Modelo 721 (Spanish Crypto Reporting Form)

Definition

Modelo 721 is the informational declaration that Spain's tax authority (Hacienda) requires for cryptoassets held abroad. It applies to Spanish tax residents — a key point for expats and international investors with ties to Spain. It is not a tax: nothing is paid upon filing; you only report what you hold. Its function is transparency, just as Modelo 720 is for foreign bank accounts, securities, and real estate. The difference is the scope: the 720 covers traditional assets outside Spain, while the 721 specifically covers cryptoassets.

Who must file. Anyone who, as of December 31, holds a combined crypto balance above €50,000 with service providers located outside Spain (foreign exchanges or custodians). The threshold applies to the aggregate, not per coin — and it is unwise to game it at €49,999. The filing window runs from January 1 to March 31 of the following year, and failure to file, or filing incorrectly, carries penalties.

The self-custody nuance. The 721 targets balances held with foreign service providers. Self-custodied holdings — private keys in your own possession, with no third party — are treated differently, and Spain-based providers file separate informational forms themselves. Since blockchain traceability never expires and information exchange between tax administrations (DAC8, CARF) keeps closing the data loop, compliance is the sound approach. This is not tax advice: confirm your situation with a professional.

In Context