The short answer
You do not have a legal duty to hold a Form W-9 for every single human you ever pay, no matter the facts. What you do have is a duty to file any required information return with the contractor’s correct name and taxpayer identification number, and to apply backup withholding if you cannot. The W-9 is the standard, reliable way to satisfy that duty. So the honest answer to the title question is: not strictly required for every payee, but you should collect one from every US payee before you pay them anyway, because it is the cleanest path to staying compliant.
This guide explains why, with the IRS citations attached, and walks the three cases that trip people up: the US contractor, the foreign contractor, and the corporation. A quick note before we start. This is general information, not tax or legal advice. Reporting and withholding outcomes turn on the facts of your situation, so confirm the specifics with a qualified tax professional before you pay.
What a W-9 is actually for
A Form W-9 is not a tax in itself and it is not filed with the IRS. It is a request. You, the payer, use it to collect one thing from a US payee: their correct name and taxpayer identification number. The IRS About Form W-9 page states its purpose plainly:
“Use Form W-9 to provide your correct Taxpayer Identification Number (TIN) to the person who is required to file an information return with the IRS”
The Instructions for the Requester of Form W-9 say the same thing from your side of the table. The IRS Instructions for Form W-9 state:
“Form W-9 (or an acceptable substitute) is used by persons required to file information returns with the IRS to get the payee’s (or other person’s) correct name and TIN.”
That is the whole job of the form. You need the name and TIN so that, at year end, you can put accurate information on a Form 1099-NEC and the IRS can match it to the right person’s return. No correct TIN, no clean 1099.
Why best practice is to collect one from everyone
If the form is only strictly needed when you have to file a 1099, why collect it from every US payee? Two reasons, and both come straight from how the IRS structures the consequences.
First, you usually do not know at onboarding whether a payee will cross the reporting threshold. Collecting the W-9 up front means the name and TIN are already on file the moment you need them, instead of being a scramble in January.
Second, the cost of a missing TIN is real money. The IRS Backup Withholding page describes the trigger and the rate:
“There are situations when the payer is required to withhold at the current rate of 24 percent.”
That 24 percent applies, among other reasons, when “you failed to provide a correct taxpayer identification number (TIN) to the payer.” The Instructions for the Requester of Form W-9 close the loop on timing. They state that if you do not receive the payee’s TIN, “you must begin backup withholding on payments.” In plain terms, a payee who never gives you a usable W-9 forces you to hold back 24 percent of reportable payments and send it to the IRS until the gap is fixed. Collecting the form before the first payment is how you never end up there.
This is why the standard onboarding flow treats a W-9 as table stakes for any US contractor, vendor, or freelancer. It is cheaper to collect than to chase.
The foreign contractor: a W-9 is the wrong form
Here is the case where people get it backwards. A contractor in Manila or Berlin is not a US person, and the W-9 is built only for US persons. A foreign contractor should never sign a W-9. They give you a Form W-8BEN instead.
The IRS Instructions for Form W-8BEN draw the line explicitly. A foreign person uses W-8BEN:
“You must give Form W-8BEN to the withholding agent or payer if you are a nonresident alien who is the beneficial owner of an amount subject to withholding.”
And a US person is told to use the W-9 instead:
“You are a U.S. citizen (even if you reside outside the United States) or other U.S. person (including a resident alien individual). Instead, use Form W-9 to document your status as a U.S. person.”
So the two forms are mirror images. US person, W-9. Foreign individual, W-8BEN. A foreign entity uses the W-8BEN-E version. Asking a foreign contractor for a W-9 is not just unnecessary, it collects the wrong documentation and can mislead your year-end reporting. The W-8 is what certifies the foreign status that keeps a fully-abroad payment out of the 1099 system.
The corporation: usually exempt, still worth collecting
The third case is the gray one. Most payments to a corporation are exempt from 1099 reporting, so on paper you do not need a W-9 to file a form for them. But the standard practice is still to ask, and the reason is documentation.
The W-9 has a box where the payee certifies whether they are a corporation. That signed certification is your evidence of why you treated the payment as exempt. If the IRS ever asks why you did not issue a 1099 to a given vendor, “they certified corporate status on a W-9” is a much stronger answer than “we assumed.”
There is also a trap to watch. The exemption is not absolute. The IRS Instructions for Form W-9 note that certain payments to a corporation are still reportable and not exempt from backup withholding, including attorneys’ fees and medical and health care payments reportable on Form 1099-MISC. So even with a corporate vendor, a W-9 on file is what tells you whether the specific payment is one of the exceptions. Collect it.
The three cases at a glance
| Who you are paying | Form they provide | Why |
|---|---|---|
| US individual or sole proprietor contractor | Form W-9 | You need the name and TIN to file a 1099-NEC and avoid backup withholding |
| Foreign individual contractor | Form W-8BEN | Certifies foreign status, a US person form would be wrong |
| Foreign entity | Form W-8BEN-E | Entity version of the foreign status certificate |
| US corporation | Form W-9 (collect it anyway) | Usually 1099-exempt, but the W-9 documents that status and flags the non-exempt exceptions |
The pattern is simple. Every US payee gives you a W-9. Every foreign payee gives you a W-8. The only judgment call is the corporation, and the safe move there is to collect the W-9 even though most of those payments will not need a 1099.
Get the documentation right before you pay
The thread running through all three cases is the same: collect the right tax form before money moves. For US payees that means a W-9 at onboarding. For foreign contractors it means a W-8BEN or W-8BEN-E, and getting that one right is where most cross-border payers slip. Work through our W-8BEN collection checklist before your next foreign-contractor payment. It is free, instant, and walks the steps with the IRS citations attached.
For US contractors, the discipline is just as plain. No W-9 on file means you are exposed to backup withholding at 24 percent the moment a payment is reportable, so make the form part of the very first onboarding step.
When a platform handles it for you
A founder paying one contractor can request a W-9 by email and file the 1099 by hand. A team paying contractors across several countries is tracking which payees are US and need a W-9, which are foreign and need a W-8, which corporations are exempt and which payments are the exceptions, plus the year-end filing for each. That is where the manual approach starts to leak.
Omnivoo Contract Management handles it for a flat $49 per finalized contract. We collect the right tax form for each contractor, US or foreign, run the KYC, draft and manage the contract, and pay your contractors in 150+ countries, end to end. Transaction fees are passed through at cost, with no FX markup and no subscription.
Want the answer for your specific setup? See how Omnivoo Contract Management handles contractor onboarding end to end, or talk to our team.