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Resources / Tax Tips · 2 min read

Understanding the Differences Between Form 1120-S and Form 1040

Filing taxes for an S Corporation? Learn how 1120 S works, its role in self-employment tax, and how it compares to Form 1040 and Schedule K-1.

Understanding the Differences Between Form 1120-S and Form 1040
Collective Editorial Team
Written by Collective Editorial Team
Published Dec 10, 2024
On this page 9 sections
  1. What is Form 1120-S?
  2. S Corp as a Pass-Through Entity
  3. Shareholder Wages and Distributions
  4. Schedule K-1: Your Personal Piece of the Pie
  5. What’s Form 1040?
  6. About Self-Employment Tax
  7. Entities vs. Individuals
  8. Separate Filings
  9. Tax Filing Deadlines

AI Summary

AI-generated from this article. Not tax advice.

  • Form 1120-S reports an S Corp's annual income, gains, losses, deductions, and credits and how they split among shareholders, while Form 1040 is your personal federal income tax return.
  • An S Corp is a pass-through entity: the corporation itself doesn't pay income taxes, so profits or losses pass through to individual shareholders who report their shares personally.
  • Each shareholder gets a Schedule K-1 (Form 1120-S) breaking down their share of income, deductions, and credits, which you need before filing Form 1040.
  • Form 1120-S must be filed first because your personal return needs the Schedule K-1; you typically have about another month to file Form 1040 afterward.

What you need to know

As tax season approaches, we want to make sure you’re well-prepared for your tax obligations. If you own an S Corp, there are a few key things you need to know about the tax forms required. One of the most important points is that you can’t file your personal tax return (Form 1040) until your S Corp tax return (Form 1120-S) is done.

Let’s dive into the reasons why and explore the differences between these forms.

Form 1120-S: S Corporation Tax Return

What is Form 1120-S?

Form 1120-S is the tax form your S Corp uses to report its annual income, gains, losses, deductions, and credits. It tells the IRS how the corporation’s income is split among its shareholders.

S Corp as a Pass-Through Entity

An S Corp is a pass-through entity, meaning the corporation itself doesn’t pay income taxes. Instead, the profits or losses pass through to you, the individual shareholders, who then report your shares on your personal tax returns.

Shareholder Wages and Distributions

If you work in your S Corp, you probably get a salary, which is taxed like any regular job income. Additionally, you might receive distributions from the company’s profits. These distributions aren’t treated like salary, so they’re typically not subject to employment taxes.

Schedule K-1: Your Personal Piece of the Pie

Each shareholder gets a Schedule K-1 (Form 1120-S), which breaks down your specific share of the company’s income, deductions, and credits. You’ll need this completed form when you’re ready to file your personal tax return (Form 1040) to report everything accurately.

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Form 1040: Your Personal Tax Return

What’s Form 1040?

Form 1040 is the standard federal income tax form used by individuals to report all the money you’ve made during the year. This includes your salary, income from side gigs, investments, and any other sources. If you’re part of an S Corp, you’ll also include what you’ve earned from there too.

About Self-Employment Tax

If you’re getting paid from your S Corp (like a salary), this income is treated just like any job income. You’ll pay regular taxes, like Social Security and Medicare, on it.

In Summary

Entities vs. Individuals

Remember, Form 1120-S is for the corporate entity (your S Corp), while Form 1040 is for your personal taxes. To file your personal taxes, you need to first complete your S Corp tax return.

Separate Filings


You must file your business and personal returns separately.

Tax Filing Deadlines


Keep an eye on the different filing deadlines. Form 1120-S comes first because your personal return needs the Schedule K-1. Typically, you’ll have about another month to file Form 1040 after completing Form 1120-S.

Our website contains general information only and this information is not to be taken as legal, tax, or financial advice. You should consult with your attorney and/or tax advisor to get answers to your specific questions.

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About the author

Collective Editorial Team

Collective Editorial Team

The Collective Editorial Team is made up of writers, editors, and subject matter experts covering everything solopreneurs deal with — from tax, bookkeeping, and business formation to marketing, growing revenue, and the everyday realities of running a business solo. The team works closely with self-employed business owners to understand what they're actually navigating, and for technical content, leverages authoritative tax and regulatory sources to keep it accurate and current.

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