W-9 vs W-8BEN for American retirees in Spain

One of the quietest but most expensive mistakes an American retiree can make after moving to Spain has nothing to do with visas or Spanish tax. It happens when a US bank or broker sees the new foreign address, asks the retiree to "recertify" their tax status, and the retiree reasons, "I live abroad now, so I must be foreign." They sign a Form W-8BEN, the certificate of foreign status. That single form can flip an account into 30% nonresident withholding and the wrong reporting stream, and it is a certification signed under penalties of perjury.

This page explains the difference between the W-9 and the W-8BEN for a US person who has retired to Spain, why the answer is almost always the W-9, when the W-8BEN is genuinely correct, and how the Spanish side of the same question, a bank's FATCA self-certification, is a separate request that people often confuse with the US forms. It is a certification and reporting question, not a return-filing question: it sits alongside your annual US filing obligations and your estimated-tax calendar, but it is about which box you tick before the income is even paid.

The distinction matters most for anyone keeping a US brokerage account after moving to Spain or opening a Spanish account remotely. Get the certification right and reporting flows normally; get it wrong and you can spend months untangling withholding and 1042-S forms that never should have existed.

"Clients tell us their US broker asked them to fill in a form and they were not sure which one applied now that they live in Spain. The honest answer is usually the simplest one: if you are still a US citizen, nothing changed. You are a US person, so you sign the W-9. We see real damage when someone signs the foreign-status form by accident."

The short answer

If you are a US citizen or a US green-card holder, you are a US person for tax purposes, and the form a US institution needs from you is the W-9. The W-9 certifies your US status and gives the payer your taxpayer identification number so your income is reported on Form 1099 and paid without nonresident withholding. Living in Spain does not change this.

The W-8BEN is the opposite certification. It is signed by a person who is not a US person, to certify foreign status and, where a treaty allows, to claim a reduced withholding rate on US-source income. A US citizen who signs a W-8BEN is certifying something untrue.

Why you are still a US person

US tax status does not follow where you sleep. A US citizen is a US person for tax purposes for life, regardless of where they live, until citizenship is formally renounced. A lawful permanent resident, the holder of a green card, is also a US person for tax until that status is legally abandoned or revoked. Neither status ends simply because you became a Spanish tax resident.

This is different from how immigration and residence work. For Spain, you may be a resident who declares worldwide income and files under the Spanish system. For the United States, you remain inside the US person universe: worldwide income on the US return, information reporting, and the certifications that go with being a US taxpayer. The two systems overlap through the US-Spain tax treaty and the foreign tax credit, but your US person status is not something you can switch off by moving.

Because of that, when any payer, a bank, a brokerage, a fund, a US employer paying a pension, needs to know your status, the honest certification for a citizen or green-card holder is the W-9. The confusion usually comes from the word "foreign": people assume that living in a foreign country makes them foreign for US tax. It does not.

When you give a W-9

Form W-9 is the request for a taxpayer identification number and certification. You give it to a US payer or withholding agent, not to the IRS. By signing it, you certify that you are a US person and provide your Social Security number or other US TIN, so the payer can report your interest, dividends, brokerage proceeds, pension distributions and similar payments to the IRS on the correct Form 1099.

For a retiree in Spain, the W-9 is the form your US brokerage, your IRA or 401(k) custodian, your US bank and your pension payer will use. When you update your address to a Spanish one, a diligent institution may ask you to confirm your status has not changed. The right response, for a citizen or green-card holder, is an updated W-9, not a switch to a foreign-status form. Keep the certification current whenever your address, name or information changes, because an out-of-date certification can prompt the payer to start withholding.

A W-9 does not expire on a fixed schedule the way a foreign-status certificate does. It stays valid until the information on it becomes incorrect or the payer has reason to believe it is unreliable. In practice, that means you refresh it when something material changes, not on a countdown.

When W-8BEN is (and is not) correct

The W-8BEN, "Certificate of Foreign Status of Beneficial Owner," is the right form only for a genuinely non-US person receiving US-source income. Its purpose is to establish that the recipient is foreign and, when a tax treaty applies, to claim the reduced treaty withholding rate rather than the default 30% nonresident rate. Income paid on a W-8BEN is generally reported on Form 1042-S, not Form 1099.

There are households where a W-8BEN is exactly right, and a US retiree in Spain may live in one. If your spouse is a Spanish national with no US citizenship and no green card, and that spouse personally owns US-source investments, the spouse may sign a W-8BEN to certify foreign status and claim the treaty rate on US dividends. That is a real, correct use of the form, for the non-US spouse, on the non-US spouse's own income.

What the form is not is a way for a US citizen to signal "I moved abroad." It is also not the form for a US entity or a US grantor trust; entities use different W-8 or W-9 variants. If you are the US person on the account, the W-8BEN is the wrong document even though you now live in Spain. The test is your status, not your postcode.

The wrong-form trap and its cost

Signing a W-8BEN as a US person is not a harmless paperwork slip. It tells the payer to treat you as a foreign recipient, which can produce several problems at once. The payer may apply 30% nonresident withholding to US-source income such as dividends and certain interest. It may report you on Form 1042-S instead of the Form 1099 the IRS expects for a US person. And because you certified foreign status under penalties of perjury, you have made a false statement on a federal form.

The reporting mismatch is the part that lingers. Your US return, filed as a US person, will not line up with a 1042-S that describes you as a foreign recipient. Reconciling that with the IRS, and recovering wrongly withheld amounts, can take an entire filing cycle. Meanwhile the account may keep withholding until you correct the certification.

The fix is to provide a corrected W-9 to the institution as soon as the error is found, ask them to update your status prospectively, and work with your US tax adviser on recovering any withholding that was applied in error. The sooner the certification is corrected, the smaller the mess.

Spanish banks and FATCA self-certification

There is a second, separate certification that trips people up because it also asks about US status, but points the other way. When you open or keep an account at a Spanish bank or broker, that institution has its own duty under FATCA and the related intergovernmental agreement to identify account holders who are US persons and report those accounts to the Spanish tax authority, which passes the data to the IRS. To do this, the Spanish institution asks you to self-certify.

That Spanish self-certification is not a US IRS form you are filing with the US government; it is the foreign bank collecting the information it needs to comply. The bank may use its own self-certification form, and it may ask for your US taxpayer identification number, sometimes referencing a W-9 as the way to capture that number. The point of the exercise is the opposite of the W-8BEN situation: here you are confirming that you are a US person, so the Spanish institution can report you correctly. This is covered in more depth in the guide to Spanish banking, FATCA and FBAR for US persons and comes up when you open a Spanish account remotely.

So the same retiree can correctly do two things that feel contradictory: give a W-9 to a US broker to certify US status, and give a Spanish bank a self-certification that also confirms US status. Both are consistent, because both say the same true thing, that you are a US person. The only wrong move is telling a US institution you are foreign.

Green-card holders and expatriation

Green-card holders are the group most likely to face a genuinely changing answer, but the change does not happen automatically on arrival in Spain. A lawful permanent resident remains a US person for tax, and uses the W-9, until the green card is formally abandoned, filed with the appropriate form, or is administratively or judicially revoked. Simply living in Spain and not renewing does not, by itself, end US tax status on the timetable people assume.

When a green-card holder does formally give up the card, or when a citizen renounces, US person status ends going forward, and only then does a foreign-status certification become appropriate for future US-source income. Long-term residents and citizens who end their status can also face the US exit tax on covered expatriates, and the decision to renounce US citizenship while retired in Spain has consequences well beyond a certification form. Non-citizen retirees who never held US status should look at the separate path for green-card holders and non-US citizens on the non-lucrative visa.

The practical rule while you still hold the status: you are a US person, so you sign the W-9. Only after status formally ends does the foreign-status form enter the picture, and the timing of that change is a decision to plan carefully, not a box to tick because you have a Spanish address.

Backup withholding and fixing a mistake

There is a cost to giving no certification at all, not just to giving the wrong one. If a US payer requests a W-9 and you do not provide a correct taxpayer identification number and certification, the payer may apply backup withholding at a flat statutory rate to reportable payments such as interest, dividends and broker proceeds. Providing a correct, current W-9 with a valid US TIN generally prevents this. Backup withholding is a US mechanism separate from the 30% nonresident withholding that a wrongly filed W-8BEN can trigger, but the practical lesson is the same: keep your certification accurate and current.

If you discover that an account is set up on the wrong basis, whether it is applying nonresident withholding from a mistaken W-8BEN or backup withholding from a missing W-9, the path is to correct the certification with the institution first, then address any wrongly withheld amounts through your US return with your tax adviser. Certification errors are usually fixable; they are just slow and avoidable. The cheapest version of this problem is the one you prevent by signing the right form the first time.

At a glance

Situation	Correct form for a US retiree in Spain
US citizen with a US broker, bank, IRA or pension	W-9 (certifies US person status; income on Form 1099)
Green-card holder who still holds the card	W-9 (still a US person for tax until status formally ends)
Non-US spouse with no citizenship or green card, holding US investments	W-8BEN (foreign status; may claim treaty-reduced rate; income on 1042-S)
US citizen who moved abroad and is asked to "recertify"	Updated W-9 — never a W-8BEN just because the address is foreign
Spanish bank asking about US status under FATCA	The bank's own self-certification confirming you are a US person
No valid W-9 / TIN on file with a US payer	Risk of backup withholding until a correct W-9 is provided
Wrong W-8BEN already signed	Correct it with an updated W-9, then recover wrong withholding via the US return
Status formally ended (renounced citizenship or abandoned green card)	Foreign-status certification becomes appropriate going forward; consider exit tax

Sources reviewed July 2026: IRS Form W-9 and its instructions (Request for Taxpayer Identification Number and Certification; definition of a US person; backup withholding on failure to certify); IRS Form W-8BEN and instructions (Certificate of Foreign Status of Beneficial Owner; 30% default nonresident withholding; treaty claims; validity period); IRS pages on nonresident withholding, Form 1042-S and Form 1099 reporting streams; IRS guidance on US citizens and resident aliens abroad and on green-card holders as US persons for tax; expatriation and exit-tax rules for covered expatriates; and FATCA and the US-Spain intergovernmental agreement on the identification and reporting of US account holders by Spanish financial institutions. Forms, rates, thresholds and procedures change. This is general information only, not legal, tax, financial or immigration advice, and no lawyer-client relationship is created. Confirm the correct certification for each account with the institution and a qualified US tax adviser before signing.