What happened ?

The Advocate General at the Dutch Supreme Court issued a conclusion on 17 April 2026 in a tax case involving a taxpayer active in real estate who had not filed Dutch income tax and healthcare contribution returns for 2015 to 2017. 

The inspector imposed estimated assessments based on earlier final assessments: EUR 1,000,000 for box 1 income and EUR 10,000,000 for the box 3 tax base, with penalties of 100% and 300%, respectively. 

The AG found that reversal of the burden of proof is administrative, not criminal, but recommended referral because the court did not properly address missing foreign bank information and a possible legitimate expectation created by an announced 50% penalty.

Analysis

The business lesson is not about aggressive tax litigation. It is about what happens when a company or owner loses documentary control.

Once filings, evidence, bank data, ownership records, or financial explanations are missing, the authority may reconstruct reality from outside signals. That reconstruction can be rough, but it is still legally usable.

Many small businesses assume that unclear records create negotiation space. This case shows the opposite: lack of evidence shifts power away from the business.

The tension is practical: informal habits may feel manageable internally, but before the tax authority, they become exposed, especially when communication, files, and prior positions are inconsistent.

Governance

Leadership cannot delegate away fiscal visibility.

If owners, advisers, or family members control assets or accounts without a clear evidence trail, governance becomes dependent on memory and trust. That is not oversight. It is an unmanaged dependence.

Risk

The exposure is financial and procedural.

Missing filings can trigger estimated assessments, reversed proof burdens, high penalties, interest, and years of litigation. The larger risk is loss of narrative control: the authority’s reconstruction overrides the company’s explanation.

Compliance

The ignored duty was basic but decisive: file complete returns and keep accessible evidence for income, assets, accounts, and objections.

A business must also document tax-authority communications, especially penalty notices, because wording can later affect legitimate expectation.

Daily operational takeaway.

Within 72 hours, ensure all tax documents, including filings, bank evidence, assessment notices, and penalty communications, are compiled into a single, accessible, date-ordered file for future reference.

ECLI:NL:PHR:2026:411 Parket bij de Hoge Raad