Who must sign Form 8879‑C?

An officer of the corporation who is authorized to sign the tax return (e.g., president, treasurer, CEO) must sign Form 8879‑C.

Can I use a handwritten signature on the fillable PDF?

Yes, you can draw a handwritten signature using the PDF filler’s signature tool, but the signature must be clear and legible.

Is Form 8879‑C required for every corporate e‑file?

Yes, any corporation that files its income‑tax return electronically must submit a signed Form 8879‑C as the electronic signature authorization.

What is the deadline for submitting Form 8879‑C?

Form 8879‑C must be signed and attached before the corporate tax return is transmitted electronically to the IRS, typically by the filing deadline (usually March 15 for calendar‑year corporations).

What should I do if I make a mistake after signing?

Correct the error on a new copy of Form 8879‑C, have the authorized officer re‑sign, and attach the updated form to the e‑filed return.

Do I need a separate Form 8879‑C for each state return?

State tax authorities may have their own signature forms. Form 8879‑C is only for the federal corporate return.

Is there a fee to use Formize’s PDF filler?

Formize offers a free, no‑cost option for filling out and downloading IRS forms like 8879‑C.

Where can I find the official instructions for Form 8879‑C?

The official IRS instructions are available at https://www.irs.gov/instructions/i8879c.

IRS Form 8879‑C – Fillable Corporate E‑File Signature Authorization

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IRS Form 8879‑C – Fillable Corporate E‑File Signature Authorization

Form 8879‑C, IRS E‑File Signature Authorization for Corporations, is the official document that authorizes the IRS to accept an electronically filed corporate income‑tax return (Form 1120, 1120‑S, 1120‑F, etc.). Instead of mailing a paper signature, corporations can sign electronically using this fillable PDF, saving time and reducing errors.

What is Form 8879‑C?

The form serves as a written declaration that the corporate officer signing the return has reviewed the return, the information is accurate, and the corporation authorizes the IRS to process the e‑filed return. It must be signed by an authorized officer (president, treasurer, or other corporate officer) and attached to the electronic filing.

How to Fill Out Form 8879‑C with Formize

Instead of downloading the PDF and opening a separate editor, simply click the "Fill out this form" button on this page. The Formize PDF Filler app will load instantly, letting you complete every field directly in your browser.

Step 1: Click the orange "Fill out this form" button.
Step 2: Wait a few seconds for the Formize app to load.
Step 3: Enter the corporation’s name, EIN, tax year, and other required data.
Step 4: Add the electronic signature of the authorized officer.
Step 5: Click "Save" to download the completed PDF, then attach it to your e‑filed return.

Common Mistakes & Tips for a Smooth Submission

Incorrect EIN: Double‑check the nine‑digit Employer Identification Number; a typo will cause the return to be rejected.
Wrong Tax Year: Use the calendar year or fiscal year that matches the corporate tax return you are filing.
Missing Signature: The form is invalid without a clear electronic signature. Use the built‑in signature field—do not draw a signature in a comment box.
Unsigned Attachments: If you file multiple returns (e.g., Form 1120‑S and Schedule K‑1), each must have its own Form 8879‑C signed.
Saving Errors: After completing the form, click "Download" to store a copy on your computer. Do not rely solely on the browser’s temporary cache.

Where to Find Help and Additional Resources

For detailed instructions, see the IRS Instructions for Form 8879‑C. If you have questions about eligibility, signing authority, or e‑file technical issues, visit the IRS Help & Resources page or contact your tax professional.

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FAQ

Who must sign Form 8879‑C?
An officer of the corporation who is authorized to sign the tax return (e.g., president, treasurer, CEO) must sign Form 8879‑C.
Can I use a handwritten signature on the fillable PDF?
Yes, you can draw a handwritten signature using the PDF filler’s signature tool, but the signature must be clear and legible.
Is Form 8879‑C required for every corporate e‑file?
Yes, any corporation that files its income‑tax return electronically must submit a signed Form 8879‑C as the electronic signature authorization.
What is the deadline for submitting Form 8879‑C?
Form 8879‑C must be signed and attached before the corporate tax return is transmitted electronically to the IRS, typically by the filing deadline (usually March 15 for calendar‑year corporations).
What should I do if I make a mistake after signing?
Correct the error on a new copy of Form 8879‑C, have the authorized officer re‑sign, and attach the updated form to the e‑filed return.
Do I need a separate Form 8879‑C for each state return?
State tax authorities may have their own signature forms. Form 8879‑C is only for the federal corporate return.
Is there a fee to use Formize’s PDF filler?
Formize offers a free, no‑cost option for filling out and downloading IRS forms like 8879‑C.
Where can I find the official instructions for Form 8879‑C?
The official IRS instructions are available at https://www.irs.gov/instructions/i8879c.

HOW TO

How to fill out Form 8879-C for free, online in 5 easy steps:

1
Open the Fillable Form
Click the orange "Fill out this form" button on this page. The Formize PDF Filler will load in a new window.
2
Enter Required Information
Complete the corporation’s name, EIN, tax year, and any other fields shown in the form.
3
Add Your Electronic Signature
Use the built‑in signature field to sign as the authorized corporate officer.
4
Save and Download
After all fields are filled, click "Save" to download the completed PDF to your computer.
5
Attach to Your E‑File
Upload the saved Form 8879‑C PDF with your e‑filed corporate tax return (Form 1120, 1120‑S, etc.).

ABOUT

Federal tax forms

Form 8879-C is one of Federal tax forms that are documents used to report and file federal income taxes with the Internal Revenue Service (IRS) in the United States. These forms are used by individuals, businesses, and organizations to report their income, deductions, and other relevant information necessary for calculating their federal tax liability.

The most commonly used federal tax form is the Form 1040, which is used by individual taxpayers to report their personal income tax. Other commonly used forms include the Form 1065 for partnerships, Form 1120 for corporations, and Form 990 for tax-exempt organizations.

Federal tax forms typically require taxpayers to report various sources of income, such as wages, salaries, and tips, as well as income from investments, rental properties, and other sources. The forms also allow taxpayers to claim deductions and credits for various expenses, such as charitable contributions, mortgage interest, and healthcare expenses.

It is important to file federal tax forms accurately and on time, as failure to do so can result in penalties and interest charges from the IRS.

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