Inherited Cryptocurrency in Spain: How to Value It and What Tax You Owe

As cryptocurrency becomes a mainstream asset class, it is increasingly appearing in Spanish estates. Whether you have inherited Bitcoin, Ethereum, or other digital assets from a family member who was a Spanish tax resident, you face specific obligations: an inheritance tax charge, a valuation question, and reporting duties that differ from other financial assets. This guide sets out the current position under Spanish law.

Is Inherited Cryptocurrency Subject to Spanish ISD?

Yes. Cryptocurrency is treated as a financial asset under Spanish law — specifically, the AEAT classifies virtual currencies as bienes y derechos de contenido económico (assets and rights of economic content). When a Spanish tax resident dies holding cryptocurrency, those assets form part of the taxable estate for Impuesto sobre Sucesiones y Donaciones (ISD) purposes.

For Modelo 720 categorisation, cryptocurrency held at exchanges is treated as a financial account (Category 2 — accounts at financial institutions), while crypto held in self-custody wallets is classified as other assets.

How Is Crypto Valued for Inheritance Tax?

The taxable base for ISD on inherited cryptocurrency is the market value at the date of death. The AEAT uses the exchange market price — specifically, the value quoted on the principal exchange where the asset was held or traded — at the date of death. There is no provision for averaging over a period; the date-of-death spot price is used.

Practical evidence required to support the valuation typically includes:

• Exchange account statements showing the portfolio at the date of death
• Screenshots or export of prices from the exchange at the relevant date
• For self-custody wallets: blockchain explorer records confirming the balance, together with market price data from a recognised price feed (CoinMarketCap, CoinGecko, or the exchange price)
• Third-party valuation reports for illiquid or unlisted tokens

The Step-Up in Cost Basis for the Heir

One significant benefit of inheriting cryptocurrency — shared with other asset classes — is the step-up in cost basis. The heir's cost basis for future capital gains purposes is the value at which the asset was included in the inheritance declaration (i.e., the date-of-death market value, which forms the ISD taxable base).

This means: if the deceased acquired 1 Bitcoin for €5,000 and it was worth €80,000 at date of death, the heir's cost basis is €80,000 — not €5,000. The entire accrued gain during the deceased's lifetime is wiped out for CGT purposes (it is instead subject to ISD). If the heir sells the Bitcoin immediately at €80,000, no capital gains tax is due (the gain is zero: sale price €80,000 minus cost basis €80,000).

Worked Example

Modelo 720 Reporting by the Heir

Once the heir accepts the inheritance and holds cryptocurrency with a market value exceeding €50,000 (considering all foreign financial accounts and assets together), they must assess their Modelo 720 obligations. Key points:

• Cryptocurrency held at foreign exchanges qualifies as a foreign financial account reportable on Modelo 720
• The first Modelo 720 declaration must be filed if the threshold is exceeded, within the filing window (January 1 to March 31 of the following year)
• Self-custody wallets require separate consideration — the AEAT has been developing guidance on the categorisation of self-custodied crypto
• In addition, from 2024, Spain requires annual reporting of cryptocurrency balances on Modelo 721 (a new dedicated crypto reporting form)

Exchange Data and AEAT Access

Major cryptocurrency exchanges increasingly share data with tax authorities. Under DAC8 (the EU's eighth Directive on Administrative Cooperation), EU exchanges are required to report crypto balances and transactions to tax authorities from 2026 onwards. Spanish exchanges (and EU exchanges serving Spanish residents) are subject to reporting requirements under Law 11/2021. This means the AEAT has growing visibility into cryptocurrency holdings — both for living taxpayers and, through estate processes, for deceased persons' holdings.

When the Exchange Has Failed: Insolvency and the Estate's Claim

Exchange insolvency is no longer a theoretical risk. The collapses of FTX, Celsius, Voyager, and a string of smaller platforms have left thousands of Spanish residents — and their heirs — holding not cryptocurrency, but an unsecured claim in insolvency proceedings. For estate purposes, this distinction matters enormously.

What the Estate Actually Holds

When a cryptocurrency exchange enters insolvency before the account holder dies — or enters insolvency during the estate administration period — the estate does not hold cryptocurrency. It holds a derecho de crédito (creditor's claim) against the insolvent estate. This is a fundamentally different asset from the underlying cryptocurrency. A claim in insolvency proceedings is illiquid, subject to lengthy delays, and may ultimately return cents on the euro.

The distinction has several cascading implications for ISD purposes:

• Asset classification: The claim is a financial receivable, not a virtual currency. It falls outside the standard cryptocurrency valuation framework and must be valued as a contingent receivable.
• Modelo 720/721 categorisation: A proven claim in insolvency proceedings is unlikely to be a "cryptocurrency balance" for Modelo 721 purposes. Its reporting status under Modelo 720 as a foreign financial claim requires case-by-case analysis.
• Valuation complexity: The AEAT's default position is to tax the estate on the nominal value of the claim (i.e., the face value of the crypto at the date of death). However, if the insolvency is well-documented and recovery prospects are demonstrably poor, heirs can — and should — argue for a heavily discounted or nil valuation.

AEAT Position on Insolvent Exchange Claims

The AEAT has not issued a specific binding ruling (consulta vinculante) addressing the precise situation where an exchange enters insolvency before or during the estate settlement process. However, the general ISD principle — that assets are valued at their "real market value" (valor real) at the date of death — provides the operative framework. A claim against an insolvent counterparty that is trading at a severe discount on the secondary market (as was the case with FTX customer claims, which traded at 30–60 cents on the dollar during 2023) has a demonstrable real market value well below the nominal cryptocurrency value.

The practical approach recommended for heirs is:

• Obtain documentary evidence of the exchange's insolvency status at the date of death (administrator's report, court filing, creditor notice)
• Where claims are traded on secondary markets (as FTX claims were), obtain market price data as of the date of death to support the discounted valuation
• File the ISD declaration with a discounted valuation, supported by a technical valuation opinion
• Be prepared for the AEAT to challenge the discount and to defend the position through the administrative review process (reclamación económico-administrativa)

Timing of ISD: A Critical Problem

The ISD accrues at the date of death. The six-month filing deadline runs from that date (extendable by a further six months on request). If the exchange enters insolvency after the date of death but before the ISD is filed, the valuation question becomes even more acute: the crypto existed and had value at date of death, but by filing time the claim is worth a fraction of its former value. In this scenario, there is a strong argument that the date-of-death valuation should reflect the full market price — but the heir may also argue for a correction in a subsequent rectification of the self-assessment, particularly if the insolvency was foreseeable at death (e.g., the exchange had already suspended withdrawals).

Regional ISD Bonuses by Autonomía: The Critical Variable

One of the most consequential features of the Spanish ISD system — for inherited crypto and all other assets — is that the effective tax rate is determined almost entirely by the autonomous community where the deceased was tax resident, not by the national tariff alone. Most regions have enacted major bonificaciones (tax credits) for direct-line heirs (Group I: descendants under 21; Group II: descendants over 21, spouses, ascendants). The variation is dramatic:

The fiscal domicile of the deceased at death — not the location of the cryptocurrency, the exchange, or the heirs — determines which regional rules apply. For large crypto estates, the difference between Madrid (effective 0%) and Cataluña (up to 34%) on a €1,000,000 portfolio is approximately €340,000 in ISD alone. This regional variable makes fiscal domicile one of the most important planning levers for any high-value estate.

Pre-Death Planning: Gifting Crypto Before Death

Sophisticated estate planning for cryptocurrency does not begin at death. Two primary pre-death strategies are worth understanding: inter vivos gifts of crypto during the owner's lifetime, and the timing decisions that accompany them.

Gift Tax (ISD Donaciones) vs Inheritance Tax

Gifts of cryptocurrency during the donor's lifetime are subject to ISD donaciones — the same tax as inheritance but with different rates and, crucially, different regional bonuses. In many regions, the regional bonus that applies to inheritance (e.g., 99% in Madrid or Andalucía) also applies to inter vivos gifts between direct-line family members. However, there is an important asymmetry: gifts do not produce a step-up in basis for the donor's CGT position — the donor will have realised a capital gain on the gift for IRPF purposes.

The tax mechanics of gifting cryptocurrency in Spain are as follows:

• Donor's IRPF: The transfer of cryptocurrency as a gift is a disposal for CGT purposes. The donor must recognise a gain equal to the market value of the crypto at the date of gift minus their original acquisition cost. This gain is taxed at savings-income rates (19–28%) in the donor's IRPF return for the year of the gift.
• Recipient's ISD donaciones: The recipient pays ISD donaciones on the market value of the gift. In Madrid and Andalucía, the 99% bonificación applies — resulting in near-zero ISD on the gift. In Cataluña, the gift is taxed at the full donaciones tariff, which for direct-line family members is relatively modest but non-trivial.
• Recipient's CGT cost basis: Unlike inheritance, a gift does not give the recipient a stepped-up cost basis equal to the date-of-gift value. The recipient's cost basis is the value declared for ISD donaciones purposes — but the interaction with the donor's CGT position means the overall tax cost requires careful calculation.

Timing Strategies: When Does Gifting Make Sense?

Whether gifting crypto before death is more efficient than allowing it to pass through the estate depends on several variables:

• The donor's original acquisition cost: If the donor acquired Bitcoin at €1,000 and it is now worth €100,000, gifting triggers an immediate €99,000 gain taxed at up to 28% IRPF. Inheritance avoids this CGT entirely (the step-up in basis wipes the gain). In this scenario, inheritance is typically more efficient.
• The regional ISD regime: Where both inheritance and gift bonuses are 99% (Madrid, Andalucía), the ISD cost is minimal either way. The dominant cost on a gift is the donor's CGT — making inheritance preferable where there is a large accrued gain. Where the inheritance bonus is zero (Cataluña) and the gift tariff is lower than the inheritance tariff, gifting may be preferable on balance.
• Market timing: Gifting at a market low crystallises a smaller CGT gain for the donor and a lower ISD base for the recipient — while still passing the asset to the next generation. Holders who accumulated during bear markets and have seen very large gains face the starkest trade-off.
• The donor's remaining life expectancy and the ISD accrual question: ISD on inheritance accrues at death. Gifting now transfers the asset outside the estate and removes it from future ISD risk — but triggers immediate CGT. For donors in good health with substantial accrued gains, maintaining ownership and accepting the inheritance ISD risk (particularly in low-ISD regions) is usually the lower-cost path.