Form 720: The Overseas Assets Declaration Every Expat in Spain Should Know About

If you’ve moved to Spain and are already a tax resident here, you’ve probably heard about Form 720 spoken of with a certain dread. It’s an informative declaration — it doesn’t involve paying any tax in itself — through which the Spanish tax authority (the Agencia Estatal de Administración Tributaria, or AEAT, the body that manages taxes in Spain) requires tax residents to report the assets and rights they hold outside Spain. The obligation doesn’t depend on your nationality or passport, but on your tax residency: as soon as you start being taxed in Spain on your worldwide income, your accounts, investments or property back home (or anywhere else) potentially come onto this form’s radar.

What must be declared, and when the obligation kicks in

Form 720 organizes overseas assets into three separate categories, and each one must be valued independently:

1. Accounts held with financial institutions outside Spain (current accounts, savings accounts, deposits).
2. Securities, shares, investment fund units, life insurance policies and income streams managed or held abroad.
3. Real estate and rights over real estate located outside Spain.

The key rule is the €50,000 threshold per category. If the combined value of the assets in a given category doesn’t exceed that amount as of December 31, there’s no obligation to declare that category (though it’s worth keeping track anyway, since the threshold is calculated by adding up all assets of the same type, not account by account). Once the form has been filed for a category, it doesn’t need to be repeated every year: you’ll only need to file again for that category when its combined value has increased by more than €20,000 since the last declaration, or when an already-declared asset is disposed of or ownership ends.

One important nuance for digital nomads and newcomers: the bank account you used back home before moving to Spain doesn’t disappear from the tax radar just because you’ve stopped actively using it. What matters is its balance at year-end, not how active it is.

Penalties, after the EU Court of Justice ruling

For years, Form 720 had a reputation as a trap: the original penalty regime set very high fixed fines for each piece of information omitted or inaccurate, and it also allowed the tax authority to treat the value of an undeclared asset as an unjustified capital gain, attributable to the earliest non-time-barred tax year — without the usual four-year statute of limitations applying. In practice, a simple administrative oversight could trigger a regularization wildly disproportionate to the asset actually involved.

The Court of Justice of the European Union (CJEU) ruled this regime contrary to EU law, finding that it unjustifiably restricted the free movement of capital within the EU. As a result, Spain was forced to reform the system: the disproportionate specific penalties and the non-time-barred treatment of the unjustified capital gain were removed, leaving non-compliance with Form 720 subject to the general penalty regime of Spain’s General Tax Law, which is far more proportionate to the actual harm caused to the Treasury. This doesn’t mean filing late or incorrectly is now penalty-free — there are still sanctions — but the risk is no longer what once led so many advisors to recommend declaring, almost out of extreme caution, every last euro even after the deadline.

The deadline: January 1 to March 31

Form 720 is filed between January 1 and March 31 of the year following the one the information relates to, and only electronically with the AEAT. It’s a date worth marking on the calendar as soon as the year begins, since it falls in a period when many expats are still getting their first Spanish income tax return in order, and it’s easy to overlook that these are two separate obligations.

At Zythos Business, we regularly help self-employed professionals, small businesses and individuals with assets outside Spain determine whether they’re actually required to file Form 720, which category each asset falls into, and how to avoid both missing the deadline and over-declaring unnecessarily. If you settled in Spain this year and aren’t sure whether your foreign accounts or investments need to appear on this declaration, now is a good time to check — before March comes around.