When a vendor will not provide a W-9
A refusal does not remove your obligations, it changes them. You withhold, you report, and you document. Quietly filing nothing is the one response that turns the vendor’s problem into yours.
Paying gross and filing nothing. The vendor’s refusal is their penalty exposure; your failure to withhold and report is yours. A payer that fails to withhold when required can be held liable for the tax it should have withheld, plus information return penalties.
The procedure, in order
Work through these in order. Nothing in the sequence depends on the vendor cooperating, and that is deliberate: every step is one you can complete alone, from your own records, on your own schedule. Most payers manage the first two and then stall on the third, because withholding from somebody who is already annoyed with you feels like an escalation. It is simply the mechanism the statute provides. Applying it costs far less than explaining, two years later, why you decided not to.
Document every request
Date, method, and content of each solicitation, with portal logs or email copies. This is the foundation of any reasonable cause position, and without it nothing else you do will help you.
Make the required solicitations
An initial request, then first and second annual solicitations while the TIN is still missing. The schedule
Start backup withholding at 24%
On reportable payments, from the point at which you know you have no valid certification. This is not discretionary. Detail
Deposit the withheld amounts
Under your federal tax deposit schedule, the same way you deposit payroll withholding. Do not hold the money.
Report on Form 945
Withheld backup withholding is reported annually on Form 945, Annual Return of Withheld Federal Income Tax.
File the information return anyway
File the 1099 with the name and address you have, leaving the TIN blank. Never invent, guess, or use a placeholder number. That is a false return, and a false return is a considerably worse position than an incomplete one.
Furnish the payee statement
Send the vendor their copy showing the payments and the withheld amount. They will need it to claim the credit.
What you may and may not do
| Action | Permitted? |
|---|---|
| Withhold 24% from reportable payments | Required, not merely permitted |
| Refuse to onboard the vendor until the form arrives | Yes, and it is the cleanest route |
| Hold payment pending the form, where your contract allows | Yes. Check the contract first |
| File a 1099 with the TIN box blank | Yes, and you should |
| Use a TIN you found on an invoice or a state register | No. Use only what the payee certified on a W-9 |
| Invent, guess or use all zeros as a placeholder | No. That is a false return |
| Pay gross and file nothing | No. This is the exposure you are trying to avoid |
| Withhold and keep the money against the risk | No. Withheld amounts must be deposited |
Why vendors refuse, and what usually resolves it
Outright refusal is rarer than it looks. Most non-responses have a mundane cause: the request went to a general inbox, the person who opened it does not handle tax paperwork, or they got as far as Line 3a and closed the file. Fix the cause and the form usually arrives within a day. The table pairs the reasons you will actually hear with the reply that moves things along.
| Stated reason | Response |
|---|---|
| "I do not want to give out my SSN" | Legitimate concern. Point them at getting a free EIN instead, and offer a secure upload rather than email |
| "We are a corporation, so we are exempt" | Exempt from some reporting, not from certifying. Ask for the form with exempt payee code 5 |
| "It is under the threshold" | The threshold is applied at year end across all payments, and backup withholding does not track it. Detail |
| "I already sent one" | Check your records; it may be sitting in a mailbox rather than in the vendor file. Ask them to resend it to the portal |
| "I do not know how to fill it in" | The most common real reason. Send them a walkthrough and they usually return it the same day |
| "I am not a U.S. person" | Then a W-9 is the wrong form. Request the correct Form W-8 |
| Silence | Escalate to a named contact, then to the withholding notice. A letter stating that 24% begins on a specific date is remarkably effective |
A large share of unreturned W-9s are people stuck on Line 3a. One sentence of guidance (if you are a one-person business with no LLC elections, check the first box and use your own name on Line 1) resolves more cases than a compliance warning does.
Vendors asking the mirror-image question are answered at can I refuse to fill out a W-9.
Reasonable cause, and what supports it
- Dated records of the initial request and both annual solicitations.
- Evidence you offered a secure channel and the official form.
- Evidence you applied 24% withholding once you knew the certification was missing.
- Evidence you deposited and reported the withheld amounts.
- Evidence you filed the information return with the data you had.
- A written internal policy showing this is your standard process rather than an ad hoc response.
How reasonable cause applies to information return penalties
Frequently asked questions
What do I do if a vendor refuses to give a W-9?
Document your solicitations, apply 24% backup withholding to reportable payments, deposit and report the withheld amounts, and file the information return with the information you have. You do not simply skip the filing.
Can I refuse to pay a vendor without a W-9?
Contract terms permitting, many businesses do exactly that, and it is the cleanest option. Absent such terms, withholding at 24% is the mechanism the law provides.
Can I file a 1099 without a TIN?
Yes, and you may have to. File with the information you have, leave the TIN blank rather than inventing one, and keep evidence of your solicitations to support a reasonable cause position.
What if the vendor says they are exempt?
Ask them to say so on a W-9 with the appropriate exempt payee code. Exemption from reporting is not exemption from certifying, and you cannot apply an exception you have not documented.
General information, not tax advice. This page explains a federal tax form in plain English. It is not legal, tax, or accounting advice, and W9Form.org is not affiliated with the IRS. Verify everything against the official Form W-9 page on IRS.gov and speak to a licensed professional about your own situation. How we source and review these pages.