Every listing sells you a storefront: a name over a door, photographs, a turnover figure. But you cannot buy a storefront. You buy from a legal person — a company or a self-employed individual with a tax ID — and Spanish law attaches history to that person and to the activity it ran. The public logic of checking a deal therefore runs in one direction only: the sign → the legal operator → the operator’s history. Skip a link in that chain and everything you established downstream may belong to somebody else’s story.
1. Without the NIF, every register is unusable
The first question that unlocks everything else: which legal entity or self-employed person operates this business, and what is its NIF? A trade name is not enough — the registers hold the legal name, not the sign, and companies with similar names are common. Sellers often keep the entity out of a public listing so that staff and landlords do not learn of the sale — an ordinary, legitimate reason. It is not a reason to withhold it from a serious buyer who asks in writing.
Source: the published guide how to check a business-for-sale listing, and the public registers linked there.
2. The entity found is not the seller proved
Company acts — incorporations, administrator appointments, dissolutions — are published in the daily BORME bulletin. A practical free first pass is a web search of the exact legal name restricted to boe.es, then the variants: with and without «S.L.», with and without accents.
Two rules have to be held at once, and most checklists keep only one. Finding the company does not mean the listing is genuine — real companies’ names get borrowed, and the person emailing you may have no connection to the entity. Not finding it does not mean a scam — many legitimate small businesses are sole traders who appear in no company register at all, and a traspaso is often just a lease assignment with no company behind it.
The follow-up question is capacity: in what capacity is this person selling — owner of the shares, spouse, attorney, broker with a written mandate? A legitimate answer exists in every honest case; get it in writing. The free layer is a first pass — the authoritative current record is a paid extract from the Registro Mercantil.
Source: same published guide; BORME (boe.es/diario_borme); Registro Mercantil noted there as the paid authoritative record.
3. Why the history matters: liability follows the activity
Under art. 42.1.c) of the Ley General Tributaria (Ley 58/2003), whoever succeeds to the ownership or exercise of an economic activity can be jointly and severally liable for the prior operator’s business tax debts — the tax administration can pursue the buyer directly. The one mechanism that can cap this is the certificado de sucesión de actividad (art. 175.2 LGT), validly requested before completion with the seller’s cooperation: liability is then generally limited to what the certificate lists, and three months of silence after a valid request operates in the buyer’s favour. It covers state taxes only — Social Security, regional and municipal taxes, labour and supplier debts all sit outside it.
And here is the chain-of-title sting. The statute speaks of the anterior titular — the previous holder. Where a business has passed through several hands, it is not settled whether liability can reach debts left by earlier, non-immediate holders, nor how far a certificate obtained with the current holder’s consent protects a buyer in that situation. On 29 May 2026 Spain’s Supreme Court admitted a cassation appeal raising exactly those questions. An admission settles nothing — it means the point is open at the highest level. Which is why «who held this business before this seller» is not archaeology. It is exposure.
Sources: the published notes on the art. 175.2 certificate and on multi-hand succession, citing Ley 58/2003 arts. 42.1.c and 175.2.
Two local realities
A search result is not a certificate — of anything. Free searches lag, miss spelling variants and accents, and show published acts rather than the current registered state. The honest formula for your own notes, with the date, is: no match for this name, in this source, on this date, searched this way. Nothing stronger. If a result matters later, that written line is what protects you.
Money before the operator is named is the one hard pause. An evasive answer about the entity proves nothing by itself. But a request for a deposit made before the operating entity is identified means none of the checks above can even begin — treat that payment request as not yet documented, and put the NIF question back at the top of your written list.
Request before any deposit
The NIF and exact legal name of the operating entity or self-employed person, in writing.
The seller’s capacity, in writing — owner, shareholder, attorney, or broker with a written mandate.
A current Registro Mercantil extract — the paid, authoritative record — or the seller’s willingness to provide one, which is itself informative.
The history question, asked plainly: how long has this operator run this activity at these premises, and who ran it before?
The art. 175.2 certificate planned before completion — with the seller’s cooperation, in time for the three-month window. A request made after completion does not carry the same effect.
Your search log — dates, exact queries, exact sources — kept in writing.
A prompt worth stealing
Fill the brackets and paste into any AI assistant:
I am considering a small business for sale in Spain: [paste the listing text]. Draft (1) the written questions that establish the chain of title — the exact legal name and NIF of the operating entity or self-employed person; the capacity in which the seller is selling; how long this operator has run this activity at these premises; and who ran it before; (2) the document list to request before any deposit — a current Registro Mercantil extract, and the art. 175.2 LGT certificate planned before completion with the seller’s cooperation; and (3) a dated search-log template for my own free BORME pass, with the exact legal-name variants to query. Do not tell me whether the listing is genuine or the business is sound — questions and document names only.
The assistant drafts questions; it does not check the business.
Establishing the legal person behind a listing is the first thing a screen does. Before you commit, the public record is mapped for your specific deal — what it shows, what it cannot show, and exactly what to demand from the seller in writing.
Check a listing →Basis: the statutory text of arts. 42.1.c and 175.2 of Ley 58/2003, and the Supreme Court admission of 29 May 2026, as cited in the published notes linked above. General information about how to use public sources and how the rules work — not legal or tax advice, and not due diligence. What any result means for a specific transaction is a question for a lawyer, tax adviser or gestor in Spain. This article does not determine whether any listing, seller, broker or company is genuine, and is not a statement about any current listing. No client cases are described here. Rules and checklists are habits, not guarantees.