. This is a form filed by interest charge domestic international sales corporations (IC-DISCs), former DISCs, and former IC-DISCs.
  • 1120-POL, US Income Tax Return for Certain Political Organizations. This form is used by political organizations and certain exempt organizations to report their political organization taxable income and income tax liability section 527.
  • 1120-ND, Return for Nuclear Decommissioning Funds and Certain Related Persons. Nuclear decommissioning funds use this form to report income earned, contributions received, the administrative expenses of fund operation, the tax on modified gross income, and the section 4951 initial taxes.
  • 1120-PC, U.S. Property and Casualty Insurance Company Income Tax Return. This form is filed with the IRS to report the income, gains, losses, deductions, and credits, and to figure the income tax liability of insurance companies, apart from life insurance companies.
  • 1120-REIT, U.S. Income Tax Return for Real Estate Investment Trusts. Corporations, trusts, and associations electing to be treated as Real Estate Investment Trusts use this form to report their income, deductions, credits, gains, losses, certain penalties, and income tax liability.
  • 1120-RIC, U.S. Income Tax Return for Regulated Investment Companies. Regulated investment companies (RIC) file this form with the IRS to report their income, deductions, gains, losses, credits, and to calculate their income tax liability.
  • 1120-SF, U.S. Income Tax Return for Settlement Funds (Under Section 468B). Qualified settlement funds file this form with the IRS to report transfers received, income earned, deductions claimed, distributions made, and a designated or qualified settlement fund income tax liability.
  • 1120-W, Estimated Tax for Corporations. Corporations file this form to estimate their tax liability and to figure the amount of their estimated tax payments.
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