Practical regulations
Managing joint liability for works
When a condominium commissions works from a contractor, signing the contract and waiting for the job to finish is not enough. Under Italian tax and civil law, the commissioning party and the contractor share joint liability for tax withholdings and social security contributions owed on the workers employed, and the building manager is personally accountable if the required checks are skipped. Added to this are the risks of unauthorized subcontracting, site safety obligations and proper record keeping. This guide walks through how to organize the checks, which documents to request before authorizing payments, and how to build a file that protects the condominium in case of inspections or disputes.
What joint liability means and when it applies
In a works or services contract, the commissioning party is jointly liable with the contractor for the tax withholdings on employee income owed by the contractor in relation to the work carried out under the contract, and for the social security contributions and insurance premiums referable to the workers employed on the job. For a condominium, which is normally a non-business commissioning party, joint tax liability concerns in particular the withholdings the contractor pays on its own employees during the execution period.
The same logic extends to safety obligations: the commissioning party must verify the technical and professional suitability of the contracting firm and, on sites with multiple firms, must coordinate the work, a duty that in a condominium falls on the building manager acting as commissioning party. Ignoring these duties does not remove the liability, it makes it worse if an accident or a tax irregularity comes to light later.
Checks to run before authorizing each payment
Before settling the contractor's invoices, the building manager should gather a minimum set of documents proving the firm's regularity:
Keeping an updated file per supplier avoids having to chase documents after the work is finished, when they are harder to obtain and the window to withhold a payment has already closed.
- a valid compliance certificate, checked at the date of each payment and not only at the start of the contract
- an updated business registry extract to confirm the company's activity and the absence of insolvency proceedings
- a certification or self-declaration on the withholdings paid for the workers employed on the specific contract
- the contractor's liability insurance and, for structural works, builder's risk insurance if required by the contract
- a risk assessment for interference hazards when multiple firms operate on the same site
Subcontracting: what the building manager can authorize
Unauthorized subcontracting exposes the condominium to further risk, because the subcontracting firm escapes the checks already set up for the main contractor. The works contract should prohibit subcontracting without written consent and, when the assembly authorizes it, the building manager must extend the same document checks, compliance certificate, registry extract, withholdings, to the subcontractor before allowing access to the site.
It is good practice for the minutes authorizing the subcontract to explicitly name the subcontracting firm, the scope of work being transferred and the share of the contract involved, so that joint liability remains traceable job by job.
Records to keep and for how long
The works file should include the contract, the specifications, the assembly minutes approving the works and any variations, the compliance certificate for each payment stage, invoices with the withholding detail, the accident log or evidence of no incidents, and the final acceptance certificate. This documentation matters both in a tax audit on the amounts paid and in a dispute with owners or with the contractor itself.
Management software such as AmministraPro helps keep these documents together in the condominium's digital file, with payment history linked to the related checks, so an incoming manager or the auditors' board finds everything traceable instead of having to rebuild each invoice's history by hand.
What to do if an irregularity emerges after the works
If, after the works are completed, it emerges that the contractor failed to pay the withholdings or contributions due, the condominium can be called to answer jointly within the limits set by tax law, without prejudice to its right of recourse against the contractor. For this reason it is advisable, whenever possible, to hold back a share of the payment as a guarantee until the final compliance certificate is received and proof of the payments for the last stage of the site is provided, with this clause stated in the contract approved by the assembly.
Frequently asked questions
Is the condominium always jointly liable for the contractor's tax debts?
Joint liability covers the tax withholdings on employee income and the social security contributions for the workers employed in executing the contracted works, not the firm's general tax debts. Checks should therefore focus on the regularity of the payments relating to the staff working on that specific site, requesting updated certifications or self-declarations at each progress stage before authorizing payments.
Who actually checks the contractor's compliance certificate, the manager or the assembly?
The technical verification of the documents is the building manager's responsibility, acting as the condominium's agent in the day-to-day management of the works contract. The assembly approves the contract and the amount of the works, but the periodic check of the compliance certificate, registry extract and withholdings falls among the conservative and management acts the manager must carry out independently, later reporting on them in the financial statement.
What happens if the contractor subcontracts without authorization?
Unauthorized subcontracting is a breach of contract by the main contractor and deprives the condominium of the preventive checks on the incoming firm's regularity. The building manager should formally challenge the breach, suspend the unauthorized firm's access to the site until the documentation is regularized, and discuss with the assembly any penalties provided for in the contract.
How long should records of contracted works be kept?
There is no single deadline: timeframes vary depending on the nature of the document, tax, social security, civil law, or linked to the decade-long guarantee for serious defects in buildings under Italian civil law. As a precaution it is advisable to keep the entire file, contract, compliance certificates, invoices and acceptance minutes, for an extended period, covering both tax audits and possible disputes over the quality of the work in later years.
Can condominium management software replace the legal checks on a contractor?
No, the document checks remain an act the building manager must personally carry out, verifying the compliance certificate, registry extract and withholding certifications. A tool such as AmministraPro does not replace this control but helps organize it, keeping the collected documents in the condominium's file and linking them to invoices and payments, so checks already performed stay traceable over time instead of being scattered across emails and separate folders.
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