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IRSCorporate Tax (1120 Series)

Official form guide

Form 1120-SSK: 1120-S (Schedule K-1)

Form 1120‑S Schedule K‑1 reports each shareholder’s share of an S corporation’s income, deductions, credits, and other items. It is filed with the corporation’s Form 1120‑S and provided to each shareholder for their personal tax return.

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Form Overview

IRS Form 1120-SSK - 1120-S (Schedule K-1)

Form 1120‑S Schedule K‑1 reports each shareholder’s share of an S corporation’s income, deductions, credits, and other items. It is filed with the corporation’s Form 1120‑S and provided to each shareholder for their personal tax return.

It captures the shareholder’s proportionate share of ordinary income, capital gains, deductions, credits, and other tax items for the year.

Risk Radar

Scan points
  • 1A single mis‑reported amount can trigger penalties for every shareholder.
  • 2Mismatched ownership percentages between corporate books and K‑1
  • 3Omitting or double‑counting a deduction or credit
  • 4Using the wrong tax year on the K‑1
  • 5Failing to attach K‑1s to the corporate return

Plain English

When an S corporation earns money, the IRS wants to know how that money is split among the owners. The K‑1 is the paper that tells each owner what they must report on their own return. The corporation prepares one K‑1 per shareholder.

Submission Date

  • Filing date: 2026-01-13 09:10:48
  • 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

ordinaryincomepaperownermoney

Hover a term to preview the meaning.

What this form is for

  • Use when filing an S corporation’s Form 1120‑S.
  • Do not use for partnerships (Form 1065) or C corporations.
  • If the corporation has no shareholders or is a single‑member LLC, check Form 1040 Schedule C instead.

Form selector

Use this form or another form?

Partnership income allocation

Partnership tax treatment differs

✓ Verify entity classification first

Form 1065 Schedule K‑1

C corporation dividends

Not pass‑through

✓ Use only for C‑corp shareholders

Form 1120, Schedule K

LLC taxed as partnership

Same pass‑through but different filing entity

✓ Confirm election status

Form 1065 Schedule K‑1

Deadline or filing window

The corporation’s Form 1120‑S and all attached Schedule K‑1s are due by the 15th day of the third month after the tax year ends (typically March 15). An automatic six‑month extension moves the deadline to September 15, but the K‑1s must still be provided to shareholders by the original due date.

  • —Shareholder ownership % | Multiply total ordinary income by % | Shareholder ordinary income | Round to nearest dollar

Checklist

What you need before filling it out

1

Shareholder name/SSN

Shareholder agreement or stock ledger · Corporate records

⚠ Misspelled name or wrong SSN✕ High
2

Ordinary business income

Corporate profit and loss statement · Accounting software

⚠ Using pre‑tax profit instead of taxable income✕ Medium
3

Capital gains

Schedule of asset sales · Brokerage statements

⚠ Forgetting wash‑sale adjustments✕ Medium
4

Credits (e.g., investment)

Credit documentation · IRS Form 3468

⚠ Omitting credit amount✕ High
5

Foreign transactions

Form 5471/8858 data · International tax reports

⚠ Missing foreign tax credit✕ High

Before you submit

  1. 1Confirm the form version matches the tax year
  2. 2Verify each shareholder’s ownership percentage is current
  3. 3Reconcile total amounts on all K‑1s with the corporation’s Form 1120‑S totals
  4. 4Check SSN/EIN entries for accuracy
  5. 5Ensure all required boxes (e.g., box 1‑13) are filled
  6. 6Attach all K‑1s to the corporate return before mailing or e‑filing
  7. 7Sign and date the corporate officer signature block on Form 1120‑S
  8. 8If filing by paper, use the correct IRS mailing address
  9. 9If e‑filing, run the software validation check
  10. 10Provide each shareholder a copy (paper or electronic) by the filing deadline
  11. 11Retain a copy of the filed return and all K‑1s for at least three years

How to file this form

  1. 1Gather year‑end financial statements and shareholder ledger
  2. 2Calculate each shareholder’s share of income, deductions, and credits
  3. 3Complete Part II of Schedule K‑1 for each shareholder
  4. 4Enter totals on Form 1120‑S and attach all K‑1s
  5. 5Review for consistency between corporate totals and summed K‑1 amounts
  6. 6File Form 1120‑S electronically or mail to the IRS address
  7. 7Distribute K‑1 copies to shareholders
  8. 8Keep a master file of the return and supporting schedules

Known limitations

  1. 1The form does not calculate shareholder tax liability; owners must transfer amounts to their personal returns.
  2. 2Only the corporation can correct a K‑1 after filing; shareholders cannot amend it themselves.
  3. 3Electronic filing requires approved software; not all commercial products support Schedule K‑1 generation.
  4. 4The IRS does not provide a public validation tool for K‑1 data.

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 IRS has released the 2024 revision of Form 1120‑S Schedule K‑1. No further updates have been issued for the 2024 filing year.

What changed or needs a fresh check

  • Edition date: verify the form is the 2024 version
  • Fee: no filing fee for Form 1120‑S or K‑1
  • Mailing address: IRS Center, Ogden, UT 84201 (if filing by paper)
  • Electronic filing: use approved software for MeF
  • Signature requirement: corporate officer must sign Form 1120‑S, not each K‑1
  • Paper size: 8.5" x 11"

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Quick Facts

The S corporation prepares and issues the Schedule K‑1; each shareholder receives a copy.
It captures the shareholder’s proportionate share of ordinary income, capital gains, deductions, credits, and other tax items for the year.
The K‑1 is due when the corporation files its Form 1120‑S, generally by March 15 (or the 15th day of the third month after year‑end) unless an extension is filed.
The corporation files Form 1120‑S (including all K‑1s) with the IRS by mail or electronically through the Modernized e‑File (MeF) system. Shareholders receive a paper or electronic copy of their K‑1.
Incorrect amounts on a K‑1 cause shareholders to file wrong tax returns, which can trigger penalties, interest, or audit risk for both the corporation and the owners.
1. Gather the corporation’s year‑end financial statements. 2. Allocate income, deductions, and credits to each shareholder using the ownership percentages. 3. Complete Part II of Schedule K‑1 for each shareholder. 4. Attach all K‑1s to the corporation’s Form 1120‑S and file by the deadline. 5. Distribute copies to shareholders promptly.

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After you file

  1. 1Store the filed Form 1120‑S and all Schedule K‑1s in a secure location.
  2. 2Track when each shareholder receives their K‑1 copy.
  3. 3Monitor for any IRS notices referencing the corporate return.
  4. 4If a shareholder reports an error, prepare an amended K‑1 and file Form 1120‑S X.
  5. 5Update the shareholder ledger with any ownership changes for the next year.
  6. 6Retain supporting documents (profit‑loss, asset sale records) for audit purposes.

Sources

  • SRCIRS.gov Form 1120‑S Schedule K‑1 instructions2024 edition
  • SRCIRS Publication 542Corporations (covers S corporation filing deadlines)
  • SRCIRS Modernized e‑File (MeF) system guidelinesfiling method
  • SRCIRS Revenue Procedure on extensions for S corporationsdeadline rules
  • SRCIRS Instructions for Schedule K‑1data fields and required documents
  • SRCNot clearly stated in the provided official source

Common confusion points

K‑1 vs. 1099‑DIV

Both report dividend‑type income but K‑1 is for pass‑through entities

→ Verify entity type before using

Box 1 vs. Box 5 amounts

Box 1 is ordinary income; Box 5 is other income

→ Match to corporate income categories

Electronic vs. paper delivery

Shareholders may expect e‑copy but corporation files paper

→ Confirm delivery method with each shareholder

Extension filing

Extension moves corporate filing deadline but not shareholder distribution deadline

→ Communicate early to shareholders

Foreign tax credit reporting

Credit appears on K‑1 but must also be reported on Form 1116 by shareholder

→ Ensure credit is listed correctly

Workflow map

Related forms and next steps

4 signals

Before

Form 1120‑S (S corporation return)

Current

1120-SSK

After

Shareholder Form 1040 with Schedule E

Often used with

Schedule K‑1 (Form 1120‑S)

⚠ If something goes wrong

  • Form 1120‑S X (Amended return) and corrected Schedule K‑1

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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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