When does a national direct-tax rule breach EU free-movement law?

Short answer

Member States largely retain power over direct-tax rates, bases, residence, deductions and enforcement. But they must exercise that power consistently with EU law. A tax rule can breach a Treaty freedom when it makes a genuine cross-border activity less attractive than a comparable domestic activity—for example by denying a deduction, imposing an exit charge immediately, withholding at a higher burden, or withholding a personal allowance.

The legal analysis usually has four stages:

1. identify the Treaty freedom engaged and a real cross-border situation;
2. determine whether the rule discriminates or otherwise restricts that freedom;
3. compare situations in light of the tax rule's purpose; and
4. assess whether an accepted justification is pursued consistently and proportionately.

Protecting the balanced allocation of taxing powers, preventing double use of losses, maintaining fiscal cohesion, combating wholly artificial arrangements and enabling effective supervision can justify restrictions. Revenue loss, administrative convenience or a general presumption that cross-border conduct is abusive normally cannot. The measure must not go beyond what is necessary.

Tax autonomy is the starting point, not the conclusion

The TFEU does not generally harmonise corporate or personal income tax. Member States decide whom and what to tax, subject to treaties, EU secondary legislation and the Treaty freedoms. The Court of Justice's recurring formulation is:

Although direct taxation falls within Member State competence, they must exercise that competence consistently with EU law. — Cadbury Schweppes, C-196/04, paragraph 40

A rule does not escape review because it is labelled residence, source, allocation, anti-avoidance or collection. Equally, EU law does not require every cross-border tax difference to disappear. Disadvantages can result from two Member States exercising parallel taxing powers or from disparities between unharmonised systems, without either state discriminating.

The task is to isolate the disadvantage caused by the challenged state's rule and compare it with the relevant domestic treatment.

Choose the correct freedom

The applicable freedom shapes personal scope, territorial reach, comparison and possible justification:

• Workers—Article 45 TFEU: employment income, withholding, allowances and procedures affecting mobile workers.
• Establishment—Articles 49 and 54: stable economic participation, branches, subsidiaries, group taxation, CFC rules and corporate migration.
• Services—Article 56: temporary cross-border services, including tax rules affecting providers or recipients where no stable establishment controls.
• Capital—Article 63: investments, dividends, shareholdings and movements of capital; unlike the other freedoms, it can extend to third-country movements, subject to Treaty limits and a different context.

Classification follows the measure's purpose and the degree of influence attached to a shareholding, not the claimant's preferred label. A holding giving definite influence over company decisions generally points to establishment; a portfolio investment points toward capital. Several freedoms can be relevant, but one may be predominant.

There must also be a cross-border link. A wholly internal situation normally falls outside the freedoms unless another EU rule supplies jurisdiction.

Identify the restriction and comparator

A tax measure is suspect where it treats a non-resident, foreign establishment, outbound investment or cross-border payment less favourably than the relevant domestic equivalent. Examples include:

• group relief available for resident but not comparable non-resident subsidiaries;
• a higher withholding burden on outbound dividends or service payments;
• deductions allowed only for domestic funds, charities or pension providers;
• immediate taxation triggered by moving management or assets to another Member State; or
• procedures and cash-flow terms that disadvantage mobile workers or foreign companies.

Formal equality is not enough if the rule burdens cross-border activity more heavily. Different treatment may still be lawful where situations are not comparable in light of the rule's purpose.

In Chefquet, C-119/24, Article 45 precluded a flat income-tax surcharge on non-residents where it produced a heavier burden than the comparable municipal surcharge on some residents. Funding public services and preventing “reverse discrimination” could not justify the unequal design.

Residence can matter, but comparability is functional

In Schumacker, the Court explained that residents and non-residents are generally not comparable for personal and family allowances because the residence state normally sees worldwide income and ability to pay. But the position changed where the worker earned all or almost all family income in the work state and had insufficient income in the residence state for those circumstances to be recognised.

In that situation, there was “no objective difference” capable of justifying different treatment from a comparable resident. — Schumacker, C-279/93, paragraph 37

Comparability must therefore be tested against the objective of the specific deduction, allowance or regime. “Resident versus non-resident” is not the analysis by itself.

For companies, residence may allocate taxing jurisdiction, but resident and non-resident establishments can still be comparable regarding costs or income that the Member State has chosen to tax. A state cannot invoke lack of residence after bringing the relevant income within its tax jurisdiction and then deny connected treatment without examination.

Justifications must match the design of the rule

Direct or indirect nationality discrimination receives especially strict review. Other restrictions may be justified by an overriding public-interest reason recognised by the Court.

Common tax justifications include:

• preserving the balanced allocation of taxing powers between Member States;
• preventing losses from being deducted twice or freely shifted to the state where they have greatest tax value;
• maintaining the coherence of a tax system where a direct link exists between an advantage and offsetting charge;
• combating tax avoidance or wholly artificial arrangements; and
• ensuring effective fiscal supervision and collection.

The state must show how the measure advances the justification. Inconsistent design may fail suitability or coherence.

Preventing a fall in tax revenue is not by itself an overriding reason. Nor is administrative difficulty normally sufficient where information-exchange or evidence procedures can address the concern.

Anti-avoidance cannot presume that low tax means abuse

In Cadbury Schweppes, a company established controlled subsidiaries in a lower-tax Member State partly to obtain a tax advantage. The Court held that a tax motive did not itself constitute abuse. A restriction aimed at avoidance had to target arrangements that did not reflect economic reality.

CFC taxation had to be confined to “wholly artificial arrangements intended to escape the national tax normally payable”. — Cadbury Schweppes, C-196/04, operative part

Objective, third-party-ascertainable factors—such as premises, staff, equipment and genuine activity—were material. The taxpayer had to be able to produce evidence of real establishment.

Modern anti-abuse legislation and later case law may use different statutory tests, especially for artificial arrangements, beneficial ownership or abuse of rights. The enduring point is proportionality: a conclusive presumption covering genuine activity is harder to defend than a targeted rule with an effective opportunity to rebut.

Balanced taxing powers can justify a restriction, but not every method

Marks & Spencer accepted that excluding ordinary foreign-subsidiary losses from domestic group relief could be justified by the combined need to protect balanced taxing powers, prevent double relief and stop loss trafficking. But the restriction exceeded what was necessary in the exceptional situation where the non-resident subsidiary had exhausted past and current use in its residence state and no possibility of future use remained for it or a third party.

That “final losses” exception is narrow and has been treated strictly in later case law. It does not give groups a general option to import foreign losses. The exact corporate structure, applicable national law and legal impossibility of use—not mere economic inconvenience—must be examined.

The same discipline appears in exit taxation. In National Grid Indus, the departure state could determine tax on gains accrued during its taxing jurisdiction when effective management moved. But, under the rules assessed:

Article 49 precluded “immediate recovery” of that tax at the moment of transfer. — National Grid Indus, C-371/10, operative point 2

Crystallising the amount and collecting it immediately were different interferences. Current exit-tax directives and national instalment rules must be checked rather than applying the 2011 remedy mechanically.

Proportionality asks whether a narrower rule works

Even a legitimate objective does not validate an overbroad restriction. Ask whether the rule:

• is suitable and applied consistently;
• permits evidence addressing the actual risk;
• distinguishes genuine activity from artificial arrangements;
• avoids duplicating a tax charge or denial beyond what allocation requires;
• offers deferral, instalments or security calibrated to collection risk; and
• uses existing exchange-of-information and recovery mechanisms where adequate.

An equally effective, materially less burdensome alternative can expose disproportionality. In C-525/24, a certified declaration could be required for an upfront non-resident pension-fund exemption only if obtainable promptly and no less restrictive measure worked. Making it the sole proof for a withholding-tax refund was excessive where the tax authority could verify evidence through mutual assistance.

A practical assessment checklist

• Identify the taxpayer, transaction, states and tax years.
• Determine which freedom governs and whether third-country reach matters.
• Identify the domestic comparator and the objective of the tax advantage or burden.
• Measure cash-flow, procedural and deduction disadvantages.
• Separate a disparity between two systems from a restriction caused by one state.
• Test each asserted justification against evidence and the rule's actual design.
• Check rebuttal opportunities and less restrictive administration or collection tools.
• Verify relevant directives, later Court judgments and current national remedies.

Conclusion

Member States remain free to design direct taxes, but not to penalise genuine cross-border activity without a Treaty-compliant reason. The decisive sequence is freedom, restriction, functional comparability, justification and proportionality.

Residence, balanced taxing powers and anti-avoidance can matter, but none is a slogan that ends review. A defensible rule targets the real tax risk, treats comparable situations coherently and leaves no unnecessary obstacle to workers, establishments, services or capital moving across borders.

Sources

• Consolidated Treaty on the Functioning of the European Union
• Court of Justice judgment in Schumacker, C-279/93
• Court of Justice judgment in Marks & Spencer, C-446/03
• Court of Justice judgment in Cadbury Schweppes, C-196/04
• Court of Justice judgment in National Grid Indus, C-371/10
• Court of Justice judgment in Chefquet, C-119/24
• Court of Justice judgment in Case C-525/24