What is Tax Residency? Definition & Guide
The jurisdiction where a person is obligated to pay taxes, typically determined by physical presence (183+ days per year) or other connecting factors.
Tax residency determines which country has the right to tax an individual's income. Most countries use physical presence as the primary test: a person who spends 183 days or more in a country during a calendar year is generally considered a tax resident of that country.
However, tax residency rules vary. Some countries use additional criteria: the location of the person's permanent home, their center of vital interests (family, economic ties), or their habitual abode. Portugal, for example, considers a person tax resident if they have a habitual residence in Portugal, even if they spend fewer than 183 days there.
For Golden Visa holders, tax residency is a separate question from immigration residency. A person can hold a Portuguese Golden Visa (immigration residency) while spending only 7 days per year in Portugal, which would not typically trigger Portuguese tax residency. However, if the same person does not establish tax residency elsewhere and maintains a habitual residence in Portugal, the Portuguese tax authorities may claim tax residency.
Americans face a unique situation: the US taxes citizens on worldwide income regardless of where they live or their tax residency. Obtaining a Golden Visa and establishing tax residency in another country does not eliminate US tax obligations. It may create obligations in both jurisdictions, though double taxation treaties and foreign tax credits can reduce the total burden.
Tax residency planning should be done with a qualified cross-border tax advisor before making any investment migration decisions.
Why It Matters for Golden Visa Applicants
Tax residency is one of the most misunderstood aspects of investment migration. Holding a Golden Visa does not automatically make you a tax resident of that country, but spending more than 183 days there (or maintaining a habitual residence) likely will. For Americans, this creates potential dual tax exposure: US worldwide taxation plus local taxation in the Golden Visa country. Double taxation treaties and foreign tax credits can reduce the overlap, but they do not eliminate it entirely. Applicants should consult a cross-border tax advisor before relocating to model the combined tax burden and determine the optimal number of days to spend in each jurisdiction.
Example
"By spending only 14 days per year in Portugal and maintaining his primary home in Texas, he held the Golden Visa without triggering Portuguese tax residency."