Second Job & Side Hustle Rules in Europe 2026

The one rule that crosses every border

Before anything country-specific: the EU Working Time Directive's 48-hour weekly average cap applies across all your jobs combined, not per employer. Two 30-hour jobs equal 60 hours, and that is unlawful even if each contract looks innocent on its own. Your employers do not automatically know about each other, which means the compliance burden sits largely on you: if your combined hours breach the cap, or your second job leaves you too tired to work safely, you — not just your employers — carry the risk. Every section below sits underneath this ceiling.

Exclusivity and loyalty clauses: what your contract probably says

Most European employment contracts contain some version of a loyalty or exclusivity clause: a duty not to compete with your employer, and often a requirement to get written permission before taking other paid work. These clauses are broadly enforceable across Europe — but since August 2022, an EU directive on transparent working conditions has tilted the balance toward workers: in most member states an employer can now only prohibit or restrict a second job with an objective justification, such as health and safety, protection of business confidentiality, or avoiding conflicts of interest. A blanket "no second jobs, no discussion" clause with no justification is increasingly hard to defend. That does not mean you can ignore the clause — it means you can usually ask, and the employer needs a real reason to say no.

Germany: Nebentätigkeit — inform, don't hide

German law treats a second job (Nebentätigkeit) as fundamentally permissible. The standard pattern in German contracts is a notification duty (Anzeigepflicht): you must inform your employer about the side job, and the employer may only prohibit it if there is a legitimate interest — typically impaired performance in the main job, breach of the 48-hour limit, or direct competition.

• Mini-jobs (Minijobs) are the classic German side hustle: low-hours employment with simplified tax and social-security treatment up to a monthly earnings threshold that is adjusted over time — check the current figure before you rely on it, because it moves.
• Working for a direct competitor is the fastest way to get a lawful refusal. Anything adjacent to your employer's business needs explicit written clearance.
• Civil servants (Beamte) face much stricter secondary-employment rules, including prior approval requirements — a different world from private-sector employees.

France: loyalty is strict, exclusivity must be justified

French employees owe their employer an obligation de loyauté — a duty of loyalty that forbids competing activity and misuse of confidential information, even without a written clause. On top of that, many contracts add an exclusivité clause, but French courts require such clauses to be justified by the nature of the work and proportionate — an exclusivity clause imposed on a junior employee with no access to sensitive information will not survive a challenge.

• Non-compete clauses (clause de non-concurrence) are only enforceable if they are limited in time, geography and activity — and crucially, they must come with financial compensation. An unpaid non-compete is void.
• The auto-entrepreneur regime makes side freelancing administratively simple, but you must still check your contract's exclusivity and loyalty terms first — and some employers require a written declaration of the side activity.
• Cumul rules for public-sector workers are far stricter than for the private sector.

Netherlands: nevenwerkzaamheden and the justification test

Dutch contracts routinely include a nevenwerkzaamheden (secondary activities) clause requiring prior permission. Since the Netherlands implemented the EU transparent-working-conditions directive, employers may only refuse permission on objective grounds — safety, confidentiality, conflicts of interest, or working-time limits. In practice this means: ask in writing, state the hours and nature of the side work, and expect approval unless there is a genuine conflict.

• The Netherlands' huge ZZP (self-employed without staff) culture means side freelancing is socially normal — but registering with the Chamber of Commerce (KvK) for work that competes with your employer is exactly the scenario permission clauses are written for.
• Part-time workers should check the meeruren interaction: extra hours at the main employer and a second job both count toward the 48-hour average.

Spain, Italy, Poland and Ireland in brief

• Spain: holding two jobs (pluriempleo) is common and lawful; social-security contributions are coordinated between the two, with combined contribution bases capped. Side freelancing means registering as autónomo, with its own monthly social-security charge — do the maths before you start, because the flat-rate incentives for new autónomos phase out.
• Italy: private-sector employees owe a statutory duty of loyalty (obbligo di fedeltà) — no competing business, no misuse of secrets — even without a written clause. Public employees face strict incompatibility rules. Side partita IVA freelancing is widespread but must not compete with the employer.
• Poland: a second umowa o pracę (employment contract) is straightforward; the popular alternative is a B2B contract on the side. Each employment relationship carries its own working-time accounting, but the 48-hour average still aggregates.
• Ireland: largely contract-driven — read the exclusivity and confidentiality clauses carefully, because Irish statute adds little beyond them. Common-law duties of fidelity apply even where the contract is thin.

Tax: the second income is taxed harder than you expect

A second job does not get a second tax-free allowance. In progressive tax systems — which is all seven of these countries — your combined income pushes you into higher brackets, and the second employer often withholds at a flat or emergency rate that you settle at year-end. Practical consequences:

• Register correctly. In most countries you must tell the second employer (or the tax office) that this is a secondary income so withholding is calculated properly. Germany's Steuerklasse VI for the second job is the classic example: it withholds at the highest rate with no allowances, and you reclaim the difference in your tax return.
• Social security coordination. Under EU Regulation 883/2004, you are generally subject to the social-security system of your country of residence when working in two or more member states — but two jobs in one country usually just means both employers contribute, with combined caps where they exist (Spain) or none (most others).
• File the return. Second incomes almost always trigger a filing obligation even where your main salary alone would not. Our guide to tax returns in Europe for foreign workers walks through the country specifics.

Freelancing on the side

Side freelancing — a few clients, evenings and weekends — is the most popular second income in Europe's tech and creative sectors, and every country has a simplified regime for it: Germany's Kleinunternehmer, France's auto-entrepreneur, the Dutch ZZP registration, Spain's autónomo, Italy's partita IVA in forfettario regime, Poland's jednoosobowa działalność gospodarcza. Two warnings that apply everywhere: first, false self-employment (Scheinselbständigkeit and its cousins) — if your "client" controls your hours and methods like an employer, the authorities can reclassify the relationship and bill both sides for back contributions; second, freelancing for your own employer's competitors without written clearance is the single most common way side hustles end in dismissal. Read our full freelancing and self-employment in Europe guide before you invoice anyone.

How to ask your employer (a practical script)

1. Read your contract first. Find the exact wording: notification duty, permission requirement, or full exclusivity? The wording determines whether you inform or ask.
2. Put it in writing. A short email: the nature of the side work, the expected hours per week, confirmation it does not compete and does not breach the 48-hour average, and a request for written approval.
3. Propose safeguards. Offer to keep the side work outside business hours, to avoid the employer's clients and suppliers, and to revisit the arrangement if your main-job performance dips. Employers approve requests that arrive with solutions attached.
4. Keep the approval. Save the written permission with your contract. Verbal "sure, fine" from a manager evaporates the moment management changes.

Extra caution during probation

Legally your rights during probation are mostly the same, but practically a second job discovered during the probation period reads as divided attention to many managers — and probation dismissal is easy in every European country. The safest sequence is: pass probation, establish strong performance, then raise the side work with the track record behind you. Our guide to probation periods in Europe explains what new hires should know about this vulnerable window.

The European consensus on second jobs is more permissive than most newcomers assume: notify or ask, stay under 48 hours combined, do not compete, pay the tax properly — and get the permission in writing. Do that, and the side hustle funds the life the main job is building.