The five documents that cut off joint liability

Section 30 of the Ley de Contrato de Trabajo is the rule under which an operator or a construction firm ended up paying the wages and charges its contractor did not. Ley 27.802 rewrites it and gives it a closed list of five things that must be requested from the contractor: the CUIL number of each worker providing services, proof of monthly payment into the social security subsystems, proof of payment of wages, details of an account in the worker's name where they are paid, and workplace-risk insurance with an endorsement in favour of the principal. And then the sentence that changes the decision: "compliance with the control of the requirements referred to in this paragraph relieves the principal of all liability". It adds two further points: the principal is also not liable "for false information provided" by the contractor, and if it fails to request that data, it is jointly liable — that is, it is the failure to carry out the control, not the contractor's default, that triggers joint liability. The section also narrows which work is covered: that corresponding "to the establishment's own normal and specific activity, within its scope, excluding ancillary or auxiliary activities". The other three sections of the block point the same way: s. 29 makes the worker the direct employee of whoever registers the relationship, and limits the user company's joint liability "exclusively" to obligations "accrued during the time of actual service" for it, with a right of recourse against the principal obligor. Section 29 bis keeps joint liability with temporary staffing agencies and adds that the temporary worker is governed by the collective agreement of the activity where they actually work and may not stand for or hold union office at the user company. And s. 31 limits joint liability within a corporate group: related companies answer for each other "only where there has been fraudulent conduct". verif · Mar 6, 2026 ↗

In force with the law, from 6 March 2026. The four sections are self-executing: they delegate no regulation and set no adjustment period. verif · Mar 6, 2026 ↗

To both ends of every contracting chain, which in an oil field or a mining project means almost every company on site. On the hiring side — operator, main contractor, construction firm — the list of five documents is now a procurement procedure with direct legal consequences: asking for it and filing it cuts the exposure; not asking for it creates it. On the satellite supplier side, it changes what a large client will demand before adding them to its vendor list: the CUIL of each of their people, social security and wage payments up to date, bank accounts in each worker's name, and workplace-risk insurance endorsed in favour of the principal, which is the document most often overlooked. ⚠️ It is a new barrier to entry for whoever works informally, and an advantage for whoever is already formalised. verif · Mar 6, 2026 ↗