Before the first payment to any contractor, US business or not, one form decides everything downstream: the certificate that states whether the payee is a US person or a foreign person. Get that answer, and the withholding, the reporting, and the year-end forms all follow mechanically. Get it wrong, and every downstream step inherits the error.
- Form W-9 is the US person's certificate: citizens, resident aliens, and US entities.
- Form W-8BEN is the foreign individual's certificate (foreign entities use W-8BEN-E).
The confusion is real on both sides of the table. Contractors who have lived in the US for years on a student visa sign W-9s they should not sign. Banks mail W-8BENs to green-card holders who are US persons by law. And payors, seeing a foreign address or a foreign name, guess. This guide gives the actual test, the cases where it surprises people, and what each wrong answer costs.
The current versions are Form W-9 (Rev. March 2024) and Form W-8BEN (Rev. October 2021). Always download the live copy from irs.gov.
The core distinction: US person or foreign person, defined by law
The W-9 requester instructions define the US-person side precisely, in four items: "An individual who is a U.S. citizen or U.S. resident alien," then "A partnership, corporation, company, or association created or organized in the United States or under the laws of the United States," then "Any estate (other than a foreign estate)," and "A domestic trust." Everyone else is a foreign person, and the same instructions send them across the aisle: "Advise foreign persons to use the appropriate Form W-8 or Form 8233."
Notice what the definition does not mention: where the person lives, what their address looks like, or what currency they invoice in. A US citizen in Lisbon is a US person and files a W-9. A foreign individual is a foreign person wherever they happen to be sitting. The form follows legal status, not geography.
"Resident alien" is a tax test, not a feeling
For individuals, the whole question compresses into one term: is this person a resident alien? US tax law answers it with two tests (IRC §7701(b), explained in Publication 519):
- The green card test. A lawful permanent resident is a resident alien wherever they live (absent a treaty tie-breaker election, a rare case worth professional advice). A green-card holder in Spain who is mailed a W-8BEN by their bank is being handed the wrong form: they are a US person and should file a W-9, whatever the bank's software assumed.
- The substantial presence test. Without a green card, presence does the work: at least 31 days in the current year, and 183 weighted days across three years (all of this year's days, plus one third of last year's, plus one sixth of the year before). Cross the threshold and the person is a resident alien for tax purposes even with no immigration status change.
Then comes the carve-out that generates more wrong W-9s than any other rule: exempt individuals. Days spent in the US as an F or J student generally do not count toward substantial presence for the first five calendar years. So a foreign student in year three of a degree, physically present every day, is usually still a nonresident alien, and the right certificate for their freelance work is W-8BEN (or Form 8233 for treaty-exempt services pay), not the W-9 their client's onboarding portal defaults to. The person who "has been here for years" and the person who is a resident for tax purposes are not the same person.
What each form actually does
The two certificates trigger two different machines.
A W-9 collects the payee's TIN and certification. Payments then run through the domestic regime: no withholding by default, 24% backup withholding only if the TIN is missing or wrong, and a 1099-NEC at year end once payments reach the current reporting threshold ($2,000 for 2026, inflation-indexed after).
A W-8BEN certifies foreign status and beneficial ownership, carries the treaty claim if one applies, and moves the payee into the foreign regime: 30% withholding on US-source income (IRC §1441) unless reduced, and year-end reporting on Form 1042-S instead of a 1099. It generally stays valid through the last day of the third succeeding calendar year. And for services, the sourcing rule does heavy lifting first: work physically performed outside the US is foreign-source, so a foreign contractor working entirely from abroad often faces no US withholding at all, with the W-8BEN kept on file as the proof. See 1099 or 1042-S for the reporting side of this split.
Two answers that are never right here: a payor demanding both a W-9 and a W-8BEN from the same payee for the same payment is asking the payee to certify two contradictory statuses, and one of the forms is wrong. And a W-4 belongs to employees, not contractors.
The foreign-owned US LLC: organized here, but whose certificate?
The W-9 definition covers entities "created or organized in the United States," which makes a US LLC look like an automatic W-9 case. For a single-member LLC it is not automatic, because a single-owner entity that has not elected corporate treatment is a disregarded entity: for tax purposes the payee is the owner, and the certificate follows the owner.
- US LLC, single member is a US person → the owner's W-9 (the usual case, and the LLC's name can appear on it).
- US LLC, single member is a foreign individual → the owner's W-8BEN. The US wrapper does not make the income a US person's income.
- US LLC, single member is a foreign company → the owner's W-8BEN-E.
So the practical payor question for any single-member LLC is not "where was it formed" but "who owns it, and what is the owner?" A multi-member LLC or an LLC that elected corporate treatment is its own taxpayer, and a US-organized one files the W-9 in its own name. For the individual-vs-entity side of the foreign fork, see W-8BEN vs W-8BEN-E.
Comparison table
| Form W-9 | Form W-8BEN | |
|---|---|---|
| Who files | US persons: citizens, resident aliens, US entities | Foreign individuals (entities file W-8BEN-E) |
| Green-card holder (anywhere in the world) | Yes, W-9 | Never |
| F-1 student, year 3, physically in the US | Usually not | Usually yes (exempt-individual rule) |
| What it certifies | US status + TIN | Foreign status + beneficial ownership (+ optional treaty claim) |
| Withholding regime | None by default; 24% backup withholding on TIN failure | 30% on US-source income unless reduced; foreign-performed services often not US-source at all |
| Year-end form | 1099-NEC | 1042-S (when US-source amounts are reportable) |
| Validity | Until facts change | Through the third succeeding calendar year |
Worked example: three contractors, one onboarding question
Corliss Media, a US publisher, onboards three freelancers in the same month:
- Dana, a US citizen in Portugal. Foreign address, euro invoices, and still a US person by citizenship. She files a W-9, and her payments run through the 1099 regime. The address changed nothing.
- Tomás, an F-1 student in his third year at a US university. He has been in the US the whole time, but his student days do not count toward substantial presence, so he should generally still be a nonresident alien. The right form is W-8BEN, and if he claims a treaty exemption on pay for services performed in the US, that claim travels on Form 8233, not the W-8BEN.
- A one-member Wyoming LLC owned by a designer in Argentina. US LLC, foreign owner, no corporate election: disregarded. The certificate is the owner's W-8BEN, and the sourcing question (is any of the work performed in the US?) decides whether withholding applies at all.
Three different certificates from one question asked properly: what is this payee, as a matter of tax law?
Why it matters
The W-9-or-W-8BEN fork is the first decision in the chain, and each wrong branch has its own cost:
- A foreign person on a W-9 → no withholding was taken where 30% may have been due, and the shortfall is the payor's liability.
- A US person on a W-8BEN → a US person's income routed into the foreign regime, wrong forms at year end, and a payee with a filing mess.
- Both forms collected "to be safe" → contradictory certifications and no defensible file.
The test is legal status, not geography, and the two rules that surprise everyone run in opposite directions: the green card makes a person a US filer anywhere on earth, and the student visa keeps a person foreign while they live down the street. Ask the status question first. The form, the withholding, and the year-end paperwork all follow.
This article is general information for US withholding agents, not legal or tax advice. Treaty positions turn on the payee's specific facts and the current treaty text. Confirm the analysis for your situation with a qualified tax advisor before relying on it.
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This article is for general educational purposes and is not legal or tax advice. Withholding outcomes depend on the specific facts of each payment. Consult a qualified tax professional before making withholding decisions.