Modelo 721 Explained: Declaring Foreign Crypto Holdings in Spain

Modelo 721 is a Spanish tax form — the "Declaración informativa sobre monedas virtuales situadas en el extranjero", the information return on virtual currencies held abroad. It is filed with Spain's Agencia Tributaria. This guide explains what it is, who must file it, the threshold, and the deadline. It is educational and is not tax advice; its purpose is to help you understand and meet the obligation correctly, not to describe ways to avoid declaring. Every figure is dated and attributed — this is a snapshot as of 16 July 2026, based on the Agencia Tributaria's Modelo 721 FAQ (last updated 8 July 2026). Always confirm the current rules with the Agencia Tributaria or a qualified professional.

What Modelo 721 is — and is not

Modelo 721 is informational. It reports the existence and value of virtual currencies you hold abroad; it does not itself charge tax on those holdings. It is separate from the income tax (IRPF) you may owe on gains when you sell or exchange crypto — a topic covered in the Spain crypto tax guide. Think of Modelo 721 as a disclosure of what you hold abroad, filed once a year, running alongside — not instead of — your ordinary tax return.

Who must file

According to the Agencia Tributaria, the obligation falls on persons and entities resident in Spain (and permanent establishments in Spain of non-residents) who, as of 31 December, are titulares (owners), beneficiarios (beneficiaries), autorizados (authorised persons), or otherwise hold power of disposal over virtual currencies located abroad.

The €50,000 threshold

There is no obligation to file if the combined 31 December balances of all your types of virtual currency held abroad, valued in euros, do not jointly exceed €50,000. If that combined figure is exceeded, you must report all of the virtual currencies. The test is on the aggregate value across currency types, taken at the year-end date.

What counts as held "abroad"

This is the point most often misunderstood, and the Agencia Tributaria is specific: virtual currencies count as held abroad — and therefore reportable on Modelo 721 — only when both conditions are met:

• the virtual currencies are custodied by a person or entity that provides services to safeguard private cryptographic keys on behalf of third parties; and
• that custodian is not resident in Spain (and is not a permanent establishment in Spanish territory).

Two important consequences follow directly from the FAQ:

• Self-custody is excluded. Crypto held in wallets where you control the private keys is not reported on Modelo 721 — the FAQ states that coins held in wallets over which the holder keeps control are not to be reported here.
• Spanish-resident platforms are outside its scope. Holdings on a custodian that is resident in Spain are not "abroad" for Modelo 721 purposes (they may fall under other Spanish reporting, such as Modelo 172/173 filed by the provider).

Valuation and the deadline

Balances are valued in euros as of 31 December of the reference year. Modelo 721 is filed the following year, in a fixed window: from 1 January to 31 March. For the 2025 reference year, that means the filing window 1 January to 31 March 2026. The return is submitted electronically through the Agencia Tributaria's Sede Electrónica.

After the first year

Once you have filed, you generally only need to file again in a later year when your position changes in a way the rules require you to report again — for example a material increase in value, or ceasing to hold. The exact re-filing thresholds are set out in the Modelo 721 instructions; check the current version on the Agencia Tributaria site rather than assuming, as these details can change.

Keeping records

Because Modelo 721 turns on year-end values and on who custodies your keys, keep clear records: which platforms hold your crypto and where those platforms are resident, and the euro value of each holding at 31 December. Most platforms let you export balances and history; if you trade perpetual futures on WEEX, you can export your transaction history for your records. Complete records help you file correctly — that is the goal here, not reducing any obligation.

Key takeaways

• Modelo 721 is an information return for virtual currencies held abroad — it discloses, it does not itself tax.
• You must file if the combined 31 December value of virtual currencies held abroad exceeds €50,000.
• "Abroad" means a non-Spain-resident custodian holds your keys; self-custody and Spanish-resident platforms are outside its scope.
• The filing window is 1 January to 31 March of the following year (1 Jan–31 Mar 2026 for 2025). Snapshot as of 16 July 2026 — verify with the Agencia Tributaria.

Record of revisions

• 16 July 2026: Initial version. Threshold, scope, self-custody exclusion and deadline verified against the Agencia Tributaria Modelo 721 FAQ (last updated 8 July 2026). This page joins the monthly refresh cycle; each review updates this log and the "as of" date.

This article is for informational and educational purposes only and does not constitute tax, legal, financial or investment advice. It does not describe any means of avoiding a filing or reporting obligation. Tax rules change and the position described is a snapshot as of 16 July 2026. For your specific situation and the current rules, consult the Agencia Tributaria (sede.agenciatributaria.gob.es) or a qualified tax professional. Cryptocurrency trading — especially futures trading with leverage — carries a high level of risk.