US Expat Taxes in Spain: How to File and Avoid Double Tax

Americans who move to Spain for a job transfer, a retirement on the coast, or a stint under the country's digital nomad visa quickly discover that two governments are now watching their income: the Agencia Tributaria in Spain and the IRS back home. US expat taxes in Spain are not optional and they are not automatic. Because Spain generally taxes its residents on worldwide income and the United States taxes its citizens and green card holders no matter where they live, an American living in Spain typically owes a filing obligation in both countries every year, and the entire planning exercise is about coordinating the two so the same income is never taxed twice.

Do US Citizens Living in Spain Have to File Both Spanish and US Tax Returns?

Yes, in almost every case. Spain taxes individuals who are resident there, generally meaning they spend more than 183 days in Spain during the calendar year or have their main center of economic or vital interests in the country, on their worldwide income through the Agencia Tributaria. The United States separately taxes its citizens and green card holders on worldwide income no matter where they live, a rule that has nothing to do with Spanish residency and everything to do with US citizenship or immigration status.

That means the two filing obligations run independently of each other. Filing and paying tax in Spain does not excuse you from filing a US Form 1040, and filing a US return does not excuse you from your Spanish obligations. The mechanisms that keep the same dollar of income from being taxed twice, the Foreign Earned Income Exclusion, the Foreign Tax Credit, and the US-Spain tax treaty, operate on the US side of that equation, not as a substitute for either filing.

How Does Spain Tax Residents on Worldwide Income?

Spain applies its personal income tax, the Impuesto sobre la Renta de las Personas Fisicas or IRPF, on a worldwide basis to anyone who qualifies as a Spanish tax resident, generally someone who spends more than 183 days in Spain during the calendar year or whose main center of economic activities or interests is located there. Employers withhold income tax directly from wages throughout the year, and residents owe Spanish tax on foreign-source income as well, including US wages, US investment income, and US retirement distributions.

Spain's progressive income tax combines a national scale with a regional component set by each autonomous community, and taken together the combined rate generally runs comparable to or higher than the equivalent US federal rate on employment income, though the exact figure depends on where in Spain you live and should be confirmed for the current year rather than assumed. Some new residents, particularly those moving to Spain for a qualifying job offer or under the country's digital nomad visa, may be eligible for a special inbound-worker regime commonly called the Beckham Law, which can allow a flat rate on Spanish-source employment income for a limited number of years instead of the standard progressive resident rates. Eligibility for that regime and its current-year mechanics are specific enough that they need to be evaluated with a professional before relying on them, not assumed from a general description.

Should You Claim the FEIE or the Foreign Tax Credit on Spanish Income?

For most Americans earning wages in Spain, the Foreign Tax Credit on Form 1116 is the stronger tool, because Spain's combined national and regional income tax generally runs comparable to or higher than the equivalent US federal rate on the same income. When that holds true, the credit can eliminate US tax on your Spanish-source income entirely and still leave unused credit on the table for a future year.

The Foreign Earned Income Exclusion on Form 2555 works differently: it excludes foreign earned income up to an annually indexed maximum, for example $130,000 for 2025, from US taxable income in the first place under IRC §911. That can be simpler for income under the cap, or for someone using Spain's Beckham Law regime where Spanish tax on employment income may run lower than the standard resident rates, but it comes with real costs. The FEIE does nothing for self-employment tax, claiming it can disqualify the refundable Additional Child Tax Credit for a family with kids, and once you revoke the election you generally cannot re-elect it for five years without IRS consent. The Foreign Tax Credit, by contrast, is computed by category under IRC §§901 and 904, and any credit you cannot use in the current year carries back one year and forward ten years on Schedule B of Form 1116, which you can use in a future year when your foreign taxes fall below the Form 1116 limit. Our FEIE versus Foreign Tax Credit comparison walks through the decision in more detail, and the two elections can also be combined across different income types in the same year.

What Does the US-Spain Tax Treaty Do for Double Taxation?

The United States and Spain have a comprehensive income tax treaty, in force since 1990 and modernized by a protocol that entered into force on November 27, 2019, updating provisions such as withholding rates and dispute resolution. Like nearly every US treaty, it contains a saving clause that lets the United States tax its own citizens and green card holders largely as if the treaty did not exist, so the domestic Foreign Tax Credit and Foreign Earned Income Exclusion mechanisms described above do most of the actual work of avoiding double taxation on wages.

Where the treaty matters most is in the details: tie-breaker rules for residency when someone could be considered a resident of both countries in the same year, reduced withholding on certain investment income, rules for business profits, and specific provisions touching pensions and government service income that can differ from the general rule. Because treaty provisions have to be read in their specific text, any position relying on a specific treaty article beyond the general saving-clause framework should be reviewed against the actual treaty language, as amended by the 2019 protocol, before you file.

Does the US-Spain Totalization Agreement Cover Social Security?

Yes. A totalization agreement between the United States and Spain has been in force since April 1, 1988, and it exists specifically to stop a worker from paying into both countries' social security systems on the same earnings at the same time. Without it, an American employee or self-employed person working in Spain could owe both Spanish social security contributions and US self-employment tax on the identical income.

The agreement works by assigning coverage to a single system based on where the work is performed and how long the assignment is expected to last, documented with a certificate of coverage. Depending on the direction of the assignment, the certificate is issued by the Social Security Administration, to keep someone covered under the US system while working temporarily in Spain, or by Spain's Tesoreria General de la Seguridad Social, to keep someone covered under the Spanish system. Self-employed Americans in Spain should not assume US self-employment tax automatically applies; our guide to totalization agreements and self-employment tax abroad covers how the certificate process works.

How Are Spanish Pensions and Retirement Accounts Taxed by the US?

Not automatically. Spain offers several distinct retirement vehicles: the state pension administered through the Seguridad Social system, and private or employer-sponsored options including planes de pensiones and unit-linked insurance products. Being tax-favored under Spanish law does not, by itself, make any of these tax-deferred for US purposes.

The general US rule, under the operation of IRC §§401(a) and 402(b), is that income accruing inside a foreign retirement plan is taxed currently to a US person unless a specific treaty provision defers it. Whether the US-Spain treaty, as amended by the 2019 protocol, provides that deferral, and for which type of Spanish plan, is fact-specific and has to be analyzed against the actual treaty text rather than assumed. Because the analysis is the same regardless of which country the plan is in, our foreign pension US tax treatment guide walks through the four questions that determine the answer for any foreign plan: whether growth is taxed as it accrues, whether a treaty defers it, what has to be reported, and how distributions are taxed.

Are Spanish Investment Funds Taxed as PFICs?

Usually, yes, and this is one of the more expensive surprises for Americans investing through a Spanish bank or broker. A Spanish fondo de inversion, whether a mutual fund, an actively managed fund, or many ETFs domiciled in Spain or elsewhere in the EU, typically meets the definition of a passive foreign investment company under IRC Section 1297, with Sections 1291 and 1298 governing the tax treatment. That classification is a matter of US tax law and does not turn on how the fund is taxed inside Spain under its own domestic rules.

Once a fund is a PFIC, the default US tax treatment is punitive: absent a timely election, gains and certain distributions are spread over your holding period, taxed at the highest rate in effect for each of those years, and hit with an interest charge on top. Each PFIC generally requires its own Form 8621 filing, and the reporting obligation applies even in a year where no tax is actually due. This is one of the clearest reasons Americans in Spain are usually steered toward US-domiciled brokerage accounts and US-based index funds for new investing rather than opening a local fondo de inversion through a Spanish bank.

What Else Do You Have to Report to the IRS?

Beyond the income tax return itself, Spanish financial accounts and investments carry their own separate information-reporting obligations that apply whether or not any US tax is owed. These filings are enforced on their own terms, and the penalties for missing them are typically far larger than any tax that would have been due.

Whether you even count as a US tax resident in the first place, if your situation is more complicated than straightforward citizenship, such as a long stay on a work or student visa before a move to Spain became permanent, is a separate question governed by the substantial presence test.

Bottom Line

Living in Spain does not simplify your US tax picture, it adds a second filing system on top of it. The Agencia Tributaria and the IRS operate independently, and the tools that prevent double taxation, primarily the Foreign Tax Credit given Spain's generally comparable-to-higher tax rates, along with the treaty's narrower provisions, the Beckham Law regime for qualifying new residents, and the totalization agreement for social security, have to be applied deliberately rather than assumed. Pensions, Spanish investment funds, and foreign accounts each carry their own reporting rules on top of the income tax analysis, and getting any one of them wrong tends to cost more in penalties than the underlying tax ever would have.

Have questions about US expat taxes in Spain? Contact TS CPA for a free consultation. We respond within the same day.

Official IRS and Government Sources

• IRS, Foreign Earned Income Exclusion
• IRS, Foreign Tax Credit
• IRS, US Citizens and Resident Aliens Abroad
• IRS, United States Income Tax Treaties A to Z
• Social Security Administration, US-Spain Totalization Agreement
• FinCEN, Report of Foreign Bank and Financial Accounts (FBAR)
• IRS, About Form 8621
• IRC Section 911, Citizens or Residents Living Abroad