Residential status refers to an individuals status for tax purposes, which determines how they are taxed in a particular country. The rules for determining residential status vary by country, but generally depend on the individuals physical presence in the country, citizenship, and other factors. Here are some key points to keep in mind:

• In the United States, an individual is generally considered a resident for tax purposes if they are a U.S. citizen or lawful permanent resident (i.e. "green card" holder), or if they meet the substantial presence test.
• In India, an individuals residential status is determined by their physical presence in the country during the financial year, as well as other factors such as citizenship and intention to stay in India.
• The taxability of an individual in India depends upon his residential status in India for any particular financial year. The term residential status has been coined under the income tax laws of India and must not be confused with an individual’s citizenship in India.
• The residential status of different types of persons viz an individual, a firm, a company etc is determined differently.
• The condition for deemed residential status applies only if the total income (other than foreign sources) exceeds Rs 15 lakh and nil tax liability in other countries or territories by reason of his domicile or residence or any other criteria of ... .
• In India, a person is given a special status of RESIDENT BUT NOT ORDINARILY RESIDENT (RNOR) if he satisfies one of the following conditions: 1. He is non-resident, as per the above provisions, for at least 9 out of 10... stay outside India for an uncertain period; then he becomes a Person resident outside India (non-resident) from the day he leaves India for such purpose.

In summary, residential status is an important factor in determining an individuals tax liability in a particular country, and the rules for determining it vary by country.