US taxes while living in Spain: FBAR, FATCA and the tax treaty

Here's the point that ruins the plans of many Americans moving to Madrid: the US is still your country of origin fiscally even though you live in Spain. You're a US citizen, and that means the US taxes you on your worldwide income, regardless of where you generate it. If you're still planning your move, the complete guide for Americans relocating to Madrid covers visas, paperwork, and this tax issue in a single overview.

This isn't a legal problem, but it is an administrative one. And mistakes carry severe penalties.

The basics: double taxation

When you arrive in Madrid and live here more than 183 days, you have two governments taxing you: the US and Spain. Both believe you should pay them taxes on your worldwide income.

However, there is the Tax Treaty between the US and Spain (Income Tax Treaty). Its purpose is to prevent you from paying twice on the same income. How it works: if you pay taxes in Spain on Spanish income, the IRS (US tax service) gives you a credit for those taxes paid in your US return. Result: you pay once, usually at the higher rate between the two countries.

Example: you earn €60,000 working remotely for a US company from Madrid. Spain charges you 30% (€18,000). The US would also want to charge you 30% (another €18,000). But the treaty allows you to use the €18,000 paid in Spain as a credit against your US obligation. Result: you pay only €18,000 total.

But here's the catch: this works only if you file correctly in both countries. If you don't submit the US return properly, then you don't claim the credit, and you end up paying in both places.

The forms you must file

As an American living in Spain, you have four different tax obligations:

US income tax return (Form 1040). Every year, without exception, as long as you're a US citizen or resident. You file by mail to the IRS if you're abroad. The deadline is June 15 (two extra months compared to filing from within the US, but still early).

Spanish tax return. If you're a tax resident in Spain (more than 183 days), you file the Modelo 100 to the Ministry of Treasury. This includes all your worldwide income. The deadline is typically end of June.

FBAR (Financial Crimes Enforcement Network Form 114). If you have Spanish bank accounts that together exceed $10,000 USD at any point during the year, you must report them. This isn't a tax, it's a reporting form. It's filed online with FinCEN by April 15. Errors or failure to file carry massive penalties (up to $10,000 per unreported account, and they can accumulate). Many Americans in Spain don't know FBAR exists. Assume you need to file it.

FATCA (Foreign Account Tax Compliance Act). If you own foreign financial assets exceeding certain amounts ($200,000 for single individuals), you must report them on the FBAR form (yes, it's the same one). If you own more complicated assets (investment funds, foreign stocks, non-US real estate), you need additional forms like Form 8938. Many Spanish banks now report directly to the IRS anyway (FATCA agreement), so the IRS already knows you have money in Spain. Better that you declare it yourself in the correct form.

The Beckham Law: your fiscal lifeline

If you're a professional who arrives in Spain to work here (not remote for the US, but a worker in a Spanish company), you might qualify for the Beckham Law.

Beckham is a special taxation system that allows newly arrived high-skilled professionals to pay a flat 24% tax on Spanish income for the first 5 years (instead of the progressive rate that can reach 45%).

But there are strict conditions: you must be a "newly arrived professional" (not have resided in Spain in the past 10 years), you must have Spanish employment income (not remote income from the US), and you must apply to the tax authority within a certain timeframe.

Many remote Americans don't qualify because they work remotely for the US, not for Spain. But if your plan is to get a job in Madrid, Beckham is a total game-changer. We're talking $30,000-50,000+ USD saved in taxes over 5 years.

Foreign Earned Income Exclusion (FEIE)

Another option to reduce your US tax burden is FEIE (Foreign Earned Income Exclusion). It lets you exclude the first ~$120,000 of foreign earned income from your US federal return. This means the US only taxes you on income above $120,000.

Example: you earn €60,000 remotely. That's approx. $65,000 USD. With FEIE, the IRS says: "Ok, the first $65,000 I don't tax." Spain still charges you. But the US doesn't.

Caution: FEIE requires you to prove you spent more than 330 days outside the US (the "physical presence test"), or that you're a resident of another country for tax purposes. Living in Madrid with a rented apartment satisfies this, but you must have documentation.

FEIE and foreign tax credits are different. Some years it benefits you to use one, other years another. Your US tax advisor decides.

What you should do

1. Hire a US tax advisor specializing in expats. Not a Spanish advisor, not a general accountant. Someone who has handled FBAR, FATCA, and the tax treaty. It costs around $1,500-3,000 annually but pays for itself through optimization.

2. Open Spanish bank accounts but declare all assets. Don't try to "hide" money in Spain. The IRS knows you have an account in Madrid. Better to declare it yourself than have the bank report it and you get a surprise.

3. Understand when to file. Deadlines: US (Form 1040) by June 15 if you're abroad. FBAR by April 15 (no automatic extension, unlike the 1040). Spain by approximately June 30 (varies).

4. Keep receipts of taxes paid in Spain. You'll need them to claim credits in the US.

5. If you change residence status (arrivals, departures, visa changes), report it. Changes in tax residency trigger different reporting obligations.

It's complex, but manageable with the right advice. The critical mistake is assuming "I now live in Spain, I forget my US taxes." It doesn't work that way. The US follows you for life with tax debts.

At Aedara we coordinate with specialist expat tax advisors who work with Americans in Madrid regularly. If you're planning a move to Spain and want to understand your fiscal obligations from the start, tell us about your situation.