Alien Definition

An alien is any individual within the country’s borders, who is not a U.S. citizen, is called an alien.

Extended Definition
The term ‘alien’ can be used in reference to any person within the country’s borders who is not a U.S. citizen. Aliens are classified into two broad categories:

1. Non-resident aliens
2. Resident aliens

According to the IRS, a non-resident is someone who does not meet either the substantial presence test or the green card test (e.g., people who newly arrive in the country).

Individuals who meet either the substantial presence test (physical presence in the country for over 31 days in a year and 183 days in three years) or the green card test are called residents.

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Last Updated By

Rachel Blakely-Gray | Jun 12, 2023