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Form 1120-S
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Form 1120-S

2025
Trusted by accountants
Trusted by accountants
Official IRS form
Official IRS form
Filed annually
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.

Form 1120-S

2025
Form 1120-S
Fill Form
Trusted by accountants
Trusted by accountants
Official IRS form
Official IRS form
Filed annually
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.

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.

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.

How to Get Your Form 1120-S

  1. Open the printable Form 1120-S1

    Open the printable Form 1120-S

  2. Fill it out with the required information2

    Fill it out with the required information

  3. Download Form 1120-S to your device3

    Download Form 1120-S to your device

#1. How do I get a blank Form 1120-S?

You can get a blank Form 1120-S from pdf.net or the official IRS website. Both can be easily opened in our PDF editor, where you can type all the required information directly into the designated slots.

#2. Can I submit Form 1120-S electronically?

Yes, you can submit Form 1120-S electronically and are, in fact, required to do so if you’re filing 10 or more returns of any type in a calendar year. Exceptions can be made if you submit a waiver and demonstrate that e-filing would cause you difficulties.

#3. What if my Form 1120-S is missing information?

If your Form 1120-S is missing information, complete a new one and submit it as soon as possible to avoid penalties. On the new form, check box 4 (Amended return) on line H, provide an accompanying statement for each amended item, and issue corrected Schedule K-1s to each shareholder reflecting the changes. To avoid all this hassle, make sure to use a Form 1120-S example as a guide when filling out your form.

#4. Can I fill out my Form 1120-S online?

Yes, you can fill out your Form 1120-S online using our PDF editor, which allows you to type information directly into the empty slots.

#5. Is this form free?

This form is free to view and edit, but you can only download it if you register for an account. Check out our pricing page for more information.

#6. Can I correct mistakes on Form 1120-S? 

Yes, you can correct mistakes on Form 1120-S by filing an amended return, as described above in the missing information question. The process is essentially the same: complete a new form, tick the box, and provide the required statements.

#7. How long does it take to process Form 1120-S?

Form 1120-S processing time varies based on IRS workload, whether the return was e-filed or mailed, and whether additional review is needed.

#8. What is the difference between a 1040 and a 1120-S?

The difference between a 1040 and a 1120-S is that the former is the U.S. individual income tax return, while the latter is the income tax return for S corporations. Furthermore, 1040 determines the tax an individual owes, while 1120-S acts as an information return, since S corporations don’t pay income taxes directly. Instead, this liability passes through to the shareholders.

#9. Is Form 1120-S the same as a K1?

No, Form 1120-S isn’t the same as a K-1, even though the two forms are connected. Essentially, Form 1120-S is the principal form for reporting an S corporation’s income tax, while a K-1 is a schedule issued to each shareholder to help them complete their individual income tax returns.