Andreu Jimenez
Having a Second Job in the Netherlands: Legal Limits and the Tax Trap
You arrive in the Netherlands with a clear and ambitious goal: to save as much as possible. You land your first job, finish your shift at 15:00 and suddenly think: “I have half a day left. Why not look for a second job and earn double?” .
Energy and ambition are good, but in the Netherlands the tax and employment system doesn't forgive mistakes. Holding multiple jobs (having two or more contracts at the same time) is 100% legal , but if you don't know the rules of the game, you will end up working 60 hours a week so that the tax office can keep half of your effort.
In this guide we explain with complete transparency how having a second job works in the Netherlands, the legal limits you cannot cross and, most importantly, how to avoid the tax trap.
La Gran Trampa Fiscal: El «Loonheffingskorting»
This is the number one reason why many people regret having two jobs in the Netherlands.
As we already explained in our guide on [How to understand your Dutch payslip], the Loonheffingskorting is a tax credit. It is a discount the government gives you on your taxes so that you receive more net money each month.
🚨 THE GOLDEN RULE: By law, you can ONLY apply this discount to ONE job at a time.
What happens if you apply it to both jobs?
Imagina que marcas la casilla del «Sí» al descuento fiscal en tu empleo de la mañana y también en el de la tarde. Durante todo el año, cobrarás un sueldo neto altísimo en ambos sitios. Pensarás que has engañado al sistema.
However, when spring comes and you have to file your Tax Return ( Aangifte Inkomstenbelasting ), the Belastingdienst (the Dutch tax office) will cross-check the data. They will see that you have illegally benefited from the discount twice and will demand that you pay all that money back in one go . We are talking about thousands of euros.
The Right Strategy
If you decide to have two jobs, you must apply the Loonheffingskorting only at the job where you earn the most money (your main source of income). At the second job, you must explicitly tell Human Resources that you do NOT want the discount applied.
The result? A lot of tax will be withheld from your second salary (sometimes between 40% and 50%). You will earn less per hour than you expected, but it is the only legal way to avoid ending up in debt to the government.
The Legal Limit: How many hours can you work in the Netherlands ?
You are not a machine and Dutch law knows it. The Arbeidstijdenwet (Working Hours Act) is very strict about rest periods to prevent workplace accidents caused by exhaustion.
If you add up the hours of all your jobs together , you cannot exceed these limits:
The Absolute Maximum: You cannot work more than 60 hours in a single week .
The Sustainable Average: You can't keep up that pace forever. Over a period of 16 weeks, the average number of hours worked cannot exceed 48 hours per week .
Important: Monitoring these hours is your responsibility. If the Labour Inspectorate (SZW) finds you are exceeding the limits, your employers will receive very heavy fines and you will most likely be dismissed for breach of contract.
Do I have to tell my employer that I have another job?
Yes, absolutely. Transparency is key in Dutch work culture.
Both by law and under most collective agreements (CAO) for agencies and companies, you are obliged to inform your main employer that you are going to carry out another paid activity.
Why?
Monitoring hours: They need to know how many hours you work elsewhere to make sure that, when added to theirs, you don't break the Working Hours Act.
Conflict of interest: You can't work for a direct competitor or carry out activities that harm your main employer.
Health and Safety: If you arrive at your main job exhausted from your second job and cause an accident (for example, while driving a forklift), the legal problem is enormous.
The Smart Alternative: Make the most of one job
Given the tax burden and the logistical fatigue of moving between two different companies, with two bosses and two schedules, the logical question is: Is holding multiple jobs in the Netherlands really worth it?
As strategic advisers, our view is clear: In most cases for international workers, NO.
Instead of spreading your energy thin, the most profitable and safest strategy is to look for one solid full-time job with good conditions.
El poder de los «Toeslagen» y las Horas Extra
Look for job offers that allow overtime ( Overwerk ), which is usually paid at 125% or 130%. Or better still, look for positions with rotating, night or weekend shifts. In the Netherlands, working those hours comes with very high pay supplements ( Toeslagen ) that can reach 150% or 200% of your base salary.
You will work fewer total hours in the week, save on commuting, avoid problems with the tax office and your net earnings will be much higher.
Frequently Asked Questions (FAQ) about having multiple jobs in the Netherlands
Can I have a permanent job and be self-employed (ZZP) at the same time?
Sí. Muchos profesionales combinan su contrato por cuenta ajena con trabajos «freelance» en sus horas libres (diseño, reparto, clases particulares). Recuerda que esos ingresos extra como autónomo deben declararse anualmente y pagarán los impuestos correspondientes.
If I have two jobs, do I have to pay for two health insurance policies?
No. Mandatory health insurance ( Zorgverzekering ) is personal. You pay it once a month, regardless of whether you have one job, three or none.
What happens if I get sick while having two jobs?
The sickness protocol ( Ziektewet ) applies to each contract. If you can't work, you will have to report and manage your sick leave at both companies separately, and attend check-ups with each company's occupational doctor ( Arbo-arts ).
Focus on one quality opportunity
Having two jobs in the Netherlands is possible, but it is a bureaucratic and tax obstacle course that often isn't worth the effort.
If your goal is to earn well and have stability working in the Netherlands without going crazy over taxes, the key is choosing well from the start. Are you looking for a full-time job, with organised accommodation, transport and the chance to work good hours?
Forget about looking for two mediocre jobs. Check our Job Offers in the Netherlands and focus on an opportunity that is 100% worth it.
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