Do I need to mail Form 8453‑C after I file electronically?

No. The form is retained electronically by the preparer. It is only required to be available for audit purposes.

Can I use a handwritten signature on the PDF?

Yes, you can upload an image of a handwritten signature or use the e‑signature field provided by the Formize filler.

How long must I keep the signed Form 8453‑C?

The California Franchise Tax Board requires you to keep the original signed form for at least three years.

What if the officer’s name changes after signing?

You must submit a new Form 8453‑C reflecting the current authorized officer’s name and signature.

Is Form 8453‑C required for all California corporate returns?

Yes, any corporation filing a California tax return electronically must attach a completed Form 8453‑C.

Can I fill out Form 8453‑C on a mobile device?

The Formize fillable PDF works on most modern smartphones and tablets. Use a browser that supports PDF editing.

Fillable Form 8453-C – California Corporate e‑File Authorization

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Fillable Form 8453-C – California Corporate e‑File Authorization

Form 8453‑C is the California Franchise Tax Board’s electronic filing authorization for corporations. It confirms that an authorized officer has reviewed and approved the e‑filed corporate tax return. Using a fillable PDF eliminates the need to print, sign, and mail a paper copy.

What Is Form 8453‑C?

This form is required for any corporation that files a California tax return electronically. It serves as the electronic signature and authorizes the state to accept the return. The form must be retained by the preparer for three years in case the FTB requests it.

How to Fill Out Form 8453‑C Online

Our Formize fillable PDF makes the process simple:

Click the "Fill out this form" button on this page.
Wait a few seconds while the Formize PDF Filler app loads.
Enter the corporation’s name, EIN, tax year, and other required details.
Provide the authorized officer’s signature using the built‑in e‑signature field.
Save the completed PDF directly to your device or cloud storage.

Common Mistakes to Avoid

Leaving the signature blank – the form is invalid without an electronic signature.
Mismatching dates – the date on the form must match the filing date in the CAELF screen.
Incorrect EIN or tax year – double‑check these numbers against the corporate return.

Where to Submit the Signed Form

Form 8453‑C is not mailed. The preparer retains the original PDF for three years and must make it available if the California Franchise Tax Board requests it. The electronic signature is accepted automatically when you file the return through approved tax‑software.

FAQs About Form 8453‑C

Answers to the most common questions are listed below. If you need more detail, consult the FTB publication 1345.

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FAQ

Do I need to mail Form 8453‑C after I file electronically?
No. The form is retained electronically by the preparer. It is only required to be available for audit purposes.
Can I use a handwritten signature on the PDF?
Yes, you can upload an image of a handwritten signature or use the e‑signature field provided by the Formize filler.
How long must I keep the signed Form 8453‑C?
The California Franchise Tax Board requires you to keep the original signed form for at least three years.
What if the officer’s name changes after signing?
You must submit a new Form 8453‑C reflecting the current authorized officer’s name and signature.
Is Form 8453‑C required for all California corporate returns?
Yes, any corporation filing a California tax return electronically must attach a completed Form 8453‑C.
Can I fill out Form 8453‑C on a mobile device?
The Formize fillable PDF works on most modern smartphones and tablets. Use a browser that supports PDF editing.

HOW TO

How to fill out Form 8453-C for free, online in 5 easy steps:

1
Open the Fillable Form
Click the "Fill out this form" button on the page. The Formize PDF Filler app will open in a new tab.
2
Enter Required Information
Complete all fields – corporation name, EIN, tax year, and officer details – exactly as they appear on the tax return.
3
Add an Electronic Signature
Use the built‑in signature box to draw or type the authorized officer’s signature. The date will auto‑populate.
4
Save and Store
Click "Save" to download the completed PDF. Keep the file for at least three years in case the FTB requests it.
5
Submit Your Return
File your corporate tax return through your e‑file software. The attached Form 8453‑C is automatically recognized.

ABOUT

Tax forms

Form 8453-C is one of Tax forms that are documents used to report information about an individual's or business's income, deductions, and tax liability to the relevant tax authority. These forms are necessary to comply with tax laws and fulfill tax obligations. Tax forms vary depending on the country and the specific tax requirements in place. Here are some common types of tax forms:

Individual Tax Forms: These forms are used by individual taxpayers to report their personal income and claim deductions, credits, and exemptions. Examples include the 1040 form in the United States or the Self-Assessment Tax Return form in the United Kingdom.

Business Tax Forms: Business tax forms are used by companies, partnerships, or self-employed individuals to report their business income, expenses, and other tax-related information. Examples include the Schedule C form (Profit or Loss from Business) in the United States or the CT600 form (Company Tax Return) in the United Kingdom.

Payroll Tax Forms: These forms are used by employers to report the wages, salaries, and taxes withheld from their employees' paychecks. Examples include the W-2 form in the United States or the P60 form in the United Kingdom.

Sales Tax Forms: Sales tax forms are used by businesses to report and remit sales tax collected on taxable goods or services. The specific sales tax forms vary by jurisdiction.

Value Added Tax (VAT) Forms: VAT forms are used in countries that impose a value-added tax to report and remit VAT collected on sales and claim VAT credits for purchases. Examples include the VAT return forms used in many countries.

Estimated Tax Forms: Estimated tax forms are used to report and pay estimated taxes on income that is not subject to withholding, such as self-employment income or investment income.

These are just a few examples of the numerous tax forms that may exist. The specific forms required depend on the tax laws and regulations in your country or jurisdiction. It is important to consult the tax authority's guidelines or seek professional advice to determine which forms are applicable to your situation.

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