IRS Form W‑12 – Fillable PDF Online

The IRS Form W‑12 (Request for Taxpayer Identification Number and Certification) is the official document used by payors to request a Taxpayer Identification Number (TIN) from individuals or entities that will receive reportable payments. With Formize.com you can fill out this form directly in your browser—no printing, scanning, or PDF editor required.

What Is IRS Form W‑12?

Form W‑12 is issued by the Internal Revenue Service (IRS) to collect the correct TIN and certification for backup withholding purposes. It is commonly used by businesses, financial institutions, and government agencies when they need to verify the recipient’s TIN before issuing a Form 1099, 1098, or other information returns.

How to Complete the Fillable Form

Follow these simple steps to fill out the form online:

• Click the "Fill out this form" button on this page.
• Wait a few seconds while the Formize PDF Filler app loads.
• Enter the required information in each field (name, address, TIN, etc.). The form automatically validates formats such as SSN/EIN.
• Review your entries, then click Submit to download the completed PDF or to print it directly.

Common Mistakes to Avoid

• Incorrect TIN format: Ensure the Social Security Number (SSN) is entered as XXX-XX-XXXX and the Employer Identification Number (EIN) as XX-XXXXXXX.
• Missing signature: The form requires an authorized signature; the online filler includes a signature field that can be typed and saved.
• Out‑of‑date address: Verify the mailing address matches the IRS records to prevent backup withholding.

Where to Submit the Completed Form

After completing the fillable PDF, you can:

• Attach it to your electronic filing system and send it to the requesting payor.
• Print and mail it to the IRS or the requesting entity, using the address indicated on the form.

Formize keeps a copy of your completed PDF for up to 30 days, so you can download it again if needed.

FAQs About Form W‑12

For quick answers, scroll down to the FAQ section below.