Moving to Spain does not end your US tax obligations. The United States taxes its citizens on worldwide income no matter where they live, so you keep filing a Form 1040 every year. On top of that, you must report your Spanish bank accounts (FBAR/FinCEN 114) and often your foreign assets (FATCA/Form 8938). Spain adds its own Modelo 720 disclosure. Double taxation is usually avoidable with the treaty and foreign tax credits, but only if the forms are done right.
Most Americans who relocate to the Costa del Sol discover their US tax problem after they have already opened a Spanish bank account, bought an apartment, or been dropped by a US brokerage. This guide explains the four moving parts nobody puts in one place: citizenship-based taxation, the FBAR, FATCA, and the FEIE-versus-Foreign-Tax-Credit decision, plus the Spanish reporting form (Modelo 720) that trips up new residents. It is written for the person who is compliant in the US, assumes moving abroad simplifies things, and is about to find out it does the opposite.
Why does the US still tax you after you move to Spain?
The United States is the only major economy that taxes on the basis of citizenship rather than residence. (Eritrea is the only other country that does this, which tells you how unusual it is.) Every other developed country, Spain included, taxes people based on where they live. Once you are a US citizen or green-card holder, the IRS follows you to Fuengirola, Marbella, or anywhere else.
That means two tax systems apply to you at once:
- The IRS taxes your worldwide income because you are a US citizen.
- Spain taxes your worldwide income because, once you spend more than 183 days in the country in a calendar year, you become a Spanish tax resident and file the Spanish return (Modelo 100).
This is the core of the problem: you are inside both systems at once. The good news is that the US and Spain have a tax treaty and a set of mechanisms (foreign tax credits, exclusions) designed to stop you paying full tax twice on the same income. The bad news is that these only work when claimed correctly on the right forms, and the reporting forms carry punishing penalties even when you owe zero tax.
What US tax forms do Americans in Spain actually have to file?
Here is the realistic short list for a typical American living in Spain. Not everyone files all of these, but most file more than they expect.
| Form | What it is | Who files it | 2026 trigger |
|---|---|---|---|
| Form 1040 | US federal income tax return | Essentially every US citizen abroad above the filing threshold | Income above the standard deduction (Single $16,100; MFJ $32,200) |
| FinCEN Form 114 (FBAR) | Report of foreign bank/financial accounts | Anyone with foreign accounts | Aggregate balance over $10,000 at any point in the year |
| Form 8938 (FATCA) | Statement of specified foreign financial assets | Higher-asset filers | Foreign assets over $200,000 (single, abroad) — see below |
| Form 2555 | Foreign Earned Income Exclusion (FEIE) | Employees/self-employed with earned income | Optional election to exclude up to $132,900 |
| Form 1116 | Foreign Tax Credit | Anyone crediting Spanish tax against US tax | Optional; usually the better choice in Spain |
| Form 8621 | PFIC reporting | Owners of Spanish/EU mutual funds and ETFs | Holding almost any non-US pooled fund |
Sources: IRS 2026 inflation adjustments; IRS FEIE; IRS Form 8938.
The two that catch people off guard are the FBAR and Form 8938, because they are information returns: you file them even if you owe no tax, and the penalties for missing them are wildly out of proportion to the tax at stake.
What is the FBAR, and why does the $10,000 threshold catch everyone?
The FBAR (Foreign Bank Account Report, filed as FinCEN Form 114) is not filed with your tax return. It goes electronically to the Financial Crimes Enforcement Network through the BSA E-Filing System. You must file it if the combined high balance of all your foreign financial accounts exceeded $10,000 at any point during the year.
Three things make this threshold sneakier than it sounds:
- It is aggregate, not per-account. Three accounts that each peaked at $4,000 add up to $12,000, so all three must be reported.
- It is based on the maximum balance, not the year-end balance. If your account hit $15,000 in June when a property deposit landed and dropped to $500 by December, you still have to file.
- It counts accounts you do not think of as “yours.” A Spanish joint account with a spouse, or an account you have signature authority over (a business or a relative’s account), can pull you in.
For a household that has moved to Spain, cleared a property purchase through a Spanish bank, and keeps a current account for living expenses, crossing $10,000 is almost automatic.
Deadline: The FBAR is due April 15, with an automatic extension to October 15 (no form required).
Penalties (2026, inflation-adjusted):
| Violation | Penalty |
|---|---|
| Non-willful | Up to $16,536 per violation |
| Willful | Greater of $165,353 or 50% of the account balance, plus possible criminal exposure |
These figures are adjusted for inflation annually; confirm the current amounts before relying on them. A form that costs nothing to file, and generates no tax, carries five-figure penalties if ignored.
What is FATCA, and how is Form 8938 different from the FBAR?
FATCA (the Foreign Account Tax Compliance Act) is why your Spanish or US bank keeps asking whether you are a “US person,” and why some US brokerages close accounts for clients who move abroad. Under FATCA, foreign banks report US account holders to the IRS. Your side of FATCA is Form 8938, filed with your 1040.
People assume the FBAR and Form 8938 are the same filing. They are not. The FBAR goes to FinCEN, Form 8938 goes to the IRS, the thresholds differ, and you often have to file both for the same accounts.
| FBAR (FinCEN 114) | Form 8938 (FATCA) | |
|---|---|---|
| Filed with | FinCEN (separate e-file) | IRS, attached to Form 1040 |
| Threshold (single, living abroad) | $10,000 aggregate, any time | $200,000 year-end / $300,000 any time |
| Threshold (married joint, abroad) | $10,000 aggregate | $400,000 year-end / $600,000 any time |
| Covers | Financial accounts | Accounts plus foreign securities, some entity interests |
| Penalty | Up to $16,536 non-willful | $10,000, rising to $50,000+ for continued failure |
Note the higher Form 8938 thresholds for Americans living abroad, considerably more generous than the $50,000 that applies to US residents. But if you own a Spanish investment portfolio, hold property through a company, or have a large pension transfer sitting in a foreign account, you can cross the line. And because the two regimes overlap, the standard advice is: assume you may need both, and let a preparer confirm you do not.
Sources: IRS FATCA summary; IRS Form 8938 thresholds.
FEIE vs Foreign Tax Credit: which one saves an American in Spain more money?
This is where the real money sits, and where a US-Spain specialist earns their fee. You have two main tools to avoid being taxed twice on the same income:
1. The Foreign Earned Income Exclusion (FEIE), Form 2555. For 2026 you can exclude up to $132,900 of foreign earned income (wages, self-employment), up from $130,000 in 2025. A married couple who both qualify can exclude up to $265,800 combined. But the FEIE only covers earned income. It does nothing for pensions, dividends, interest, rental income, or capital gains.
2. The Foreign Tax Credit (FTC), Form 1116. This gives you a dollar-for-dollar US tax credit for income tax you actually paid to Spain. It works on almost all income types, earned or not.
Here is the point almost nobody explains up front: for most Americans in Spain, the Foreign Tax Credit is the better tool, because Spanish income tax rates are generally higher than US rates. On the Costa del Sol (Andalucía), the combined state-and-regional IRPF scale for 2026 runs like this:
| Taxable income (€) | Combined Andalucía marginal rate |
|---|---|
| Up to 12,450 | 19% |
| 12,450 – 13,000 | 21.5% |
| 13,000 – 20,200 | 24% |
| 20,200 – 21,100 | 27% |
| 21,100 – 35,200 | 30% |
| 35,200 – 60,000 | 37% |
| 60,000 – 300,000 | 45% |
| Over 300,000 | 47% |
Because you are already paying Spain at these rates, the FTC usually generates more credit than you owe the IRS, often wiping out your US tax on Spanish-taxed income and leaving carryover credits for future years. Choosing the FEIE instead can actually be worse: it removes the excluded income from the calculation, can strip you of credits and certain child-related benefits, and once you revoke the FEIE you generally cannot re-elect it for five years without IRS permission. The election binds you for years, and getting it wrong is expensive.
How does the US-Spain tax treaty actually prevent double taxation?
The US-Spain income tax treaty (originally 1990, with a modernizing protocol that entered into force on 27 November 2019) is the backbone of double-tax relief. It reduces withholding on cross-border dividends, interest, and royalties, and Article 24 provides the relief-from-double-taxation mechanism.
But there is a catch every American should understand: the saving clause. The treaty lets the US “save” the right to tax its own citizens as if the treaty did not exist. So you cannot simply wave the treaty and tell the IRS to leave you alone because you live in Spain. Article 24 (relief from double taxation) is specifically carved out from the saving clause, which is why the credit mechanism still works. Many other treaty articles, though, do not help a US citizen the way they would help a non-citizen.
The practical consequences that surprise people:
- US-source income can be taxed by the US first, then you claim relief on the Spanish side, the opposite order from what you might expect. This “re-sourcing” is a common source of errors.
- US retirement accounts (401(k), IRA, Roth) interact with Spanish tax in ways that are not intuitive, and Spain does not always recognize the US treatment.
- Social Security is covered by a separate US-Spain totalization agreement (in force since 1988) that stops you paying into both systems on the same earnings. A new totalization agreement signed on 8 April 2023 is set to replace the current 1986 agreement, but it has not yet entered into force and its text has not been published. Until it does, the existing five-year secondment limit continues to apply.
What is Modelo 720, and does it apply to you?
Modelo 720 is the Spanish mirror image of the FBAR/FATCA regime, and it is the form new residents most often miss because they are focused on the US side. Once you are a Spanish tax resident, you must declare foreign assets to the Agencia Tributaria if any of three categories exceeds €50,000:
- Foreign bank accounts
- Foreign securities, investments, and life insurance
- Foreign real estate
Each category has its own independent €50,000 threshold. The deadline is 31 March for assets held on the previous 31 December. After the first filing, you only re-declare a category if its value grew by more than €20,000 or you closed/opened a position. Non-residents do not file Modelo 720; it is purely a residency obligation.
For an American, this means your US 401(k), your US brokerage account, and your US home can all be reportable to Spain. The penalty regime was historically brutal until the European Court of Justice struck it down in January 2022 (Case C-788/19) as disproportionate; Spain reformed it via Ley 5/2022. The obligation itself remains fully in force, and it sits alongside your US FBAR and Form 8938 rather than replacing them.
Why is a general US CPA not enough, and what does a US-Spain specialist actually do?
Why pay for specialization? Because a competent US CPA who has never handled an expat file can prepare a clean domestic 1040 and still walk you into a five-figure problem. The cross-border traps are invisible from inside the US system:
- PFICs. Almost every Spanish or EU mutual fund and ETF is a “Passive Foreign Investment Company” under US law. These carry punitive tax rates and a separate form (8621) per fund. A local gestor who tells you to buy a Spanish index fund is, unknowingly, creating a US tax nightmare. A generalist CPA often does not spot it until years later.
- The FEIE-vs-FTC election as a multi-year strategy, not a one-year checkbox.
- US-source vs Spanish-source re-sourcing under the treaty, so credits actually land.
- Coordinating the FBAR, Form 8938, and Modelo 720 so the two governments see consistent numbers.
- Streamlined Filing Compliance Procedures, the IRS amnesty program for Americans who genuinely did not know they had to file. It can waive penalties entirely if you come forward before the IRS finds you.
This is why cross-border filers keep a specialist on a recurring basis. Expect a US-Spain CPA or Enrolled Agent retainer of roughly $800–$3,000 per year (a market estimate based on published firm pricing, not an official figure) for a typical household, more with rental property, self-employment, or investment portfolios, plus a separate one-off fee for catch-up filings under the Streamlined program. Set that against FBAR penalties starting at $16,536 per unfiled report (willful penalties can be measured against each account’s balance) and the retainer starts to look like cheap insurance.
How do you get compliant? A step-by-step
- Establish your residency dates. Count your days in Spain. Crossing 183 days in a calendar year makes you a Spanish tax resident and starts the Modelo 100 and Modelo 720 clocks.
- Inventory every account and asset, US and Spanish, with each one’s peak balance for the year. You need maximums, not year-end figures.
- Determine which US information returns apply: FBAR (over $10,000 aggregate), Form 8938 (over the abroad thresholds), Form 8621 (any foreign funds).
- Model FEIE vs Foreign Tax Credit for your specific income mix before filing. This is the decision that moves the most money.
- File the FBAR through BSA E-Filing (due 15 April, auto-extended to 15 October) and attach the FATCA and income forms to your 1040.
- File Modelo 720 in Spain by 31 March if any category exceeds €50,000.
- If you have missed prior years, ask a specialist about the Streamlined Filing Compliance Procedures before contacting the IRS. The amnesty is only available while your non-compliance is still “non-willful” and undiscovered.
Frequently asked questions
Do I have to file US taxes if I earn all my income in Spain and pay Spanish tax? Yes. US citizens file a Form 1040 on worldwide income regardless of where they live or where the income arises. You usually will not owe US tax after applying the Foreign Tax Credit, but the filing obligation stands, and the FBAR/FATCA information returns are separate from it.
Will I actually be taxed twice on the same income? Usually not. Between the Foreign Tax Credit, the FEIE, and the treaty, most Americans in Spain eliminate US tax on income already taxed by Spain. Double taxation typically only appears with US-source passive income, certain retirement distributions, and investment structures, exactly the areas where specialist help pays off.
What happens if I have never filed an FBAR and I have lived in Spain for years? You are likely a candidate for the IRS Streamlined Filing Compliance Procedures, which can eliminate penalties for non-willful failures if you come forward proactively. Do not simply start filing this year and ignore the back years; get advice on the amnesty route first.
Does my Spanish spouse have to file US forms? Only if they are a US person, or if you elect to treat them as a US taxpayer (which is sometimes advantageous, sometimes a trap). Their accounts can, however, become reportable on your FBAR if they are jointly held or you have signature authority.
Are my Spanish index funds and ETFs a problem? Very likely yes. As PFICs they trigger punitive US tax and Form 8621 reporting. This is one of the most common and costly mistakes Americans make after arriving. Check before you buy, not after.
Is the €50,000 Modelo 720 threshold per account or total? Per category. Each of the three categories (accounts; securities/insurance; real estate) has its own independent €50,000 threshold measured at 31 December.
Disclaimer
This article is general information for US citizens and green-card holders living in or moving to Spain. It is not tax, legal, or financial advice, and it does not create a professional relationship. Tax figures, thresholds, and penalty amounts change and are inflation-adjusted; confirm them against the primary sources before relying on them. Do not act on this article alone. US-Spain cross-border taxation is high-stakes and fact-specific. Engage a US-licensed CPA or Enrolled Agent who specializes in US-Spain filing, and a Spanish asesor fiscal, before making decisions.
Related reading:
- Modelo 720 and 721: reporting foreign assets and crypto as a US person in Spain
- The Beckham Law explained: is Spain’s special expat tax regime right for you?
- The cost of buying property in Málaga as an American: a neutral buyer’s cost breakdown
- Opening a Spanish bank account as a US citizen: getting past the FATCA hurdle
- Spain’s wealth tax: what expat owners and residents actually owe
Sources: IRS 2026 inflation adjustments; IRS Form 8938 requirements; IRS FATCA summary; IRS FBAR guidance; IRS Foreign Earned Income Exclusion; US-Spain income tax treaty text (IRS); Agencia Tributaria: Modelo 720; Spain-US treaty protocol in force (2019). Figures current as of the 2026 tax year; verify against primary sources before filing.