Tax Residency in Spain: Legal Guide for US, UK and European Expats

Many international clients arrive in Spain believing that staying fewer than 183 days per calendar year will keep them safely outside the Spanish tax net. This is a dangerous half-truth. Spanish law (Article 9 of the Personal Income Tax Act — LIRPF) establishes three independent tests for determining tax residency. Meeting any single one of them is sufficient to make you a Spanish tax resident for the entire tax year.

Test 1: The 183-Day Rule

You are deemed a Spanish tax resident if you spend more than 183 days in Spain during a calendar year (1 January to 31 December). Days of temporary absence are generally counted as Spanish days unless you can demonstrate habitual residence in another country. Importantly, Spain counts days of presence — including partial days of arrival and departure.

Test 2: Habitual Residence (Residencia Habitual)

Even if you spend fewer than 183 days in Spain, you may still be deemed resident if Spain is your habitual place of residence. This is a factual assessment looking at where you actually live on a day-to-day basis — where your family is, where your permanent home is, your social ties, the location of your regular activities. Moving to Spain part-time but maintaining your "base" there can satisfy this test even without 183 days.

Test 3: Centre of Economic Interests

You are also a Spanish tax resident if the base or main centre of your economic activities or interests is located in Spain. This catches entrepreneurs, investors and executives whose primary business operations, assets or income sources are Spanish — even if they personally spend limited time in the country.

Key point: Spain applies all three tests, and satisfying any one of them makes you a Spanish tax resident. There is no minimum time requirement if your economic interests or habitual residence are in Spain. This surprises many clients who believed counting days was sufficient.

Spain's Wealth Tax and the "Solidarity Tax"

Since 2023, a national Solidarity Tax on Large Fortunes (Impuesto Temporal de Solidaridad de las Grandes Fortunas) applies to net worldwide assets above €3 million at rates of 1.7–3.5%. This was introduced partly to backstop regions like Madrid that had effectively zero-rated their regional wealth tax. Whether this remains in force beyond 2025 is under active political debate.

Model 720: Foreign Asset Reporting

The Model 720 is an informative declaration (not a payment), but non-filing or incomplete filing historically carried extreme penalties. Following a 2022 European Court of Justice ruling that the original penalty regime violated EU law, the regime was reformed — but the filing obligation itself remains. Failure to file on time can still result in penalties, and assets undisclosed in the Model 720 may be presumed to be unjustified capital gains if discovered.

Spain has concluded over 100 Double Taxation Agreements (DTAs). These treaties are fundamental tools for international clients and take precedence over domestic Spanish law in most respects.

US–Spain Double Tax Treaty

The US–Spain DTA (1990, amended by protocol) contains a residence tie-breaker in Article 4. The hierarchy of tests is: permanent home available to the individual → centre of vital interests → habitual abode → nationality. Because the US taxes its citizens regardless of residence, additional treaty provisions (the savings clause) preserve US taxing rights even where Spain has primary residency. US citizens in Spain must therefore file in both countries and use the Foreign Tax Credit (Form 1116) or Foreign Earned Income Exclusion (Form 2555) strategically to avoid double taxation.

UK–Spain Double Tax Convention

The UK-Spain DTC (2013) has a similar tie-breaker structure. Post-Brexit, the UK is no longer part of the EU, which has implications for certain EU law protections that previously applied to UK nationals in Spain. The treaty remains in force and provides important relief on pensions, dividends, interest and capital gains — but the interaction with Spain's Beckham Law regime requires careful analysis.

Germany–Spain Doppelbesteuerungsabkommen (DBA)

The Germany–Spain DBA (2011) is a modern, OECD-based agreement. It is particularly relevant for German entrepreneurs and retirees in Spain, and for German employees of companies with operations in both countries. The Wegzugsteuer (exit tax) implications of moving to Spain must be considered before any move is finalised.

• Residency risk assessment: We analyse your specific situation under all three Spanish tests and any applicable treaty to give you a clear opinion on your current residency status — before the AEAT does.
• Pre-move planning: For those considering a move to Spain, we map the full tax consequences — including exit tax in your home country, timing of the move relative to the tax year, and whether the Beckham Law regime would apply to you.
• Certificate of Fiscal Residency: We handle the application for your Certificado de Residencia Fiscal and ensure that the supporting documentation is robust enough to withstand challenge.
• Model 720 and compliance: We prepare and file your Model 720 declaration and advise on the treatment of each category of foreign asset, including trusts, pension accounts, ISAs and offshore investment structures.
• Dual-filing coordination: For US and UK clients, we coordinate Spanish IRPF and home-country filing to ensure Foreign Tax Credits are claimed correctly and no income falls through the gaps.
• Exit planning: If you are leaving Spain, we advise on whether the Spanish exit tax (Impuesto de Salida) applies to your unrealised capital gains and how to structure your departure efficiently.