A W-9 is an IRS form titled “Request for Taxpayer Identification Number and Certification.” Businesses use it to collect a vendor’s or contractor’s tax identification information before making payments to them. When you hire a freelancer, pay an independent contractor, or work with a vendor as a non-employee, you’ll typically need a completed W-9 from them before issuing payment: or at minimum before you issue a 1099 at year-end.
The W-9 itself is never submitted to the IRS. It’s collected and kept on file by the business that requested it, then used to complete Form 1099-NEC (or other 1099 variants) when the time comes to report payments to the IRS.
What Information Does a W-9 Collect?
A W-9 collects the following information from the payee:
- Name: Legal name of the individual or business entity
- Business name: If different from the legal name (e.g., DBA)
- Federal tax classification: Sole proprietor, single-member LLC, C-corp, S-corp, partnership, trust, or other
- Exemption codes: For entities exempt from backup withholding
- Address: Where the 1099 should be mailed
- Taxpayer Identification Number (TIN): Either a Social Security Number (SSN) for individuals or an Employer Identification Number (EIN) for businesses
- Certification signature: The payee certifies their TIN is correct and they are not subject to backup withholding
When Do You Need a W-9?
As a business owner, you need a W-9 from any non-employee individual or business to whom you pay $600 or more during a tax year for services rendered. This includes independent contractors, freelancers, attorneys, and accountants. You should request the W-9 before or at the time of first payment: don’t wait until January when you’re scrambling to file 1099s.
If you are the one being hired as a freelancer or contractor, expect to be asked to fill out a W-9 before or shortly after you begin working. Providing it promptly is professional practice and keeps your client relationship clean.
Failing to collect W-9s when required can result in being required to withhold 24% of payments (backup withholding) and may result in IRS penalties for failure to file required 1099s.
W-9 vs. W-4: What’s the Difference?
A W-4 is completed by employees for withholding purposes. A W-9 is completed by independent contractors and vendors. If someone fills out a W-4 for you, you’re treating them as an employee and must withhold payroll taxes. If they fill out a W-9, you’re treating them as an independent contractor and do not withhold; they are responsible for their own self-employment taxes.
Misclassifying employees as independent contractors is a serious IRS enforcement area. If in doubt about how to classify a worker, consult a tax professional. Understanding the related tax forms builds on broader financial literacy: see how finance fits into your overall business structure and why clean operations reduce tax and legal risk.
Key Takeaways
- A W-9 collects tax identification information from contractors and vendors; it is kept on file by the requesting business and used to issue 1099s at year-end.
- Request W-9s before or at the time of first payment: never wait until January.
- Not collecting W-9s exposes your business to backup withholding requirements and IRS penalties for missing 1099 filings.
Download the official W-9 form and read line-by-line instructions directly from the IRS Form W-9 page.
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