Spain Clarifies Self-Custody Crypto Is Outside Form 721 Reporting

What Form 721 covers

Form 721 is Spain’s overseas crypto reporting form for qualifying virtual currency holdings located abroad. It applies to individuals and legal entities resident in Spain, permanent establishments in Spain of nonresidents, and certain other entities covered by the country’s General Tax Law.

The framework was introduced in 2023, with the first filing period in 2024. As previously reported, the obligation is triggered at a threshold of €50,000 for qualifying holdings on foreign platforms. Beneficiaries, authorized persons, people with disposal rights and beneficial owners can also fall within the rules when the other conditions are met.

Private keys determine the outcome

Spain’s Tax Agency draws the line between custodial and noncustodial arrangements based on who controls and safeguards the private cryptographic keys. If the taxpayer keeps control of those keys, the arrangement is not treated as third-party custody for Form 721 purposes.

That means both hot wallets and cold wallets can be excluded from Form 721 if they are genuinely self-custodial. A hardware wallet is not automatically reportable simply because it stores crypto, and a hot wallet is not automatically included because it is connected to the internet. In both cases, the deciding factor is whether a service provider holds the keys or otherwise controls access to the assets.

When foreign custody can trigger reporting

The reporting obligation can arise when two conditions are met. First, the crypto must be held by a person or entity that safeguards private keys for third parties or otherwise maintains, stores and transfers virtual currencies. Second, that custodian must be located outside Spain, or be a foreign resident entity without the relevant permanent establishment in Spain.

The authorities stressed that a crypto balance does not enter the Form 721 calculation merely because blockchain networks operate internationally or because a wallet can be accessed from abroad. The foreign location of the service provider matters only if there is a custody service in the first place.

This distinction was reinforced in consultation V0848-26, which examined a Spanish resident who set up a US LLC in 2025 to hold crypto for the long term. According to the consultation, crypto held in self-custody by the taxpayer, including through a physical hardware device, would not be subject to the foreign virtual currency reporting requirement. If a foreign third party held the private keys instead, the assets could fall within Form 721 if the remaining reporting conditions were satisfied.

Broader reporting still applies in some cases

The clarification does not mean self-custody activity sits outside every tax reporting regime. The EU’s DAC8 rules took effect on Jan. 1, 2026 and require reporting crypto asset service providers to collect information on reportable users and transactions.

Under DAC8, providers can generate records when crypto is transferred between regulated platforms and external addresses, including self-custody wallets. That obligation falls on the service provider covered by the regime and is separate from Spain’s Form 721 test, which focuses on qualifying balances held abroad through third-party custodians.

Who may still need to file

Spain’s guidance also indicates that the filing obligation is not limited to taxpayers who still hold qualifying assets on Dec. 31. People who were owners, beneficiaries, authorized persons or otherwise had disposal rights during the year but lost that status before year-end may still need to report the information corresponding to the date that status ended.

Dormant estates can also be covered when they fall within the entities described in Article 35.4 of Spain’s General Tax Law. Heirs and legatees become subject to the relevant reporting requirement once an inheritance has been accepted, whether expressly or tacitly. The next confirmed step for taxpayers remains the same: determine whether the assets are truly self-custodied or instead held through a foreign custodian before assessing any Form 721 obligation.