Secondary employment: a second job or business alongside your Dutch job

Secondary employment: a second job or business alongside your Dutch job

Evening hospitality work, freelance assignments or an online shop can provide income and independence, but may clash with your employment agreement. A contractual prohibition does not settle the issue by itself. Equally, statutory protection for outside work does not make every combination workable without discussion. Identify the exact restriction, the employer's reason and the practical arrangement that might address the problem before you commit to another job or assignment.

An employer needs an objective justification to restrict work for others outside your agreed working hours.

Health, safety, confidentiality and concrete conflicts of interest can matter; a standard prohibition is not decisive by itself.

Notification requirements, working-time rules and confidentiality need separate assessment and practical coordination.

1. Identify the activities covered

Read the exact wording: all paid work, volunteering, competing activities or a requirement to obtain permission? A secondary-employment clause concerns activities during employment; a non-compete may additionally restrict work after departure. Collect your contract, handbook and collective agreement, including documents incorporated by reference. Describe your actual proposal: duties, hours, client, customers and equipment. The statutory rule on work for others outside agreed hours is the starting point. Your own business, sector-specific rules or a public-service role may raise additional questions. Have the clause's practical effect assessed rather than relying on its heading. A colleague's permission or an informal workplace custom does not necessarily describe the terms applying to you.

2. The objective reason must match the risk

Article 7:653a of the Dutch Civil Code makes a restriction on outside employment void unless an objective reason justifies it. Relevant reasons can include health and safety, confidential information and conflicts of interest. The justification need not necessarily have been written into the original clause: an employer may explain it when invoking the restriction. Ask which specific activity creates which problem. A general dislike of second jobs says little about necessity. Separate genuine risks from assumptions about availability. Offer a narrower solution, such as different hours, exclusion of specified customers or separate equipment and files. Assess the explanation and proposed restriction together rather than treating the mere presence or absence of standard wording as conclusive.

3. Count work and rest across jobs

Combining jobs can affect working-time and rest requirements. Do not consider only one employer's roster. Night work, on-call duties and consecutive working days need particular attention. Prepare a weekly overview including both jobs, travel, rest and expected busy periods. Travel is not always legally working time but can still affect fatigue and safe performance. Give each employer the information needed to meet relevant obligations without unnecessarily disclosing your entire private life or turnover. An employer cannot simply claim every hour outside your contract as availability. Conversely, hiding a second roster is unhelpful where it creates a concrete safety issue. Discuss practical scheduling before accepting incompatible shifts rather than relying on a later dispute to resolve them.

4. Request a specific written arrangement

Explain the activity, realistic time commitment and measures preventing clashes. State that you will not use your employer's customer files, equipment or paid time. Request a concrete response and reasons for any refusal. If permission is given, record its client, duration and scope, plus when further discussion is required. Expanded hours or changed duties may affect the original arrangement. Keep correspondence and confirm conditions discussed orally. You do not automatically need to sign a broader non-compete in return for permission: have additional restrictions assessed first. The objective is an arrangement you can actually follow, with a clear way to discuss changes, rather than a vague assurance that the employer probably will not object.

5. Respond carefully to refusal or a penalty

Ask for the factual basis of a refusal and address each stated risk. Include your proposal for a narrower arrangement. Where a serious penalty or dismissal risk exists, do not start on the assumption that the employer will lose any challenge. Obtain timely assessment of the clause, justification and sanction in your circumstances. For a penalty claim, ask which act, date and contractual provision the employer relies on. Do not concede a disputed legal breach merely while acknowledging the underlying facts. An orderly file helps focus discussion on actual activities and interests. Keep commercial commitments conditional where appropriate until you understand whether you can perform them within the existing arrangement.

Example: negotiating a suitable boundary

You work in a finance department and want to provide bookkeeping services two evenings a week. Your employer worries you will serve its customers. Discuss excluding clearly identified customers and using separate systems rather than assuming either a total prohibition or unrestricted permission is the only option.

6. Keep other obligations and departure separate

Permission for outside work does not remove confidentiality, business-information protection or duties of good employment conduct. Keep customer data and access credentials separate. Check whether UWV or another benefit administrator requires reports of income or activities: employer permission does not replace those obligations. When employment ends, reassess which restrictions survive. The end of a secondary-work prohibition does not automatically remove a non-solicitation or non-compete clause. A settlement agreement may introduce new restrictions. Record which activity can continue and under what conditions so that your business or second job does not become blocked at departure. Check the final documents rather than assuming the earlier permission overrides every later agreement.

Collect the applicable clause, collective agreement and handbook versions.

Describe duties, clients, hours and potential overlap.

Ask which objective reason makes a restriction necessary.

Propose clear boundaries and record permission in writing.

Check working time, confidentiality and benefit-reporting separately.

Must the objective reason already appear in my contract?

Not necessarily for this clause. The employer can give an objective reason when invoking it. That reason must still fit the restriction and your activity. Ask for a written explanation and assess the actual risk.

Can my employer require notification?

A notification obligation is not automatically the same as a valid total prohibition. Its content, necessity and application matter. Supply relevant information and have an excessively broad requirement assessed before disregarding it.

Does permission cover my next assignment?

That depends on its agreed scope. An exemption for one client or limited hours may not cover your new proposal. Discuss material changes and obtain written confirmation of any extension before relying on it.

Can I help my own customers during paid working time?

Protection for secondary employment creates no general entitlement to use agreed working hours, files or equipment for your own assignments. Separate the activities and check conflicts of interest even where the second job itself is permitted.

Sources and editorial notes
Sources current as of: October 18, 2026
1. Statutory text: introduction of Civil Code article 7:653a on outside work
Publisher: Officiële bekendmakingen
https://zoek.officielebekendmakingen.nl/stb-2022-277.html
2. Ondernemersplein: running a business alongside employment
Publisher: Ondernemersplein · Overheid.nl
https://ondernemersplein.overheid.nl/bedrijf-starten/startsituaties/parttime-ondernemen-bedrijf-starten-naast-een-vaste-baan/
3. Arboportaal: working time and rest
Publisher: Arboportaal · Ministerie van SZW
https://www.arboportaal.nl/onderwerpen/arbowet--en--regelgeving/werk--en-rusttijden-arbeidstijdenwet
The source publications are in Dutch. All language editions cover Dutch law.