Crypto and Spain's Tax Agency: Declare or Ignore?

Crypto and Hacienda: Declare, Report, or Look Away

Do you have to declare cryptocurrencies to the Spanish tax agency (Hacienda)? The short answer is yes, at least for capital gains when they occur. The long answer is that half of Spain's crypto community is unclear about what, how, and when to report, and a significant portion has decided not to do so. This discussion starts with an investor who states plainly: he moved money between his bank and an exchange, didn't withdraw more than he deposited, and therefore considers there is nothing to declare. "I will declare something if I am forced to," he summarizes. Behind this statement lies a fundamental problem that goes far beyond fiscal laziness.

Ignorance does not exempt, but it does not solve either

The first argument presented is the oldest in the tax manual: the obligation exists even if unknown. Those operating with cryptocurrencies are required to declare, and ignorance or reluctance does not relieve them of compliance. So far, basic doctrine. The problem is that the average taxpayer cannot find official documentation explaining step by step how to tax an asset that changes shape and value several times a day. The complaint is repeated: there is no clear guide from any Spanish body detailing the procedure. And without a procedure, the temptation of inaction grows.

Some argue that it is enough to apply the logic of stocks: buy, sell, and pay tax on the difference. Others add that the tool—a accounting program like Cointracking or an Excel sheet—is secondary; what matters is having the record. The discussion about whether that software is "approved" or not is largely misplaced: no program certifies data to the administration, it only organizes numbers so the taxpayer or their advisor can present them.

Form 720 and the December 31 snapshot

Here comes one of the most technical and misunderstood points. Form 720 is an informative declaration for assets abroad, and its threshold is set at €50,000. The doubt running through the entire conversation is whether cryptocurrencies held on a foreign exchange fall under this form. Some argue yes, that platforms outside Spain require reporting, and doing it incorrectly or not doing it can lead to serious problems. The counterpoint: if cryptocurrencies are in a wallet where the user controls the private keys, they are considered to be where the holder is, i.e., in Spain, and Form 720 would not apply on that basis.

From this arises a common practice: moving funds from the exchange to a personal wallet before the year ends, so that the "snapshot" on December 31 shows no balance on foreign platforms. The maneuver has formal logic, although it does not solve the underlying problem: swaps and gains remain, and income tax (IRPF) does not evaporate by changing the location of tokens.

The swap: the knot nobody wants to untie

The most contentious point is the treatment of swaps between cryptocurrencies. Changing bitcoin for ether, or ether for any other token, is considered a taxable event: if the delivered asset has appreciated, there is a capital gain to declare, even if not a single euro is involved. This interpretation generates almost unanimous rejection. The argument is common sense: if there is no conversion into fiat currency, what is actually gained? Why should Hacienda care that the profit of one token was reinvested in another?

The practical problem is volume. A trader making five operations a day generates over 1,800 movements a year. Detailing each swap with its date, value, and gain is, in practice, corporate accounting for an individual. The circulating proposal is simpler: declare what enters minus what leaves, apply the corresponding percentage to the gain, and submit the exchange extract if requested. Let the administration do the rest.

The narrative of antiestéticar and the narrative of impunity

Against those who argue that Hacienda lacks the means and capacity to control cryptocurrencies, the reverse appears: foreign exchanges do not provide information automatically and generally, and any request requires an individualized process. The conclusion drawn in some messages is clear: if you don't say it, Hacienda doesn't know. Hence the recommendation not to use Spanish banks, not to leave balances on platforms longer than necessary, and to keep keys in a personal wallet.

Personal experience also has its place. Some recount years of peer-to-peer operations with KYC exchanges and European banks, amounts of tens of thousands of euros annually, and no requests. The conclusion they draw is that control is more limited than advertised. The counterargument is equally forceful: that is not impunity, it is just that the letter has not arrived yet. And when it arrives, it will come with the entire history together.

The fine print that is indeed written

Beyond opinions, there is a recurring fact worth retaining: the obligation to report cryptocurrencies exists, and the gain threshold that triggers declaration is generally set at €10,000, with particularities in the Basque Country and Navarre, where declaration starts from the first euro. Box 389 of the income tax return is where the asset increase is recorded. And the calculation method is FIFO: first in, first out.

The conclusion imposed in the conversation is that the system is not designed for the small investor, but for those moving volumes that justify the effort. For retail investors, the repeated practical recommendation is to keep an orderly record of dates, amounts, deposits, withdrawals, and swaps, and have it available for the manager just in case. The question left in the air is the usual one: if Hacienda does not have the means to control, why must the taxpayer do the accounting work for it? The answer, for now, is that the obligation belongs to the taxpayer. Everything else is literature.