Crypto and Spanish tax: Form 721, sales and swaps

Spanish crypto tax starts with one clear point: Form 721 does not replace income tax. Every sale for euros and every crypto-to-crypto swap is a capital gain or loss measured in euros at market value, even if no cash reached your bank account.

How sales and swaps are taxed

For Spanish personal income tax, the gain is the transfer value minus the acquisition value, generally using FIFO when there are several purchases. Gains fall under savings income at rates of 19%, 21%, 23%, 27% and 28% depending on the bracket. Swapping bitcoin for ethereum, paying with crypto, and partial sales are all taxable events. Exchange fees can be added to cost or deducted from proceeds with proper records.

What Form 721 reports

Form 721 reports virtual currencies held abroad on 31 December when the combined value exceeds 50,000 euros. It is filed electronically from 1 to 31 January, with balances, keys and custodians. It creates no tax charge itself; it is informational and lets the tax agency cross-check exchange data. Once filed, it is only repeated when the balance grows by more than 20,000 euros.

Penalties for missing filings

Missing crypto gains can trigger late-payment surcharges of 1% per month plus interest, and penalties of 50% to 150% where concealment is found. A missing Form 721 is treated as a formal infringement, with fines ranging from 150 to 20,000 euros under the general regime. Keeping CSV exports, wallet addresses and bank proof reduces the risk of a harsher assessment.

How to put things in order

Gather full history: exchange CSVs, wallet addresses, dates, euro prices and bank statements. Recalculate on a FIFO basis, file supplementary returns for years still open, and consider filing any missing Form 721 before the agency opens a procedure, as voluntary correction allows lower surcharges to be discussed. Complex tracing benefits from tax advice to check the audit trail.

If you hold balances abroad or have unreported swaps, request your first consultation with no obligation. We review your transactions and outline clear steps and deadlines to regularise them properly.