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Federal Free Printable Form 945-X (Rev. February 2025) for 2026 Federal Ownership Certificate

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Form 1000 is obsolete, and is no longer supported by the Federal Department of Revenue.

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Ownership Certificate
Form 945-X (Rev. February 2025)

Form 945-X: Adjusted Annual Return of Withheld Federal Income Tax or Claim for Refund (Rev. February 2025) Department of the Treasury — Internal Revenue Service Employer identification number (EIN) OMB No. 1545-0029 Return You’re Correcting ... — Enter the calendar year of the return you’re correcting: Name (not your trade name) (YYYY) Trade name (if any) Enter the date you discovered errors: Address Number Street Suite or room number City Foreign country name / / (MM / DD / YYYY) ZIP code State Foreign postal code Foreign province/county Read the separate instructions before you complete this form. Use this form to correct administrative errors made on Form 945, Annual Return of Withheld Federal Income Tax. Use a separate Form 945-X for each year that needs correction. Type or print within the boxes. You MUST complete both pages. Don’t attach this form to Form 945. Part 1: Select ONLY one process. 1. Adjusted return of withheld federal income tax. Check this box if you underreported amounts. Also check this box if you overreported amounts and you would like to use the adjustment process to correct the errors. You must check this box if you’re correcting both underreported and overreported amounts on this form. The amount shown on line 5, if less than zero, may only be applied as a credit to your Form 945 for the tax period in which you’re filing this form. 2. Claim. Check this box if you overreported amounts only and you would like to use the claim process to ask for a refund or abatement of the amount shown on line 5. Don’t check this box if you’re correcting ANY underreported amounts on this form. Part 2: Enter the corrections for the calendar year you’re correcting. If any line doesn’t apply, leave it blank. Column 1 Total corrected amount (for ALL payees) Column 2 Column 3 Amount originally reported or as previously corrected (for ALL payees) — = Difference (If this amount is a negative number, use a minus sign.) 3. Federal income tax withheld (Form 945, line 1) . — . = . 4. Backup withholding (Form 945, line 2) . — . = . . . 5. Total. Combine the amounts on lines 3 and 4 of Column 3 . . . . . . . If line 5 is less than zero: • If you checked line 1, this is the amount you want applied as a credit to your Form 945 for the tax period in which you’re filing this form. • If you checked line 2, this is the amount you want refunded or abated. If line 5 is more than zero, this is the amount you owe. Pay this amount when you file this return. For information on how to pay, see Amount you owe in the instructions for line 5. For Paperwork Reduction Act Notice, see the separate instructions. www.irs.gov/Form945X Cat. No. 20336X Form 945-X (Rev. 2-2025) Name (not your trade name) Correcting Calendar Year (YYYY) Employer identification number (EIN) – Part 3: Explain your corrections for the calendar year you’re correcting. 6. Check here if any corrections you entered on a line include both underreported and overreported amounts. Explain both your underreported and overreported amounts on line 7. 7. You must give us a detailed explanation of how you determined your corrections. See the instructions. Part 4: Sign here. You must complete both pages of this form and sign it. Under penalties of perjury, I declare that I have filed an original Form 945 and that I have examined this adjusted return or claim, including accompanying schedules and statements, and to the best of my knowledge and belief, it is true, correct, and complete. Declaration of preparer (other than taxpayer) is based on all information of which preparer has any knowledge. Print your name here Sign your name here Date Print your title here / / Best daytime phone Paid Preparer Use Only Check if you’re self-employed Preparer’s name PTIN Preparer’s signature Date Firm’s name (or yours if self-employed) EIN Address Phone City Page 2 State . . . / . . . . . / ZIP code Form 945-X (Rev. 2-2025)
Extracted from PDF file 2025-federal-form-1000.pdf, last modified February 2025

More about the Federal Form 1000 Corporate Income Tax TY 2025

We last updated the Ownership Certificate in January 2026, so this is the latest version of Form 1000, fully updated for tax year 2025. You can download or print current or past-year PDFs of Form 1000 directly from TaxFormFinder. You can print other Federal tax forms here.


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Other Federal Corporate Income Tax Forms:

TaxFormFinder has an additional 774 Federal income tax forms that you may need, plus all federal income tax forms.

Form Code Form Name
Form W-9 Request for Taxpayer Identification Number and Certification
Form 4684 Casualties and Thefts
941 (Schedule B) Report of Tax Liability for Semiweekly Schedule Depositors
990 (Schedule O) Supplemental Information to Form 990 or 990-EZ
Form 1120-S U.S. Income Tax Return for an S Corporation

Download all  tax forms View all 775 Federal Income Tax Forms


Form Sources:

The Internal Revenue Service usually releases income tax forms for the current tax year between October and January, although changes to some forms can come even later. We last updated Federal Form 1000 from the Internal Revenue Service in January 2026.

Show Sources >

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 Federal Form 1000

We have a total of nine past-year versions of Form 1000 in the TaxFormFinder archives, including for the previous tax year. Download past year versions of this tax form as PDFs here:


2025 Form 1000

Form 945-X (Rev. February 2025)

2020 Form 1000

Form 945-X (Rev. February 2014)

2019 Form 1000

Form 1000 (Rev. September 2016)

2018 Form 1000

Form 1000 (Rev. September 2016)

2017 Form 1000

Form 1000 (Rev. September 2016)

2016 Form 1000

Form 1000 (Rev. September 2016)

Ownership Certificate 2015 Form 1000

Form 1000 (Rev. December 2005)

Ownership Certificate 2012 Form 1000

Form 1000 (Rev. December 2005)

Ownership Certificate 2011 Form 1000

Form 1000 (Rev. December 2005)


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Source: http://www.taxformfinder.org/federal/form-1000