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.