If you keep cryptocurrencies on an exchange or platform outside Spain, there is something important you should know: Hacienda (the Spanish Tax Agency) not only wants to know what you earn when you sell, it also wants to know where you keep your assets.
For that purpose, Model 721 exists, an informational declaration designed specifically to register cryptocurrencies located abroad. It is not a tax where you have to pay money directly, but ignoring it can cost you dearly.
Below, we explain clearly, directly, and without beating around the bush who is obliged to file it, from what amount it affects you, and what happens with the funds you have in self-custody.
What Is Model 721
To understand this procedure, the first thing is to distinguish between informing and paying: Model 721 “Informational Declaration on Virtual Currencies Located Abroad” is an informational declaration, not a tax. Filing it does not require you to pay a single euro; its only function is to give Hacienda a “snapshot” of your crypto-assets abroad to cross-check data with your personal income tax (IRPF) or Wealth Tax.
Born under Order HFP/886/2023 as an evolution of Model 720, this obligation requires you to electronically report the balances you hold as of December 31 on international exchanges (such as Binance or Kraken) or on foreign DeFi platforms.
In short: you report what you have, not what you earn. That said, even though it does not require payment, don’t get complacent: ignoring this notification carries some of the harshest penalties in the Spanish tax system.
Who Is Obliged to File It
Holding cryptocurrencies does not automatically imply filing this procedure. The obligation is only activated if you are a tax resident in Spain and meet two conditions: that your assets are custodied by a third party abroad and that they exceed a certain economic volume.
The Amount That Triggers the Obligation: €50,000 as of December 31
The determining factor is reaching a combined value exceeding €50,000 as of December 31 on foreign exchanges.
- The year-end balance counts: The fixed snapshot as of December 31 is evaluated. If during the year you accumulated €100,000 but on that date your balance dropped to €49,999 (due to market drops or sales), you are not obliged to declare.
- Global computation: The limit applies to the sum of all your foreign wallets. Having €30,000 on Binance and €25,000 on Kraken adds up to €55,000, activating the obligation.
- Obligated parties: It affects individuals and legal entities resident in Spain who are direct owners, real owners, beneficiaries, authorized persons, or have power of disposal (according to art. 42 quater of the RGAT). It also covers those who lost their status as owner during the year (declaring the figure as of the date of termination).
- The +€20,000 rule: If you already filed it in a previous year, the obligation only reappears if your global balance increases by more than €20,000 compared to the last declaration, or if you canceled the ownership of any previous asset.
Crypto Custodied by Entities Outside Spain
The key to determining whether a cryptocurrency falls under Model 721 is not your physical location, but who safeguards the private keys.
Assets whose keys are in the hands of persons or entities not resident in Spain and without a permanent establishment in the country must be declared. This group includes international exchanges and custodians (Binance, Kraken, Coinbase, KuCoin), as they are not constituted or registered as national providers with a local tax address.
What Happens with Crypto in Self-Custody
The Tax Agency (AEAT) officially clarified in its FAQs that cryptocurrencies in self-custody are excluded from Model 721. This stance ratifies the criterion set by the General Directorate of Taxes (binding consultations V2290-23 and V0941-24).
By directly controlling the private keys, there is no third party intermediating the custody from abroad:
- Cold wallets: Physical devices such as Ledger, Trezor, or BitBox are not declared.
- Hot wallets without custody: Applications such as MetaMask, Trust Wallet, or Exodus are not declared, as long as the user is the sole holder of the keys.
Do You Have to File Model 721?
|
Scenario |
Obliged to file Model 721? |
| You have less than €50,000 on a foreign exchange | NO |
| You have more than €50,000 stored on a Ledger / Trezor (self-custody) | NO |
| You have more than €50,000 spread across registered Spanish exchanges | NO |
| You have €50,000 or more accumulated on foreign exchanges (e.g., Binance, Coinbase) | YES |
Filing Deadline
Once you have verified that you meet the requirements to declare, you must pay attention to the tax calendar.
The period enabled by the AEAT Electronic Headquarters to file the declaration is from January 1 to March 31 of the year following the fiscal year being reported.
For example, the campaign corresponding to fiscal year 2026 must be filed between January 1 and March 31, 2027.
- Filing channel: The procedure is carried out exclusively electronically via the Internet (with a Digital Certificate or electronic ID).
- 4-day technical extension: If, due to computer problems or technical failures on the Tax Agency’s platform, you were unable to complete the submission within the legal deadline, the regulations allow filing during the four calendar days following the deadline.
What Information Model 721 Asks For When Filling It Out
When formalizing the declaration at the AEAT Electronic Headquarters, the platform requests a series of specific data to exhaustively identify each of your positions abroad (in accordance with the annex of Order HFP/886/2023).
- Custodian entity data: Full name or corporate name of the entity; Tax Identification Number (NIF) assigned in its country of tax residence (if it has one); and tax address or official web address of the provider.
- Identification of the crypto-assets: Asset name and its ticker (e.g., Bitcoin – BTC, Ethereum – ETH).
- Balances and economic valuation at year-end: Exact number of units of each cryptocurrency at that date and their valuation in euros as of December 31 (taking as reference the official market quotation on the main platforms).
What Happens If You Canceled Your Account Before December 31?
If you lost your status as owner, authorized person, or beneficiary during the year (for example, after closing the account or transferring all the funds), you still have to report it. In these cases, the financial information you must provide does not correspond to December 31, but to the exact date on which that relationship or ownership was extinguished.
How It Differs from Model 720 and the Income Tax Return
To avoid common confusions between the different tax obligations, it is essential to distinguish Model 721 from other procedures it is often mixed up with:
|
Procedure |
What is declared? |
Purpose |
| Model 720 | Accounts, real estate, or shares abroad | Informational |
| Model 721 | Cryptocurrencies custodied on foreign exchanges | Informational |
| Income Tax (IRPF) | Gains or losses when selling, exchanging, or earning yield on cryptos | Pay taxes |
What Happens If You Don’t File It
Ignoring Model 721 or submitting it late is penalized under the general regime of the General Tax Law (LGT):
- Late filing (voluntary): If you declare before Hacienda requires you to, the fine is €10 per data point, with a minimum of €150.
- Not filing after an AEAT requirement: If the tax authority requires the declaration from you, the penalty rises to €20 per omitted data point, with a minimum of €300 and a maximum of €20,000.
- Incorrect or incomplete data: A fixed fine of €150 applies.
However, the main danger is not only the administrative fine, but the subsequent inspection. If the AEAT discovers that you had unreported funds abroad and you do not prove their origin, it will consider them an unjustified capital gain. In that case, the Income Tax (IRPF) assessment can indeed carry proportional penalties of between 50% and 150% of the defrauded amount , plus late-payment interest.
Frequently Asked Questions About Model 721
- Do I have to file 721 if I use a Spanish exchange? It only applies to foreign platforms. Spanish entities report directly to the AEAT.
- Does the balance of all my wallets count? Only foreign platforms count if you exceed €50,000. Self-custody is not declared.
- Does 721 mean I have to pay taxes? It is 100% informational. It does not generate any payment or tax settlement.
- Is it filed every year? After the first time, it is only repeated if your balance rises by more than €20,000 or if you sell/cancel any reported position.
In short, Model 721 is a simple procedure, but mandatory if you keep more than €50,000 on foreign exchanges. Filing it on time is the most direct way to keep your cryptocurrencies in order with the AEAT and avoid unnecessary fines for oversights or lack of information.
If you have a complex case or doubts about your portfolio, consult a tax advisor specialized in crypto-assets. Don’t risk penalties for errors in your declarations: the peace of mind of having everything in order is priceless.