Case Study: Double taxation relief in Europe

Double taxation relief in Europe is the set of legal mechanisms that prevent the same income from being taxed twice by two different states. For cross-border businesses and internationally mobile individuals, failing to claim this relief correctly can mean paying tax twice on the same profit - a direct and avoidable financial loss. This article examines how relief works in practice across major European jurisdictions, which treaty tools apply, what procedural steps are required, and where international clients most commonly go wrong.

Double taxation arises when two states each assert taxing rights over the same income or gain. In Europe, relief is delivered primarily through bilateral Double Taxation Treaties (DTTs), which follow the OECD Model Tax Convention framework. Most European Union member states have also adopted the EU Interest and Royalties Directive and the EU Parent-Subsidiary Directive, which provide additional relief at the EU level.

A DTT is a binding international agreement that allocates taxing rights between two contracting states. Each treaty specifies which state has primary taxing rights over particular income categories - dividends, interest, royalties, capital gains, employment income, and business profits. The treaty then obliges the other state to provide relief, either by exempting the income from its own tax or by granting a credit for tax paid in the first state.

The two principal relief methods are the exemption method and the credit method. Under the exemption method, the residence state simply excludes the foreign income from its tax base. Under the credit method, the residence state taxes the income but allows a deduction for foreign tax paid, up to the amount of domestic tax that would otherwise be due. Many European DTTs use a combination: the exemption method for business profits and the credit method for passive income such as dividends and royalties.

A non-obvious risk for international clients is that treaty relief is not automatic. The taxpayer must actively claim it, comply with procedural requirements in both states, and often obtain a certificate of tax residence from the competent authority of the residence state. Missing these steps means the withholding tax is levied in full at domestic rates, and recovery requires a separate refund procedure that can take twelve to twenty-four months.

Withholding tax (WHT) is the most frequent source of double taxation disputes in Europe. When a company in Germany pays a dividend to a shareholder resident in the Netherlands, Germany';s domestic WHT rate under the Einkommensteuergesetz (Income Tax Act) is 25 percent plus solidarity surcharge. The Germany-Netherlands DTT reduces this to 5 percent for corporate shareholders holding at least 10 percent of the paying company, and to 15 percent for other shareholders.

To benefit from the reduced treaty rate, the Dutch shareholder must submit a WHT relief application to the Bundeszentralamt für Steuern (Federal Central Tax Office, BZSt) before or at the time of payment. The BZSt issues a refund or an exemption certificate. If the application is filed after payment, a refund claim must be submitted within four years of the end of the calendar year in which the dividend was paid - a hard deadline under the Abgabenordnung (General Tax Code), section 169.

In practice, many international shareholders miss the pre-payment filing window and then face the refund route. The refund process requires a Dutch tax residence certificate, proof of beneficial ownership, and documentation that the shareholder is not a conduit entity. German tax authorities scrutinise beneficial ownership claims carefully following amendments to the Einkommensteuergesetz, section 50d, which introduced anti-avoidance provisions targeting treaty shopping.

A common mistake is assuming that holding shares through an intermediate EU holding company automatically preserves treaty benefits. Post-2021 German case law has confirmed that intermediate entities lacking genuine economic substance in their jurisdiction of incorporation will be denied WHT relief, even where a valid DTT exists. The same principle applies in France under the Code général des impôts (General Tax Code), article 119 ter, and in the Netherlands under the Wet op de dividendbelasting (Dividend Withholding Tax Act).

To receive a checklist on withholding tax relief procedures in European jurisdictions, send a request to info@vlolawfirm.com

Business profits are taxable in a state only if the enterprise has a permanent establishment (PE) there. A PE is defined in each DTT, generally following OECD Model Article 5, as a fixed place of business through which the enterprise wholly or partly carries on its business. The PE concept is central to corporate tax disputes across Europe.

The practical risk arises when a foreign company sends employees or agents to another European state for extended periods. If those individuals habitually conclude contracts on behalf of the company, a dependent agent PE may arise under the DTT, even without a physical office. The OECD Base Erosion and Profit Shifting (BEPS) Action 7 recommendations, incorporated into many post-2017 European DTTs, broadened the dependent agent PE definition and narrowed the preparatory and auxiliary activity exemptions.

Consider a scenario involving a Swiss technology company with a sales team operating in France for more than twelve months. Under the France-Switzerland DTT, article 5, a PE is likely to exist if the sales staff have authority to conclude contracts. France would then assert taxing rights over the profits attributable to that PE under article 7 of the same treaty. The Swiss company must file a French corporate tax return, maintain separate PE accounts, and apply the OECD-approved profit attribution method. Failure to do so exposes the company to French tax reassessment, penalties under the Livre des procédures fiscales (Tax Procedures Code), article L. 80 A, and potential criminal liability for tax fraud.

A less obvious risk is the interaction between PE status and VAT registration obligations. Establishing a PE for income tax purposes does not automatically create a VAT fixed establishment, but tax authorities in France, Germany and Spain increasingly treat the two concepts as aligned. An unregistered VAT fixed establishment triggers back-taxes, interest and penalties that can exceed the original income tax liability.

Residency conflicts occur when two states each claim that an individual or company is tax resident within their territory. For individuals, this most commonly arises when a person maintains a home in one European state while working predominantly in another. For companies, it arises when the place of incorporation and the place of effective management diverge.

DTT tie-breaker rules for individuals follow a sequential test: permanent home, centre of vital interests, habitual abode, nationality, and finally mutual agreement between competent authorities. The centre of vital interests test - which considers personal and economic ties - is the most frequently litigated. Courts in the United Kingdom, Germany and France have each developed their own interpretation of this concept, and outcomes are fact-specific.

For companies, the OECD Model Convention, article 4(3), as revised by the BEPS Multilateral Instrument (MLI), replaces the automatic tie-breaker based on place of effective management with a mutual agreement procedure (MAP). This means that when two states both claim corporate tax residence, the competent authorities must negotiate a resolution. MAP proceedings under most European DTTs have no fixed deadline, though the EU Dispute Resolution Directive (Council Directive 2017/1852/EU) requires EU member states to resolve MAP cases within two years, extendable by one year.

In practice, MAP proceedings are slow and resource-intensive. A company caught in a dual-residence dispute may face simultaneous tax assessments in both states, cash flow pressure from paying tax twice pending resolution, and uncertainty about which state';s rules govern deductions, losses and group relief. Engaging specialist tax counsel at the outset - before filing returns in either state - reduces the risk of positions being locked in that are difficult to unwind.

A Netherlands-incorporated holding company owns 100 percent of a Polish operating subsidiary. The Polish subsidiary distributes a dividend. Under Polish domestic law, the Ustawa o podatku dochodowym od osób prawnych (Corporate Income Tax Act), article 22, imposes a 19 percent WHT on dividends paid to foreign shareholders. The Netherlands-Poland DTT reduces this to 0 percent for corporate shareholders holding at least 10 percent for an uninterrupted period of two years, mirroring the EU Parent-Subsidiary Directive conditions.

To claim the 0 percent rate, the Dutch parent must provide the Polish subsidiary with a Dutch tax residence certificate and a statement confirming beneficial ownership and the two-year holding period. The Polish subsidiary then applies the reduced rate at source. If the certificate is not provided in time and full WHT is deducted, the Dutch parent must file a refund claim with the Urząd Skarbowy (Tax Office) in Poland within five years of the end of the tax year in which the dividend was paid, under the Ordynacja podatkowa (Tax Ordinance), article 79.

A hidden pitfall in this scenario is the Polish anti-avoidance rule introduced in 2019, which requires the paying entity to verify that the recipient is the actual beneficial owner and that the payment is not part of an artificial arrangement. Polish tax authorities have denied WHT relief in cases where the Dutch holding company lacked genuine economic substance - no employees, no office, no independent decision-making capacity. Restructuring the holding to add substance before the dividend is paid is significantly cheaper than litigating a denied relief claim.

To receive a checklist on beneficial ownership documentation for European holding structures, send a request to info@vlolawfirm.com

A United Kingdom tax resident owns a residential property in Spain and receives rental income. Spain taxes non-resident rental income under the Ley del Impuesto sobre la Renta de no Residentes (Non-Resident Income Tax Act), article 24, at 19 percent for EU/EEA residents and 24 percent for others. The UK-Spain DTT, article 6, confirms that Spain has primary taxing rights over immovable property income.

The UK resident must also declare the Spanish rental income in their UK Self Assessment return. Under the UK Income Tax (Trading and Other Income) Act 2005, section 575, foreign rental income is taxable in the UK. Relief is available under the UK-Spain DTT credit method: the UK allows a credit for Spanish tax paid, reducing the UK tax liability by the amount of Spanish tax already paid. If the Spanish tax rate exceeds the UK rate, no additional UK tax is due, but the excess Spanish tax is not refundable by the UK.

A common mistake is failing to file the Spanish non-resident tax return on time. The Agencia Tributaria (Spanish Tax Agency) imposes automatic surcharges of between 5 and 20 percent for late filing, plus interest. Many UK-resident property owners assume that because they pay UK tax on the income, no Spanish filing obligation exists. This assumption is incorrect and leads to accumulated penalties that can exceed several years of rental income.

A German parent company licenses intellectual property to its Irish subsidiary. The Irish subsidiary pays royalties to the German parent. Under Irish domestic law, the Taxes Consolidation Act 1997, section 238, imposes a 20 percent WHT on royalties paid to non-residents. The Germany-Ireland DTT, article 12, reduces this to 0 percent.

To apply the 0 percent rate, the Irish subsidiary must obtain a direction from Revenue Commissioners (Irish Tax Authority) authorising payment without deduction. The application requires a German tax residence certificate and confirmation that the German parent is the beneficial owner of the royalties. Revenue Commissioners typically process these applications within four to eight weeks.

The non-obvious risk here involves the German Außensteuergesetz (Foreign Tax Act), section 1, which requires that royalty payments between related parties reflect arm';s length pricing. If the royalty rate is above market, German tax authorities may recharacterise the excess as a hidden profit distribution, deny the deduction in Germany, and impose German corporate income tax on the excess amount. The Irish subsidiary may simultaneously face a transfer pricing adjustment under the Taxes Consolidation Act 1997, section 835C. Both adjustments can occur without either state providing relief for the other';s assessment, resulting in genuine economic double taxation that is not covered by the DTT.

The procedural path for claiming DTT relief varies by jurisdiction and income type. The following steps apply across most European jurisdictions, with jurisdiction-specific variations.

• Obtain a tax residence certificate from the competent authority of the residence state. Processing times range from five business days in Ireland to six to eight weeks in Germany.
• Submit the certificate and a beneficial ownership declaration to the paying entity or the withholding agent before payment, where the treaty allows reduced-rate withholding at source.
• Where full WHT has been deducted, file a refund claim with the tax authority of the source state within the applicable limitation period - typically four to five years from the end of the relevant tax year.
• Maintain documentation of the economic substance of the recipient entity throughout the relevant period, not only at the time of the claim.

If the source state denies relief, the taxpayer may appeal to the domestic courts of that state or invoke the MAP procedure under the applicable DTT. The EU Dispute Resolution Directive provides an additional layer for intra-EU disputes: if MAP fails within two years, either state';s taxpayer may request the establishment of an advisory commission that must issue an opinion within six months.

MAP is the treaty mechanism through which the competent authorities of two contracting states negotiate to eliminate double taxation that cannot be resolved through domestic procedures. Under the OECD Model Convention, article 25, a taxpayer may request MAP within three years of the first notification of the action resulting in double taxation. Many European DTTs have adopted this three-year window, though some older treaties retain shorter periods.

MAP is appropriate when domestic appeal remedies are exhausted or unlikely to succeed, when the double taxation arises from a transfer pricing adjustment in one state, or when a residency conflict cannot be resolved unilaterally. It is not a fast process: average resolution times across OECD member states exceed twenty-four months, and complex cases involving multiple income streams or multi-year adjustments can take considerably longer.

A practical consideration is that MAP does not suspend domestic collection proceedings in most European states. The taxpayer may need to pay the disputed tax, provide a bank guarantee, or obtain a suspension order from the domestic court while MAP is pending. Failing to manage this cash flow risk is a frequent and costly oversight.

We can help build a strategy for MAP proceedings and coordinate with competent authorities in multiple European jurisdictions. Contact info@vlolawfirm.com

European states have progressively strengthened domestic anti-avoidance rules that can override treaty benefits. The principal anti-avoidance tools relevant to double taxation relief are the principal purpose test (PPT), the limitation on benefits (LOB) clause, and domestic general anti-avoidance rules (GAAR).

The PPT, introduced into most post-MLI European DTTs, denies treaty benefits if one of the principal purposes of an arrangement was to obtain those benefits, unless granting them would be consistent with the object and purpose of the treaty. This is a subjective test that requires analysis of the taxpayer';s intentions and the commercial rationale of the structure.

The EU Anti-Tax Avoidance Directive (ATAD, Council Directive 2016/1164/EU), article 6, requires all EU member states to apply a GAAR that denies tax benefits for arrangements that are not genuine and that are put in place for the essential purpose of obtaining a tax advantage. This GAAR operates alongside treaty anti-avoidance provisions and can deny relief even where a DTT technically applies.

Many underappreciate the interaction between these rules. A structure that was compliant when established may become non-compliant following changes to domestic anti-avoidance legislation, treaty renegotiation, or shifts in administrative practice. Regular review of holding and financing structures is not optional for businesses with significant cross-border income flows in Europe.

The decision to pursue double taxation relief through a refund claim, MAP, or domestic appeal must be assessed against the likely cost, duration and probability of success. Lawyers'; fees for a straightforward WHT refund claim in Germany or France typically start from the low thousands of euros. A contested MAP proceeding involving transfer pricing adjustments across two jurisdictions can cost significantly more, with professional fees running into the tens of thousands of euros over two to three years.

The amount at stake is the primary driver. For WHT refund claims below a certain threshold - typically below EUR 10,000 to EUR 20,000 - the cost of professional representation may approach or exceed the recoverable amount. In these cases, self-representation using standardised forms provided by the tax authority is often more economical, provided the factual and legal position is straightforward.

For larger amounts, the procedural burden of a MAP or domestic appeal is justified. Transfer pricing disputes, PE attribution disputes, and dual-residency conflicts routinely involve amounts in the hundreds of thousands or millions of euros. In these cases, the cost of non-specialist mistakes - filing in the wrong jurisdiction, missing a limitation period, or failing to document substance adequately - can be catastrophic and irreversible.

In some cases, restructuring the cross-border arrangement is more efficient than repeatedly claiming relief on existing structures. Restructuring may be appropriate when the existing structure generates recurring WHT exposure that requires annual relief claims, when the beneficial ownership or substance requirements for treaty relief cannot be met without significant investment, or when the applicable DTT provides less favourable terms than an alternative treaty network.

For example, a company routing royalties through a jurisdiction with a thin treaty network and high WHT rates may achieve better outcomes by migrating the IP holding function to a jurisdiction with a broader treaty network, such as the Netherlands or Luxembourg, provided the migration is commercially justified and the new structure has genuine economic substance. The cost of restructuring - legal fees, transfer taxes, potential exit charges - must be weighed against the present value of future WHT savings.

A non-obvious risk of restructuring is the exit tax. Germany, France and Spain each impose exit taxes on the unrealised gains embedded in assets transferred out of their tax jurisdiction, under the Einkommensteuergesetz section 6, the Code général des impôts article 221 bis, and the Ley del Impuesto sobre Sociedades (Corporate Income Tax Act) article 19, respectively. The EU Exit Tax Directive (Council Directive 2016/1164/EU), article 5, requires EU member states to allow deferral of exit tax on intra-EU transfers, but the deferral conditions and interest charges vary by state.

To receive a checklist on restructuring options for cross-border European income flows, send a request to info@vlolawfirm.com

The choice between the exemption method and the credit method has material economic consequences. Under the exemption method, the residence state excludes foreign income from its tax base entirely. This is straightforward but means that foreign losses also cannot be offset against domestic income in most jurisdictions.

Under the credit method, the residence state taxes the foreign income but credits the foreign tax paid. If the foreign tax rate is lower than the domestic rate, the taxpayer pays a top-up in the residence state. If the foreign tax rate is higher, the excess is not refunded - it represents a permanent cost. This asymmetry means that the credit method is less favourable for income sourced in high-tax jurisdictions.

In practice, the method applicable to a particular income stream is determined by the DTT, not by the taxpayer';s preference. However, where a taxpayer has discretion over the legal characterisation of a payment - for example, whether a payment is structured as a dividend, interest or royalty - the choice of characterisation affects which treaty article applies and therefore which relief method is available. This is a legitimate planning consideration, provided the characterisation reflects the economic substance of the arrangement.

We can assist with structuring the next steps for cross-border income arrangements and treaty relief strategies in Europe. Contact info@vlolawfirm.com

What is the biggest practical risk when claiming double taxation relief in Europe?

The biggest practical risk is missing the procedural deadlines for filing relief claims or refund applications. Each European jurisdiction sets its own limitation periods - typically four to five years from the end of the relevant tax year - and these periods are strictly enforced. A claim filed one day late is permanently barred, regardless of its merits. A second major risk is failing to establish and document the beneficial ownership of the income recipient. European tax authorities have significantly increased scrutiny of beneficial ownership claims, and a denial on this ground can result in full domestic WHT being levied with no right of recovery under the treaty.

How long does it take to recover withheld tax through a refund claim, and what does it cost?

Processing times for WHT refund claims vary considerably. Germany';s BZSt typically processes straightforward claims within six to twelve months. France';s Direction générale des finances publiques (General Directorate of Public Finances) can take twelve to eighteen months for non-resident refund claims. Poland and Spain have similar timelines. Complex claims involving beneficial ownership disputes or anti-avoidance challenges can take two to three years, including domestic appeal proceedings. Professional fees for a standard refund claim start from the low thousands of euros; contested claims or MAP proceedings cost significantly more. Interest on refunded amounts is generally available but at modest rates, meaning the time value of money is a real cost.

When should a business use MAP rather than domestic court proceedings to resolve a double taxation dispute?

MAP is preferable when the double taxation arises from a transfer pricing adjustment or a residency conflict that requires coordination between two states, because domestic courts can only rule on one state';s position and cannot bind the other state. Domestic court proceedings are more appropriate when the dispute concerns the interpretation of domestic law rather than the allocation of taxing rights between states, or when the taxpayer needs a faster resolution than MAP can provide. In EU member states, the EU Dispute Resolution Directive provides a backstop: if MAP fails, an advisory commission must be convened. For non-EU treaty partners, there is no equivalent backstop, and MAP outcomes depend entirely on the willingness of both competent authorities to reach agreement. In practice, combining a domestic appeal with a parallel MAP request preserves all options and prevents limitation periods from running.

Double taxation relief in Europe is a technically demanding area where procedural compliance, documentation quality and timing determine outcomes as much as the underlying legal merits. The treaty framework is well-developed, but its benefits are not self-executing. Businesses and individuals with cross-border income flows in Europe must actively manage their relief claims, maintain adequate substance in holding and IP structures, and monitor changes to domestic anti-avoidance rules that can erode treaty benefits. The cost of inaction or uninformed action - in the form of unrecovered WHT, MAP delays, or restructuring exit taxes - consistently exceeds the cost of early specialist engagement.

Our law firm VLO Law Firms has experience supporting clients in European jurisdictions on double taxation relief, treaty interpretation, MAP proceedings, and cross-border tax structure compliance. We can assist with preparing WHT relief applications, beneficial ownership documentation, MAP requests, and restructuring analysis across multiple European jurisdictions. To receive a consultation, contact: info@vlolawfirm.com