The reporting obligation applies to individuals and legal entities resident in Spain, permanent establishments in the country belonging to nonresident persons or entities, and certain other entities covered by Spain’s General Tax Law.
People who are beneficiaries, authorized persons or otherwise have disposal rights over qualifying crypto holdings can fall within the reporting rules as well. Beneficial owners are covered under the framework when the other requirements are met.
Spain’s Tax Agency draws a distinction between custodial and noncustodial wallets based on whether control over the crypto assets or the keys remains with a third party or with the user.
Whether a wallet is connected to the internet is not the deciding factor. Hot wallets and cold wallets can have different technical setups, but the Form 721 treatment turns on control of the private keys.
A taxpayer who keeps control of those keys is not using a third party to safeguard them for the purposes of the reporting requirement. Crypto held under that arrangement is therefore not counted toward the balances covered by Form 721.
The guidance means a hardware wallet can fall outside the Form 721 requirement when the taxpayer controls its private keys. A hot wallet can receive the same treatment if it remains self custodial.
Spain had already introduced the overseas crypto reporting framework in 2023, with the first filing period running in 2024. As crypto.news previously reported, Form 721 was created for reporting qualifying virtual currency holdings on foreign platforms, with a €50,000 threshold applying to the reporting obligation.
Foreign crypto custody can trigger the declaration
Two conditions determine whether crypto can enter the scope of Form 721.
First, the virtual currencies must be held by a person or entity that provides services to safeguard private cryptographic keys for third parties or to maintain, store and transfer virtual currencies.
The custodian must then be outside Spain or be a foreign resident entity without the relevant permanent establishment in Spanish territory.
Only after the first custody requirement is satisfied does the location of the service provider become relevant. A crypto balance does not enter the Form 721 calculation simply because a blockchain network operates internationally or because a wallet can be accessed outside Spain.
The distinction was reinforced in DGT consultation V0848 26, which concerned a Spanish resident who created a US limited liability company in 2025 to hold crypto assets for the long term.
The taxpayer was the sole member of the LLC and had transferred cryptocurrency from a personal wallet to the company. The DGT considered how the foreign company interest and the cryptocurrency should be treated under Spain’s overseas asset reporting rules.
For the crypto portion, the authority examined two possible custody arrangements.
If the assets were held through self custody and the taxpayer stored the private keys, including through a physical hardware device, the DGT said the holdings would not be subject to the foreign virtual currency reporting requirement. The same treatment applied regardless of whether the setup involved a hot or cold wallet.
If a foreign third party instead safeguarded the private keys on the taxpayer’s behalf, the assets could fall within Form 721 when the remaining conditions for reporting were satisfied.
Control of private keys determines the Form 721 treatment
Spanish authorities have drawn the custody definition partly from the European Union’s Markets in Crypto Assets framework.
MiCA defines custody and administration of crypto assets on behalf of clients as safekeeping or controlling crypto assets, or the means of access to them, on behalf of customers. Private cryptographic keys can serve as those means of access.
The distinction separates users who retain their own keys from customers whose assets or access credentials are controlled by a service provider.
Regulated crypto custody has meanwhile become a larger part of Spain’s financial sector. In June, Spanish banking group Cecabank launched a regulated custody platform after securing authorization for crypto custody, transfers and reception and transmission of orders under MiCA. Renta 4 Banco was among the first institutions using the infrastructure.
Cecabank provides the custody and banking infrastructure, while Bit2Me handles areas including trade execution, liquidity and market access. The bank had secured authorization from Spain’s securities regulator, the CNMV, and was registered with the Bank of Spain as a crypto asset service provider.
Custody has since featured in other Spanish crypto services. Bit2Me’s Bit2Shield forensic unit, launched in September, uses multisignature cold wallets to store digital assets seized in investigations until authorities order their disposal.
Self custody can still generate other reporting records
Exclusion from Form 721 does not mean activity involving a self custody wallet is outside every crypto reporting framework.
The European Union’s DAC8 tax reporting regime took effect from Jan. 1, 2026 and requires reporting crypto asset service providers to collect information on reportable users and transactions.
Under the EU’s DAC8 crypto tax rules, service providers can collect transaction information when assets are moved between regulated platforms and external addresses, including self custody wallets. The reporting obligation in that situation falls on the provider covered by the framework and is separate from Spain’s Form 721 test for overseas virtual currency holdings.
Form 721 itself looks at qualifying balances held abroad through third party custodians. Spain’s Tax Agency states that virtual currencies controlled through the taxpayer’s own private keys are not included when calculating the balances covered by the overseas crypto declaration.
The filing obligation can extend beyond people who still hold qualifying assets on Dec. 31. Taxpayers who were owners, beneficiaries or authorized persons, or otherwise held disposal rights during the year but lost that status before year end, may still have to provide information corresponding to the date on which their status ended.
Dormant estates can be required to report when they fall within the entities covered by Article 35.4 of Spain’s General Tax Law, while heirs and legatees become subject to the relevant reporting requirement once an inheritance has been accepted expressly or tacitly.
