Form W-9 gives a payer your name, tax ID and tax classification for information reporting. Learn who completes it, where it goes and common errors.
Form W-9, Request for Taxpayer Identification Number and Certification, is an IRS form a U.S. person uses to give a requester the name, taxpayer identification number, address, and federal tax classification needed for information reporting. A contractor, vendor, landlord, attorney, investor, or other payee may be asked to complete one.
The completed W-9 normally goes to the business, financial institution, or other requester — not directly to the IRS. The requester retains it and uses the information when preparing a Form 1099 or another information return.
A W-9 generally includes:
The legal-name and TIN combination matters. A sole proprietor generally enters the individual owner's name on line 1 even when operating under a trade name. A disregarded single-member LLC generally follows the owner-name and classification instructions rather than treating "LLC" as a complete federal tax classification.
A business should generally obtain a W-9 during vendor onboarding and before making potentially reportable payments. Waiting until January creates avoidable problems: the vendor may be difficult to reach, the name and TIN may not match IRS records, or backup withholding may have been required.
The payer should keep the signed form securely, use it to set up the vendor record, and request a new form when important information changes — including a legal-name change, new TIN, entity-classification change, ownership change, or notice that earlier information was incorrect.
A W-9 does not decide whether a worker is an employee or independent contractor. An employee generally completes Form W-4 and receives Form W-2; collecting a W-9 cannot convert an employee into a contractor.
Assume a California design studio hires an independent graphic designer. Before the first payment, the studio requests Form W-9. The designer provides the correct legal name, business name, address, federal tax classification, and TIN.
The studio records $3,200 paid directly by check during 2026. Because the payments are for services in the course of the studio's business and reach the applicable 2026 reporting threshold, the W-9 information helps the studio prepare Form 1099-NEC. If the studio had paid through a qualifying payment-card or third-party network, the payment processor may have the Form 1099-K responsibility instead.
Backup withholding is federal income tax withheld from certain reportable payments. It can apply when a payee fails to provide a TIN, provides an incorrect TIN, receives certain IRS notices, or does not make a required certification. The federal backup-withholding rate is currently 24%.
Backup withholding is not an optional penalty a payer adds after year-end. A payer must follow the applicable rules when making payments. The withheld amount is reported to the payee and IRS and may be claimed as federal withholding on the payee's return.
Form W-9 collects information from the payee. Form 1099-NEC reports qualifying nonemployee compensation after payments are made. The payee completes W-9; the payer prepares 1099-NEC.
Completing W-9 does not itself report income or create tax. Similarly, not receiving Form 1099-NEC does not make business income nontaxable.
Form W-9 is federal. California businesses may have separate state withholding and documentation duties. California Form 590, Withholding Exemption Certificate, can be used to certify an exemption from California nonresident withholding in applicable situations. It is not simply a substitute for every federal W-9 purpose.
California worker-classification rules also remain separate. A California payer should not rely on the W-9 label alone when deciding whether payroll, unemployment insurance, workers' compensation, or other employee rules apply.
Heath Income Tax can help businesses establish a W-9 collection process, reconcile vendor records, identify potential 1099 filing needs, and address federal or California reporting issues.
Do I file Form W-9 with my tax return?
No. Give it to the requester and keep a copy. It is not normally attached to your return.
Does a W-9 mean I will receive Form 1099-NEC?
Not necessarily. The payer still applies the payment type, amount, recipient, payment method, and other information-reporting rules.
Can I refuse to provide a W-9?
A requester may need the information to meet federal reporting duties. Failure to provide a correct TIN can result in backup withholding and may affect whether the requester will make payment.
Does a W-9 make me self-employed?
No. Classification depends on the actual facts and law, not the form's label.
The definitions and examples on this page are for informational purposes only and do not constitute tax advice. Tax laws change frequently and individual circumstances vary. Consult a qualified tax professional before making decisions based on this content.
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