Dutch tax return 2025: deadline, deductions, and mistakes

When do you need to file your 2025 return?

You have until 1 May 2026 to file your 2025 Dutch income tax return. The filing portal opens on 1 March. If you receive a refund, it is usually paid within about 1 week after the date on the assessment.

Requesting an extension

If you cannot make the 1 May deadline, request an extension before 1 May. In many cases that gives you until 1 September 2026.

What does filing late cost?

If you miss the deadline without an extension, you risk a default penalty of EUR 469. The Belastingdienst can also issue an estimated assessment.

Step by step

1. Get your DigiD ready

You need DigiD to log in to Mijn Belastingdienst.

2. Check the pre-filled return

The Belastingdienst pre-fills many data points, but you should not assume they are complete or correct.

3. Add your deductions

The Belastingdienst does not automatically enter your deductions. You need to add healthcare costs, gifts, paid partner alimony, annuity premiums, and any other relevant deductible items yourself.

Five often-missed deductions

1. Specific healthcare costs

Medication, aids, personal contributions, and some travel costs can be deductible above the applicable threshold.

2. Charitable donations

Ordinary donations are subject to thresholds and limits. Periodic gifts have different rules.

3. Study costs

There is no general income tax deduction for study costs anymore, so do not automatically add them to your 2025 return.

4. Public transport travel deduction

If you travel to work by public transport and pay those costs yourself, you may qualify for a fixed travel deduction. It is not a deduction of the actual public transport costs.

5. Mortgage interest on renovation financing

If renovation financing is linked properly to your home, the interest may be deductible, but it is often forgotten.

When should you outsource?

• You are self-employed - entrepreneur deductions, VAT, and depreciation make things more complex
• You bought or sold a home in 2025 - owner-occupied home rules and home equity reserve issues are error-prone
• You divorced - alimony, home allocation, and tax credits need care
• You have foreign income - cross-border situations are more complex
• You own crypto or investments - valuation and box 3 calculations are often misunderstood

A good tax advisor can pay for itself in situations like these.