Who Is a Nonresident Alien in the US? Definition and Tax Implications Explained

Learn who qualifies as a nonresident alien in the US and understand the tax rules that apply to these individuals based on residency tests.

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A nonresident alien in the US is an individual who is not a US citizen or a resident alien. A nonresident is classified based on the lack of passing the green card test or substantial presence test in a calendar year. These individuals typically are in the US for a short duration and may be subject to US income tax only on their US-source income.

FAQs & Answers

  1. What is the difference between a nonresident alien and a resident alien? A nonresident alien is someone who does not pass the green card or substantial presence tests and is taxed only on US-source income, while a resident alien meets one of these tests and is taxed on worldwide income.
  2. How is the substantial presence test calculated? The substantial presence test counts the days an individual is physically present in the US over the current and two previous years, usually requiring 183 days to be considered a resident alien.
  3. Are nonresident aliens required to file US income tax returns? Nonresident aliens must file US income tax returns if they have US-source income or are engaged in a trade or business in the US.

Watch More

For a deeper understanding of US residency status and tax responsibilities, explore related videos on resident aliens, green card holders, and how to determine your tax filing obligations as a foreign national in the US.

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