A U.S. company is about to pay you. Before the money moves, someone in their finance team asks you for "a W-8." They will not explain why, and they will usually not pay you until they have it.
Here is why they ask. When a U.S. business pays certain kinds of income to a foreign person, the law makes the business responsible for collecting tax at the source. The business is called the withholding agent. If it cannot prove who you are, it has to assume the worst and hold back 30% of the payment. Form W-8BEN is the document you give the business so it does not have to do that.
The form does two separate jobs, and people often notice only the first one. Job one is to state that you are a foreign individual, not a U.S. person. Job two is to claim a lower tax rate under the treaty between the United States and your country, if a treaty exists and if the income qualifies. You can do job one without job two, but you cannot do job two without the form.
What the form actually does
Form W-8BEN is called the Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting (Individuals). Three things in that long title decide who uses it.
"Beneficial owner." You sign it as the person who actually owns the income, not as someone collecting it for another person.
"(Individuals)." This form is for human beings. If a company you own is being paid, the company does not use this form. It uses Form W-8BEN-E, which is a different and much longer form.
"Foreign status." The form is a statement that you are not a U.S. person. If the IRS counts you as a U.S. person, this is the wrong form and signing it would be a false statement. The instructions say plainly that a U.S. citizen or resident alien uses Form W-9 instead. So there are three ways to land in the U.S. column: U.S. citizenship on its own, the green card test, or the substantial presence test. Citizenship is enough by itself. If you are not a U.S. citizen, the two tests decide it, and where you happen to live does not.
When W-8BEN is the wrong form even though you are foreign. The instructions list several cases where a foreign person uses a different form:
- The payee is an entity, not a person: Form W-8BEN-E.
- You are claiming an exemption from withholding on pay for personal services performed inside the United States: Form 8233 or Form W-4.
- The income is effectively connected with a U.S. trade or business: Form W-8ECI.
- You are acting as an intermediary rather than as the beneficial owner: Form W-8IMY.
Where does the form go? Not to the IRS. You give it to the withholding agent, which is normally the company paying you, or to the bank or broker holding your account. They keep it in their records. You do not mail it anywhere yourself.
When does it have to be there? Before the payment. The instructions are direct about this: you give the form to the withholding agent before the income is paid to you. A form that arrives after the money has moved does not undo the tax that was already taken out. This is why platforms and clients block your first payout until the form is on file.
What if you do not give it? The payer withholds at 30%, or applies backup withholding. The money is gone from the payment. You are not necessarily out of pocket forever, because you may be able to file a U.S. tax return and ask for it back, but that is a return, a wait, and a lot of work you could have avoided with one form.
It expires. This is the part people miss. A W-8BEN is generally valid from the day you sign it until the last day of the third calendar year that follows. Sign it on 15 March 2026, and it is good through 31 December 2029. Sign it on 30 September 2015, and it was good through 31 December 2018. That second one is the IRS's own worked example. So the form covers three full calendar years plus the rest of the year you signed it, and then it stops. A new form is needed after that. The IRS calls this the general rule and says that in certain cases a form stays in effect indefinitely until circumstances change, but plan around the three-year rule unless your payer tells you otherwise.
It can also die early. If your details change so that the information on the form is no longer correct, the form becomes invalid at that moment. Moving to a different country is the obvious case. So is a change of name or address. You do not wait for the three years to run out. You send a new form.
Taxpayer numbers. Two separate lines, two separate triggers.
Line 5 is the U.S. taxpayer number, meaning an SSN or an ITIN. Line 6a is your own country's tax number, which the form calls a foreign TIN.
If you are claiming treaty benefits, you generally need a number: a U.S. number on line 5, or, for treaty purposes, a foreign TIN on line 6a instead. A treaty claim on a form with both lines blank is incomplete, and the payer will not apply the treaty rate.
There is a second trigger that has nothing to do with treaties. If the form is documenting a financial account you hold at a U.S. office of a bank or broker, the instructions require a foreign TIN on line 6a unless your jurisdiction does not issue one or you have not been issued one, in which case line 6b and your date of birth on line 8 come into play. So "I am not claiming a treaty, I can leave the numbers blank" holds for an ordinary client paying an invoice, but not for a brokerage account.
🇺🇸 If the IRS counts you as a U.S. person
You do not use this form. Ever.
The form your payer wants from you is Form W-9. W-9 and W-8BEN are two halves of the same question, and they are mutually exclusive. W-9 says "I am a U.S. person, here is my taxpayer number." W-8BEN says "I am a foreign individual, here is my country." One person cannot honestly sign both. You are a U.S. person if you are a U.S. citizen, if you hold a green card, or if you meet the substantial presence test.
Two situations trip people up.
First, a green card holder living abroad. You may spend the whole year in Lisbon, be paid by a U.S. platform, and be asked for "the foreigner form" by a support agent who is guessing. You still hold a green card, so the IRS still counts you as a U.S. person, so the correct form is still W-9. The country you sit in does not change this.
Second, a person who has just passed the substantial presence test without noticing. The test counts all of your days this year, one third of last year's days, and one sixth of the days from the year before. If you spent 130 days in the United States in each of the three years, the weighted count is 130, plus one third of 130, plus one sixth of 130, which is about 195 days. That is over the 183-day threshold, so the IRS treats you as a U.S. resident for the year, and a W-8BEN you signed in January is no longer true. The test also requires at least 31 days in the current year, and some visa categories and a closer-connection claim can change the result, so treat this as the shape of the rule rather than the whole of it.
🌏 If it does not
This is your form, and there are four things worth getting right.
Send it before the first payment, not after. Treat it as part of onboarding with any U.S. client, platform, bank or broker, in the same box as your invoice details.
Decide whether you are claiming a treaty rate. If your country has an income tax treaty with the United States and your income falls under it, you complete the treaty part of the form and the payer can withhold at the treaty rate instead of 30%. If you skip that part, the form still proves you are foreign, but the statutory rate applies.
Get the identification number sorted before you claim a treaty. For a treaty claim you generally need either a U.S. number (SSN or ITIN) on line 5 or your foreign tax number on line 6a. If you have neither, sort that out first, because the payer will not apply a treaty rate on an incomplete form. Separately, if you are opening an account with a U.S. bank or broker, they will usually need your foreign tax number on line 6a even when no treaty is involved.
Put the expiry in your calendar. The form dies on 31 December of the third year after you signed it. Payers are supposed to ask you for a new one, and many do, but some simply start withholding 30% again when the old form lapses. You find out when the payment lands short.
What is the same, and what is not
| Item | 🇺🇸 U.S. person | 🌏 Not a U.S. person |
|---|---|---|
| Which form the payer wants | Form W-9 | Form W-8BEN (an individual) or Form W-8BEN-E (a company) |
| Where it goes | To the payer, not the IRS | To the payer, not the IRS |
| What happens with no form | Backup withholding | 30% withheld, or backup withholding |
| Does it expire? | Generally no, until your details change | Yes. 31 December of the third year after signing |
| Can you claim a treaty rate? | Not applicable | Yes, if a treaty covers the income |
| Do you need a taxpayer number? | Yes, always | For a treaty claim: SSN or ITIN (line 5), or a foreign tax number (line 6a). Also a foreign tax number for a U.S. bank or brokerage account |
The two rows in the middle are the same for both groups. The form is given to the payer and not to the IRS, and no form means money is held back. Everything else on this page is different, and the difference starts with a single question: does the IRS count you as a U.S. person?
Common mistakes
🇺🇸 If the IRS counts you as a U.S. person
- Signing a W-8BEN because you live abroad. Where you live is not the test. If you hold a green card, or you meet the substantial presence test, you are a U.S. person and the form is W-9.
- Following a support agent's guess instead of the two tests. The person asking you for a form usually has no idea which of the two you are.
🌏 If it does not
- Sending the form after the invoice is paid. The 30% is already withheld by then, and getting it back means filing a U.S. return.
- Using W-8BEN when the money is paid to your company. If the payee is an entity, the form is W-8BEN-E.
- Leaving both number lines blank while claiming a treaty rate. A treaty claim generally needs a taxpayer number: a U.S. one on line 5, or a foreign one on line 6a.
- Forgetting the three-year expiry, then seeing a payment arrive 30% short with no warning.
- Moving to another country and leaving the old form in place. The information on it is no longer correct, so the form is no longer valid.
FAQ
Do I send Form W-8BEN to the IRS?
No. You give it to the withholding agent, which is normally the U.S. company, bank or platform paying you. They keep it on file. You never mail it to the IRS yourself.
How long is a Form W-8BEN valid?
Generally from the day you sign it until the last day of the third calendar year that follows. A form signed on 15 March 2026 is valid through 31 December 2029. It becomes invalid earlier if your circumstances change and the information on the form is no longer correct.
What happens if I do not give the payer a W-8BEN?
The payer withholds 30% of the payment, or applies backup withholding. You may be able to claim the money back later by filing a U.S. tax return, but the simpler path is to send the form before you get paid.
My company is being paid, not me. Do I use this form?
No. Form W-8BEN is for individuals. An entity uses Form W-8BEN-E instead.
Do I need an ITIN to file Form W-8BEN?
Not always. If you are only certifying that you are foreign to an ordinary client, the number lines can often stay empty. If you are claiming a treaty rate, you generally need a U.S. taxpayer number (SSN or ITIN) on line 5, or your foreign tax number on line 6a. And if the form is for a U.S. bank or brokerage account, they will usually need your foreign tax number on line 6a regardless of any treaty.
I am a green card holder living outside the United States. Which form do I use?
Form W-9. The green card test makes you a U.S. person no matter where you live, so W-8BEN would be the wrong form.
I moved countries. Is my old W-8BEN still good?
No. If your details change so the form is no longer correct, the form stops being valid at that point. Send the payer a new one, and do not wait for the three years to run out.
Does giving a W-8BEN mean I owe no U.S. tax?
No. The form tells the payer that you are foreign, and it can lower the rate withheld if a treaty applies. It does not by itself decide how much U.S. tax you owe.