Employee moonlighting: when a second job is lawful and when it leads to dismissal.

The warehouse worker who delivers parcels for a rival courier at weekends. The technical sales rep who, at the end of the shift, serves on his own account the very clients he manages for the company. The office employee who registers as self-employed and offers her employer's services at lower prices. Employee moonlighting is one of the situations HR managers and business owners bring to us most often, and it almost always comes with the same question: can I dismiss them?

The answer is not automatic. In Italy having a second job is not prohibited in itself, and a dismissal built on suspicions or office gossip risks turning into a lost case, with reinstatement or compensation borne by the company. This guide explains when a second job is lawful, when it becomes a breach of the duty of loyalty that justifies dismissal, which rules apply in public employment and how to gather evidence that holds up before the labour court.

Is having a second job prohibited? What the law says

The starting point is freedom to work: a private-sector employee may, in principle, carry out another activity, as an employee or self-employed, outside contractual working hours. The limit lies not in the second job itself but in its impact on the main employment relationship. There are three sources to bear in mind:

• The duty of loyalty (art. 2105 c.c.): the worker may not conduct business, on their own account or on behalf of third parties, in competition with the employer, nor disclose or use information about the company's organisation and production methods in a way that could harm it.
• The duties of fairness and good faith (artt. 1175 e 1375 c.c.): case law reads them together with art. 2105 c.c., extending the duty of loyalty to any conduct that, by its nature and consequences, is incompatible with the duties arising from the worker's place within the company.
• The individual contract and the national collective agreement (CCNL): many contracts require other activities to be disclosed, or include exclusivity clauses or specific limits. Breaching a signed clause is already, in itself, a breach of contract.

The non-compete agreement (art. 2125 c.c.) is a different matter, as it applies after the employment relationship has ended: we cover it on the page dedicated to investigations into breaches of non-compete agreements.

When a second job justifies dismissal

Case law is extensive, but the situations in which a second job seriously damages the bond of trust, and can therefore lead to dismissal for just cause (art. 2119 c.c.) or for justified subjective reason, fall into a few families:

• Competing activities: working for a competitor, starting a business in the same sector or serving the company's clients on one's own account. According to settled Court of Cassation case law, breaching art. 2105 c.c. does not require the damage to have already occurred: it is enough that the conduct is potentially harmful to the company's interests.
• Exploitation of company information: price lists, contacts, know-how and projects used to benefit the second activity. It often overlaps with the poaching of clients and employees.
• Working during working hours or paid absences: the second job carried out while the employee is officially on a business trip, on leave or off sick. The latter is the most frequent case, and we deal with it in the guide on the employee on sick leave and abuse of Law 104.
• Activities that compromise the main job: night shifts elsewhere that translate into fatigue, errors and safety risks, especially in sensitive roles such as driving vehicles or operating machinery.
• Breach of a contractual ban on outside work or of the disclosure obligation set out in the contract.

The principle of proportionality still applies: an occasional activity, in a completely unrelated sector and with no effect on job performance, will hardly justify dismissal. That is why the quality of the evidence - continuity, hours, sector, clientele - makes the difference between a lawful dismissal and one that is overturned.

Second jobs in public employment: incompatibility and authorisations

For public employees the rules are much stricter. Art. 53 of D.Lgs. 165/2001, which refers to the incompatibility regime of artt. 60 et seq. of D.P.R. 3/1957, generally prohibits commercial, industrial and professional activities and makes paid outside assignments subject to prior authorisation from the employing administration. Exceptions include, among others, part-time employees working no more than 50% of full time, within the limits set by law.

The consequences of a breach are serious: in addition to disciplinary liability, which in the most serious cases leads to dismissal, any fee received without authorisation must be paid over to the administration. For public bodies and publicly owned companies, a documented finding is often the prerequisite for starting proceedings.

Can an employer have an employee investigated?

Yes, within precise boundaries. The Workers' Statute (L. 300/1970) prohibits having external staff monitor the work activity in the strict sense, that is, the way the employee performs their duties, and art. 8 prohibits inquiries into opinions and facts not relevant to the assessment of professional aptitude. Court of Cassation case law instead recognises the legitimacy of defensive checks entrusted to an investigation agency when they are aimed at ascertaining unlawful conduct or conduct otherwise damaging to the bond of trust, such as a second job in competition or one carried out during a paid absence.

For the evidence to be usable, three conditions are needed: a concrete suspicion (not blanket checks on staff), observation limited to public places or places open to the public, with no intrusion into the home or into communications, and an assignment entrusted to an agency holding a Prefecture licence under art. 134 TULPS, which processes data in compliance with the GDPR (EU Regulation 2016/679).

How to prove an employee has a second job: the investigative method

In litigation the employer bears the burden of proving the facts alleged. An anonymous tip-off or a photo on social media is not enough: what is needed is precise, repeated and verifiable evidence. An investigation into a second job is built on lawful, verifiable sources:

• Field observation: stakeouts and tailing in public places, with dated photographic and video records, to document where the employee goes, how often, at what times and in what role.
• Public registers: company registry searches on corporate offices, shareholdings, sole proprietorships and businesses traceable to the worker or to family members who may act as a front.
• Open sources (OSINT): websites, professional profiles, listings, reviews and adverts linking the employee to the second activity. For the method, see our OSINT investigations.
• Company records: attendance, business trips, expense claims and leave provided by the client, to be cross-checked against what was observed so that overlaps come to light.

The result is an investigative report with a chronology of the observations, photographic material and documentary findings, designed to be attached to the disciplinary charge and filed in court. The investigators who carried out the assignment may be called as witnesses to confirm its contents.

From evidence to disciplinary charge

Once the evidence has been gathered, the procedure under art. 7 of the Statuto dei Lavoratori (the Workers' Statute) requires a written, specific and timely charge: letting too much time pass between learning of the facts and bringing the charge may lead the conduct to be deemed tolerated. That is why it is useful to involve the company's employment consultant or lawyer from the outset, who will assess the proportionate sanction and the timing, while the investigation provides the facts on which to base it.

Frequently asked questions on employee moonlighting

Can a part-time employee have a second job?

Yes: part-time work is in fact the situation in which a second job is most common. The duty of loyalty, the ban on competition and any clauses in the contract still apply.

Does an employee have to tell their employer about a second job?

The law does not impose a general obligation in the private sector, but many individual and collective contracts introduce one. In public employment, prior authorisation is required instead.

Can you work while on holiday?

Annual leave is meant for physical and mental recovery, but an activity carried out during that period is not unlawful in itself. It becomes relevant if it competes with the company or if, by its nature and intensity, it prevents the employee from returning to work in a fit condition.

Is the investigative dossier valid as evidence in court?

Yes, if the investigation was carried out by an authorised agency, within the limits of defensive checks and without violating the worker's privacy. The judge assesses the report together with the investigators' testimony.

Second job investigations in Milan and Lombardy

Arcadia Company operates from its Sesto San Giovanni headquarters for companies, public bodies and law firms in Milan, the North Milan area and throughout Lombardy, with an ISO 9001 certified method and staff authorised under art. 134 TULPS. If you suspect that an employee is carrying out a competing or incompatible activity, find out how we work in our investigations into moonlighting and employee disloyalty, or contact us for an initial confidential assessment of the case.