Spain's Crypto Reporting Rule: Key Control Matters More Than Portfolio Size

Spain's Modelo 721 rule for reporting cryptocurrency assets is more complex than it seems. The key factor in determining whether an asset falls under this rule is not its value, but rather who controls the private keys. If a taxpayer has control over their crypto holdings, those assets are considered self-custodied and do not need to be reported under Modelo 721.

However, if a foreign custodian holds the private keys on behalf of a Spanish taxpayer, that asset is considered situated abroad and may trigger reporting requirements. The €50,000 threshold applies only after an asset has been deemed subject to foreign custody rules.

A recent binding ruling from Spain's Directorate-General for Taxation (V5066-26) clarified the distinction between self-custodied and foreign-custodied assets. It also addressed the issue of crypto sold within a single tax year, determining that such sales do not create a Modelo 721 filing requirement if no previous reporting obligation existed.

Taxpayers should note that their prior reporting history can change the result in some cases. If an asset was previously reported under Modelo 721 and its value increases by more than €20,000, another filing may be required.