30 Percent Ruling: Court Case Complexities For Expats

Pitfall 1: Gross vs. Net Salary under the 2027 Expat Ruling

A fundamental requirement of the expat ruling is that the highly skilled migrant meets a specific, annually indexed salary criterion. However, disputes frequently arise over how this taxable wage is calculated.

In a recent 2025 ruling by the Court of Appeal in The Hague (Gerechtshof Den Haag), the tax inspector attempted to reject an application by arguing that the employee’s net received salary (after various payroll deductions) was insufficient. The Court firmly rejected this approach and reiterated a crucial legal principle: the salary criterion must always be strictly assessed against the agreed-upon gross salary stipulated in the employment contract.

While this was a victory for the taxpayer, it underscores an essential lesson for HR: your payroll administration must flawlessly categorize and document gross wage components. Conflating net allowances with structural gross salary without unambiguous contractual definitions can trigger complex and costly disputes with the tax authorities.

Pitfall 2: Strict 30% Ruling Conditions and the Continuous Assessment Test

Securing the formal ruling (beschikking) on day one is only half the battle. The Dutch system enforces a continuous assessment test (continue toets). This means the employee must meet the indexed salary threshold during every single calendar year in which the ruling is utilized.

Judges are completely unforgiving when enforcing this requirement. If an expat takes unpaid leave, transitions to part-time hours, or experiences a temporary earnings dip that causes their gross annual salary to drop even slightly below the applicable norm for that specific year, the repercussions are catastrophic. Case law consistently shows that you do not merely lose the tax benefit for the duration of the dip—the ruling is revoked retroactively to January 1st of that calendar year and cannot be reclaimed. HR must maintain proactive monitoring systems, particularly during contractual adjustments, parental leave, or sabbaticals.

Pitfall 3: The Consequences of Garden Leave (Vrijstelling van Werk) on the 30% Ruling

When an employment relationship comes to an end, it is common practice in the Netherlands to place the employee on “garden leave” (vrijstelling van werk) during their notice period. Although regular salary payments continue, the employee is no longer required to perform active duties.

This creates a massive, frequently overlooked fiscal trap. In cases heard before the District Court of Amsterdam (Rechtbank Amsterdam) and the District Court of Zeeland-West-Brabant (Rechtbank Zeeland-West-Brabant), judges ruled explicitly that the 30% ruling terminates on the final day of the payroll period following the month in which the employee ceases actual employment duties.

Even if the employment contract formally continues for another three months and the employer dutifully pays the salary, the Dutch Tax Administration classifies these wages as severance income (loon uit vroegere dienstbetrekking), rather than active employment income. The expat tax advantage lapses immediately, inflicting a severe cut on the employee’s net take-home pay and significantly complicating settlement agreement (vaststellingsovereenkomst) negotiations.

Pitfall 4: Determinable Wages and the Strict 30% Ruling Salary Threshold

What happens if an employee’s base salary falls slightly short of the annual threshold, but they receive a substantial performance bonus at year-end? Does that retroactive boost safeguard their 30% ruling?

Courts evaluate this based on the “fiscal moment of enjoyment” (fiscaal genietingstijdstip). Established jurisprudence dictates that if a bonus or back-pay was explicitly codified in the contract and the employee had a legally enforceable entitlement during that specific year (“determinable, claimable, and collectible” / bepaalbaar, vorderbaar en inbaar), it counts toward that year’s salary threshold. However, if a bonus is purely discretionary or lacks structural contractual guarantees, it cannot be leveraged post-hoc to artificially inflate taxable earnings to meet the strict expat ruling benchmarks.

Pitfall 5: The Burden of Proof for the 150-Kilometer Distance Requirement

One of the most underestimated compliance hazards is substantiating the 150-kilometer distance criterion. Under Dutch tax law, the employee must have resided more than 150 kilometers in a straight line from the Dutch border for at least 16 out of the 24 months preceding their first day of work in the Netherlands.

Employers and employees often mistakenly believe that a simple, self-certified declaration suffices. In practice, the Tax Administration demands rigorous, documentary proof. Without solid corroborating evidence—such as foreign residential lease agreements, mortgage statements, utility records, or official municipal population register extracts—the application will be summarily denied. Gathering these historical records retroactively often proves difficult, routinely resulting in an outright rejection of the facility.

Pitfall 6: Strict Deadlines for Initial Applications and Job Changes

Strategic timing is another critical vulnerability. Many international hires only realize after several months that they are eligible for the ruling. To secure the tax benefit retroactively from day one, the formal application must be submitted within four months of commencing employment. If this deadline is missed, the facility only takes effect on the first day of the following month, forfeiting thousands of euros in accumulated tax relief.

Furthermore, application timing during job transitions is notoriously strict. Crucially, when changing employers, an expat has a strict three-month window between the termination of their previous contract and the inception of the new contract to find a qualified employer. If the employee was placed on garden leave, the start date of the garden leave serves as the trigger point for this three-month period. Once the new position begins, another strict four-month deadline applies to submit the consecutive application. If HR fails to monitor these transitional windows meticulously, a minor administrative delay will result in the permanent, irreversible forfeiture of the expat ruling.