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Answers · S corporations

What Is Form 1120-S?

Form 1120-S reports an S corporation’s income, deductions, balance-sheet information, taxes where applicable, and shareholder allocations.

Reviewed August 2026 · Mint Associates Ltd Co · Houston, Texas

How it works

The rule, and what it turns on.

A reliable return should reconcile books, payroll, assets, loans, distributions, contributions and basis- related information.

Example

$750,000 revenue less $500,000 ordinary deductions can produce $250,000 ordinary income before separately stated items.

Common mistakes

What we see go wrong, and what we do instead.

  • Preparing from P&L only.
  • Ignoring shareholder loan/equity reconciliation.

A better approach

  • Use a year-end tax-prep checklist tied to the trial balance.

Authority

Where this comes from, so you can check it.

IRC §§1361-1379; Form 1120-S and instructions.

Educational information, not individualized tax advice. Treatment depends on your facts, entity classification and tax year, and IRS instructions change. Confirm your own position with us before relying on it. Mint Associates does not provide legal services.

Also asked

The same question, the other ways people put it.

  • How to Prepare Your Books for Form 1120-S

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