File Modelo 720 (foreign-assets declaration) if any category of overseas assets exceeds €50,000 — filed 1 Jan–31 Mar; reformed flat-rate penalties apply since the 2022 EU court ruling struck down the old proportional regime

Spain's foreign-asset declaration: once you're tax resident, overseas holdings above the title's per-category threshold must be reported in the title's first-quarter window. It's informative — no tax is due on the declaration itself — but it carries penalties for not filing, and its history (the EU court ruling the title mentions) is exactly why it should be taken seriously rather than feared. A gestor files it in an afternoon.