How to File Your 2025 Dutch Tax Return in 2026

Tax season is here. If you lived or worked in the Netherlands in 2025, you'll likely need to file an income tax return (aangifte inkomstenbelasting) before May 1st, 2026. Whether you're Dutch or an expat, the process can feel overwhelming — but it doesn't have to be.

This guide walks you through everything you need to know: who must file, what you can deduct, and how to submit your return online. Let's make sure you get every euro you're entitled to.

Who Needs to File a Tax Return?

Not everyone in the Netherlands is required to file. The Belastingdienst (Dutch Tax Authority) will send you a notification if you must file — usually via a letter or message in your Mijn Belastingdienst account.

You must file if:

• You received income from multiple sources (two employers, freelance + employment, etc.)
• You owned a home with a mortgage in 2025
• You had substantial interest (aanmerkelijk belang) in a company (5% or more shares)
• You had savings and investments above €57,000 (threshold for 2025)
• You received income from abroad
• You're self-employed (zzp'er or entrepreneur)
• You applied for the 30% ruling
• You received a specific request from the Belastingdienst

You can file voluntarily if:

• You want to claim deductions (healthcare costs, charitable donations, study costs)
• You paid too much tax and want a refund (belastingteruggave)
• You moved to or from the Netherlands during 2025

Even if you're not required to file, it's often worth it — many people get money back.

Key Deadlines for 2026

• March 1, 2026 — Filing opens; you can submit your 2025 return
• May 1, 2026 — Standard deadline for most people
• September 1, 2026 — Extended deadline if you request it (or use a tax advisor)

If you miss the deadline, you may face penalties or late fees. Request an extension before May 1st if you need more time.

Understanding the Three Boxes

Dutch income tax is divided into three "boxes" (boxen), each taxed differently:

Most people only deal with Box 1. Box 3 is relevant if you have more than €57,000 in assets (after the tax-free allowance). Box 2 applies mainly to entrepreneurs and company shareholders.

Common Deductions You Can Claim

These are the main deductions (aftrekposten) that can reduce your taxable income:

Mortgage Interest (Hypotheekrenteaftrek)
If you own your home and have a mortgage, you can deduct the interest you paid in 2025. This is usually the biggest deduction for homeowners. The Belastingdienst receives this data from your mortgage lender automatically.

Healthcare Costs (Zorgkosten)
Medical expenses above €150 (or 1.65% of your income, whichever is higher) can be deducted. This includes:

• Prescription medications not covered by insurance
• Dental work (implants, orthodontics)
• Travel costs for medical appointments
• Special diets prescribed by a doctor

You'll need receipts and invoices to support your claim.

Charitable Donations (Giften)
Donations to ANBI-registered charities (cultural, religious, or social organizations) are deductible if:

• You donated more than 1% of your income, or at least €60
• The charity is recognized by the Belastingdienst

Keep donation receipts and ANBI numbers handy.

Study Costs (Scholingsuitgaven)
If you paid for professional training or education in 2025, you may deduct costs above €250. This includes tuition, books, and exam fees for courses that improve your professional skills.

Alimony (Alimentatie)
Payments made under a court order or official agreement to an ex-partner or children can be fully deducted.

How to File: Step-by-Step

Filing your return online via Mijn Belastingdienst is the fastest and easiest way. Here's how:

1. Prepare Your Documents

Gather:

• Your DigiD login credentials
• Salary statements (jaaropgaven) from your employer(s)
• Bank statements showing savings and investment balances as of January 1, 2025
• Mortgage interest statement (if applicable)
• Receipts for deductible expenses (healthcare, donations, study costs)

2. Log In to Mijn Belastingdienst

Go to www.belastingdienst.nl and log in with your DigiD. If you don't have DigiD yet, you'll need to apply for one — it can take a few days.

3. Review Pre-Filled Information

The Belastingdienst will have already entered:

• Income from employers (Box 1)
• Mortgage interest (if you own a home)
• Bank account balances (Box 3)
• Pension contributions

Check every line carefully. Employers sometimes make mistakes, and not all income sources are automatically reported.

4. Add Missing Income and Deductions

Manually enter:

• Freelance or side income
• Foreign income
• Healthcare costs
• Donations
• Study expenses

5. Review and Submit

The system will calculate your tax bill or refund automatically. Review the final summary, then click "Versturen" (Submit).

You'll receive a confirmation email and a receipt number. Save this.

6. Receive Your Assessment (Aanslag)

Within 4-8 weeks, you'll receive your official tax assessment (aanslag) showing:

• How much tax you owe, or
• How much you'll get back (belastingteruggave)

Refunds are usually paid within 2-4 weeks. If you owe money, you'll have time to pay — the Belastingdienst will send a payment request.

Special Considerations for Expats

If you moved to or from the Netherlands in 2025, or you have the 30% ruling, a few extra rules apply:

Partial-Year Residents
If you lived in the Netherlands for only part of 2025, you're still required to file a return for the months you were a Dutch tax resident. You may also need to file in your home country — check for tax treaties to avoid double taxation.

30% Ruling
If you have the 30% ruling (a tax advantage for highly skilled migrants), 30% of your gross salary is tax-free. This should already be reflected in your employer's payroll, but double-check your jaaropgave.

You can also choose to be treated as a "partial non-resident" for Box 2 and Box 3, which means you won't pay Dutch tax on worldwide assets — only Dutch assets.

Foreign Income
All worldwide income must be declared, even if it's already taxed abroad. The Netherlands has tax treaties with most countries to prevent double taxation, but you'll need to report the income and claim a credit (verrekening) for foreign taxes paid.

DigiD for Expats
You need a Dutch BSN (burgerservicenummer) and a registered address to get DigiD. If you're new to the Netherlands, apply at your local gemeente as soon as possible.

Common Mistakes to Avoid

1. Forgetting Foreign Income — You must declare all worldwide income, even if taxed elsewhere
2. Missing Deductions — Don't leave money on the table; claim healthcare costs, donations, and study expenses
3. Incorrect Box 3 Assets — Use the balance on January 1, 2025, not December 31
4. Not Requesting an Extension — If you need more time, ask before May 1st
5. Ignoring Pre-Filled Errors — Always verify employer-reported income and bank balances

What Happens After You File?

Once you submit your return:

1. Confirmation — You'll get an instant receipt and confirmation number
2. Processing — The Belastingdienst reviews your return (4-8 weeks)
3. Assessment — You receive your aanslag (official tax bill or refund notice)
4. Payment or Refund — You either pay what you owe or receive your refund automatically

If the Belastingdienst has questions, they'll contact you via Mijn Belastingdienst. Respond quickly to avoid delays.

Need Help?

Filing a Dutch tax return can be complex, especially if you're self-employed, have foreign income, or own property. If you're unsure about any part of the process, consider:

• Using Bowie Tax for step-by-step AI-guided filing
• Hiring a belastingadviseur (tax advisor) for complex situations
• Calling the Belastingdienst helpline: 0800-0543 (free, weekdays 8 AM - 5 PM)

Don't let tax season stress you out. With the right preparation and a little patience, you'll file confidently and keep more money in your pocket.

FAQ

When is the deadline to file my 2025 tax return?
May 1, 2026, for most people. You can request an extension until September 1, 2026, if needed.

Do I have to file if I only worked for one employer?
Not always. If your employer correctly withheld taxes and you have no deductions to claim, filing may be optional. Check Mijn Belastingdienst to see if you're required to file.

How long does it take to get a tax refund?
Usually 2-4 weeks after your return is processed. The Belastingdienst transfers refunds directly to your bank account.

Can I file a tax return if I don't have DigiD?
No. You need DigiD to access Mijn Belastingdienst. Apply for DigiD at your local gemeente if you don't have it yet.

What if I made a mistake on my return?
You can file a correction (herzieningsverzoek) within three years. Log in to Mijn Belastingdienst and submit the corrected information.