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Which banks actually work for Americans, why Social Security gets treated differently than almost anywhere else, and the two Spain-specific filings most guides gloss over.
FATCA makes a subset of Spanish banks genuinely reluctant to take on US citizens, and Spain layers two paperwork obligations most retirement destinations don't have: Modelo 720 (foreign-asset reporting) and a real, if regionally variable, wealth tax. None of this is disqualifying, but it changes what "doing your taxes" actually means here.
Opening the account, in order
- 1. NIE: Spain's foreign-resident ID and tax number, obtained through a Spanish consulate or in-country once you land, needed before most financial and legal steps.
- 2. Starter account: the "Big 4" (Santander, BBVA, CaixaBank, Sabadell) generally accept US citizens, though expect heavier paperwork and W-9 collection because of FATCA. Neobanks Revolut and Bunq have built more streamlined FATCA-compliant onboarding for Americans; N26 requires you to already be a Spanish resident before it will open an account.
- 3. Upgrade: once your TIE (residency card) is issued, move to a full resident account with better terms than the non-resident starter product.
Moving money without losing a chunk of it
- Smaller transfers: fintech transfer services like Wise typically beat a standard bank wire on fees for routine monthly transfers.
- Larger transfers: flat-fee bank wires start winning the percentage game above a certain size, the exact crossover point varies by bank and isn't a fixed Spain-specific number, compare both before you move a large lump sum.
- Timing: EUR/USD moves enough across a year that batching larger transfers around favorable weeks is worth a few minutes' attention, not active currency trading.
The filing obligations that don't go away, and the two that are genuinely Spain-specific
- FBAR/FATCA: US foreign-account reporting continues regardless of residency, this doesn't disappear because you moved.
- Modelo 720: a mandatory Spanish declaration of foreign assets (bank accounts, brokerage and retirement accounts, real estate) once any single category exceeds €50,000, filed each year between January 1 and March 31 for the prior December 31 snapshot. It carries no tax of its own, it's purely informational, but the reporting duty is real: the EU Court of Justice ruled in January 2022 that Spain's original penalty regime (150% surcharges, no statute of limitations) was disproportionate and illegal, and Spain reduced the penalties under Law 5/2022 that March. The obligation to file remains in force today under the ordinary Spanish tax-penalty rules, skipping it is not a minor paperwork miss.
- Wealth tax (Patrimonio): Spain is one of the few European countries with a standalone wealth tax on worldwide net assets above €700,000 (with a €300,000 exemption for a primary residence). Where you register matters more than most people expect: Madrid and Andalusia (along with Cantabria, La Rioja, Extremadura, and Murcia) apply a 100% regional relief, meaning a resident there owes nothing in regional wealth tax as long as net worth stays under the separate €3 million national Solidarity Tax threshold, which overrides the relief above that level. Other regions, including Valencia (which raised its own exemption to €1 million for 2026) and Catalonia, don't offer the same blanket relief. Most retirees moving on Social Security and a typical IRA balance will land well under these thresholds either way, but it's worth knowing the number exists before assuming Spain has "no wealth tax" the way some neighboring countries do.
- State tax domicile: some US states (California and New York among them) don't release residency ties easily, worth addressing before the move, not after.
Worked tax examples
Scenario A
Single, Social Security only
Annual income$28,800 SS
Est. US tax$0
Est. Spain tax$0
Under Article 21 of the US-Spain tax treaty, US Social Security is taxable only in the United States, an unusually retiree-friendly quirk (most US treaties let the residence country tax it too). Spain still requires you to declare it for rate-setting purposes even though it isn't taxed directly.
Scenario B
Couple, SS + IRA withdrawal
Annual income$60K SS + $40K IRA
Est. US tax~$6,000
Est. Spain tax~$9,000
Under Article 17, private pension and IRA distributions are generally taxable primarily where you live, i.e. Spain, at Spain's progressive rates (roughly 19–47% combined national and regional). The US may still withhold at source unless you file a W-8BEN; a foreign tax credit prevents true double taxation, but the total bill can run higher than a US-only comparison suggests.
Scenario C
Couple, SS + US rental income
Annual income$50K SS + $25K rental
Est. US tax~$2,500
Est. Spain tax~$4,000
Keeping US rental property alive keeps a US filing obligation alive too. Spain taxes worldwide income including foreign rental income and doesn't mirror US depreciation rules, a common surprise for retirees who assumed the same deductions would carry over.
Scenario D
Roth conversion, year before the move
Conversion amount$80K, last US tax year
Est. US tax~$14,600
Est. Spain tax$0, not yet resident
Converting while still a full-year US tax resident, before Spanish tax residency starts (Spain uses the same 183-day-a-year threshold most countries do), is why timing the move matters as much as the number itself.
Where the estimates above tend to breakModelo 720, the wealth tax's regional patchwork, and Article 17's pension-sourcing rules mean the two systems interacting for a full year is genuinely harder to model than either system alone, not because either tax code is unusually harsh on its own. That's usually the point where people stop trying to file both countries' returns themselves. If your income mix looks like any of the four scenarios above, that's a reasonable moment to get a quote from a cross-border preparer, not a reason to panic.
Illustrative 2026 estimates. Not tax advice, confirm your numbers with a cross-border CPA.