I started my first side hustle in the Netherlands without really understanding what I was doing from a tax perspective. I was doing some freelance writing on the side of my main job, getting paid into my regular bank account, and telling myself I would “sort out the tax side later.” A Dutch accountant friend eventually sat me down and explained, very patiently, that I was operating a commercial activity without being registered with the KvK, which was not a good position to be in.
It did not need to be complicated. Once I understood the framework, it was fine. But the framework matters — and for expats specifically, there are a few layers on top of the standard Dutch rules that are worth understanding before you start earning.
This guide covers the legal framework, the tax rules, the best side hustle options for expats in the Netherlands, and how passive income from ETFs and other investments fits into the picture.
The Legal Framework: Bijverdienste vs ZZP
There are two distinct categories of extra income in the Netherlands, and they are treated very differently.
Bijverdienste: Small Supplementary Earnings
Bijverdienste (literally: earning on the side) refers to small, occasional supplementary income that does not constitute a business. Examples: selling items on Marktplaats, a one-off paid favour for a friend, occasional babysitting, small ad-hoc online tasks.
This income is still technically taxable — you declare it as “overige inkomsten” in your tax return — but it does not require KvK registration, VAT administration, or business bookkeeping. The Belastingdienst accepts that not every small cash transaction constitutes a business.
The grey zone: There is no hard euro threshold below which income is automatically bijverdienste. What matters is whether your activity is commercial (you offer services to customers, you repeat the activity, you intend to profit). Selling your old furniture once is bijverdienste. Consistently listing items for resale you bought wholesale is a business.
ZZP: Registered Self-Employment
Once your side income becomes regular, service-oriented, or commercially structured, you need to register as a ZZP (zelfstandige zonder personeel — self-employed sole trader) at the KvK. The one-time KvK registration costs EUR 50.
After registration:
- You receive a KvK number and BTW (VAT) number
- You are expected to issue invoices to clients
- You must file quarterly or annual BTW returns if your turnover exceeds the kleineondernemersregeling (KOR) threshold
- Your profit is declared in your annual income tax return under Box 1
The KOR (Kleineondernemersregeling — Small Business Exemption): If your annual turnover is below EUR 20,000, you can opt into the KOR, which means you do not charge or reclaim VAT. This simplifies administration significantly for small side hustles. You apply for the KOR through the Belastingdienst after receiving your KvK number.
Tax Rules: What You Actually Pay
Box 1 Tax Rates (2026)
Side hustle profit is added to your total Box 1 income and taxed at:
| Income Bracket | Tax Rate (2026 approximate) |
|---|---|
| EUR 0 – EUR 38,441 | 36.97% |
| EUR 38,441+ | 49.5% |
For most expats with a full-time job in the Netherlands, their employment income already pushes them into the 49.5% bracket. This means each euro of side hustle profit is taxed at 49.5% — worth knowing before you assume a side hustle will significantly boost your net income.
Example: EUR 5,000 of freelance profit on top of a salary of EUR 60,000 = EUR 5,000 × 49.5% = EUR 2,475 tax owed. Net additional income: EUR 2,525.
This does not mean side hustles are not worth it — but it does mean you should factor the real tax rate into your income planning.
Business Deductions (If You Qualify as Ondernemer)
If you work at least 1,225 hours per year on your business (the “urencriterium”), you qualify as an “ondernemer voor de inkomstenbelasting” and access:
- Zelfstandigenaftrek: approximately EUR 3,750 deduction from taxable profit (2026; this has been declining annually as the Dutch government phases it down)
- MKB-winstvrijstelling: 14% of profit is exempt from tax
- Startersaftrek: additional EUR 2,123 deduction in your first three qualifying years
For a full-time employee running a small side hustle, reaching 1,225 hours per year on the side business is genuinely difficult. If your side hustle generates meaningful income but you are under the hour threshold, you declare the profit as “overige werkzaamheden” (other activities) without these deductions.
Expenses You Can Deduct
Whether or not you qualify as an ondernemer, you can deduct legitimate business expenses from your side hustle income:
- Equipment: laptop, camera, tools (if used for the business)
- Software: subscriptions used for work
- Marketing: website hosting, business cards, advertising
- Travel: mileage to clients at EUR 0.23 per km (2026)
- Workspace: home office deduction (limited; strict conditions apply)
- Professional development: courses, books, conferences related to the business
Keep receipts. The Belastingdienst can audit up to 5 years back.
The 30% Ruling and Side Hustles
I cannot stress this enough: the 30% ruling only applies to your main employment income from the sponsoring employer. Side hustle income is taxed in full under Box 1, without the 30% reduction.
If you earn EUR 10,000 from freelancing while receiving the 30% ruling, those EUR 10,000 are taxed at 49.5% (assuming your main salary already pushes you into the top bracket). Plan accordingly.
Residence Permit Restrictions
This section is critical for non-EU expats.
If your right to work in the Netherlands is tied to a specific employer — which is the case for the kennismigrant (highly skilled migrant) permit — your permit authorises you to work for that specific employer. It does not automatically authorise additional employment or self-employment.
Working on the side without the correct authorisation can jeopardise your visa status and could, in serious cases, affect your residence permit.
What to do: Check your residence permit conditions. If you want to do regular paid work outside your main employment, or register as a ZZP:
- Contact your employer’s HR or immigration advisor
- Consult the IND (Immigration and Naturalisation Service) directly, or use a registered immigration advisor
- Some highly skilled migrants do register as ZZP alongside their main employment — this is possible but requires care and potentially an IND notification
EU citizens and those with a Dutch permanent residence permit (verblijfsvergunning voor onbepaalde tijd) or settled status do not have this restriction. If you have questions about your specific permit type, read my guide to the highly skilled migrant visa.
The Best Side Hustle Options for Expats
These are the side hustles I have seen work best for expats in the Netherlands — taking into account language requirements, practical feasibility alongside a full-time job, and earnings potential.
1. Freelance Work in Your Professional Field
The most obvious and usually the most lucrative. If you are a software developer, designer, consultant, marketer, translator, or financial professional, there is a market for your skills in the Netherlands on a freelance basis.
Platform starting points: LinkedIn (direct outreach and job posting), Malt (European freelance marketplace), Toptal (for high-end tech and finance professionals), Upwork (more global/lower price-point), and Jellow.nl (Dutch-market focused freelance platform).
Rates: Freelance day rates for skilled professionals in the Netherlands typically range from EUR 300–900 per day depending on seniority and field. Tech and finance command the highest rates.
Language requirement: Low for most professional services — the Dutch tech, finance, and consulting ecosystem operates largely in English at the professional level.
2. English Language Tutoring and Teaching
Demand for English language tutoring is consistent in the Netherlands. There are three main markets:
- Business English for Dutch professionals: higher rates (EUR 50–80/hour), often via companies or language schools
- Children’s English tutoring: accessible for expats from English-speaking countries, often found through school networks
- IELTS/TOEFL preparation: structured test preparation with a premium market
Platforms: Preply, iTalki, Superprof, and direct tutoring through Marktplaats or local Facebook groups. For business English, approaching corporate language training companies (many operate in Amsterdam, The Hague, and Eindhoven) directly is effective.
3. Content Creation: Writing, Editing, Translation
If you are fluent in English plus another language, translation is consistently in demand. The Netherlands has a large international business sector producing content that needs translation into English and vice versa.
- Freelance writing: English-language content, copywriting, journalism
- Editing and proofreading: English editing is in demand from Dutch academics, researchers, and businesses
- Subtitling and transcription: specialist services with good platforms (Ooona, Verbit, and others)
- Translation (if you have professional language pairs)
Rates for professional translation: EUR 0.08–0.15 per word. For English editing of academic papers: EUR 15–30 per 1,000 words.
4. Digital Products and Online Courses
Creating a digital product — an online course, an ebook, a template pack, a design asset — takes significant upfront time but can generate recurring income with no additional time once built. This is the category that genuinely approaches passive income in the Box 1 sense.
For expats specifically: there is an underserved market for practical guides, courses, and resources about expat life in the Netherlands. Tax guides, Dutch language learning materials, relocation checklists, Dutch workplace culture courses.
Platforms: Teachable, Gumroad, Notion (for digital templates), or your own website via Stripe.
5. Selling Physical Goods (Marktplaats and Beyond)
Marktplaats is the dominant Dutch second-hand marketplace. Flipping second-hand goods — buying low at thrift stores, garage sales, or Vinted and reselling at a profit — is a side hustle that requires no Dutch language skills and minimal upfront investment.
Sustainable and vintage clothing, electronics, furniture, and art all have active buyer communities on Marktplaats. If you develop a consistent buying and reselling operation, this crosses into bijverdienste territory and should be declared.
6. Photography and Videography
If you have photography skills, the Netherlands has a strong market for:
- Event photography (weddings, corporate events, birthdays)
- Stock photography (Dutch landscapes, architecture, lifestyle — well-represented on Shutterstock and Getty)
- Social media content creation for Dutch businesses
- Real estate photography
Rates for event photography: EUR 500–1,500 per event for experienced photographers.
7. Property Room Rental (Kamerverhuur)
If you own or have a long-term rental with the right to sublet, renting out a spare room can generate EUR 400–800 per month in major Dutch cities. As described in the FAQ, the first approximately EUR 5,998 in room rental income is exempt from tax under the kamerverhuurvrijstelling.
Important caveat: Check your rental contract carefully. Many rental contracts in the Netherlands prohibit subletting. Violating this can result in eviction. If you own your home with a mortgage, check your mortgage terms.
Passive Income in the Netherlands: What Actually Works
True passive income — money that arrives without ongoing active effort — is limited in any country. But there are a few approaches that come close.
ETFs and Index Funds (Box 3)
Investing in globally diversified ETFs through a platform like DeGiro is the most tax-efficient passive income approach for most expats in the Netherlands. Key points:
- Returns are taxed under Box 3 (wealth tax on a deemed return), not Box 1 (income tax on actual gains)
- The Box 3 tax rate (36%) applied to a deemed return (~5.88% on investments) is far lower than the 49.5% income tax you would pay on active income at higher salary levels
- You do not pay tax on dividends or capital gains directly — only on portfolio value on 1 January
- The first approximately EUR 57,000 of net Box 3 wealth per person is exempt from tax
For an expat earning EUR 70,000 and paying 49.5% on active income, building a passive portfolio in Box 3 is considerably more tax-efficient per additional euro than earning the same amount from a side job.
Starting point: Read my full guide to investing as an expat in the Netherlands and my DeGiro review for expats.
Dividends from Dutch or International Stocks
Dividend income from shares is treated under Box 3 — the shares are part of your Box 3 portfolio, and the dividend you receive does not create a separate income event for Box 3 purposes. Dutch dividend withholding tax (dividendbelasting, 15%) is withheld at source and can be credited against your overall Dutch tax bill.
This is a material difference from the UK, US, and many other countries where dividend income is separately taxed as income.
Property Rental (Box 1 or Box 3 Depending on Structure)
Rental income from property you actively manage is generally taxed as Box 1 income in the Netherlands. However, property held more passively (where the rental is managed by an agent and you do little active management) may qualify for Box 3 treatment, which can be more tax-efficient.
Dutch property taxation is complex, and the distinction between Box 1 and Box 3 for property income is fact-specific. If you own investment property in the Netherlands, a tax advisor is essential.
Peer-to-Peer Lending and Savings Interest
Interest from savings accounts and peer-to-peer lending is Box 3 income. Given the Box 3 deemed return system, the tax treatment is the same as for investments — your lending portfolio value is assessed on 1 January and taxed on a deemed return basis, not on the actual interest you earn.
For P2P lending platforms: Bondora, Mintos, and Twino are used by Dutch and international investors. Note that P2P lending carries meaningful credit risk and most platforms are not covered by deposit guarantees.
Practical How-To: Setting Up as a ZZP in the Netherlands
If your side hustle reaches the point of requiring KvK registration, here is the process:
Register with the KvK: Go to kvk.nl and complete the online pre-registration, then book an in-person appointment at a KvK office (most major cities have one). Bring your passport and BSN. Cost: EUR 50. You receive your KvK number immediately and your BTW number within 1–2 weeks by post.
Apply for the KOR if applicable: If your annual turnover will be below EUR 20,000, apply for the kleineondernemersregeling at belastingdienst.nl. This exempts you from charging and filing VAT, dramatically simplifying your administration.
Set up invoicing: Use a simple invoicing tool — Moneybird (Dutch, popular with ZZP), Bonsai, Wave (free), or even a Word template. Issue numbered invoices for every payment you receive.
Open a business bank account (optional but recommended): Keeping your business income separate from personal finances makes bookkeeping vastly easier. Bunq, KNAB, and Handelsbanken all offer affordable ZZP accounts.
Keep records: Every invoice, every expense receipt. The Belastingdienst can audit 5 years back.
File your income tax return: Your annual aangifte includes a profit section for your business income. Most ZZP accountants charge EUR 150–300 per year to handle this. Tools like Moneybird and Boekhoudgemak can generate the figures you need.
Read my full KvK registration guide for step-by-step details, and my guide to tax for freelancers and ZZP for the full tax picture.
Common Mistakes to Avoid
1. Not Checking Your Employment Contract
Many Dutch employment contracts contain clauses restricting secondary work. Ignoring this does not make it go away — it creates a contractual problem with your employer on top of any tax issues.
2. Assuming Side Income Is Tax-Free Under the 30% Ruling
It is not. The 30% ruling covers your main employment income only. Side hustle income is taxed normally.
3. Mixing Personal and Business Finances
Depositing client payments into your personal account alongside your salary creates a bookkeeping nightmare when tax return time arrives. Separate accounts save hours of work and reduce the chance of errors.
4. Not Registering When You Should
Operating commercially without KvK registration is tax evasion. The threshold is not a specific euro amount but a question of commercial intent and regularity. If you are genuinely running a business, register.
5. Ignoring Residence Permit Conditions
For non-EU expats, this is the most serious potential mistake. Unauthorised work can affect your permit and future applications. Always verify your conditions before starting any paid activity outside your main employment.
Frequently Asked Questions
Can I do freelance work on the side while employed in the Netherlands?
In most cases yes, but check your employment contract for a secondary activities clause (nevenwerkzaamheden), verify your residence permit allows it, and register with the KvK if the work is regular and commercial.
Do I need to register with the KvK for a side hustle?
If your activity is regular, commercial, and service-oriented, yes. Occasional small sales or one-off work may qualify as bijverdienste and not require registration, but when in doubt, register — the cost is EUR 50 and it keeps you compliant.
How is side hustle income taxed in the Netherlands?
Under Box 1 as business income or overige werkzaamheden. Added to your salary, most expats pay 49.5% on side hustle profit. Business deductions (zelfstandigenaftrek, MKB-winstvrijstelling) are available only if you meet the 1,225-hour criterion.
How does a side hustle affect my 30% ruling?
The 30% ruling does not apply to side hustle or self-employment income. That income is taxed in full under Box 1.
What is the most tax-efficient passive income for expats in the Netherlands?
Building an ETF portfolio taxed under Box 3 is the most tax-efficient approach for most expats. Box 3 tax is substantially lower than Box 1 income tax at higher income levels, and you pay tax only on a deemed return rather than on actual gains or dividends.
Can I rent out a room in my Dutch home tax-free?
Yes, up to approximately EUR 5,998 per year in rental income is exempt under the kamerverhuurvrijstelling, provided you also live in the property. Check that your rental contract or mortgage allows subletting.
Related reading: KvK Registration Guide for Expats | Tax for Freelancers and ZZP in the Netherlands | Investing in the Netherlands as an Expat | 30% Ruling Eligibility Guide | DeGiro Review for Expats | Dutch Employment Contract Explained | Best Accounting Software for Freelancers Netherlands | Dutch Business Bank Account for ZZP
Frequently Asked Questions
Can I do freelance work on the side while employed in the Netherlands?
In most cases, yes — but you need to check three things first. First, your employment contract: many Dutch employment contracts contain a nevenwerkzaamheden clause (secondary activities clause) that requires you to notify or obtain permission from your employer before doing paid work outside your job. Check your contract. Second, your residence permit: if your right to work in the Netherlands is tied to a specific employer or role (common with the highly skilled migrant permit), additional employment or self-employment may require a separate work authorisation or amendment to your permit. Third, if you plan to earn regularly from freelance work, you need to register with the KvK (Chamber of Commerce) and declare the income on your tax return.
Do I need to register with KvK (Chamber of Commerce) for a side hustle in the Netherlands?
It depends on the regularity and commercial nature of your activities. The Belastingdienst uses criteria including frequency, intent to profit, and whether you approach your work in a business-like manner. Occasional small amounts (e.g. selling second-hand items, a one-off translation) are unlikely to require registration. Regular freelance work, offering services consistently, or earning a meaningful supplementary income almost always requires KvK registration. Registration costs EUR 50 as a one-time fee. Once registered, you are a ZZP (zelfstandige zonder personeel — self-employed without staff), which has its own tax obligations. When in doubt, registering is safer than not — operating commercially without registering is considered tax evasion.
How is side hustle income taxed in the Netherlands?
Side hustle income is generally taxed as business income under Box 1 (income from work and home). You add it to your total Box 1 income (salary plus business income), which is then taxed at progressive rates: 36.97% up to approximately EUR 38,000, and 49.5% above that. However, if you qualify as a 'ondernemer voor de inkomstenbelasting' (entrepreneur for income tax purposes, not just a ZZP registrant), you may access significant deductions including the zelfstandigenaftrek (self-employment deduction, approximately EUR 3,750 in 2026) and the MKB-winstvrijstelling (14% profit exemption). Qualifying for these deductions requires meeting the 'hour criterion' — working at least 1,225 hours per year on your business. For most expats with a full-time job and a small side hustle, this threshold is unlikely to be met, and you declare the income simply as supplementary earnings (overige werkzaamheden) without the deductions.
How does a side hustle affect my 30% ruling?
The 30% ruling applies to your employment income from the employer who sponsors it. It does not automatically extend to self-employment income or side hustle earnings. If you earn additional income from freelance work or a side business while receiving the 30% ruling, that additional income is taxed normally under Box 1 without the 30% reduction. Furthermore, if you leave your sponsored employment, your 30% ruling expires and cannot be transferred to a self-employment arrangement (though there is a 3-month transition window if you move to a new qualifying employer). Side hustle income should be declared separately from your main employment income in your tax return.
What is the difference between Box 1 and Box 3 for passive income in the Netherlands?
This is the most important tax distinction for passive income. Box 1 covers income from active work — employment, freelancing, rental income from properties you actively manage, and certain other recurring income streams. Box 3 covers returns on your savings and investments — it is a wealth tax, not an income tax. Dividend income and capital gains from shares and ETFs fall into Box 3 (taxed via the deemed return system on your portfolio value on 1 January). Rental income from property is usually Box 1 if you actively manage the property, or Box 3 if the property is a passive investment. The key distinction: Box 3 may be more tax-efficient for truly passive returns (you pay 36% on a deemed 5.88% return rather than up to 49.5% on actual income), while Box 1 is unavoidable for active income streams.
Can I rent out a room in my Dutch home for income?
Yes. Renting out a room in your primary residence (where you also live) qualifies for the kamerverhuurvrijstelling — a rental income exemption. If the rental income is below EUR 5,998 per year (2026 approximate; check the Belastingdienst for the current threshold), it is fully exempt from tax and does not need to be declared. Above that threshold, the excess is taxable. This applies to room rental, not to renting your entire home while you are away (which is subject to different rules and often prohibited by your rental contract or mortgage terms). Platforms like Airbnb publish Dutch tax guides on their websites that are worth reading if you plan to use them.
