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What Is Form W-9 and Why Is It Needed?

Form W-9, "Request for Taxpayer Identification Number and Certification," collects your legal name and Taxpayer Identification Number (TIN) for tax reporting purposes. It allows businesses to issue correct 1099 tax forms to the IRS.

Official IRS Resources: Download Form W-9 | Official Instructions

What is a W-9?

It is an information-collection form, not a tax return. A business (“the requester”) asks a payee to provide:

  • Legal name and business name
  • Federal tax classification
  • Address
  • TIN (SSN or EIN)
  • A signed certification of accuracy

Why do businesses need this?

Businesses are often legally required to report payments of $2,000 or more annually to independent contractors, vendors, or landlords via Form 1099 to the IRS. The W-9 provides the necessary name and TIN to complete these 1099 filings accurately and ensure compliance.

Is the W-9 sent to the IRS?

No. You provide the completed W-9 only to the requester. They keep it for their records to generate 1099s; the IRS does not receive the W-9 directly.

What if I refuse or provide incorrect information?

Providing inaccurate information or refusing to submit the form may lead to payment holds and account compliance issues. Mismatched information may also trigger an IRS "TIN mismatch" notice (CP2100).

When should I update my W-9?

Update your W-9 only when your details change—such as a legal name change, a change in business structure (e.g., forming an LLC), a new address, or a new TIN. While there is no fixed expiration, many businesses may request updated forms periodically to ensure their records remain current.

Where can I go for more information?

This FAQ is intended to be informational and not a comprehensive guide for the use of the W9 form. Please consult the IRS (Official Instructions) or your tax advisor for more information directly applicable to your business and any best practices.