Case Note about Case C‑20/16 –Bechtel /Le Li

Case Note about Case C‑20/16 –Bechtel with Focused Independent Analysis/Le Li

I. Introduction

This case note analyses the judgment of the Court of Justice in Case C‑20/16, Bechtel, from the perspective of EU tax law and the free movement of workers. The central question is whether Article 45 TFEU precludes German legislation that denies the deductibility of compulsory social‑security contributions paid in another Member State, where comparable domestic contributions would be deductible. Beyond summarising the facts and the Court’s reasoning, this note concentrates on the normative and systematic implications of the judgment for the design of residence‑based personal income taxation in the European Union.

II. Facts and National Law

Mr and Mrs Bechtel were tax resident in Germany and therefore subject to unlimited tax liability under the Einkommensteuergesetz 2002 (EStG). During the tax years 2005 and 2006, Mrs Bechtel pursued employment in France. On that employment, she paid mandatory French pension and health‑insurance contributions.

Under the Germany–France double tax convention, Mrs Bechtel’s French‑source salary was exempt from German income tax. However, Germany applied the so‑called progression clause (Progressionsvorbehalt): although the French income was exempt, it was taken into account to determine the progressive tax rate applicable to the Bechtels’ other taxable income in Germany.

German income tax law allowed residents to deduct compulsory social‑security contributions as income‑related expenses where the underlying employment was carried out in Germany and the contributions were paid into the German system. The Finanzamt Offenburg refused to treat the French contributions in the same way. The only distinguishing factor was the place where the contributions were paid. The Bechtels challenged this treatment, and the Bundesfinanzhof referred questions to the Court of Justice on the compatibility of such legislation with Article 45 TFEU.

III. Judgment and Reasoning of the Court

The Court first confirmed that rules on the deductibility of employment‑related expenses fall within the scope of Article 45 TFEU. They directly affect the net income of cross‑border workers and may therefore deter the exercise of the freedom of movement.

Second, the Court held that a resident worker employed in another Member State is in a situation comparable, for the purposes of deductibility, to a worker employed in the State of residence. Mandatory pension and health‑insurance contributions are intrinsically linked to the earning of employment income, irrespective of the Member State whose social‑security system is involved. From the perspective of ability to pay, there is no relevant difference between contributions paid in Germany and contributions paid in France.

Third, the Court found that denying the deduction of French contributions, while allowing deduction of German contributions, placed cross‑border workers at a structural disadvantage. Such a rule increases the effective tax burden on residents who choose to work in another Member State and therefore constitutes a restriction on the free movement of workers within the meaning of Article 45 TFEU.

As to justification, Germany argued that any disadvantage was neutralised because the French tax system could grant a deduction or flat‑rate allowance for the same contributions. The Court rejected this argument. It reiterated that the residence State bears the primary responsibility to take account of a taxpayer’s personal and family circumstances, in line with the Schumacker doctrine. A Member State cannot rely on potential relief in another Member State to correct disadvantages created by its own legislation. The Court therefore concluded that Article 45 TFEU precludes the contested German rules.

IV. Independent Analysis

The Bechtel judgment is important not because it revolutionises EU tax law, but because it consolidates and clarifies several strands of case law on cross‑border workers and personal taxation. In my view, three aspects are particularly significant.

First, the case strengthens the principle of residence‑based neutrality in personal income taxation. Under the logic of the internal market, the decision of a resident worker to accept employment in another Member State should not lead, as such, to a higher tax burden in the residence State. By focusing on the substantive nature of compulsory contributions, the Court makes clear that what matters is the economic function of the payment, not the geography of the social‑security institution. A contribution that is a mandatory condition for earning employment income must be treated in the same way for tax purposes, whether it is paid in Freiburg or in Strasbourg. This functional approach is coherent with the objective of removing hidden fiscal barriers to mobility.

Second, the judgment confirms and refines the Schumacker line of case law. Earlier cases emphasised that the residence State is generally best placed to reflect the overall ability to pay of a taxpayer, especially in respect of personal and family circumstances. Bechtel extends this logic to mandatory social‑security contributions. If the residence State could systematically refuse to recognise foreign compulsory contributions, it would, in practice, make the level of protection of cross‑border workers dependent on the generosity of the source State. This would fragment the internal market and create a patchwork of protection. The Court rightly rejects this outcome and re‑affirms that primary responsibility lies with the residence State.

Third, the Court’s proportionality analysis sends a clear signal about the limits of the “coherence of the tax system” argument. Germany’s position effectively invited the Court to accept a double‑layered justification: first, that allowing deduction only for domestic contributions protects the coherence of its tax and social‑security system; and second, that any residual disadvantage is mitigated by possible relief in France. Had the Court accepted this reasoning, Member States could routinely shift the burden of protecting EU freedoms to other jurisdictions. By refusing this justification, the Court preserves the autonomy of each Member State’s tax system, but insists that such autonomy must be exercised consistently with Treaty freedoms and cannot be off‑loaded onto neighbouring systems.

From a critical standpoint, one might ask whether the Court could have gone further and articulated a more general principle, namely that all compulsory, employment‑linked contributions must be deductible in the residence State, irrespective of their territorial origin. Such a principle would enhance legal certainty for mobile workers and reduce litigation. However, the Court’s more cautious, incremental approach is characteristic of its case‑by‑case constitutionalisation of direct taxation. Even in this restrained form, Bechtel clearly signals that territorial limitations on deductibility will be closely scrutinised where they disadvantage cross‑border workers.

V. Conclusion

Bechtel is a modest but meaningful step in the development of EU tax law. It confirms that residence‑based personal taxation cannot operate in isolation from the Treaty freedoms. By requiring Germany to treat foreign compulsory contributions in the same way as domestic ones, the Court protects the neutrality of cross‑border employment decisions and reinforces the structural role of Article 45 TFEU in the field of direct taxation. In doing so, it contributes to a more coherent, mobility‑friendly framework for workers within the internal market, without undermining the Member States’ core competence in tax matters.