The US Spain Tax Treaty Explained: Who Taxes What

By Victor Gersten, EA, CFP®, MS, MPAS™

Almost every cross-border question an American in Spain has eventually comes down to one thing: which country gets to tax this, and what happens if both of them do.

The US Spain tax treaty is the document that answers that. It is also the document most people have heard of and almost nobody has read, which is how a lot of confident but wrong advice gets passed around.

This article walks through what the treaty actually allocates, income type by income type, and then explains the two provisions that do the real work for a U.S. citizen. It also covers what the treaty does not do, which turns out to be the more expensive half of the subject.

What the Treaty Is and What It Covers

The governing document is the convention signed in February 1990, as amended by a protocol signed in Madrid in January 2013. That protocol sat unratified for six years and finally entered into force in November 2019. Anything written about the US Spain tax treaty before then may describe rules that no longer apply.

The treaty covers income taxes. On the Spanish side that means the personal income tax (IRPF) and the corporate income tax. On the U.S. side it means the federal income taxes under the Internal Revenue Code plus a couple of narrow excise taxes.

It does not cover the Spanish wealth tax. It does not cover the solidarity tax on large fortunes. There is also no separate U.S. Spain estate or gift tax treaty, so U.S. estate tax and Spanish inheritance tax operate entirely independently of each other. Those omissions matter enormously and are covered further down.

The Saving Clause: Read This Before Anything Else

Here is the provision that makes the U.S. Spain tax treaty behave differently for you than it does for a Spanish national.

Article 1(3) says that notwithstanding almost everything else in the treaty, a country may tax its own residents, and by reason of citizenship may tax its own citizens, as if the treaty had never come into effect.

That is the saving clause, and it is in every modern U.S. treaty. Its practical meaning for you is blunt: most of the time, when the treaty says income is “taxable only in Spain,” the United States taxes it anyway, because you are a U.S. citizen.

Article 1(4) lists the exceptions that survive the saving clause. The important ones for an individual are:

• Article 24, relief from double taxation. This survives, which is the only reason the whole structure works.
• Article 25, non-discrimination, and Article 26, mutual agreement procedure. These survive.
• Articles 21 and 22, government service and students, but only for individuals who are neither citizens of, nor have immigrant status in, the country doing the taxing.

Notice what is not on that list. Of all of Article 20, which covers pensions, annuities, alimony and child support, only the child support paragraph is carved out. Private pensions, social security and annuities are all fully exposed to the saving clause.

So when you read that your private pension is “taxable only in Spain,” the correct reading for a U.S. citizen is: Spain taxes it, and the United States taxes it too, and Article 24 is the provision intended to stop you paying full freight twice.

Who Taxes What: The Allocation, Income Type by Income Type

The table below assumes you are a U.S. citizen who is tax resident in Spain. Every line is subject to the saving clause unless noted.

Employment income

Allocated to where the work is physically performed. If you are sitting in Valencia doing the work, that is Spanish-source income for U.S. purposes, which is what makes Spanish tax on it creditable on your U.S. return.

Private and company pensions, IRAs and 401(k) distributions

Article 20(1)(a): taxable only in the country of residence, meaning Spain. Subject to the saving clause, so the United States taxes it as well.

Spain treats these as employment income in the general base at the progressive scale, not at the lower savings rates. A binding Spanish ruling in March 2025 confirmed this directly and confirmed there is no special reduction or exemption for a U.S. plan.

The 2013 protocol added a paragraph on transfers between pension funds. A direct transfer between qualified U.S. retirement plans, including plan to IRA, where you never take receipt of the money, is not a Spanish taxable event. An indirect 60-day rollover is. So is a Roth conversion. So is a transfer into a Spanish pension plan.

U.S. Social Security

Article 20(1)(b) is worded differently from the rest of Article 20. It says social security benefits paid by one country to a resident of the other, or to a citizen of the United States, may be taxed in the paying country.

“May be taxed” is the treaty formula for a shared right, not an exclusive one. The United States taxes your benefits. Spain, as your country of residence, also taxes them, and treats them as employment income in the general base.

Whether Spain must give you credit for the U.S. tax is genuinely unresolved, for reasons explained in the relief section below. It is the single most consequential open question in this treaty for American retirees.

Government and military pensions

Article 21 handles pensions paid by a government for services rendered to that government, which includes federal civil service and military retired pay. These are taxable only in the paying country, so the United States, and Spain exempts them.

Spain applies what is called exemption with progression, meaning the exempt pension still pushes up the rate applied to your other Spanish-taxable income. It is not invisible on your Spanish return, it is just not taxed directly.

There is a genuine technical question about how Article 1(4)(b)’s “immigrant status” limitation applies to a U.S. citizen holding Spanish residency. Published Spanish guidance applies the exemption as described. I have found no ruling addressing the point either way, so treat it as an open technical question rather than a planning opportunity.

Annuities

Article 20(2): taxable only in the country of residence, so Spain, subject to the saving clause. The treaty defines an annuity narrowly, as periodic payments under an obligation to pay in return for adequate and full consideration other than services rendered.

An annuity held inside an IRA or 401(k) is a pension distribution, not a treaty annuity, and the Spanish treatment of the two is far apart. The boundary is fact-specific.

Dividends

Article 10, as amended by the 2013 protocol. The source country may withhold at 15% in the general case, or 5% where the beneficial owner is a company holding at least 10% of the voting stock. The rate drops to zero for a company holding 80% or more for twelve months and meeting the limitation on benefits tests, and for qualifying pension funds.

Interest

Article 11, as amended. This is one of the protocol’s biggest changes: interest is now generally taxable only in the country of residence, meaning zero withholding at source. A narrow exception applies at 10% to certain contingent interest arising in the United States that does not qualify as portfolio interest.

Royalties

Article 12, as amended. Also reduced to zero withholding at source, taxable only in the country of residence. Before the protocol these were taxed at rates up to 10%.

Capital gains

Article 13, as amended. Most gains are taxable only in the country of residence. The significant exception is gains from shares or rights that directly or indirectly entitle the owner to the enjoyment of immovable property, which remain taxable where the property sits.

Other income not covered elsewhere

Article 23, the catch-all. Taxable only in the country of residence. This is where a Roth IRA distribution landed in one Spanish binding ruling, which is part of why the Roth question is so contested. The full treatment is in The Roth IRA in Spain: What Americans Get Wrong Before They Move.

Article 24: How the Double Tax Actually Gets Relieved

Two paragraphs do all the work, and they run in opposite directions.

Article 24(1): Spain credits U.S. tax, with one large exclusion

Where a Spanish resident has income that may be taxed in the United States under the treaty, other than solely by reason of citizenship, Spain allows a deduction for the U.S. income tax actually paid, capped at the Spanish tax attributable to that income.

Read that exclusion carefully. For most of your income, the United States is taxing you because you are a citizen, not because the treaty gives it a source-country right. That tax is expressly outside Spain’s credit obligation. Spain gives you little or nothing for it.

Article 24(3): the resourcing rule, which is where relief actually comes from

For an individual who is a U.S. citizen and a resident of Spain, income that the United States may tax by reason of citizenship is deemed to arise in Spain to the extent necessary to avoid double taxation, provided the U.S. tax is not reduced below what a non-citizen would pay.

This is the load-bearing provision. It re-sources income that would otherwise be U.S.-source so that it can absorb Spanish tax as a foreign tax credit on your U.S. return. Article 24 survives the saving clause, which is what lets this work at all.

On Form 1116 this appears as its own category, “certain income re-sourced by treaty,” requiring a separate form with its own limitation computed per treaty country. It is not the same bucket as your general or passive category income.

The practical shape of it: Spain taxes first as the country of residence. Spain gives you limited credit. The United States then relieves the remaining double tax through resourcing. Your total is usually close to the higher of the two countries’ rates rather than the sum of both, but the mechanism runs in a direction most people do not expect.

And a floor. Resourcing relieves only to the extent necessary, and the United States keeps at least the tax a non-citizen would pay. On U.S. Social Security and U.S. government pensions, where the treaty gives the United States a genuine source-country right, resourcing does not wipe out the U.S. tax.

The timing problem nobody mentions

Your Spanish return for a calendar year is filed the following spring, after your U.S. return for that same year is due. Claiming Spanish tax as a credit on the U.S. return therefore usually means electing the accrual method for foreign taxes, or amending. This is routine, but it has to be decided deliberately rather than discovered in April.

What the Treaty Does Not Do

This section is short and it is the most expensive part of the article.

It does not touch the Spanish wealth tax. The wealth tax is not among the taxes the treaty covers, and neither is the solidarity tax on large fortunes. There is no tie-breaker, no exemption, no reduced rate and no mutual agreement route for either one. They are also not creditable against U.S. tax, because the U.S. foreign tax credit requires an income tax or a tax in lieu of one, and a net wealth tax is neither. Spain’s own provision for crediting foreign wealth taxes has nothing to bite on, because the United States does not levy one. It is a pure additional cost.

It does not touch estates or inheritances. The United States has estate or gift tax treaties with fifteen countries. Spain is not one of them. U.S. estate tax is imposed on the estate; Spanish inheritance tax is imposed on each heir individually, at rates that depend on the heir’s relationship to the deceased and the heir’s own existing wealth. They have different taxpayers, different bases and different timing, and there is no treaty credit between them.

It does not decide your residency for you. Article 4 gives tie-breaker rules, but Spanish domestic law decides whether you are a Spanish tax resident in the first place, and the treaty does not remove obligations that follow from Spanish residence rather than from Spanish source income.

It does not solve the PFIC problem. Nothing in the treaty changes how U.S. rules treat Spanish investment funds. See The PFIC Trap.

Two Provisions Worth Knowing About

Limitation on benefits. The 2013 protocol replaced Article 17 with a modern limitation on benefits article. It is aimed at treaty shopping by entities rather than at individuals, but if you hold income through a company or a structure, whether that entity is a qualified person is a real question rather than a formality.

Mandatory arbitration. The protocol added arbitration provisions to the mutual agreement procedure. If the two tax authorities cannot resolve a case, it can go to binding arbitration. This is genuinely useful and it is why the mutual agreement procedure is worth more than it used to be.

Where This Shows Up in Practice

The treaty is the frame, but most real questions sit at the intersection of the treaty and one country’s domestic rules. The pieces below go deeper on the ones that come up most:

• The US-Spain Totalization Agreement and Your Social Security, which is a separate agreement from the tax treaty and does a different job.
• Double Taxation: Foreign Earned Income Exclusion and Foreign Tax Credit Simplified, on choosing between the two U.S. mechanisms.
• The Beckham Law in 2026, on Spain’s impatriate regime and how it interacts with all of the above.
• Modelo 720, on Spanish reporting, which the treaty has nothing to say about.
• Five Financial Mistakes Americans Make Before Moving to Spain, for the pre-move version of all of this.

Frequently Asked Questions

Does the US Spain tax treaty mean I only pay tax once?

Not exactly. It means you should not pay full tax twice on the same income. Because of the saving clause, both countries usually tax the same income and then one of them gives credit. The total generally lands near the higher of the two rates.

Does the treaty stop me having to file a U.S. return?

No. U.S. citizens file annual federal returns regardless of where they live, and the saving clause preserves that expressly.

Which country taxes my Social Security?

Both, in practice. The treaty gives the United States a taxing right and Spain taxes it as the country of residence. Whether Spain credits the U.S. tax is unsettled.

Does the treaty cover the Spanish wealth tax?

No. The wealth tax and the solidarity tax are outside the treaty entirely, are not creditable against U.S. tax, and have no equivalent on the U.S. side to offset them.

Is there a U.S. Spain estate tax treaty?

No. The two estate and inheritance systems operate independently with no treaty coordination.

Do I need to file a treaty position on Form 8833?

It depends on which position you are taking and its size. Some treaty-based return positions require disclosure and some are excepted. This is worth confirming rather than assuming, in either direction.

Ready to Talk Through Your Situation?

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Related reading: Working Remotely from Spain: What Americans Need to Settle Before They Go

Important disclosures

This article is general educational information published by Cross Border Wealth Advisors, a company of Gersten Financial Planning Inc. an investment adviser registered with the State of California (CRD 309890). Nothing in it is investment advice, tax advice, legal advice, or immigration advice, and nothing in it is an offer or solicitation to buy or sell any security.

Tax treaty interpretation depends entirely on your own facts, and treaty positions can require specific disclosure on a U.S. return. Several points in this article are expressly identified as unsettled or as open technical questions. Figures, rates and filing dates are stated as of the publication date shown above and may have changed since. Before acting on anything described here, consult a qualified professional about your own situation. Where this article says a point is unsettled or unconfirmed, that statement is deliberate and should be treated as a reason to seek advice rather than as a conclusion.

Cross Border Wealth Advisors is a fee-only firm and acts as a fiduciary to its advisory clients. The firm does not sell products and does not receive commissions. Registration with any state securities authority does not imply a certain level of skill or training.

No portion of this article should be read as a promise, guarantee or prediction of any particular tax, investment or planning outcome. Any calculation shown is a hypothetical illustration using round numbers for the purpose of demonstrating a mechanic. It is not a representation of any client’s experience, is not a projection of results, and does not reflect the performance of any actual account.

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About the Author

Victor Gersten, EA, CFP®, MS, MPAS™, is a fee-only fiduciary specializing in financial planning for Americans living in or moving to Spain. Victor founded Cross Border Wealth Advisors to serve Americans relocating to Spain, combining an Enrolled Agent’s tax expertise with comprehensive financial planning.

Works Cited

1. Convention between the United States of America and the Kingdom of Spain for the Avoidance of Double Taxation, 22 February 1990 (IRS)
2. Protocol amending the Convention, signed at Madrid 14 January 2013, in force 27 November 2019 (U.S. Department of the Treasury)
3. U.S. Department of State, entry into force notice for the 2013 Protocol
4. U.S. Treasury, Technical Explanation of the 2013 Protocol
5. IRS, Form 1116 instructions, certain income re-sourced by treaty
6. IRS, Estate and Gift Tax Treaties
7. IRS, Foreign Taxes That Qualify for the Foreign Tax Credit
8. Agencia Tributaria, residencia fiscal and country guidance for the United States
9. Dirección General de Tributos, consultas vinculantes V1291-22 and V0251-25