Double Tax Treaty Highlights Withholding Tax Rates & Key Provisions.

Introduction

Double tax treaties (DTTs) also referred to as double taxation avoidance agreements or conventions constitute the backbone of the international tax architecture. Concluded bilaterally between sovereign states, their primary function is to eliminate or mitigate the risk that the same income is subjected to taxation in two or more jurisdictions simultaneously. By allocating taxing rights between a source state and a residence state, treaties provide legal certainty, reduce effective tax costs on cross-border flows of income, and facilitate international investment, trade, and the mobility of capital and services.

The practical significance of DTTs is far-reaching. For multinational enterprises (MNEs), treaty provisions directly affect post-tax returns on cross-border investments through reduced withholding tax (WHT) rates on dividends, interest, and royalties paid to non-residents. For individual investors and portfolio managers, treaty protection determines the net yield on foreign sourced passive income. For tax administrations, treaties serve as instruments of international cooperation, embodying agreed rules on exchange of information, mutual assistance in tax collection, and anti-avoidance safeguards including the Principal Purpose Test (PPT), derived from the OECD/G20 Base Erosion and Profit Shifting (BEPS) project's Action 6 recommendations on preventing treaty abuse.

The current treaty landscape is being reshaped by three major forces: (i) the post-BEPS modernisation agenda, incorporating minimum standards and recommended best practices from the Multilateral Convention to Implement Tax Treaty Related Measures to Prevent BEPS (the MLI); (ii) bilateral renegotiations driven by changing economic relationships, investment patterns, and post-Brexit realignments; and (iii) the growing incorporation of source-country taxing rights over capital gains and passive income, reflecting a broader shift toward the source principle.

Portugal–United Kingdom | Article 10 – Dividends (Qualified Parent Company)

Replacing: 1968 Portugal–UK Convention

The new Portugal–UK treaty introduces a zero-rate withholding tax on dividends paid by a company resident in one contracting state to a parent company resident in the other. The exemption applies where the beneficial owner of the dividends is a company that has held, directly, at least 10% of the capital of the distributing entity for an uninterrupted period of not less than one year at the date of distribution. This represents the first availability of a full dividend exemption in the bilateral relationship between Portugal and the United Kingdom, a significant departure from the prior regime under which the lowest available rate was 15% (available for qualifying participations under the 1968 treaty).

Key Noteworthy Elements

→  The 10% participation threshold aligned with the OECD Model Convention Article 10(2)(a) standard, replacing the prior 25% threshold that applied under the 1968 treaty for the reduced 10% rate.

→  The minimum holding period of one year, measured at the date of dividend payment, mirrors the holding period requirement under the EU Parent-Subsidiary Directive (2011/96/EU)—a provision intentionally incorporated into the post-Brexit treaty framework to replicate, as far as practicable, the benefits previously available by virtue of EU law.

→  Both entities must be subject to corporate taxation, preventing the exemption from being claimed by tax-exempt or pass-through structures.

→  A separate 15% rate is prescribed for dividends distributed by tax-exempt investment vehicles deriving their income primarily from immovable property, reflecting the emerging treaty policy of preserving source-state taxation over real-estate income funds. This carve-out targets structures analogous to REITs and prevents treaty shopping through property investment wrappers.

→  The Principal Purpose Test (PPT) is embedded in the treaty, enabling the competent authority of the source state to deny the zero-rate exemption where one of the principal purposes of the arrangement was to secure the treaty benefit.

Portugal–United Kingdom | Article 11 – Interest (Regulated Banks)

Under Article 11 of the new Portugal–UK treaty, interest payments are generally subject to a 10% cap, but a preferential 5% withholding tax rate applies where the beneficial owner of the interest is a bank or other financial institution regulated and supervised in its country of residence. This lower rate for financial institutions reflects the high volume and systemic importance of interbank lending and regulated financial flows in the bilateral relationship, incentivising cross-border credit extension between the two jurisdictions.

Key Noteworthy Elements

→  Beneficial ownership of the interest is expressly required, preventing back-to-back structures from accessing the lower rate without genuine economic substance.

→  The provision is limited to regulated banks—entities subject to prudential supervision—and does not extend to unregulated lenders, conduit finance entities, or group treasury companies unless they qualify as regulated financial institutions under the applicable domestic law.

→  Interest paid to government entities, central banks, and their agencies is fully exempt (0%), while regulated bank interest attracts 5%, and all other interest is capped at 10%, creating a three-tiered structure that incentivises regulated financial activity.

Portugal–United Kingdom | Article 12 – Royalties

Treaty: Portugal–UK Convention (2026)

The royalties article in the new Portugal–UK treaty maintains a 5% withholding tax cap, unchanged in rate from the prior convention. However, a substantive and consequential definitional change has been introduced: payments for the use or right to use industrial, commercial, or scientific (ICS) equipment are expressly excluded from the definition of royalties. Similarly, gains derived from the sale of intellectual property rights are no longer characterised as royalties.

Key Noteworthy Elements

→  The exclusion of ICS equipment payments from the royalties definition is aligned with the 2017 OECD Model Convention, which moved equipment rental income out of Article 12 (Royalties) and into Article 7 (Business Profits) or Article 8 (Shipping and Air Transport), subject to PE analysis.

→  Under the new treaty, payments for the use of ICS equipment will be taxable as business profits only if the beneficial owner maintains a permanent establishment in the source state—otherwise, exclusive residence-state taxation applies. This is a materially more favourable outcome for lessors of equipment, as the 5% royalty withholding tax previously applied.

→  The beneficial owner test is expressly incorporated, replacing the previous formulation referring merely to the resident, bringing the provision into line with post-BEPS treaty language.

→  The 5% rate continues to apply to payments for intellectual property rights in the traditional sense: patents, trademarks, copyrights, and secret formulae.

Albania–Luxembourg | Article 10 – Dividends (Qualifying Corporate Shareholder)

Treaty: Albania–Luxembourg DTT with Amending Protocol (effective 1 January 2026)

The Albania–Luxembourg treaty provides for a 5% withholding tax on dividends where the beneficial owner is a company (other than a partnership) that holds, directly or indirectly, at least 25% of the capital of the distributing company. This reduced rate applies to qualifying corporate shareholders as a function of their substantive economic participation in the distributing entity.

Key Noteworthy Elements

→  The 25% participation threshold is comparatively high relative to the OECD Model Convention's standard 25% recommendation for the lower dividend rate—however, many more recent treaties have moved toward a 10% threshold. The Albania–Luxembourg 25% requirement therefore reflects a more conservative approach aligned with earlier treaty practice.

→  The 10% residual rate applies in all other cases (addressed in the 10% section below), creating a two-tiered dividend structure.

→  The treaty allows indirect holdings to qualify for the 5% rate, unlike some older treaties that required direct ownership only, which is a flexibility that can benefit holding structures.

→  Albania's domestic withholding tax on dividends stands at 8% for non-resident shareholders without treaty protection, making the 5% treaty rate a meaningful improvement for qualifying Luxembourg investors.

Albania–Luxembourg | Article 11 – Interest

Treaty: Albania–Luxembourg DTT with Amending Protocol (effective 1 January 2026)

The Albania–Luxembourg treaty provides for a 5% withholding tax on interest payments made to beneficial owners resident in the other contracting state, subject to the sovereign exemption noted above. This rate represents a significant reduction from Albania's domestic withholding tax rate of 15% applicable to interest paid to non-resident companies without treaty protection.

Key Noteworthy Elements

→  A single rate of 5% applies to all qualifying interest payments, without differentiation by the nature of the lender (i.e., bank versus non-bank), in contrast to the Portugal–UK framework which provides a tiered structure for financial institutions.

→  Luxembourg does not impose withholding tax on interest payments to non-residents under its domestic law—the 5% rate therefore operates primarily on Albanian-source interest paid to Luxembourg beneficiaries.

→  The 5% rate represents a substantial improvement over Albania's 15% domestic statutory rate, making Luxembourg-sourced financing into Albanian projects commercially competitive.

→  The Amending Protocol of 2020 ensured that the exchange of information and anti-abuse provisions (including the PPT) are incorporated, reducing the scope for treaty abuse through artificial financing structures.

Albania–Luxembourg | Article 12 – Royalties

Treaty: Albania–Luxembourg DTT with Amending Protocol (effective 1 January 2026)

The Albania–Luxembourg treaty provides for a 5% withholding tax on royalty payments. This provision is noteworthy in that it diverges from the OECD Model Convention approach, which provides for exclusive residence-state taxation of royalties under Article 12 with no source-state withholding tax. Instead, the Albania–Luxembourg treaty establishes a shared taxing right, with the source state retaining the right to impose a capped 5% withholding tax.

Key Noteworthy Elements

→  The treaty's departure from the OECD Model royalties approach reflects Albania's position as a developing economy that historically favoured source-state taxation of royalty flows. This is consistent with the UN Model Convention, which preserves source-state taxing rights on royalties.

→  Albania's domestic withholding tax rate on royalties is 15%, making the 5% treaty rate a significant improvement for Luxembourg IP holders licensing technology or intellectual property into Albania.

→  Luxembourg does not impose withholding tax on royalties under its domestic law, reinforcing its attractiveness as an IP holding jurisdiction for groups with Albanian operations.

→  The credit method applies in Luxembourg to eliminate double taxation on royalty income subject to Albanian WHT.

Hong Kong–Norway | Article 10 – Dividends (Qualifying Corporate Shareholding)

Treaty: Hong Kong SAR–Norway CDTA (signed 16 December 2025; pending ratification)

The Hong Kong–Norway Comprehensive Double Taxation Agreement (CDTA) provides for a 5% withholding tax rate on dividends paid by a Norwegian company to a Hong Kong resident that is the beneficial owner of the dividends, where that Hong Kong resident holds a qualifying percentage of the shares or voting rights in the Norwegian distributing company (typically, directly holds at least 10% or 25% of the company's capital, subject to the treaty's precise threshold provision). This 5% rate represents a dramatic reduction from Norway's domestic dividend withholding tax rate of up to 25% applicable to non-resident shareholders without treaty protection.

Key Noteworthy Elements

→  The reduction from 25% (Norway domestic rate) to 5% (CDTA qualifying rate) for significant corporate shareholders represents an 80% reduction in the effective withholding tax burden on qualifying dividend distributions—a particularly compelling incentive for Hong Kong corporate investors in Norwegian companies.

→  The CDTA, once ratified, will have effect from calendar year 2027 in Norway and year of assessment 2027/28 in Hong Kong—a timing consideration for investment decisions and cross-border structures.

→  Hong Kong does not impose withholding tax on dividends paid to non-residents under its domestic law, meaning the dividend article in the CDTA primarily generates benefits for Hong Kong residents receiving Norwegian-source dividends.

→  The CDTA incorporates the Principal Purpose Test (PPT) in accordance with BEPS Action 6, as well as anti-treaty abuse rules targeting triangular arrangements—structures where a Hong Kong enterprise derives Norway-source income but attributes it to a PE in a third jurisdiction will be denied treaty benefits.

India–France | Article 10 – Dividends (Qualifying Direct Investment Shareholder)

Replacing: Flat 10% rate under the 1992 India–France DTAC

The Amending Protocol to the India–France Double Taxation Avoidance Convention (DTAC) replaces the previously applicable flat 10% withholding tax rate on dividends with a two-tiered structure. Dividends paid by an Indian company to a French beneficial owner holding at least 10% of the capital of the Indian company are now subject to a reduced 5% withholding tax rate.

Key Noteworthy Elements

→  The shift from a uniform 10% rate to a differentiated structure—5% for direct investments and 15% for portfolio investments—reflects modern treaty policy that rewards substantive, long-term equity participation with lower withholding costs.

→  The Amending Protocol concurrently deletes the Most-Favoured-Nation (MFN) clause that previously appeared both in Article 7 of the DTAC and in the protocol to the 1992 convention. This deletion is one of the most consequential elements of the protocol: the MFN clause had historically allowed France to claim the benefit of any lower withholding tax rate India granted to an OECD country in a subsequent treaty. The Indian Supreme Court had ruled in 2023 that MFN benefits required a separate government notification, creating significant legal uncertainty. The protocol's deletion of the MFN clause resolves this ambiguity conclusively.

→  The 5% rate aligns the India–France treaty with comparable India treaties with other major OECD economies, where lower rates have been negotiated for qualifying direct investors.

→  The protocol incorporates BEPS minimum standards, including the PPT and updates to the permanent establishment article (adding a service PE clause), ensuring that the dividend rate reduction cannot be exploited through artificial structures.

Final Remark CGT.

Both the Portugal–UK and the India–France treaties introduce or expand source-state taxing rights over capital gains from the disposal of shares. In the India–France context, this represents a decisive policy shift toward source-based taxation of portfolio investment exits. In the Portugal–UK treaty, the provision is limited to shares in property-rich companies. Together, these developments signal a trajectory in which traditional residence-state taxation of capital gains is increasingly circumscribed in favour of source-country rights over value embedded in the source-state economy.

Conclusion

The treaties analysed in this blog represent a cross-section of contemporary international tax treaty practice at its most dynamic. From the post-Brexit reconstruction of the Portugal–UK bilateral framework, to the long-overdue modernisation of the India–France relationship, to the first-ever DTT between Luxembourg and Albania bringing BEPS-compliant standards to the Western Balkans, and to Hong Kong's strategic expansion of its CDTA network into Northern Europe, each development reflects a specific combination of bilateral economic interests and multilateral policy commitments.

For practitioners advising clients with exposure to these bilateral corridors, the key practical takeaways are: first, re-examine withholding tax costs on existing intercompany flows and investment structures against the new rates and conditions; second, stress-test current structures against the PPT; third, reassess the characterisation of cross-border payments (particularly equipment rentals and technical services) in light of definitional changes; and fourth, ensure that beneficial ownership documentation is robust and contemporaneous.

The evolution of treaty practice toward greater anti-abuse integration, source-state real estate taxation, and differentiated withholding rate structures based on economic substance and investment thresholds is not a temporary phenomenon—it is the defining trajectory of the post-BEPS international tax architecture. Treaties are no longer merely instruments of tax relief; they are increasingly tools for allocating taxing rights in a manner that rewards genuine economic activity and penalises artificial arrangements. Taxpayers and their advisors must engage with this landscape with commensurate rigour.