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IRSCorporate Tax (1120 Series)

Official form guide

Form 1120-SB: 1120 (Schedule B)

Form 1120‑SB is the U.S. income tax return for small business corporations that meet specific asset and shareholder limits. Use it to report income, deductions, and tax liability for the tax year.

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Form Overview

IRS Form 1120-SB - 1120 (Schedule B)

Form 1120‑SB is the U.S. income tax return for small business corporations that meet specific asset and shareholder limits. Use it to report income, deductions, and tax liability for the tax year.

The form captures total revenue, cost of goods sold, deductions, credits, tax liability, and shareholder information.

Risk Radar

Scan points
  • 1One mistake can disqualify the corporation from the simplified 1120‑SB and force a full Form 1120 filing.
  • 2Missing the March 15 filing deadline
  • 3Incorrect asset or shareholder count causing ineligibility
  • 4Omitting Schedule B shareholder details
  • 5Miscalculating taxable income or credits

Plain English

If your corporation is small enough—generally less than $250,000 in assets and 100 or fewer shareholders—you file this short return instead of the regular corporate return. It tells the IRS how much money the business made and what taxes are owed.

Submission Date

  • Filing date: 2018-11-15 22:00:08
  • 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 taxliabilityincomemoney

Hover a term to preview the meaning.

What this form is for

  • Use when the corporation has ≤ $250,000 total assets and ≤ 100 shareholders.
  • Do not use if the corporation exceeds either threshold.
  • If the corporation has foreign shareholders or special tax elections, consider Form 1120.

Form selector

Use this form or another form?

Assets > $250k or >100 shareholders

Full corporate return required

✓ Verify counts before filing

Form 1120

Qualified Subchapter S election

Different tax treatment

✓ Confirm S‑corp status

Form 1120‑S

Non‑profit corporation

Tax‑exempt filing

✓ Check nonprofit status

Form 990

Deadline or filing window

For a calendar‑year corporation, the return is due March 15 of the following year. If the 15th falls on a weekend or holiday, the deadline moves to the next business day. Extensions can be requested with Form 7004, extending the deadline by six months.

  • —Gross receipts | sum of all revenue lines | Taxable income | Verify against Schedule M‑1

Checklist

What you need before filling it out

1

Total assets

Balance sheet · Year‑end balance sheet

⚠ Often omitted or outdated✕ High
2

Shareholder count

Shareholder ledger · Corporate minutes

⚠ Miscounted shareholders✕ Medium
3

Taxable income

Income statement · Profit‑and‑loss statement

⚠ Arithmetic errors✕ High
4

Credits claimed

Credit worksheets · Supporting schedules

⚠ Missing documentation✕ Medium

Before you submit

  1. 1Confirm corporation meets asset and shareholder limits
  2. 2Verify all financial statements are finalized
  3. 3Complete Schedule B with accurate shareholder info
  4. 4Re‑calculate taxable income and tax liability
  5. 5Attach any required supporting schedules
  6. 6Sign with an authorized officer
  7. 7If paper, use correct IRS mailing address
  8. 8If e‑filing, ensure the PIN or signature code is entered
  9. 9Retain a copy of the filed return and acknowledgment

How to file this form

  1. 1Gather year‑end financial statements and balance sheet
  2. 2Check eligibility thresholds (assets ≤ $250k, shareholders ≤ 100)
  3. 3Enter income, deductions, and credits on Form 1120‑SB
  4. 4Fill Schedule B with shareholder names, SSNs/EINs, and ownership percentages
  5. 5Calculate tax due and complete payment vouchers if needed
  6. 6Sign the form or enter electronic signature
  7. 7Submit via IRS e‑file or mail to the designated address

Known limitations

  1. 1Form does not accommodate corporations with foreign shareholders
  2. 2No built‑in validation for asset threshold; user must verify manually
  3. 3Electronic filing requires compatible tax software
  4. 4Instructions may lag behind last‑minute IRS updates

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 is the 2024 edition, released October 2023. Check the IRS website for any updates before filing.

What changed or needs a fresh check

  • Edition date: 2024 (released Oct 2023)
  • Fee: No filing fee for paper or e‑file
  • Mailing address: IRS address per state in the instructions
  • Electronic filing: Use IRS Modernized e‑File (MeF) system
  • Signature: Authorized corporate officer must sign

Form Preview

Form 1120-SB page 1

Page 1

Form 1120-SB page 2

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Quick Facts

Small business corporations that qualify under the IRS asset and shareholder thresholds must file.
The form captures total revenue, cost of goods sold, deductions, credits, tax liability, and shareholder information.
The return is due the 15th day of the fourth month after the corporation’s tax year ends (typically March 15 for calendar‑year filers).
File electronically through the IRS e‑file system or mail the signed paper form to the address listed in the IRS instructions for the corporation’s state.
Errors can trigger penalties, delay refunds, or cause the IRS to re‑assess tax, which may increase interest and fees.
Gather year‑end financial statements, calculate taxable income, complete Schedule B for shareholder info, fill out the main 1120‑SB pages, sign, and submit either electronically or by mail. Verify that the corporation meets the small‑business eligibility before filing.

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After you file

  1. 1Save the filed return and acknowledgment receipt
  2. 2Record the filing date and payment confirmation
  3. 3Monitor for IRS notices or balance‑due letters
  4. 4Keep supporting documents for at least seven years
  5. 5Update corporate records with the filing status
  6. 6If an extension was filed, note the new deadline

Sources

  • SRCIRS Form 1120‑SB instructions (2024 edition)
  • SRCIRS Publication 542 (Corporations)
  • SRCIRS e‑file system guidelines
  • SRCNot found in provided source: specific state mailing addresses
  • SRCNot found in provided source: exact penalty amounts
  • SRCNot found in provided source: electronic signature PIN format

Common confusion points

Asset limit vs. revenue limit

Users mix up the $250k asset cap with income caps

→ Verify total assets on balance sheet

Schedule B requirement

Some think it’s optional

→ Schedule B is mandatory for all 1120‑SB filers

Electronic signature vs. physical signature

e‑file needs a PIN, paper needs a wet signature

→ Use the correct method for your filing type

Extension filing

Form 7004 is for Form 1120, not 1120‑SB

→ Request extension with Form 7004 only if IRS permits

Tax year definition

Calendar vs. fiscal year confusion

→ Use the corporation’s adopted tax year in all calculations

Workflow map

Related forms and next steps

1 signals

Before

Form 941 (quarterly payroll) | Used with: Form 1120‑SB | After: Form 7004 (extension) | If something goes wrong: Form 12153 (request for penalty abatement)

Current

1120-SB

After

None listed

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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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