W-9 vs W-8BEN: Which Form Do You Need?
If a U.S. company is paying you — as a contractor, vendor, or business — you will be asked for one of two forms: a W-9 or a W-8BEN. They do opposite jobs, and sending the wrong one can mean an unnecessary 30% withholding or a held payment. Here is how to know which is yours.
Form W-9 — For U.S. Persons
Form W-9 is used by U.S. persons: U.S. citizens, green-card holders, U.S. tax residents, and U.S.-registered businesses. It gives the payer your name and taxpayer ID (SSN or EIN) so they can report what they paid you on a Form 1099 at year-end. It certifies you are a U.S. person and not subject to backup withholding. Nothing is withheld from a correct W-9 — you report and pay your own tax later.
Form W-8BEN — For Foreign Individuals
Form W-8BEN is used by foreign (non-U.S.) individuals to certify they are not U.S. persons. It states your foreign status and country of tax residence so the payer applies the correct withholding — and, crucially, so you can claim a reduced rate under a tax treaty. Without a W-8BEN on file, a U.S. payer must withhold a flat 30% on U.S.-source income such as royalties, interest, and certain service payments. With a valid W-8BEN claiming treaty benefits, that rate can drop to 15%, 10%, or even 0%. Foreign companies (not individuals) use the related W-8BEN-E instead.
Which One Applies to You?
| Form | Who uses it | Purpose | Withholding |
|---|---|---|---|
| W-9 | U.S. persons & U.S. businesses | Provide SSN/EIN for 1099 reporting | None (you self-report) |
| W-8BEN | Foreign individuals | Certify foreign status; claim treaty rate | 30% default, reduced by treaty |
| W-8BEN-E | Foreign entities / companies | Same, for businesses | 30% default, reduced by treaty |
Common Mistakes
- A non-resident sending a W-9 because it looks simpler — this wrongly claims U.S.-person status.
- Leaving the treaty section of the W-8BEN blank, so the payer withholds the full 30% even though a lower rate was available.
- Using an EIN where an individual ITIN or foreign TIN is required to claim treaty benefits.
- Letting a W-8BEN lapse — it is generally valid for the year signed plus three calendar years, then must be renewed.