Fillable Tax Form K9 (IRS W‑9) – Complete Online

The Tax Form K9 is the commonly‑used nickname for the IRS Form W‑9, which requests a taxpayer’s name, address, and Taxpayer Identification Number (TIN). Whether you’re a freelancer, contractor, or a business needing a vendor’s TIN, this fillable PDF lets you complete the form quickly and securely.

What Is the Tax Form K9?

Form K9 (officially IRS Form W‑9) is used to:

• Collect the correct TIN for reporting payments on 1099‑MISC or 1099‑NEC.
• Certify that the TIN provided is accurate and that the payee is not subject to backup withholding.
• Maintain a record for your own tax filing purposes.

How to Fill Out the Form Online

Instead of downloading the PDF and opening a separate editor, simply click the "Fill out this form" button on this page. The Formize PDF Filler app will load in your browser, letting you type directly into each field.

Common Mistakes to Avoid

• Incorrect TIN format: Use a nine‑digit Social Security Number (SSN) or Employer Identification Number (EIN) without dashes.
• Leaving the certification box unchecked: The IRS requires your signature and date to certify the information.
• Out‑of‑date address: Double‑check that the mailing address matches the IRS records to prevent processing delays.

Where to Submit the Completed Form

After you finish, you can:

• Download the completed PDF and email it to the requester.
• Print and hand‑deliver the form.
• Save it securely for future reference.

Download the Original PDF

If you need the official, non‑fillable version, you can download it directly from the IRS:

IRS Form W‑9 (PDF)