W-9 Request Letter
Asks a contractor or vendor for the tax details you need before you pay.
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Dear Sir / Madam,
We are updating our vendor records and need a completed Form W-9 from you before we process further payments.
We are asking because [why you need it].
Please complete and return the form by [date]. The form is available from the IRS website; if you would prefer, we can send a copy.
Please send it back by a secure method rather than plain email — it carries your taxpayer identification number.
If you believe a W-9 is not required in your case, let us know why and we will check our records.
What is a W-9 Request Letter?
A W-9 request asks a contractor, vendor, landlord or other payee for the legal name, tax classification and taxpayer identification number a United States payer needs on file before it pays them. It matters because the information return you file at year end is only as good as the details you collected at the start, and a missing or mismatched number can leave you required to withhold from the payment.
United States businesses send this as part of vendor onboarding: to freelancers and independent contractors, to attorneys, to landlords, to medical providers and to anyone else whose payments may be reportable. Property managers send it to owners, and nonprofits send it to speakers and grant recipients. The right moment is before the first payment, when you still have leverage — a request sent in January, after the money has gone out, is a request with nothing behind it.
Form W-9 is a United States federal form, and the requester's obligations sit in the Internal Revenue Code and the IRS instructions for the requester of Form W-9; some states add their own reporting on top. A payee who is not a United States person completes a form in the W-8 series instead. Outside the United States the equivalent step is different again — a UTR and construction scheme verification in the UK, a PAN and withholding declarations in India, an ABN in Australia, a business number in Canada. Check what your own tax authority requires.
The form is a record you keep, not something you send to the tax authority. It does not decide whether the worker is an employee or an independent contractor — that is a separate legal test with its own consequences, and getting it wrong is not cured by holding a W-9. It does not by itself create a reporting obligation; the type and amount of the payment do. It is not a contract, an insurance certificate or a compliance check. And nothing here is tax advice — confirm your position with a qualified tax professional.
What to put in a W-9 Request Letter
These are the details this template asks for. Anything left blank is marked in red on the preview so you can see what is still missing.
| Field | What goes in it |
|---|---|
| Business name | For example: Barton Supply Co. |
| Your address | For example: Unit 7, Barton Road, Columbus, OH 43212 |
| Customer name | For example: Halliwell Interiors Inc. |
| Why you need it | For example: we are required to report payments of $600 or more on Form 1099-NEC |
| Approximate amount paid this year optional | For example: 4,800 |
| Needed by | Free text |
| Signatory name optional | For example: K. Srinivasa Rao |
| Signatory designation optional | For example: Honorary Secretary |
| Issued to (full name) | For example: James Whitfield |
| Their address | For example: 588 Kinnear Road, Columbus, OH 43212 |
How to write a W-9 Request Letter
Ask before the first payment goes out
Build the request into onboarding alongside the contract, the bank details and the insurance certificate, and make the completed form a condition of setting the vendor up for payment. Collecting it while the vendor still wants to be paid is the difference between a five-minute task and a filing-season chase across dozens of accounts.
Name the exact form and its source
Say Form W-9, Request for Taxpayer Identification Number and Certification, and point the vendor to the current version on the IRS website rather than attaching an old copy from your files. Add one line for payees who are not United States persons explaining that they complete the appropriate form in the W-8 series instead, and let them tell you which applies.
Explain what you will do with it
State plainly that the information is used to prepare required information returns, that it is held in your vendor records, and that it is not shared beyond that. Vendors hesitate over a request for a Social Security number from someone they have just met, and two lines explaining the purpose resolve most of that hesitation.
Give a secure return route and a date
Offer an upload to a portal, an encrypted transfer or a mailed hard copy — not ordinary email, which leaves taxpayer identification numbers sitting in inboxes on both sides. Give a specific return date tied to your payment run, so the deadline is concrete: form received by the 20th, first payment on the 30th.
Say what happens if it does not arrive
State the consequence: the payment is held, or backup withholding applies at the rate the IRS sets and is remitted rather than paid to the vendor. Then keep dated copies of every request you send. Being able to show that you asked, and when, is part of demonstrating that you made a proper solicitation.
Common mistakes
- Leaving the request until the end of the year, so you chase taxpayer numbers during filing season and end up filing late or corrected returns.
- Accepting a form with a trading name on the legal name line, which produces a name and number mismatch notice months later.
- Collecting completed forms by ordinary email, leaving Social Security numbers stored in two mailboxes and in every backup of them.
- Sending a W-9 to a payee who is not a United States person, which gets you the wrong documentation and the wrong withholding treatment.
- Never refreshing the form when a vendor incorporates or changes name, so returns are filed against an identification number that no longer belongs to them.
Frequently asked questions
Who has to complete a Form W-9?
United States persons — individuals, sole proprietors, partnerships, corporations, estates and certain trusts — who receive payments that may be reportable by the payer. Payees who are not United States persons use a form in the W-8 series instead. Whether a specific payment is reportable depends on its type and amount, which is set out in the IRS instructions and worth confirming with your tax adviser.
What is the difference between a W-9 and a 1099?
The W-9 is collected from the vendor and stays with you: it supplies the legal name, tax classification and taxpayer identification number. The 1099 series is what you file and issue at year end to report what you actually paid. One is the input, the other is the output. Without the first, the second gets filed on information you have had to guess at.
Can I refuse to pay a vendor who will not give me a W-9?
That is a contract question, and worth checking with counsel. What the tax rules address is different: where a payee does not furnish a taxpayer identification number, the payer may be required to apply backup withholding to reportable payments at the rate the IRS specifies and remit it. Many payers hold new vendor set-up until the form arrives for exactly this reason.
Do I need a W-9 from a corporation?
Often yes. Payments to corporations are exempt from reporting in many categories but not all — attorney payments and certain medical and health care payments are common exceptions. Because the exemption depends on the payment type rather than the entity type, most payers collect the form from every vendor and let the reporting rules decide afterwards.
What do I do if the name and number do not match?
The IRS notifies payers of mismatches, and its instructions set out the notice process and what the payer must do next, including soliciting corrected information from the payee. Do not simply amend the form yourself. Follow the published process, keep the correspondence, and take advice from a tax professional if withholding may be triggered.
This page explains general practice and is not legal advice. Requirements differ between countries and, in some cases, between states — check what applies where the document will be used.