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IRSCorporate Tax (1120 Series)

Official form guide

Form 1120-SG: 1120 (Schedule G)

Form 1120 Schedule G is an attachment to the corporate income tax return (Form 1120) that reports additional corporate information required by the IRS. It is filed by corporations that must provide details such as business activity codes, shareholder information, and certain elections.

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Form Overview

IRS Form 1120-SG - 1120 (Schedule G)

Form 1120 Schedule G is an attachment to the corporate income tax return (Form 1120) that reports additional corporate information required by the IRS. It is filed by corporations that must provide details such as business activity codes, shareholder information, and certain elections.

It captures the corporation’s principal business activity, NAICS code, shareholder count, election statements, and any changes in ownership or accounting methods.

Risk Radar

Scan points
  • 1A single typo in the NAICS code can cause the entire return to be rejected.
  • 2Incorrect or missing NAICS code
  • 3Shareholder count misreported
  • 4Failure to disclose required elections
  • 5Mismatched EIN between Form 1120 and Schedule G

Plain English

Schedule G is a short questionnaire that goes on a corporation’s main tax return. It tells the IRS what the company does, who owns it, and whether it made any special tax elections. You only need to fill it out if the IRS asks for it on the 1120.

Submission Date

  • Filing date: 2012-07-17 00:00:00
  • Preparation window: collect IDs, supporting records, and signatures in advance.
  • Final review: verify names, dates, and required fields before submission.

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Glossary Terms

income taxownershipincome

Hover a term to preview the meaning.

What this form is for

  • Use when the IRS instruction sheet lists Schedule G as required for your corporation.
  • Do not use if you are filing a Form 1120‑S (S corporation) – that return has its own Schedule K‑1.
  • Check Form 1120‑F if you are a foreign corporation.

Form selector

Use this form or another form?

Corporation with no shareholders changes

No extra info required

✓ Verify shareholder count first

Form 1120 (no Schedule G)

S corporation filing

Different schedule (Schedule K‑1)

✓ Ensure you are not mixing forms

Form 1120‑S

Foreign corporation

Different filing requirements

✓ Confirm residency status

Form 1120‑F

Deadline or filing window

Schedule G must be filed by the corporate income tax return deadline, typically the 15th day of the fourth month after the tax year ends. Extensions for Form 1120 also extend Schedule G. If the corporation uses a fiscal year, adjust the deadline accordingly.

  • —Number of shareholders | direct entry | Shareholder count | Verify against corporate ledger

Checklist

What you need before filling it out

1

Principal business activity

Business description, industry classification · Tax return, corporate charter

⚠ Often left blank or mismatched✕ Medium
2

NAICS code

Industry code list · IRS instructions, industry association

⚠ Wrong digit count or outdated code✕ High
3

Shareholder count

Stock ledger, shareholder register · Corporate minutes

⚠ Forgetting recent transfers✕ Medium
4

Election statements

Board resolutions, prior year returns · Corporate records

⚠ Missing election disclosure✕ High
5

Accounting method change

Prior year tax return, board memo · Form 1120, Schedule G line 10

⚠ Unreported change✕ High

Before you submit

  1. 1Verify EIN matches on Form 1120 and Schedule G
  2. 2Confirm edition date matches the 2024 package
  3. 3Check all required lines are completed
  4. 4Cross‑check NAICS code with industry list
  5. 5Confirm shareholder count is accurate as of year‑end
  6. 6Ensure any elections are properly indicated
  7. 7Attach Schedule G to the front of Form 1120
  8. 8Sign and date Form 1120
  9. 9If e‑filing, confirm software includes Schedule G attachment
  10. 10If mailing, use the correct IRS address for your state
  11. 11Keep a copy of the signed return and Schedule G for records
  12. 12Record the filing confirmation number or certified mail receipt

How to file this form

  1. 1Prepare Form 1120 using tax software or paper forms.
  2. 2Open Schedule G and fill in lines 1‑12 per instructions.
  3. 3Review NAICS code and shareholder data against corporate records.
  4. 4Attach Schedule G to the front of the completed Form 1120.
  5. 5Sign the Form 1120; Schedule G does not require a separate signature.
  6. 6Choose filing method: e‑file through approved software or mail to the IRS address.
  7. 7Obtain and retain filing acknowledgment (e‑file receipt or certified mail proof).

Known limitations

  1. 1Instructions do not list a separate filing fee for Schedule G.
  2. 2IRS does not provide an online validation tool for NAICS codes on Schedule G.
  3. 3The form does not capture detailed shareholder ownership percentages.
  4. 4Electronic filing requires compatible software; not all providers support Schedule G.

Field map

Compact field-by-field guide

9 fields

Entity Info

2 items

Corporation Name and EIN

Full legal name of the corporation and its Employer Identification Number.

Requiredtext
Address and Date Incorporated

Current mailing address and date of incorporation.

Requiredtext

Income

3 items

Gross Receipts or Sales

Total revenue from business operations before deducting costs.

Requiredamount
Cost of Goods Sold

Direct costs attributable to producing goods sold by the corporation.

amount
Total Income

Gross receipts minus cost of goods sold and returns/allowances.

Requiredamount

Deductions

1 items

Total Deductions

Sum of all business expenses including compensation, rent, interest, taxes, and depreciation.

Requiredamount

Tax

2 items

Taxable Income

Total income minus total deductions.

Requiredamount
Total Tax

Tax calculated on taxable income using the applicable corporate tax rate, minus any credits.

Requiredamount

Signatures

1 items

Officer Signature

An authorized corporate officer must sign and date the return.

Requiredsignature
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Current form status
IRS

The latest revision of Schedule G is tied to the 2024 Form 1120 package. Verify the edition date on the first page before filing.

What changed or needs a fresh check

  • Edition date – confirm it matches the 2024 Form 1120 package
  • Fee – no separate fee for Schedule G; included in Form 1120 filing
  • Mailing address – use the address listed in the Form 1120 instructions for your state
  • Electronic filing – ensure your software supports Schedule G attachment
  • Signature line – appears on Form 1120, not on Schedule G

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Form 1120-SG page 1

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Form 1120-SG page 2

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Quick Facts

Corporations filing Form 1120 that are required to disclose the Schedule G items must attach this schedule.
It captures the corporation’s principal business activity, NAICS code, shareholder count, election statements, and any changes in ownership or accounting methods.
Schedule G is filed together with the corporate income tax return, normally by the 15th day of the fourth month after the corporation’s tax year ends (e.g., April 15 for calendar‑year filers).
Attach Schedule G to the completed Form 1120 and submit the packet to the IRS address specified in the Form 1120 instructions, or file electronically via the IRS e‑file system.
Errors can trigger processing delays, penalties, or a request for additional information, which may postpone any refund or increase audit exposure.
1. Gather the corporation’s EIN, tax year dates, and NAICS code. 2. Count total shareholders and note any changes during the year. 3. Complete each line of Schedule G, referencing the Form 1120 instructions for definitions. 4. Review for completeness, sign the attached Form 1120, and combine the documents for filing.

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After you file

  1. 1Store a complete copy of the filed return and Schedule G for at least 7 years.
  2. 2Record the filing date and any IRS acknowledgment number.
  3. 3Monitor for IRS notices regarding missing or inconsistent Schedule G information.
  4. 4Update corporate records to reflect any elections or changes reported.
  5. 5If an extension was filed, note the new deadline and ensure Schedule G is attached to the extended return.
  6. 6Prepare for possible audit by keeping supporting documents (e.g., shareholder register, NAICS reference).
  7. 7Review the next year’s filing requirements early to catch any changes in reporting rules.

Sources

  • SRCIRS Form 1120 InstructionsSchedule G section (2024 edition)
  • SRCIRS Publication 542Corporations (provides filing deadline guidance)
  • SRCIRS NAICS Code lookup toolreferenced in Schedule G instructions
  • SRCIRS e‑file system requirementsconfirms attachment capability
  • SRCForm 1120‑S instructionsclarifies that Schedule G is not used for S corporations
  • SRCIRS Form 1120‑F instructionsindicates alternate form for foreign corporations
  • SRCNot clearly stated in the provided official sourcespecific penalty amounts for Schedule G errors

Common confusion points

Schedule G vs. Schedule K‑1

Different forms for C vs. S corporations

→ Verify corporation type before attaching

NAICS vs. SIC code

Both are industry codes but only NAICS is accepted

→ Use the IRS NAICS lookup tool

Shareholder count vs. shareholder ownership %

Schedule G asks only for count

→ Do not list percentages unless specifically requested

Election statements location

Some think they go on Schedule G, others on Form 1120

→ Follow line instructions for each election

Filing deadline for fiscal year

Calendar‑year deadline is well known

→ Calculate fourth month after fiscal year end

Workflow map

Related forms and next steps

5 signals

Before

Form 1120 – Main corporate income tax return

Current

1120-SG

After

Schedule M‑3 (if required) – Reconciliation of book and tax income

Often used with

Schedule G – Additional corporate information

⚠ If something goes wrong

  • Form 1120‑X – Amended corporate return
  • Form 1120‑F – Separate filing path

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Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
Public DomainCreated by the U.S. federal government. Not subject to copyright (17 USC § 105). Freely copyable without restriction.
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