Fiscal (Tax) Residency
In general, the benefits of tax treaties are available only to persons who are residents of one of the treaty countries. In most cases, a resident of a country is any person that is subject to tax under the domestic laws of that country by reason of domicile, residence, place of incorporation, or similar criteria.
Generally, individuals are considered resident under a tax treaty and subject to taxation where they maintain their primary place of abode. However, residence for treaty purposes extends well beyond the narrow scope of primary place of abode. For example, many countries also treat persons spending more than a fixed number of days in the country as residents. The United States includes citizens and green card holders, wherever living, as subject to taxation, and therefore as residents for tax treaty purposes. Because residence is defined so broadly, most treaties recognize that a person could meet the definition of residence in more than one jurisdiction (i.e., "dual residence") and provide a “tie breaker” clause. Such clauses typically have a hierarchy of three to five tests for resolving multiple residency, typically including permanent abode as a major factor. Tax residency rarely impacts citizenship or permanent resident status, though certain residency statuses under a country's immigration law may influence tax residency.
Entities may be considered resident based on their country of seat of management, their country of organization, or other factors. The criteria are often specified in a treaty, which may enhance or override local law. It is possible under most treaties for an entity to be resident in both countries, particularly where a treaty is between two countries that use different standards for residence under their domestic law. Some treaties provide “tie breaker” rules for entity residency, some do not. Residency is irrelevant in the case of some entities and/or types of income, as members of the entity rather than the entity are subject to tax.
Read more about this topic: Tax Treaty