Is undeclared cash money laundering?

Not necessarily. For undeclared money to constitute a tax offence, the defrauded amount must exceed €120,000; below that there is a tax infringement, but no predicate offence — and without a predicate offence there is no laundering. The obliged entity must still examine any unusual activity put in front of it.

What is money laundering — and what isn't?

Q: What is money laundering?

Passing off as legitimate funds that come from a crime. Three conditions are needed: a prior offence with economic content; the intent to disguise the illicit origin of that money; and doing so through apparently legal operations — buying a flat is legal, buying it with kidnapping money is laundering.

Money laundering is passing off as legitimate funds that come from a crime. For it to exist, three conditions must be met: (1) a prior offence with economic content; (2) the intent to disguise the origin of that money, by the offender or by whoever helps them; and (3) the attempt being made through apparently legal operations. Buying a flat is a legal operation; buying it with the proceeds of a robbery turns it into laundering.

The classic confusion: undeclared cash. For many people the first thing that comes to mind is money hidden from the tax authorities. That kind of laundering exists too, but remember that for there to be a tax offence the defrauded amount must exceed €120,000. The three thousand euros your aunt keeps under the mattress because she never declared them when she sold that inherited painting are reproachable — and sanctionable by the tax authorities — but there is no predicate offence, and without a predicate offence there is no laundering.

Who this international system really pursues: drug trafficking, organised crime, corruption and terrorism — criminals who need to use illicitly obtained money as if it were legitimate. In terrorist financing the scheme flips: the money may be of legal origin, and what is illicit is its destination.

And here is where you come in, obliged entity. The conduct you must detect is, taken in isolation, legal conduct — a sale, a deposit, a transfer — that its details make suspicious. That is why the legislation chooses the professionals of each sector as watchers: you need to know a business to notice that an operation does not fit it. That professional judgement — not paranoia — is what we build in training and what we assess in every annual exam.

Legal basis and official sources:

Art. 1 of Ley 10/2010 (definition)
Art. 305 of the Spanish Criminal Code (tax offence: defrauded amount above €120,000)

Reviewed: August 2026 · PBK Asesores — external experts in AML/CTF before SEPBLAC since 2010, more than 900 exams performed.

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