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IRSCorporate Tax (1120 Series)

Official form guide

Form 1120-PC: 1120-PC

Form 1120-PC is the U.S. Corporation Income Tax Return for Personal Service Corporations. File it to report income, deductions, and calculate tax for a corporation that primarily performs personal services.

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Form Overview

IRS Form 1120-PC - 1120-PC

Form 1120-PC is the U.S. Corporation Income Tax Return for Personal Service Corporations. File it to report income, deductions, and calculate tax for a corporation that primarily performs personal services.

It captures gross receipts, allowable expenses, taxable income, and the flat 21% corporate tax for PSCs.

Risk Radar

Scan points
  • 1A single mis‑entered expense line can cause a penalty and interest.
  • 2Misclassifying a corporation as a PSC when it isn’t
  • 3Using the wrong tax rate (21% vs regular corporate brackets)
  • 4Omitting required Schedule K‑1 for shareholders
  • 5Failing to attach Schedule M‑3 when required

Plain English

If your company is a personal service corporation—like a law firm, medical practice, or consulting firm—you report its earnings on this return. The form works like a regular corporate tax return but uses special rules for service‑based income.

Submission Date

  • Filing date: 2026-01-28 16:10:39
  • 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 taxmedicalincomegross

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What this form is for

  • Use when the corporation meets the PSC definition (≥ 95% of income from personal services).
  • Do not use for regular C‑corporations that are not PSCs.
  • If unsure, check Form 1120 or Form 1120‑S first.

Form selector

Use this form or another form?

Corporation not a PSC

Regular corporate tax rates apply

✓ Verify service‑income percentage

Form 1120

S‑corporation with personal services

Pass‑through taxation

✓ Confirm S‑corp election status

Form 1120‑S

Non‑profit providing services

Tax‑exempt filing

✓ Ensure 501(c)(3) status

Form 990

Deadline or filing window

The return is due by the 15th day of the fourth month after the corporation’s tax year ends (April 15 for calendar‑year filers). If the deadline falls on a weekend or holiday, the due date shifts to the next business day. Extensions can be requested using Form 7004, extending the filing deadline by six months.

  • —Gross receipts | sum of all income lines | Taxable income before deductions | Verify inclusion of all service revenue

Checklist

What you need before filling it out

1

Line 1 – Gross receipts

Sales invoices, service contracts · Income statements

⚠ Often omitted cash refunds✕ Medium
2

Line 12 – Deductions

Receipts, payroll records · Expense ledger

⚠ Mis‑classifying personal expenses as business✕ High
3

Schedule K‑1

Shareholder allocation info · Corporate minutes, ownership ledger

⚠ Missing shareholder IDs✕ Medium
4

Schedule M‑3

Reconciliation of book to tax income · Accounting trial balance

⚠ Failure to attach when required✕ High

Before you submit

  1. 1Confirm corporation qualifies as a PSC (≥95% personal service income).
  2. 2Verify tax year matches the filing period on the form.
  3. 3Reconcile book income to tax income on Schedule M‑3 if required.
  4. 4Calculate tax using the flat 21% rate.
  5. 5Attach all required schedules (K‑1, M‑3, etc.).
  6. 6Ensure the authorized officer’s signature and title are present.
  7. 7Enter correct EIN, address, and contact information.
  8. 8Check that the filing method (e‑file or mail) matches the chosen submission.
  9. 9If filing by mail, use the correct IRS address for the corporation’s state.
  10. 10Retain a copy of the signed return and all supporting documents.
  11. 11Confirm payment (if any) is included or electronic payment is authorized.
  12. 12Record the filing confirmation number or certified mail receipt.

How to file this form

  1. 1Gather financial statements and supporting documents.
  2. 2Complete Form 1120‑PC line‑by‑line using the instructions.
  3. 3Prepare and attach required schedules (K‑1, M‑3, etc.).
  4. 4Run a final review for arithmetic errors and required signatures.
  5. 5Submit electronically via IRS MeF or mail the paper return to the appropriate address.
  6. 6Save the electronic acknowledgment or certified mailing receipt.
  7. 7Note the filing date for future reference.

Known limitations

  1. 1Instructions may reference tax law changes that are not reflected until the next edition.
  2. 2Electronic filing requires compatible tax software; not all providers support Form 1120‑PC.
  3. 3The form does not calculate state corporate taxes; separate state filings may be needed.
  4. 4Schedule M‑3 is required only for corporations with assets ≥ $10 million or gross receipts ≥ $10 million.

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

Form 1120‑PC is currently in its 2024 edition. The IRS has not announced any pending revisions for the 2025 filing year.

What changed or needs a fresh check

  • Edition date: 2024
  • Fee: None (no filing fee for electronic or paper filing)
  • Mailing address: See IRS instructions for state‑specific address
  • Electronic filing: Available via IRS Modernized e‑File (MeF)
  • Signature requirement: Authorized corporate officer must sign
  • Attachments: Schedule M‑3, Schedule K‑1, etc., as applicable

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Form 1120-PC page 1

Page 1

Form 1120-PC page 2

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Quick Facts

Personal service corporations (PSC) organized under U.S. law must file.
It captures gross receipts, allowable expenses, taxable income, and the flat 21% corporate tax for PSCs.
The return is due by the 15th day of the 4th month after the corporation’s tax year ends (generally April 15 for calendar‑year filers).
File electronically through the IRS e‑file system or mail the paper form to the IRS address listed in the instructions for the corporation’s state.
Errors can trigger penalties, interest, or an audit because the flat tax rate and expense limitations are strictly enforced for PSCs.
Gather year‑end financial statements, compute ordinary business income, apply PSC‑specific deductions, fill the taxable income section, calculate 21% tax, and attach any required schedules. Review the form line‑by‑line against the instructions, then sign and file electronically or by mail.

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After you file

  1. 1Store the signed return and all attachments for at least seven years.
  2. 2Record the IRS acknowledgment number or certified mail receipt.
  3. 3Monitor the corporation’s account for any IRS notices or adjustments.
  4. 4Pay any tax due by the deadline if not already paid electronically.
  5. 5Update the corporate accounting system to reflect the tax expense.
  6. 6If an extension was filed, track the new extended deadline.
  7. 7Prepare for possible state corporate tax filings based on the federal return.

Sources

  • SRCIRS Form 1120‑PC instructionsdefinition of Personal Service Corporation
  • SRCIRS Publication 542Corporations – confirms 21% flat tax rate for PSCs
  • SRCIRS Form 7004Extension of Time to File – deadline extension rules
  • SRCIRS Modernized e‑File (MeF) systemelectronic filing availability
  • SRCIRS Schedule M‑3 instructionsasset and receipt thresholds
  • SRCIRS Schedule K‑1 (Form 1120‑PC)shareholder reporting requirements
  • SRCIRS mailing addressesfound in Form 1120‑PC instructions by state

Common confusion points

PSC definition

Misunderstanding the 95% service‑income threshold

→ Review revenue breakdown before filing

Flat 21% rate vs graduated rates

Assuming regular corporate brackets apply

→ Apply 21% on taxable income

Schedule M‑3 requirement

Not sure if assets/revenue trigger it

→ Check balance sheet totals

Signature authority

Using an employee instead of officer

→ Verify officer title and signing power

Electronic vs paper address

Using the wrong state address

→ Follow the IRS instruction sheet

Extension filing

Filing Form 7004 on the wrong form

→ Submit Form 7004 separately before the original deadline

Shareholder K‑1 allocation

Incorrectly allocating income

→ Reconcile with corporate ownership percentages

Workflow map

Related forms and next steps

5 signals

Before

Form 2553 (S‑corp election) if corporation is not a PSC

Current

1120-PC

After

State corporate tax return (varies by state)

Often used with

Schedule K‑1 (Form 1120‑PC) for shareholder allocationsSchedule M‑3 (Form 1120‑PC) for large corporations

⚠ If something goes wrong

  • Form 1120‑X (Amended U.S. Corporation Income Tax Return) to correct errors

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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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