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Form 1120: U.S. Corporation Income Tax Return
IRS Form 1120 is used to report a corporation's income, gains, losses, deductions, and credits to determine its tax liability. All domestic corporations must file this form unless exempt under section 501. Late filing penalties can reach up to 25% of unpaid tax.
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IRS Form 1120 - U.S. Corporation Income Tax Return
IRS Form 1120 is used to report a corporation's income, gains, losses, deductions, and credits to determine its tax liability. All domestic corporations must file this form unless exempt under section 501. Late filing penalties can reach up to 25% of unpaid tax.
Risk Radar
Scan points- 1If using Schedule M-1 instead of full M-3, Line 1 on M-1 must equal Part I, line 11 of M-3.
- 2Failing to file Form 8938 if specified foreign financial assets exceed $50,000 (year-end) or $75,000 (during the year).
- 3Forgetting to check 'Yes' on Schedule N, Question 8, when filing Form 8938 with Form 1120.
- 4If using Schedule M-1 instead of full Schedule M-3, ensure that Line 1 of Schedule M-1 equals Part I, line 11 of Schedule M-3.
- 5Failing to attach Form 5472 when a domestic disregarded entity is covered by certain rules and files pro forma Form 1120.
Plain English
This form helps a business calculate how much income tax it owes based on its total revenue and expenses for the year. It is required by law for most domestic corporations, regardless of whether they made a profit or loss. Filing accurately ensures compliance with federal tax laws.
Submission Date
- Filing date: 2026-01-20 12:10:35
- Preparation window: collect IDs, supporting records, and signatures in advance.
- Final review: verify names, dates, and required fields before submission.
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What this form is for
- Use this form when reporting a corporation's income, gains, losses, deductions, credits, and figuring the income tax liability of a corporation.
- Do not use it when filing as an individual or household (the source does not specify alternatives).
- Check Form 851 instead when attaching a consolidated return.
Deadline or filing window
The 2025 Form 1120 covers the calendar year 2025 and fiscal years beginning in 2025 and ending in 2026. For a short tax year beginning and ending in 2025, filing cannot occur before the earlier of its extended due date or January 15, 2026.
Checklist
What you need before filling it out
Purpose of Form
Use Form 1120, U.S. Corporation Income Tax Return · Instructions p.2
Filing Deadline (General)
File by the 15th day of the 4th month after the end of its tax year · Instructions p.4
Consolidated Filing
Attach a separate Form 1122 for each new subsidiary being included in the return · Instructions p.8
Partnership Income Reporting
Show ordinary income from Schedule K-1 (Form 1065) on line 26 and include losses there · Instructions p.11
Religious Exemption Filing
Write “Religious Exemption” at the top of page 1 of Form 1120 · Instructions p.4
Before you submit
- 1Confirm you use the current edition of Form 1120 and that all domestic corporations file unless exempt under section 501.
- 2For disregarded entities, ensure a pro forma Form 1120 is filed with the necessary attachment of Form 5472.
- 3If calculating tax liability using Schedule M-3, you must either complete the entire schedule or use Part I alongside Form 1120 and Schedule M-1.
- 4Check Item A, box 4 on Form 1120 to confirm that any attached Schedule M-3 has been properly indicated.
- 5Verify compliance with penalties: failure to file may incur a penalty of 5% of unpaid tax per month up to 25%.
- 6Remember that interest is charged from the due date (including extensions) for both unpaid taxes and penalties; confirm the minimum penalty calculation for 2026.
How to file this form
- 1Determine if the corporation qualifies for any exemption; otherwise, prepare Form 1120 using the current edition.
- 2Gather required supporting statements, including separate Forms 1122 for consolidated returns or specific details regarding FASIT ownership interests.
- 3Complete all applicable entry spaces on Form 1120 and accompanying schedules, ensuring no placeholder text is used.
- 4File the completed return at the applicable IRS address as directed by Notice 2024-18, and retain proof of mailing or submission.
Known limitations
- 1A corporation must file Form 1120 unless it is exempt under section 501.
- 2Domestic corporations may file a special return instead of Form 1120 if they are certain organizations.
- 3If a corporation holds an ownership interest in a FASIT to which special rules apply, it must report all items of income, gain, deductions, losses, and credits on the corporation’s return (except as provided in section 860H).
- 4A corporation intending to self-certify as a qualified opportunity fund (QOF) must file Form 1120 and attach Form 8996, even if it had no income or expenses to report.
- 5If the value of a corporation’s specified foreign financial assets is more than $50,000 on the last day of the tax year or more than $75,000 at any time during the tax year, Form 8938 must be filed each year.
Field map
Compact field-by-field guide
Entity Info
2 items
Full legal name of the corporation and its Employer Identification Number.
Current mailing address and date of incorporation.
Income
3 items
Total revenue from business operations before deducting costs.
Direct costs attributable to producing goods sold by the corporation.
Gross receipts minus cost of goods sold and returns/allowances.
Deductions
1 items
Sum of all business expenses including compensation, rent, interest, taxes, and depreciation.
Tax
2 items
Total income minus total deductions.
Tax calculated on taxable income using the applicable corporate tax rate, minus any credits.
Signatures
1 items
An authorized corporate officer must sign and date the return.
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Fillable formOpen in Editor->The 20/25 edition of IRS Form 1120, U.S. Corporation Income Tax Return, is available; users should go to IRS.gov/Form1120 for the latest information regarding developments.
What changed or needs a fresh check
- Edition date — confirm the revision reads 20/25.
- Fee — Not stated in the official source.
- Mailing address — File at the applicable IRS address, as directed by Notice 2024-18.
- Signature — No specific signature requirement is listed for filing.
Quick Facts
Downloads
After you file
- 1Retain a copy of the filed Form 1120 and all supporting statements for tax records.
- 2Keep documentation regarding any election to be taxed as a corporation, especially concerning FASIT ownership interests.
- 3Monitor IRS.gov/Form1120 for future developments or changes in legislation related to this form.
- 4If filing late, note that the minimum penalty for failure to file a return required in 2026 is the smaller of the tax due or $525.
Sources
- SRCInstructions p.1 — For developments related to Form 1120, go to IRS.gov/Form1120 .
- SRCInstructions p.2 — Use Form 1120 to report the income, gains, losses, deductions, credits, and to figure the income tax liability of a corporation.
- SRCInstructions p.2 — Unless exempt under section 501, all domestic corporations must file an income tax return whether or not they have taxable income.
- SRCInstructions p.3 — If a corporation intends to self-certify as a qualified opportunity fund (QOF), it must file Form 1120 and attach Form 8996, Qualified Opportunity Fund, even if the corporation had no income or expenses to report.
- SRCInstructions p.3 — If the corporation held a qualified investment in a QOF at any time during the year, it must file its return with Form 8997, Initial and Annual Statement of Qualified Opportunity Fund (QOF) Investments, attached.
- SRCInstructions p.6 — Other penalties can be imposed for negligence, substantial understatement of tax, reportable transaction understatements, and fraud, citing sections 6662, 6662A, and 6663.
- SRCInstructions p.8 — Form 8938 must be filed each year the value of the corporation’s specified foreign financial assets is more than $50,000 on the last day of the tax year or more than $75,000 at any time during the tax year.
- SRCInstructions p.10 — For tax years ending after July 4, 2025, section 139L allows a qualified lender to exclude 25% of the interest income received on any qualified real estate loan secured by rural or agricultural real property.
Common confusion points
Do I need to file even if my corporation has no income or expenses?
A corporation must file Form 1120 and attach Form 8996, Qualified Opportunity Fund, even if it had no income or expenses to report.
If I have a qualified investment in a QOF, what do I need besides Form 1120?
I am filing for tax years ending after July 4, 2025; how does section 139L affect me?
Do I offset interest expense against interest income?
When reporting foreign assets, which form must I file with Form 1120?
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Related forms and next steps
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Questions about IRS Form 1120
What is IRS Form 1120 used for?
This form helps a business calculate how much income tax it owes based on its total revenue and expenses for the year. It is required by law for most domestic corporations, regardless of whether they made a profit or loss. Filing accurately ensures compliance with federal tax laws.
Who must file IRS Form 1120?
All domestic corporations (including corporations in bankruptcy) must file Form 1120 unless exempt under section 501. A domestic disregarded entity covered by certain rules is required to file a pro forma Form 1120 with Form 5472 attached.
What information does IRS Form 1120 require?
The form collects details on the corporation's income and deductions to calculate tax liability. If filing Schedule M-3, filers must either complete it entirely or use Part I of Schedule M-3 along with Form 1120, Schedule M-1.
When is IRS Form 1120 due?
Interest is charged from the due date (including extensions) to the date of payment for penalties and unpaid taxes. The minimum penalty for a tax return required in 2026 that is more than 60 days late is the smaller of the tax due or $525.
Where do I file IRS Form 1120?
The source does not provide specific filing locations or service centers for Form 1120.
How do I complete IRS Form 1120?
The corporation must use the current edition of Form 1120. If filing Schedule M-3, filers must check Item A, box 4, to indicate that the schedule is attached. The form requires calculating income and losses from various sources listed in the body sections.
What happens if IRS Form 1120 is filed incorrectly?
Failure to file by the due date may result in a penalty of 5% of unpaid tax for each month or part of a month, up to a maximum of 25%. Interest is also charged on penalties and unpaid taxes.
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