Form 721 (Modelo 721): Crypto Held Abroad in Spain
We help you prepare and file Form 721 (the information return on virtual currencies held abroad) with sound tax judgment and a practical approach.
- Combined balance threshold
- €50,000
- Increase that triggers a new filing
- €20,000
- End of filing period
- March 31
- Balance date
- December 31
What is Form 721?
Who in Spain is required to file Form 721?
What information must Form 721 for crypto in Spain include?
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Why is it important to file Form 721?
Because the Spanish Tax Agency (AEAT / Hacienda) cross-checks information, and Form 721 for crypto is a formal obligation that, if ignored or done badly, often ends in requests for information, corrections and avoidable costs. An organized approach (balances, custody, valuation and evidence) saves you trouble.
Information requests and tax audits
Incomplete or inconsistent filings trigger requests for information: statements, proof of balances, identification of providers and a documentary audit trail.
Penalties, surcharges and corrections
Failing to meet information-reporting obligations can have financial consequences and forces you to redo documentation and calculations (valuation at December 31, currencies declared, removals due to loss of status).
Operational and banking risk
When it comes together with withdrawals to a bank, source-of-funds questions or significant transactions, poor documentation can complicate compliance reviews and make it harder to prove where the funds came from to third parties.
Ready to prepare your Form 721?
We organize the file, review custody and thresholds, and prepare the filing with a defensive approach. You focus on your business; we take care of the crypto tax side.
Form 721 for crypto, explained
What exactly do you report on Form 721?
Form 721 reports virtual currencies held in custody by providers not resident in Spain. For each type of currency you report the units held at December 31 and their value in euros, along with the custodian’s details.
The practical key is to separate what is held in third-party custody (exchange/custodial wallet) from what is in a non-custodial wallet where you control the private key.
When is a cryptocurrency considered to be held abroad?
It is considered held abroad when the provider that holds the currency (or the keys) in custody is not resident in Spain and does not operate through a permanent establishment in Spanish territory.
To identify providers, it usually helps to check the exchange’s country, its legal entity and official registers, where they exist. If in doubt, the case is analyzed individually.
Are cold or non-custodial wallets included?
If you keep control of the private keys (non-custodial wallet), they are normally not counted for this information-reporting obligation. The obligation focuses on currencies held by third parties that provide safekeeping/transfer services.
The tricky part is hybrid services (partial custody, shared accounts, sub-accounts or layered custodians). In those cases it is advisable to document the custody model.
Threshold: €50,000 and when you must file again
The first time, the test that usually applies to trigger the obligation is a combined balance above €50,000 at December 31 (valued in euros).
In subsequent years, filing is usually mandatory if the combined balance shows an increase of more than €20,000 over the balance that determined the last return, and also when there is a loss of status over previously declared currencies (for example, sale/closure/change).
Filing deadline and method
Form 721 is filed between January 1 and March 31 of the year following the year to which the information relates.
It can be filed using the web form on the AEAT e-Office (Sede electrónica) or by electronic submission in the technical file format (for integrations). Either way, the quality of the data and evidence is what makes the difference.
Common mistakes in Form 721 for crypto
- Confusing custody on an exchange with your own wallet and miscalculating the threshold.
- Valuing in euros with an inconsistent source (or without keeping a record of the source used).
- Counting currencies twice across platforms or mixing sub-accounts in a disorganized way.
- Not correctly reporting the loss of status when applicable.
- Not keeping statements, screenshots and evidence that support the balances.
Difference between Form 721 and other forms
Form 721 is an information return and focuses on holdings/custody abroad. It does not replace declaring gains/losses or income when there are taxable events (sales, swaps, staking, etc.).
In addition, holding fiat on an exchange or bank balances abroad can trigger other, separate obligations. That is why it pays to look at the full picture.
How we handle your case
We start by mapping: (1) where the custody is, (2) whether the threshold/change applies, (3) which currencies and balances at December 31, (4) valuation and source, (5) evidence. Then we prepare the filing and a supporting dossier in case there is a request for information.
Form 721 for crypto in Spain
If you want clarity in 60 seconds: what is included, what is not, and what you need to have ready.
Included in Form 721
Cryptocurrencies held in custody by a third party (exchange/custodial wallet) not resident in Spain, with balances at December 31 and valuation in euros.
Not included (normally)
Non-custodial wallets where you control the private key. What matters is documenting the type of custody properly if your case is hybrid.
What you will be asked for
Statements, screenshots and balance reports; identification of the custodian; the valuation source at December 31; and consistency with your tax position (if there were sales).
Checklist to prepare your Form 721 for crypto
Use it as a checklist before you file.
- Identify custodians (exchanges/custodial wallets) and where they are resident (Spain vs. abroad).
- Calculate the combined balance at December 31 and check the thresholds (€50,000 the first time; increases and removals when applicable).
- Break it down by currency: name and ticker (BTC, ETH, USDT…) and units.
- Value in euros at December 31 and keep a record of the source (platform/price site used).
- Keep evidence: exchange reports, screenshots, CSVs, closure/change emails and proof of custody.
- Check consistency (if there were sales/swaps, make sure your tax history does not contradict the balances declared).
Common cases
I have crypto on a foreign exchange and in my own wallet
What the foreign exchange holds in custody is usually counted. What is in your own (non-custodial) wallet is normally not included, but it is advisable to document the custody and keep evidence.
I filed once and this year I am not above €50,000
In subsequent years, the obligation usually depends on the increase compared with the last return and on whether you lose your status over previously declared currencies (sales/closures). It is assessed against your balances and transactions.
I switched exchanges during the year
You need to reconstruct the balances at December 31 and the custodian entity at that date, and keep a documentary audit trail (CSV exports, tickets, emails). What matters is that the final figure is consistent and defensible.