Monero and privacy cryptocurrencies: tax implications in Spain

Monero (XMR), Zcash, and other privacy cryptocurrencies pose unique challenges. Although legal in Spain, their opacity requires special care in the tax registry.

#Monero and privacy cryptocurrencies: tax implications

Monero (XMR), Zcash (ZEC), Dash and other privacy cryptocurrencies are completely legal in Spain. However, they pose specific challenges for both the taxpayer and the Treasury.

What makes Monero different?

Monero uses three privacy technologies:

Ring Signatures: Mix your transaction with others, hiding the origin.
RingCT: Hides the amount of each transaction.
Stealth Addresses: Generates unique addresses per transaction, making it impossible to link transactions to a holder without the private key.

The result: Monero transactions are effectively untraceable without user keys.

Are they illegal in Spain?

No. In Spain, the possession or use of Monero is not prohibited. However:

Several exchanges (Kraken, Binance) delisted XMR in Europe after regulatory pressures.
Exchanges that operate in Spain are required to report to the AEAT.
Using Monero to evade taxes would be a tax crime (as with any asset).

Your tax obligation with Monero: exactly the same as with BTC

The fact that transactions are private does not exempt them from the obligation to declare them. The taxpayer has faith of his own transactions (he is the one who has the keys).

Purchase of XMR with euros: write down date, price and cost (including commission).
Sale of XMR for euros: difference vs. FIFO cost = capital gain/loss.
Swap XMR ↔ BTC or other crypto: transmission. Profit/loss on XMR.

The real risk: the burden of proof is reversed

If the Treasury detects unjustified inflows of money and you cannot explain them:

It is presumed that they are hidden income → unjustified capital gain at the marginal rate of personal income tax (up to 47%) with added penalty.
Using Monero does not protect you if the money ends up entering your Spanish bank account in euros.

The chain of tests:

Spanish bank → Buy XMR with euros (registerable in bank/exchange) 
→ XMR operations (there is opacity here) 
→ Sale XMR to euros → Spanish bank (registerable)

The ends are traceable. The Treasury can detect entries of euros without justification of origin.

##Zcash: optional privacy

Zcash offers two types of transactions:

Transparent (t-addresses): Same as Bitcoin, fully auditable.
Shielded (z-addresses): Private, opacity similar to Monero.

Many exchanges only accept ZEC on transparent addresses, effectively limiting privacy.

##Dash:PrivateSend

Dash has PrivateSend, an optional coin mixing feature. Its use is not mandatory and most Dash transactions are transparent.

Recommendations for privacy coins users

Keep your own detailed record: Even if the blockchain doesn't show it, you know it and can document it.
Save screenshots of operations on exchanges, transaction confirmations, etc.
Do not use privacy coins to hide income: The legal risk (tax crime) outweighs any apparent advantage.
Consult with advisor: The regulatory framework for Monero is more uncertain than that of BTC.

Model 720/721 and Monero

The same reporting obligations apply. If you have >€50,000 in XMR on exchanges or self-custodied, you must declare it. The problem is if the exchange no longer operates in Spain → self-custody → 721 is still mandatory.

Updated: April 2026 | Fiscal year: 2025