# Form 1120-S

URL: https://pdf.net/pdf-forms/tax-forms/form-1120-s
Category: Tax Forms
Attributes: Trusted by accountants, Official IRS form, Filed annually

Form 1120-S is used to report income, gains, losses, deductions, credits, and other tax-related information of a domestic corporation or a different entity that is elected to be an S corporation.

Our editable Form 1120-S streamlines the entire filing process. Complete it online according to the instructions and submit it to the IRS as part of your tax obligations.

## Versions

- 2025 — [download PDF](https://cdn.sanity.io/files/i16te7yp/production/f7f159e83cbe905f9d70214594aa6ec5d99a1eb7.pdf)

## How to Fill Out Form 1120-S

1. Open Form 1120-S in our PDF editor.
2. Enter the S corporation’s information and the number of shareholders.
3. Complete sections about income, deductions, tax, and payments according to the Form 1120-S instructions.
4. If necessary, fill out the schedules under the form with additional information.
5. Attach Schedule K-1 for each shareholder.
6. Submit the package to the IRS.

## Facts

### What Is Form 1120-S Used For?

Form 1120-S is used to report gains, losses, income, credits, and deductions of an entity that is elected to be an S corporation. This election is completed by filing Form 2553, which must be approved by the IRS to become valid.

### Who Should Use Form 1120-S?

All corporations and entities that elected to become S corporations should use Form 1120-S to fulfill their tax-related obligations. However, it’s important not to file this form if you haven’t received a confirmation that Form 2553 was accepted. If two months have passed since you filed it and you still have no answer, contact the IRS.

### When Is Form 1120-S Due?

Form 1120-S due date is by the 15th day of the 3rd month after the end of the S corporation’s tax year. For calendar year corporations, this is March 15th annually. However, if this date falls on a weekend or a national holiday, the deadline is pushed to the next business day.

### What Happens If Form 1120-S Is Not Submitted?

If Form 1120-S isn’t submitted, your corporation will face late filing penalties. These are as follows:

- If no tax is due on a return, $255 for each month or part of the month the return is late, multiplied by the total number of shareholders for that tax year
- If tax is due, the amount stated above, plus 5% of the unpaid tax for each month or part of the month the return is late, up to a maximum of 25%

### How and Where Do I File the Form 1120-S?

You should file Form 1120-S with the IRS, using one of the addresses provided on the official website or the e-filing portal. If you must submit 10 or more returns of any type in a calendar year, you are required to do so electronically, unless you submit a waiver.