Double Taxation Avoidance Agreements

Definition and Types of Double Taxation

With the acceleration of technological advancements and the intensification of globalization, commercial borders between states have become increasingly flexible and, in many areas, have begun to lose their significance altogether. This transformation has facilitated the expansion of trade across wider geographical regions, significantly enhancing commercial relations not only at the regional level but also on a global scale. Simultaneously, the process of trade liberalization has strengthened economic interaction between states while also leading to a simultaneous increase in the cross-border movement of goods, services, capital, and labor. As a result of these developments, various uncertainties have emerged regarding which jurisdiction is entitled to tax the income earned by individuals and entities operating in more than one country. The source state asserts its taxing rights on the basis that the income originates within its territory, whereas the state of residence claims the same income based on the taxpayer’s residential status. This situation is commonly referred to in the legal literature as double taxation. Double taxation arises when two different jurisdictions simultaneously exercise their taxing rights over the same income or gain, resulting in the taxpayer being subject to taxation twice on the same income. In today’s globalized economy, with the increased mobility of capital and labor, individuals and corporations frequently generate income in multiple jurisdictions. Combined with efforts by states to protect their respective tax bases, this reality has rendered the issue of double taxation increasingly complex. To address this problem and to prevent taxpayers from being taxed twice on the same income, international agreements aimed at the avoidance of double taxation are concluded. Through these agreements, states mutually limit their taxing rights and seek to eliminate the occurrence of double taxation. Such agreements not only alleviate the financial burden on individuals and corporations but also contribute to the development of economic relations between states, encourage cross-border investments, and support the principle of tax equity. By reducing legal and fiscal uncertainty, these agreements create a more secure investment environment and often include mechanisms such as the exchange of information to prevent tax evasion.

Definition and Types of Double Taxation

Double taxation refers to the imposition of tax on the same item of income or gain by two or more jurisdictions during the same fiscal period, resulting in the taxpayer being subjected to multiple tax liabilities on the same income. This issue has become increasingly significant with the growth of international economic activities. As individuals and corporations have begun to generate income in multiple jurisdictions, such income may be taxed both in the jurisdiction where it originates and in the jurisdiction where the taxpayer is considered resident. Double taxation is also defined under Article 117 of the Tax Procedure Law, which describes it as the imposition or collection of tax more than once on the same tax base within the same taxation period under the application of the same tax law. For double taxation to occur, the type of tax, the taxpayer, the subject matter of the tax, and the tax period must be identical. When all four elements are present within a single jurisdiction, it constitutes domestic double taxation. However, when more than one jurisdiction claims taxing rights over the same income, international double taxation arises. The emergence of double taxation not only places a significant financial burden on taxpayers but also hinders the development of international trade and investment. Therefore, bilateral agreements concluded between states to eliminate double taxation are considered indispensable legal instruments for maintaining sound international economic relations. These agreements regulate the allocation of taxing rights and determine the procedures and rates for the collection of taxes, thereby preventing taxpayers from being subject to unnecessary fiscal burdens.

International Approaches to Avoiding Double Taxation

In a globalized economy where capital, goods, and services increasingly flow across borders, the overlap of different national tax systems has given rise to the issue of double taxation, which presents significant financial and economic challenges for both taxpayers and states. When multiple jurisdictions assert taxing rights over the same item of income, this results in unjust and duplicative tax burdens for taxpayers. Such situations discourage foreign direct investment, redirect economic activities to other jurisdictions, and encourage the development of aggressive tax planning strategies. Preventing double taxation at the international level is therefore of paramount importance, both for ensuring tax equity and for fostering a competitive and attractive investment climate. In this context, states enter into bilateral agreements that establish mutually accepted rules determining which jurisdiction may exercise taxing rights in specific cases related to the taxation of income and wealth. These agreements go beyond merely eliminating double taxation; they also serve multiple functions, such as combating tax evasion, facilitating the exchange of tax-related information, enhancing administrative cooperation, promoting tax transparency, preventing artificial profit shifting, and ensuring legal certainty for taxpayers.

Most of these agreements are based on the OECD Model Tax Convention or the United Nations Model Double Taxation Convention. While the OECD model typically grants primary taxing rights to the state of residence, the UN model allows greater taxing rights to the source state. A significant number of the treaties signed by Türkiye are based on the OECD model, which generally limits the taxing rights of the source state. Through specific provisions in these agreements, taxing rights are allocated according to the type of income—such as dividends, interest, royalties, or business profits. Some categories of income may be subject to zero or reduced tax rates, while double taxation is typically eliminated through exemption or credit methods. In practice, the mutual agreement procedure enables competent authorities of the contracting states to collaborate in resolving tax disputes encountered by taxpayers. In certain cases, arbitration mechanisms are also employed to settle such disputes.

Türkiye has concluded and implemented double taxation avoidance agreements with more than 80 countries. These treaties contribute to the international harmonization of tax rules and provide a predictable tax environment for foreign investors. Furthermore, as part of its commitment to the OECD’s Base Erosion and Profit Shifting (BEPS) initiative, Türkiye is a party to the Multilateral Instrument (MLI), thereby aligning its bilateral tax treaties with the latest international tax standards. In this respect, double taxation avoidance agreements are not merely financial instruments; they are strategic tools that promote international cooperation, economic integration, and global tax transparency.

Structural Components of DTAA Frameworks

Double taxation avoidance agreements are among the fundamental instruments of international tax law and are structured around specific legal components within a systematic framework. The definitions section, typically placed at the beginning of the agreement, ensures a uniform interpretation of key terms such as “residence,” “permanent establishment,” “income,” “company,” “associated enterprise,” and “competent authority” by the contracting states. For instance, the term “residence” is crucial in determining a person’s tax status and, in cases of dual residency, is resolved using criteria such as “centre of vital interests” or “permanent home.” The scope of the agreement defines the persons and taxes to which the treaty applies—most commonly covering income and capital taxes while excluding indirect taxes. A central structural element is the allocation of taxing rights, which stipulates the conditions and rates under which source and residence states may tax various categories of income, including dividends, interest, royalties, business profits, and income from immovable property. For example, under the treaty between Türkiye and Germany, the source state may levy tax on dividends at rates between 5% and 15%, with the remaining taxing right allocated to the residence state. The concept of a “permanent establishment” is equally significant, as it allows taxation by the source state only on profits attributable to a fixed place of business maintained therein.

Double taxation is typically relieved either through the exemption method—where the income is excluded from taxation in the residence state—or the credit method—where taxes paid in the source state are credited against taxes due in the residence state, as would occur when a Turkish resident earns interest income from Germany. The non-discrimination article prohibits a contracting state from subjecting the nationals, companies, or permanent establishments of the other state to more burdensome taxation than it imposes on its own nationals, thereby ensuring equal treatment for foreign investors. The mutual agreement procedure enables the competent authorities of both states to resolve disputes or interpretive differences arising from the application of the treaty, as in cases where a taxpayer is deemed to have a permanent establishment in both jurisdictions and faces double taxation. Some modern treaties also include binding arbitration clauses to protect taxpayer rights where mutual agreement fails. Provisions on information exchange and administrative assistance are effective tools in combating tax evasion, facilitating transparent data sharing between tax authorities, particularly in overcoming bank secrecy obstacles. In recent years, these clauses have been reinforced under the OECD’s automatic exchange of information standard. Finally, provisions governing the entry into force, duration, and termination of the agreement offer a clear legal basis for treaty revision or withdrawal. Collectively, these structural components elevate double taxation treaties from technical tax instruments to strategic tools for balancing fiscal sovereignty and fostering global economic cooperation.

Turkish Domestic Implementation of DTAA Principles

To prevent double taxation, Türkiye has adopted a set of legal provisions within the framework of its domestic income tax and corporate tax legislation. These provisions allow taxpayers who are resident in Türkiye to credit foreign taxes paid against their domestic tax liabilities. The credit method is applied based on the principle of tax residency, whereby taxes paid abroad by Turkish residents can be deducted from their Turkish tax liabilities, thereby mitigating the risk of double taxation. However, these rules apply exclusively to residents of Türkiye and do not extend to non-resident taxpayers who generate income from Turkish sources. In such cases, the same item of income may be taxed both in Türkiye and in the taxpayer’s country of residence. Where taxation is based on nationality rather than residency, the exemption method is applied in Türkiye. Under Article 123 of the national income tax legislation, taxes paid abroad on income and gains earned by full taxpayers may be deducted from the portion of the domestic income tax assessed on foreign-sourced income. For such deductions to be permitted, the foreign tax must qualify as a personal income tax levied on income, and the payment must be supported by certified documentation issued by competent authorities.

Under the corporate tax regime, taxes paid on foreign-sourced income may similarly be credited against corporate tax assessed in Türkiye. Article 33 of the corporate tax legislation provides that taxes paid abroad on income transferred to Türkiye’s general accounts may be credited against domestic corporate tax liabilities. However, a critical limitation is imposed: the amount credited may not exceed the amount of tax that would have been payable in Türkiye, calculated at the applicable corporate tax rate specified in Article 32. These mechanisms play a vital role in preventing double taxation within Türkiye’s tax system and contribute to the fair and equitable taxation of taxpayers operating across borders.

Case Study: Türkiye–Canada Double Tax Treaty

The Agreement between the Republic of Türkiye and Canada for the Avoidance of Double Taxation and the Prevention of Fiscal Evasion with Respect to Taxes on Income and Capital, signed in 1986, represents a significant step in the context of international tax regulation. This bilateral treaty was designed to eliminate the risk of taxpayers in both jurisdictions being taxed twice on the same income, thereby fostering cross-border trade and investment. As with all international agreements affecting domestic legal systems, the treaty required alignment with Türkiye’s internal legal framework. Accordingly, the Council of Ministers approved its implementation in 2011, officially incorporating it into Türkiye’s domestic legal order. Under the agreement, income derived in Canada is subject to taxation there, while Turkish residents may offset taxes paid in Canada against their domestic tax liabilities, thereby avoiding double taxation. This mechanism has allowed taxpayers to be taxed in only one jurisdiction for the same income, promoting fairness and efficiency in international taxation.

Beyond preventing double taxation, the treaty also establishes a framework for administrative cooperation between the tax authorities of the two countries. It provides for the exchange of information, allowing tax administrations to verify taxpayer declarations and detect potential instances of tax evasion. This cooperation enhances transparency and strengthens the integrity of both tax systems. Following its ratification and entry into force, the treaty has contributed to the international compatibility of Türkiye’s tax regulations, increased legal certainty for taxpayers, and reinforced the attractiveness of Türkiye as a destination for foreign investment. It has also signaled Türkiye’s commitment to aligning its fiscal policies with international standards while reinforcing its position in global economic and tax governance. The implementation of the treaty has not only benefited taxpayers but has also enabled Türkiye to fulfill its obligations under international tax law and further integrate into the global tax framework.

Final Remarks and Policy Implications

Double taxation avoidance agreements are vital legal instruments that eliminate one of the most significant barriers to international trade and investment in an increasingly globalized world. The agreement between Türkiye and Canada in this context has contributed to the deepening of bilateral economic relations and has relieved taxpayers from the burden of being taxed twice on the same income. The ratification and entry into force of the agreement reinforced Türkiye’s efforts to align its tax legislation with international standards while creating a more predictable fiscal environment for foreign investors. Both countries have also cooperated in combating tax evasion and enhancing transparency, thereby increasing the effectiveness of their respective tax administrations. By virtue of its approval through a decision of the Council of Ministers, the agreement has added credibility to Türkiye’s tax system at the international level, eased the tax burden on taxpayers, and effectively addressed the issue of double taxation. Ultimately, such agreements not only reduce the financial strain on taxpayers but also serve as strategic tools for promoting economic integration and international cooperation.

References

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