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  1. Home
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  4. USA
  5. Taxes
  6. Form 8879-C

IRS Form 8879‑C – Fillable PDF for Corporate Tax Signature

  1. Country USA
  2. Language English
  3. Activity Taxes
  4. Department Internal Revenue Service
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IRS Form 8879‑C – Fillable PDF for Corporate Tax Signature

IRS Form 8879‑C – Fillable PDF for Corporate Tax Signature

What Is Form 8879‑C?

Form 8879‑C, IRS e‑File Signature Authorization for Form 1120, is the electronic signature worksheet that corporations use to authorize the electronic filing of their corporate income tax return (Form 1120). The form confirms that the corporate officer or authorized person has reviewed the return and consents to its electronic submission.

How to Fill Out Form 8879‑C Online

Instead of downloading the PDF and opening it in a separate editor, simply click the "Fill out this form" button on this page. The Formize PDF Filler app will load in your browser, allowing you to complete every field, add your electronic signature, and save or submit the document—all without leaving the site.

Common Mistakes to Avoid

  • Incorrect EIN: Double‑check the Employer Identification Number; a typo will delay processing.
  • Missing Signature: The form is invalid without a valid electronic signature from an authorized officer.
  • Wrong Tax Year: Ensure the tax year matches the accompanying Form 1120.
  • Incomplete Contact Info: Provide a current phone number and email; the IRS may need to reach you.

Where to Submit the Signed Form

After you finish, download the completed PDF and attach it to your e‑file submission in the tax software you are using. If you are filing manually, mail the signed Form 8879‑C to the address listed in the Form 1120 instructions.

Need Assistance?

The IRS provides detailed instructions on the form itself. For any uncertainties, consult a qualified tax professional. Remember, Formize does not offer live support, but the built‑in help tips in the filler guide you through each field.

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FAQ

  • Who can sign Form 8879‑C?

    An authorized corporate officer (e.g., president, treasurer, or CFO) who has the legal authority to sign the corporation’s tax return may sign Form 8879‑C.

  • Do I need a notary for the electronic signature?

    No. The IRS accepts electronic signatures on Form 8879‑C without notarization, provided the signer is authorized.

  • Can I use Form 8879‑C for an S corporation?

    Form 8879‑C is for Form 1120 (C‑corporation). S corporations use Form 8879‑S.

  • What happens if I submit the form with an incorrect EIN?

    The IRS will reject the submission and request a corrected form, which can delay processing of your corporate return.

  • Is there a fee to use the Formize PDF Filler?

    Formize offers a free basic filler for most IRS forms, including Form 8879‑C. Premium features may have a fee, but the basic signing functionality is free.

  • Can I edit the form after I’ve saved it?

    Yes. Open the saved PDF in Formize again or any compatible PDF editor to make additional changes before final submission.

  • Do I need to print the form after signing electronically?

    Printing is optional. For pure electronic filing, a digital copy is sufficient. Print only if your tax software requires a hard copy.

HOW TO

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

  1. 1
    Click the Fill‑Out Button
    Press the "Fill out this form" button on the page. The Formize PDF Filler app opens instantly in your browser.
  2. 2
    Enter Required Information
    Complete each field—EIN, tax year, corporate officer name, and contact details—using your keyboard or touch screen.
  3. 3
    Add Your Electronic Signature
    Use the signature tool to draw or type your authorized signature. The app validates the signature format automatically.
  4. 4
    Save or Export the Completed PDF
    When all fields are filled, click "Save" to download the signed PDF to your computer or device.
  5. 5
    Attach to Your E‑File
    Upload the saved PDF to your tax software’s e‑file attachment section, or print and mail it if filing by paper.
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ABOUT

Tax forms

Form 8879-C is one of Tax forms that are documents used to report income, deductions, and tax liability to the relevant tax authority. These forms are an essential part of the tax filing process and are used to ensure individuals and businesses comply with tax laws and accurately calculate their tax obligations.

The specific tax forms required can vary depending on factors such as an individual's filing status, sources of income, and the country's tax laws. However, here are some common types of tax forms:

Individual Income Tax Forms: These forms, such as the 1040 series in the United States, are used by individuals to report their income, claim deductions and credits, and calculate their tax liability.

Business Tax Forms: Businesses, including sole proprietorships, partnerships, corporations, and self-employed individuals, may have to file various forms to report their income, expenses, and taxes owed. Examples include Schedule C (Profit or Loss from Business) and Form 1120 (U.S. Corporation Income Tax Return).

Employment Tax Forms: Employers are required to report employee wages and withhold and remit payroll taxes. Forms such as W-2 (Wage and Tax Statement) and 941 (Employer's Quarterly Federal Tax Return) are used for this purpose.

Investment and Retirement Account Forms: These forms are used to report investment income, capital gains, and losses, as well as contributions and distributions from retirement accounts. Examples include Form 1099-DIV (Dividends and Distributions) and Form 5498 (IRA Contribution Information).

Estate and Gift Tax Forms: When a person passes away or makes significant gifts, specific forms such as Form 706 (United States Estate (and Generation-Skipping Transfer) Tax Return) and Form 709 (United States Gift (and Generation-Skipping Transfer) Tax Return) are used to report and calculate any applicable estate or gift taxes.

It is important to note that tax laws and forms can change over time, so individuals and businesses should consult the relevant tax authority or seek professional tax advice to ensure compliance with the current requirements.

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