What is the purpose of Form 8879‑C?

Form 8879‑C authorizes the IRS to accept an electronic signature for a corporation’s income tax return, confirming that the responsible officer has reviewed and approved the return.

Who can sign Form 8879‑C for a corporation?

A corporate officer who is authorized to sign the tax return—typically the president, CEO, treasurer, or any officer with signing authority—must sign the form.

Can I use Formize on a mobile device?

Yes. The Formize PDF Filler works in modern browsers on smartphones and tablets, allowing you to complete and sign Form 8879‑C on‑the‑go.

Is the electronic signature legally binding?

Yes. The IRS accepts electronic signatures on Form 8879‑C as long as the signer follows the required authentication steps provided by the PDF filler.

What if I make a mistake after signing?

If you discover an error after signing, you must correct the mistake, re‑sign the form, and submit the updated version. Do not use the previously signed PDF.

Do I need to print the form after filling it online?

No. The signed PDF can be saved digitally and attached to your e‑file submission. Printing is only necessary if your tax preparer specifically requests a hard copy.

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

The official instructions are included on the back of the PDF provided by the IRS and can also be accessed on the IRS website under the Form 8879‑C page.

Fillable Form 8879‑C (Corporation) – Sign Online Instantly

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Fillable Form 8879‑C (Corporation) – Sign Online Instantly

Form 8879‑C, also known as the IRS e‑file Signature Authorization for corporate tax returns, allows a corporation to authorize the electronic filing of Form 1120, 1120‑S, or 1120‑F. Using our fillable PDF, you can complete, sign, and save the form without any extra software.

What Is Form 8879‑C?

This form serves as the electronic signature authorization for a corporation’s income tax return. It confirms that the corporation’s responsible officer has reviewed the return and consents to e‑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 below. The Formize PDF Filler app will load directly in your browser, letting you type, select dates, and add an electronic signature.

Common Mistakes to Avoid

Leaving the Signature field blank – the form is invalid without a signature.
Entering an incorrect Employer Identification Number (EIN).
Using an outdated tax year on the form.
Forgetting to attach the signed form to the corresponding Form 1120 series.

Where to Submit Your Signed Form

After you finish, download the completed PDF and attach it to your e‑file submission through your tax software or send it to your tax preparer. The IRS does not accept paper copies of Form 8879‑C for electronic filings.

Need More Help?

Review the IRS instructions on the back of the form or consult a qualified tax professional. The Formize platform provides a smooth, secure environment for completing IRS forms online.

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FAQ

What is the purpose of Form 8879‑C?
Form 8879‑C authorizes the IRS to accept an electronic signature for a corporation’s income tax return, confirming that the responsible officer has reviewed and approved the return.
Who can sign Form 8879‑C for a corporation?
A corporate officer who is authorized to sign the tax return—typically the president, CEO, treasurer, or any officer with signing authority—must sign the form.
Can I use Formize on a mobile device?
Yes. The Formize PDF Filler works in modern browsers on smartphones and tablets, allowing you to complete and sign Form 8879‑C on‑the‑go.
Is the electronic signature legally binding?
Yes. The IRS accepts electronic signatures on Form 8879‑C as long as the signer follows the required authentication steps provided by the PDF filler.
What if I make a mistake after signing?
If you discover an error after signing, you must correct the mistake, re‑sign the form, and submit the updated version. Do not use the previously signed PDF.
Do I need to print the form after filling it online?
No. The signed PDF can be saved digitally and attached to your e‑file submission. Printing is only necessary if your tax preparer specifically requests a hard copy.
Where can I find the official IRS instructions for Form 8879‑C?
The official instructions are included on the back of the PDF provided by the IRS and can also be accessed on the IRS website under the Form 8879‑C page.

HOW TO

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

1
Click the Fill Out Button
Press the “Fill out this form” button on this page. The Formize PDF Filler will open in a new tab.
2
Enter Your Information
Type directly into each field. The form automatically validates dates, numbers, and EIN formats.
3
Add Your Electronic Signature
Use the built‑in signature pad or upload a scanned signature image. The signature is saved securely to the PDF.
4
Save or Download
When all fields are complete, click “Save” to store the file in your Formize account or “Download” to get a copy for your records.
5
Submit with Your Tax Return
Attach the signed Form 8879‑C to your corporate tax return (Form 1120, 1120‑S, or 1120‑F) when you e‑file.

ABOUT

Internal Revenue Service (IRS) Forms

Form 8879-C is one of the official tax forms used in the United States to report income, claim deductions and credits, calculate tax liability, and fulfill other tax-related obligations. The IRS is the federal agency responsible for administering and enforcing the internal revenue laws in the United States.

Here are some examples of Internal Revenue Service forms:

Form 1040: This is the primary individual income tax return form used by most taxpayers. It is used to report various types of income, claim deductions and credits, calculate tax liability, and determine whether a taxpayer owes additional tax or is entitled to a refund.

Form 1099: There are different variations of Form 1099, such as 1099-MISC, 1099-INT, 1099-DIV, etc. These forms are used to report income received by individuals or businesses from various sources other than employment, such as self-employment income, interest income, dividend income, and rental income.

Form W-2: This form is used by employers to report wages paid to employees and the taxes withheld from their pay. Employees use the information on Form W-2 to complete their individual tax returns.

Form 941: Employers use this form to report employment taxes, including federal income tax withheld, Social Security tax, and Medicare tax, for their employees.

Form 1065: This form is used by partnerships to report their income, deductions, and tax liability. Partnerships themselves do not pay income tax; instead, the partners report their share of partnership income on their individual tax returns.

Form 1120: This is the corporate income tax return form used by C corporations to report their income, deductions, and tax liability.

Form 990: This form is used by tax-exempt organizations, such as nonprofits and charities, to report their financial information, activities, and compliance with tax laws.

Form 8862: This form is used by taxpayers who previously claimed the Earned Income Tax Credit (EITC) but had it disallowed, and now want to claim it again.

These are just a few examples of the numerous IRS forms that exist to fulfill various tax-related obligations. The specific forms required for an individual or business depend on their unique circumstances, income sources, and deductions. It's advisable to consult the official website of the Internal Revenue Service (www.irs.gov) or seek professional tax advice to obtain accurate and up-to-date information regarding the specific IRS forms relevant to your tax situation.

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