Double tax treaties aim to prevent unrelieved double taxation, in order to foster cross-border economic activity and the transfer of technology. Countries generally use models as a starting point when negotiating tax treaties. As the UN Model Double Taxation Convention between Developed and Developing Countries generally favours retention of greater host country taxing rights, it tends to be relied upon more by developing countries than the OECD Model Tax Convention on Income and on Capital.
The UN Model Taxation Convention consists of articles on the treaty’s scope and on definitions to be used in the treaty. For different kinds of income and capital, it allocates taxing rights before establishing how double taxation will be eliminated where the taxing rights are shared. It also includes articles that prevent certain forms of tax discrimination; provide for the exchange of tax information and assistance in tax collection between the treaty partners; allow the treaty partners to consult together, through the Mutual Agreement Procedure, to resolve disputes or address doubts concerning the treaty; and address certain types of treaty abuse.
The most important changes included in the 2021 version of the UN Model address concerns expressed by developing countries regarding tax treaty obstacles to the taxation of foreign enterprises on income from automated digital services and on gains on so-called “offshore indirect transfers”. The 2021 UN Model also features new guidance on the application and interpretation of the definition of permanent establishment, the concept of beneficial owner, and the application of the Model’s provisions to collective investment vehicles, pensions funds and real estate investment trusts.
This fifth edition of the UN Model Tax Convention culminates four years of work by the UN Tax Committee and its Subcommittees, supported by the Secretariat in the UN Department of Economic and Social Affairs. Since its first publication in 1980, the Model has been updated previously in 2001, 2011 and 2017.
UN Model Double Taxation Convention between Developed and Developing Countries  
UN Manual on Negotiation of Bilateral Tax Treaties between Development and Developing Countries
UN Handbook on Avoidance and Resolution of Tax Disputes (forthcoming) [English] [Spanish]
UN Online Primer on Mutual Agreement Procedure (MAP)