Spain's Directorate-General for Taxation and the Spanish Tax Agency have clarified that Modelo 721, the informative declaration for virtual currencies situated abroad, applies only to crypto held by foreign third-party custodians that manage private keys on behalf of taxpayers. Under Article 42 quater of Royal Decree 1065/2007, genuine self-custody is excluded from the reporting framework because there is no third-party custodian safeguarding the keys.
The €50,000 threshold therefore applies only to the aggregate balance of qualifying foreign-custodied crypto, not to a taxpayer's total portfolio. The Spanish Tax Agency also stressed that the difference between hot and cold wallets is not decisive: a hardware wallet may be self-custodial, but the legal classification depends on control of the private keys.
The clarification follows binding ruling V5066-26, issued on June 24, 2026, which concluded that crypto acquired and fully sold within the same tax year did not create a Modelo 721 filing obligation in the circumstances described, provided no previous reporting duty existed. Another binding ruling, V0848-26 of April 21, 2026, examined Modelo 721 in the context of crypto assets and an overseas LLC.
For Spanish taxpayers, the filing analysis should begin with custody, not valuation. After a first declaration, a further filing is generally required when the relevant combined balance increases by more than €20,000, and separate rules apply when reportable ownership or control ends. The filing window runs from January 1 to March 31 of the following year. Modelo 721 is only an information return and does not determine whether crypto gains are taxable under Spanish law.
