The Dutch tax season for the 2025 tax year officially opens on 1 March 2026. Around this time, many taxpayers receive an income tax invitation letter from the Dutch tax authorities. If you receive such a letter, you are legally required to submit a Dutch income tax return, even if you believe you have no income to report.
An invitation letter is not optional. It is a formal notice that creates a statutory filing obligation. Ignoring the letter or submitting the return late can result in tax interest, administrative penalties and further enforcement measures.
Mandatory filing even without an invitation
Not receiving an invitation does not automatically mean that you are not required to file. Under Dutch tax law, you must submit a return if the amount of income tax payable exceeds the legal assessment threshold.
For the 2025 tax year, the assessment boundary is 57 euro. If the net amount of income tax due exceeds this threshold, you are legally obliged to file a return, even without an invitation letter.
This is particularly relevant for individuals with multiple sources of income, foreign income or box 3 assets. Dutch tax residents are generally taxable on their worldwide income and assets. Foreign bank accounts, investment portfolios and other international holdings may therefore need to be reported in your Dutch income tax return.
What is different in 2025 for expats
Recent legislative changes have made the 2025 Dutch income tax return more complex for expats.
One of the key benefits of the 30 percent ruling (Expat Ruling) was the possibility to opt for partial non resident tax status. As of 2025, this status has been abolished for new applications, with transitional rules applying until 1 January 2027 for existing cases. In practice, more expats will now be treated as full Dutch tax residents. As a result, income from savings and investments (box 3) becomes taxable in the Netherlands. If you hold significant assets, this may affect your tax position.
Another important development concerns the way of taxation in box 3. Following the Supreme Court rulings and the introduction of the statutory counter evidence scheme for box 3, taxpayers can report their actual return on savings and investments if this return is lower than the deemed return calculated under the standard method. This can reduce box 3 taxation, but the calculation of actual return is complex and requires detailed documentation of income, asset values and transactions throughout the year.
For many expats, these changes increase both the compliance burden and potential tax exposure.
Professional assistance with your 2025 Dutch income tax return
The 2025 tax year brings additional complexity, particularly for expats and individuals with international assets. If you are required to file and fail to do so on time, or submit an incorrect return, the Dutch tax authorities may impose tax interest and penalties.
Determining whether you are required to file, how the assessment threshold applies to your situation, and how the new box 3 rules impact your assets requires specialist knowledge and careful analysis.
At TACS Solutions, we specialise in Dutch income tax returns for expats. We assist with invitation letters, mandatory filing assessments, 30 percent ruling implications, and complex box 3 calculations under current legislation. Our approach ensures that your tax position is reviewed thoroughly, reported correctly, and aligned with Dutch tax law.
If you have received an invitation letter or are unsure whether you are required to file, contact us for professional guidance and preparation of your 2025 Dutch income tax return.