Does Spain Have a Tax Treaty With the US? Coverage and Filing

Yes. The United States and Spain have had an income tax treaty in force since 1990, formally the Convention for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Income.¹ A 2013 Protocol modernized the agreement, cutting withholding rates on many types of investment income and revising how Social Security and pensions are treated.² The treaty reaches nearly every kind of income that crosses the two countries — wages, pensions, dividends, interest, royalties, real estate, and capital gains.

What the Treaty Covers

On the US side, the treaty applies to federal income taxes under the Internal Revenue Code.¹ On Spain’s side, it covers the personal income tax (IRPF), the corporation tax, and the wealth tax.³

Social Security and Medicare taxes are not part of this treaty. They are handled by a separate bilateral totalization agreement, which keeps workers from paying into both countries’ social security systems at once.⁴ A US employer sending an employee to Spain can request a Certificate of Coverage (Form USA/E 1) from the Social Security Administration’s Office of International Programs in Baltimore; that certificate exempts the worker from Spanish social security contributions during the assignment.⁵ Workers exempted this way generally cannot draw Spanish benefits like public health coverage or unemployment, so alternative coverage matters.

Reduced Withholding on Dividends, Interest, and Royalties

Without a treaty, the US withholds tax at 30 percent on investment income paid to a foreign person. The treaty knocks that rate down substantially for residents of either country who qualify.

Dividends are capped at two tiers. If the beneficial owner is a company holding at least 25 percent of the voting stock of the payer, the maximum rate is 10 percent. For everyone else, including individual shareholders, the cap is 15 percent.⁶ The 2013 Protocol went further, eliminating withholding entirely on certain intercompany dividends.²

Interest and royalties saw the biggest change. The 2013 Protocol generally eliminated withholding on cross-border interest and royalty payments between US and Spanish residents.² Narrow exceptions still exist — contingent interest tied to a debtor’s profits, for example — but for typical arm’s-length loans and standard licensing arrangements the effective rate is zero.

Who Counts as a Resident

Residency drives everything else in the treaty because it decides which country has primary taxing rights over your worldwide income. Each country starts with its own domestic rules.

Spain treats you as a tax resident if you spend more than 183 days in the country during a calendar year. Short trips out of Spain still count toward that total unless you can prove tax residency somewhere else.⁷ Once you are a Spanish resident, Spain taxes your worldwide income.³

When both countries claim you, Article 4 of the treaty runs a sequence of tie-breaker tests. They apply in strict order; the first one that produces a clear answer ends the inquiry.

Permanent home. You are a resident of whichever country where you have a home available for your personal use.
Center of vital interests. If you have a home in both countries, residency goes where your personal and economic ties are closer — family, work, main bank accounts and investments.
Habitual abode. If vital interests do not break the tie, residency goes to the country where you spend more time.
Nationality. If time spent is equal or impossible to measure, citizenship decides.
Mutual agreement. If nothing above resolves it, the two tax authorities negotiate.⁷

How the Treaty Splits Up Different Kinds of Income

Real Estate

Rental income and gains from selling real estate are taxable in the country where the property sits. A US resident renting out an apartment in Barcelona owes Spanish tax on that rent first. The rule also reaches gains on shares in a company whose value comes mainly from Spanish real estate.⁸

Business Profits

A US company owes Spanish tax on its business profits only if it operates through a permanent establishment in Spain — typically a branch office, factory, workshop, or other fixed place of business. Without that physical presence, the profits are taxable only in the US.⁹ The rule works the same in reverse for a Spanish company earning in the US.

Remote work is a gray area. If a US company’s employee works from Spain by personal choice, without the employer directing them there, providing office space, or having them negotiate contracts from Spain, that arrangement generally does not create a permanent establishment. The risk climbs when the remote worker is the company’s sole owner or decision-maker, since Spanish authorities may argue the business effectively operates wherever that person is.

Capital Gains

Article 13 splits capital gains by asset type:

Real property is taxable in the country where it sits.
Shares in a company whose assets are mainly real property in one country: that country can tax the gain.
Business assets tied to a permanent establishment: taxable where the establishment is.
Significant shareholdings — at least 25 percent of a company’s capital held within the 12 months before the sale — can be taxed by the country where the company is resident.
All other property: taxable only in the seller’s country of residence.⁸

For most individual investors, this means selling stocks or other financial assets outside those specific situations triggers tax only where you live.

Private Pensions and Annuities

Distributions from private retirement arrangements earned through past employment — 401(k)s, IRAs, and similar plans — are taxable only in the country where you live when you receive them. Retire to Spain and draw from a US private pension, and Spain taxes it, not the US.¹⁰ Annuities follow the same rule.²

Social Security Benefits

Government-funded Social Security payments run the opposite direction: they are taxable only in the country that issues them. US Social Security collected by someone living in Spain remains taxable in the US. Spanish social security collected in the US is taxable only by Spain.¹⁰

Alimony and Child Support

Alimony is taxable only in the country where the recipient lives. Child support is taxable only in the country where the payer lives.¹⁰

Why US Citizens Still File With the IRS: The Savings Clause

Article 1, Paragraph 3 contains a savings clause, a standard feature of nearly all US tax treaties.¹¹ It preserves the US right to tax its citizens and residents on worldwide income as if the treaty did not exist. So a US citizen living in Spain still files a federal return reporting all global income, regardless of what a given treaty article says about which country can tax a specific item.¹²

Paragraph 4 carves out limited exceptions, including provisions related to pensions, double-taxation relief, non-discrimination, and the mutual agreement procedure.¹¹ The pension carve-out matters: even though the savings clause otherwise lets the US tax its citizens globally, the treaty’s pension rules still apply to them.

The practical takeaway for a US citizen in Spain: relief from double taxation comes mostly through a foreign tax credit on the US return for taxes paid to Spain, not through an outright treaty exemption from US tax.

How Double Taxation Actually Gets Relieved

Article 24 requires each country to let its residents credit taxes paid to the other country against their domestic tax bill.¹³ On the US side, you claim the credit by filing IRS Form 1116 with your federal return. Form 1116 calculates the foreign tax you paid and the credit you can use against US tax on the same income.¹⁴ Because the savings clause keeps US citizens on the hook for worldwide income, this credit is the main tool that keeps them from paying full tax twice.

One asymmetry is worth knowing. Spain grants a credit for US tax only when the US taxed the income for a reason other than citizenship — for example, because the income has a US source. When the US taxes a citizen’s income solely because of the savings clause, Spain is not obligated to give a credit for that US tax. Relieving the double hit falls to the US foreign tax credit in that situation.³

What You Have to File to Claim Treaty Benefits

Form 8833

If you take a position on your US return that relies on the treaty to reduce or eliminate a tax, you must attach IRS Form 8833 for each such position.¹⁵ Missing the form triggers a $1,000 penalty per failure, or $10,000 for a C corporation.¹⁶

Residency Certificates

To claim reduced withholding at the source — say, on US dividends paid to a Spanish resident — you need official proof of residency. Spanish residents get a Certificado de Residencia Fiscal from the Agencia Tributaria and hand it to the US payer. US residents needing to prove residency to Spanish authorities request Form 6166 from the IRS.¹⁷ Without the certificate, payers usually apply the higher default rate.

Form 1116

US taxpayers who pay Spanish tax and want the credit file Form 1116 with the federal return, along with records of the foreign taxes paid, the income category, and the source of each item.¹⁴ The credit is limited to the US tax attributable to your foreign-source income, so it cannot offset US tax on domestic income.

Reporting Obligations the Treaty Does Not Waive

The treaty reduces double taxation, but it does not touch the separate reporting rules for foreign accounts. A US person with financial accounts in Spain still has to file them.

If the combined value of all your foreign financial accounts — Spanish bank accounts, investment accounts, and certain insurance policies — exceeds $10,000 at any point during the year, you file an FBAR electronically with FinCEN. The deadline is April 15, with an automatic extension to October 15.¹⁸

Form 8938 under FATCA is a separate IRS filing with higher thresholds that vary by where you live and how you file:¹⁸

Living in the US, filing single: total foreign asset value over $50,000 on the last day of the year, or $75,000 at any time during the year.
Living in the US, filing jointly: over $100,000 on the last day, or $150,000 at any time.
Living abroad, filing single: over $200,000 on the last day, or $300,000 at any time.
Living abroad, filing jointly: over $400,000 on the last day, or $600,000 at any time.

Form 8938 is attached to your annual return and follows the same due date. The US and Spain also have a bilateral FATCA agreement, so Spanish financial institutions report US-person account information directly to the IRS.¹⁹

1
IRS. Income Tax Convention With Spain, With Protocol
2
U.S. Government Publishing Office. Senate Executive Report 113-10 – Protocol Amending the Tax Convention With Spain
3
Agencia Tributaria. Residents’ Brochures With Foreign Income – The United States
4
Social Security Administration. Totalization Agreement With Spain
5
Social Security Administration. Agreement Between the United States and Spain
6
IRS. Income Tax Convention With Spain, With Protocol – Article 10
7
Agencia Tributaria. Individual Resident in Spain
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IRS. Income Tax Convention With Spain, With Protocol – Article 13
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IRS. Income Tax Convention With Spain, With Protocol – Article 7
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IRS. Income Tax Convention With Spain, With Protocol – Article 20
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IRS. Income Tax Convention With Spain, With Protocol – Article 1
12
Internal Revenue Service. United States Income Tax Treaties – A to Z
13
IRS. Income Tax Convention With Spain, With Protocol – Article 24
14
Internal Revenue Service. Instructions for Form 1116
15
IRS.gov. Form 8833 Treaty-Based Return Position Disclosure
16
Office of the Law Revision Counsel. 26 USC 6712 – Failure to Disclose Treaty-Based Return Positions
17
Internal Revenue Service. Form 6166 Certification of US Tax Residency
18
Internal Revenue Service. Comparison of Form 8938 and FBAR Requirements
19
Treasury. Agreement Between the United States of America and the Kingdom of Spain to Improve International Tax Compliance and to Implement FATCA