Requirements and obligations to file the “Modelo 720” tax form in Spain

The Spanish Modelo 720 — the foreign asset declaration form — remains one of Spain’s most controversial tax measures. Introduced as part of an anti-avoidance regime, it obliges Spanish tax residents to report assets held abroad. Non-compliance can lead to disproportionately high fines, which the European Commission has challenged before the EU Court of Justice as contrary to EU law.

Who must file the form?

Spanish tax residents — those who spend more than 183 days in Spain, derive their main income there, or have family or economic interests based in Spain — must submit the Modelo 720 when the total value of their overseas assets exceeds €50,000. This includes:

Real estate and property income
Bank accounts, deposits and cash
Financial assets, investments, insurance and pensions

The form must be filed online by 31 March each year, though it need not be repeated annually unless asset values increase by more than €20,000.

Compliance and penalties

Penalties for failure to file can reach 150% of undeclared asset values, a sanction widely criticised for breaching the presumption of innocence. In practice, taxpayers are often better off filing late and regularising their position than risking inspection and litigation.

Given the Spanish tax authority’s strict enforcement and complex rules, obtaining specialist legal advice is essential before submitting a late or corrective declaration. Proper preparation — reviewing assets and documentation from the past four years — can help avoid costly and prolonged proceedings.