Multi-Activity Compatibility: Legal Implications

Carrying on several activities at the same time is lawful under French law, and that is the guiding principle. The limits therefore do not come from a general prohibition, but from three sets of rules that apply in parallel: maximum working hours, the obligations arising from the employment contract, and special statuses. Conflating these three levels leads people to believe that a combination of activities is prohibited when it is simply poorly organized — or the opposite, which is more dangerous.

The principle: freedom, subject to exceptions

No provision prohibits an employee from carrying on another activity outside working hours. The employee may set up a company, carry on a self-employed activity, or hold a second salaried job.

This freedom has a practical consequence that is often overlooked: an employee has no general obligation to inform their employer of an activity carried on outside working hours. This obligation exists only if a clause in the contract provides for it, or if the situation involves one of the limits described below.

First limit: maximum working hours

This is the strictest limit, and the only one whose breach also engages the employer's liability.

When an employee combines several salaried jobs, the total number of hours worked may not exceed the legal maximums: ten hours per day, forty-eight hours in a week, and an average of forty-four hours over twelve consecutive weeks. These caps are assessed across all employers combined.

An employer who is aware of an irregular combination of jobs and allows it to continue is exposed to sanctions. This is why many employers ask for a signed statement confirming compliance with the maximum working hours: this request is legitimate, even though no information about the nature of the activity is owed.

Combining a salaried job with a self-employed activity does not count toward this cap, since self-employed activity is not counted as working time. The calculation of hours owed under the first job remains governed by the ordinary rules, described in our article on overtime.

Second limit: obligations arising from the contract

Three distinct mechanisms, often confused with one another:

The duty of loyalty exists without any clause. It prohibits the employee from carrying on an activity competing with that of their employer during the term of the contract, and from diverting clients or information. It applies at all times, including during vacation and periods when the contract is suspended.

The exclusivity clause prohibits any other professional activity, even non-competing. Its validity is conditional: it must be indispensable to protecting the company's legitimate interests, justified by the nature of the task, and proportionate to the aim pursued. A blanket exclusivity clause, inserted as a matter of course in every contract, is regularly struck down. It is also unenforceable, for a set period, against an employee who sets up or takes over a business, as well as against part-time employees — for whom it would amount to preventing them from supplementing their income.

The non-compete clause only applies after the contract ends. Its validity requires that it be limited in time and geographic scope, protect legitimate interests, take account of the specifics of the job, and above all include financial compensation. Without compensation, it is void.

The distinction is crucial: a poorly drafted exclusivity clause does not prevent an employee from combining activities during the term of the contract, and a non-compete clause, even if valid, has no effect as long as the contract is ongoing. These provisions fall under the general obligations described in our article on the employer's legal obligations.

Third limit: special statuses

Certain statuses reverse the principle.

Public officials are, in principle, subject to an obligation to exercise their duties exclusively, with regulated exceptions: production of creative works, ancillary activities subject to authorization, temporary combination of activities to set up a business.

Some regulated professions have their own incompatibilities, set by their regulations or code of ethics, independent of labor law.

Combining employment with retirement is governed by specific rules depending on the pension scheme and on whether the pension has been claimed at the full rate or not, with direct consequences on the continued payment of the pension.

Social security and tax consequences

Combining activities creates parallel affiliations. An employee who also carries on a self-employed activity contributes to both schemes, with rules determining which one applies for health insurance and for retirement. Income is declared in its respective categories — wages and salaries on one side, industrial and commercial or non-commercial profits on the other — and is aggregated to determine total taxable income.

Two points of caution consistently arise: health coverage falls under the scheme of the main activity according to specific criteria, and crossing certain revenue thresholds in the self-employed activity changes the applicable social security scheme without prior warning.

Usage scenarios

Employee setting up a self-employed activity. Check whether an exclusivity clause exists, since its temporary unenforceability against business founders applies precisely in this situation. The duty of loyalty, however, applies without any clause: the activity set up must not compete with the employer.

Combining two part-time jobs. The key check is compliance with the maximum working hours across all employers combined. An exclusivity clause in a part-time contract is, in principle, without effect.

Employee carrying on another activity from home. The place of performance changes nothing about the rules, including for an employee working remotely. What matters remains the effective separation of time and compliance with the maximum working hours.

Frequently asked questions

Do you have to inform your employer? Not in principle, unless a contractual clause provides for it. The employer may, however, request a statement confirming compliance with the maximum working hours, which does not inform them of the nature of the activity.

Is an exclusivity clause always valid? No. It must be indispensable to protecting the company's legitimate interests, justified by the nature of the task, and proportionate. It is set aside for a given period for business founders and, in practice, for part-time employees.

Can you work for a competitor? No, during the term of the contract: the duty of loyalty prohibits it without any clause being necessary. After termination, only a valid and compensated non-compete clause can prohibit it.

What are the maximum working hours to comply with? Ten hours per day, forty-eight hours in a week, and an average of forty-four hours over twelve weeks, across all salaried employers combined.

Does a self-employed activity count toward these caps? No, it is not counted as salaried working time. The duty of loyalty and any exclusivity clause, however, continue to apply.

Can a public official combine activities? The principle is exclusive exercise of duties, with regulated exceptions that are often subject to prior authorization.

Key takeaways

Combining activities is free in principle. What frames it comes down to three independent levels, to be checked separately: maximum working hours, which apply across all salaried employers combined; contractual provisions, distinguishing the duty of loyalty which always exists, the exclusivity clause which is only valid if justified, and the non-compete clause which only applies after termination; and special statuses, which sometimes reverse the principle.

The most common mistake is invoking a non-compete clause to prohibit combining activities during the term of the contract. It serves no purpose there. The only basis usable during performance of the contract is the duty of loyalty, and it requires no clause at all.