Two beliefs send buyers into a small-business deal in Spain or Portugal with the wrong number in their head. One is "I'll take it over and bring in my own people." The other is its mirror image: "I'm only buying the assets, so the staff aren't my problem." Both misread the same rule — and the rule is not the one most free answers give you.
Staff do not transfer because you bought a business. They transfer because what changed hands was an economic unit that keeps its identity. That distinction decides whether you inherit a payroll, and it is written into both statutes.
The condition, in both countries, is the same idea
Spain states the effect and then defines when it applies:
«El cambio de titularidad de una empresa, de un centro de trabajo o de una unidad productiva autónoma no extinguirá por sí mismo la relación laboral, quedando el nuevo empresario subrogado en los derechos y obligaciones laborales y de Seguridad Social del anterior […]»
«[…] se considerará que existe sucesión de empresa cuando la transmisión afecte a una entidad económica que mantenga su identidad, entendida como un conjunto de medios organizados a fin de llevar a cabo una actividad económica, esencial o accesoria.»
— Art. 44.1 and 44.2, RDLeg 2/2015, Estatuto de los Trabajadores · BOE, retrieved 9 Jul 2026. Unofficial translation: a change of ownership of a company, workplace or autonomous productive unit does not by itself end the employment relationship; the new employer is subrogated into the previous employer's labour and Social Security obligations. A business succession exists where the transmission affects an economic entity that keeps its identity — an organised set of means for carrying on an economic activity.
Portugal words it as the transfer of the employer's position — and, in the same sentence, hands you something buyers rarely price in: liability for the previous owner's labour-offence fines.
«Em caso de transmissão, por qualquer título, da titularidade de empresa, ou estabelecimento ou ainda de parte de empresa ou estabelecimento que constitua uma unidade económica, transmitem-se para o adquirente a posição do empregador nos contratos de trabalho dos respectivos trabalhadores, bem como a responsabilidade pelo pagamento de coima aplicada pela prática de contra-ordenação laboral.»
«Considera-se unidade económica o conjunto de meios organizados que constitua uma unidade produtiva dotada de autonomia técnico-organizativa e que mantenha identidade própria, com o objetivo de exercer uma atividade económica, principal ou acessória.»
— Art. 285.º(1) and 285.º(5), Código do Trabalho (Lei 7/2009, consolidated) · Diário da República, retrieved 9 Jul 2026. Unofficial translation: on a transfer, by any title, of ownership of a company, establishment, or part of one constituting an economic unit, the employer's position in the employment contracts passes to the acquirer, together with liability for payment of any fine imposed for a labour offence. An economic unit is an organised set of means forming a productive unit with technical-organisational autonomy that keeps its own identity.
Where the line actually falls — two judgments
The condition is not decorative. Portugal's Supreme Court has repeatedly held that when a client simply awards its security contract to a different firm, and no workers and no organised resources move across, there is no transfer of undertaking at all — so nobody inherits anybody:
«Sendo a atividade de segurança privada uma atividade que repousa fundamentalmente sobre a mão de obra, inexiste transmissão de estabelecimento quando uma empresa deixa de prestar serviços de vigilância e segurança junto de determinado cliente, na sequência de adjudicação (por este) de tais serviços a outra empresa, sem que para esta tenha transitado daquela qualquer trabalhador ou quaisquer outros recursos, competências ou instrumentos organizatórios, suscetíveis de consubstanciar uma "unidade económica".»
— Supremo Tribunal de Justiça, processo 1150/20.2T8EVR.E1.S1, judgment of 13 September 2023 (rapporteur Mário Belo Morgado; unanimous), sumário I · dgsi.pt, retrieved 9 Jul 2026. Unofficial translation: private security being a labour-intensive activity, there is no transfer of an establishment where a company ceases to provide security services to a client after the client awards those services to another company, without any worker or any other resources, skills or organisational instruments passing across, capable of constituting an "economic unit".
The court had reached the same conclusion six years earlier, testing whether what moved was «uma unidade económica, organizada de modo estável, que mantenha a sua identidade e seja dotada de autonomia» — a stably organised economic unit, keeping its identity and possessed of autonomy (STJ, processo 357/13.3TTPDL.L1.S1, 6 December 2017, rapporteur Ana Luísa Geraldes; unanimous). And where the unit does move, the effect is exactly as written: the employer's position in the contracts passes to the acquirer (STJ, processo 14565/18.7T8PRT.P1.S1, 12 October 2022).
Note what the judges are examining. Not the label on the contract. Not whether the parties called it a traspaso or a trespasse. They ask whether an organised, identifiable productive unit crossed over — and what makes up that unit depends on the business. In a labour-intensive activity like security, the court said the activity «repousa fundamentalmente sobre a mão de obra», so where no staff and no organised resources moved, nothing transferred. In a shop, a workshop or a guesthouse, the premises, equipment, licences, goodwill and customer channels may all be relevant evidence, and taking them over while continuing the same operation points towards a transfer rather than away from it. None of them decides the issue on its own. The question stays the same: did an organised economic unit, with its identity, actually move?
So the judgments are not a route around the payroll. They are the test the court applies, and the test cuts both ways: it is the substance of what changes hands that governs, not how the deed is titled and not whether the contract lists the staff. If staff are dismissed shortly before completion, that does not automatically end the analysis: it may raise separate questions about the reason, the timing and the legal effect of those dismissals, and about which employment liabilities remain live in the transaction. Whether the rules bite on your deal is a question of fact about your deal, and one for a local employment lawyer.
What follows the staff — and for how long
- A change of owner does not, by itself, end anyone's employment. Spain says it in terms: the change of ownership «no extinguirá por sí mismo la relación laboral» (Art. 44.1 ET). Whatever you may want to do about staffing afterwards stands on its own legal footing — the ordinary grounds and procedures — and is not something the purchase itself delivers.
- Their terms travel with them. Portugal: the transferred workers keep «todos os direitos contratuais e adquiridos, nomeadamente retribuição, antiguidade, categoria profissional» (Art. 285.º(3) CT). Spain: the new employer is subrogated into the previous employer's labour and Social Security rights and obligations, including pension commitments as governed by their specific rules (Art. 44.1 ET). Seniority is not reset by a change of owner.
- Old unpaid wage debts do not vanish. In Spain, transferor and acquirer are jointly and severally liable for three years for labour obligations arising before the transfer and left unsatisfied (Art. 44.3 ET). In Portugal, the buyer steps into the employer's position by operation of the statute (Art. 285.º(1)), while the seller stays jointly liable for two years for workers' credits fallen due up to the transfer, and the corresponding social charges (Art. 285.º(6)).
- Portugal adds the fines. Liability for payment of a fine imposed for a labour offence («coima aplicada») passes to the acquirer along with the contracts (Art. 285.º(1)) — so a business with an inspection history deserves a direct question about any labour-authority proceeding, decided or pending.
- The regime also catches leases of the business. It applies to the transfer, assignment or reversion of the exploração of a business or economic unit, with the immediately preceding operator jointly liable on an assignment or reversion (Art. 285.º(2) CT).
- There is a procedure before the handover. In Portugal the transfer may only take place once the steps for the workers' representative committee — its designation period, or the consultation — have run their course (Art. 285.º(7) CT). If the regime applies, the labour-law transfer cannot simply be scheduled as though that timing did not exist.
What to establish before you make an offer
The staff list, with hire dates. Seniority is money: it prices any future termination, and it transfers untouched. A "we have three people, all recent" that turns out to be three people with eleven, nine and seven years is a different business at the same price.
Whether an economic unit is what you are buying. Premises, licence, equipment, clientele, staff — the more of these that cross over as an organised whole, the more firmly the succession rules apply. If a seller assures you they do not, ask on what the assurance rests, in writing.
The wage, contribution and inspection position. Unpaid wages reach across the transfer in both countries; in Portugal an imposed labour fine follows the contracts. Ask for the Social Security position, and ask whether the labour authority has ever imposed a fine on this business.
Why the free answer feels firmer than the law is. Generic AI answers tend to flatten this into a flat "yes, you must keep them" — no condition, no source. The statutes are conditional: the employer's position passes where an economic unit that keeps its identity transfers. Whether that describes your purchase is a question about your deal, not about Spain or Portugal, and it is settled on the facts rather than on a general rule.
Workforce succession is one of the tripwires in every screen I run. Before you commit, I check what transfers with this specific business, what it costs you, and exactly what to demand from the seller first.
Check my deal →Basis: the statutory and judgment texts quoted above, retrieved from the Boletín Oficial del Estado (Spain), the Diário da República (Portugal) and the Supremo Tribunal de Justiça database (dgsi.pt) on 9 July 2026; the case references are given so you can read the sumários yourself. The judgments cited concern private security and are quoted for the legal test they apply, not as a prediction about any other business. General information about how the rules work, not legal or employment advice; whether an economic unit transfers, and what any of it means for a dismissal, turns on the facts of a specific deal, which a local employment lawyer should confirm — a gestor or contabilista can confirm payroll and social-security mechanics, not the transfer analysis. Not a statement about any current listing.