Article Highlights:Tax Status of Non-Resident AliensGreen Card TestSubstantial Presence TestFirst-Year ResidencyU.S. Sourced IncomeEffectively Connected Income (ECI)Fixed, Determinable, Annual, or Periodic (FDAP) IncomeIncome Subject to the 30% or Treaty WithholdingIssues Employing Non-Residents in the U.S.Issues Employing Non-Residents Working from Their Home CountryTotalization AgreementsWithholding RequirementsCommonly Used FormsNavigating the U.S. tax system can be a complex task, especially for non-resident aliens. This article aims to provide a comprehensive overview of the taxation rules applicable to non-resident aliens, including the substantial presence test, first-year residency, U.S. sourced income, effectively connected income (ECI), Fixed, Determinable, Annual, or Periodic (FDAP) income, income subject to the 30% or treaty withholding, issues related to employing non-residents, totalization agreements, and withholding requirements. Additionally, we will explain visa definitions and the taxation of individuals temporarily in the U.S.Tax Status of Non-Resident Aliens - The U.S. tax system categorizes individuals into resident aliens and non-resident aliens. Resident aliens are taxed similarly to U.S. citizens on their worldwide income, while non-resident aliens are taxed only on their U.S. sourced income and income effectively connected with a U.S. trade or business.Green Card Test – Taxpayers are considered residents, for tax purposes, if they are a Lawful Permanent Resident of the United States at any time during the calendar year. This is known as the "green card" test. They generally have this status if the U.S. Citizenship and Immigration Service (USCIS) has issued them Form I-551, also known as a "green card,” or their foreign passport bears an I-551 stamp while awaiting issuance of the actual green card. That status continues unless voluntarily renounced and abandoned or terminated by the USCIS or a U.S. federal court. Their residency starting date is the first day on which they are present in the United States as a Lawful Permanent Resident, or they choose to be taxed as a resident alien for the entire calendar year.Substantial Presence Test - The substantial presence test is a numerical formula used to determine whether an individual qualifies as a resident alien for tax purposes. To meet this test, an individual must be physically present in the U.S. for at least:31 days during the current year, and183 days during the 3-year period that includes the current year and the two years immediately before that, counting:o All the days present in the current year,o 1/3 of the days present in the first year before the current year, ando 1/6 of the days present in the second year before the current year.Example Scenario: if Eduardo spent 112 days in the U.S. in 2024, 119 days in 2023, and 136 days in 2022, he would calculate his days of presence as follows: 2024: 112 days 2023: 119 days * 1/3 = 39.67 days 2022: 136 days * 1/6 = 22.67 days Total = 112 + 39.67 + 22.67 = 174.34 daysSince Eduardo does not meet the 183-day requirement, he would be considered a non-resident alien for tax purposes for 2024.First-Year Residency - Non-resident aliens can elect to be treated as resident aliens for their first year of residency under the "First-Year Choice." This allows them to meet the substantial presence test one year earlier than usual. To qualify, the individual must:Be present in the U.S. for at least 31 consecutive days in the year of choice,Be present in the U.S. for at least 75% of the days from the start of the 31-day period to the end of the year, andMeet the substantial presence test in the following year.Example Scenario: Maria is a citizen of Brazil. She came to the United States for the first time on October 15, 2023, and stayed continuously until November 20, 2023 (37 days). She then returned to Brazil for a short visit and came back to the United States on December 5, 2023, staying for the rest of the year.Steps to Determine First-Year Residency:31-Day Requirement: Maria was present in the United States for 37 consecutive days from October 15, 2023, to November 20, 2023. This satisfies the requirement of being present for at least 31 days in a row.75% Requirement: From October 15, 2023, to December 31, 2023, there are 78 days. Maria needs to be present in the U.S. for at least 75% of these 78 days. 75% of 78 days = 58.5 days (round up to 59 days).Maria was present in the U.S. for 37 days (October 15 to November 20) + 27 days (December 5 to December 31) = 64 days. Since 64 days is more than 59 days, Maria meets the 75% requirement.Maria meets both the 31-day and 75% requirements. Therefore, she can choose to be treated as a U.S. resident for part of 2023. Her residency starting date would be October 15, 2023, the first day of her 31-day period. She will be treated as a U.S. resident for the rest of the year 2023.By making this choice, Maria will be considered a resident alien for tax purposes from October 15, 2023, through December 31, 2023, and will be taxed on her worldwide income for that period.U.S. Sourced Income - Non-resident aliens are taxed on their U.S. sourced income, which includes:Earned income (wages, salaries, etc.),Investment income (interest, dividends, etc.),Rental income from U.S. properties,Royalties from U.S. sources,Gains from the sale of U.S. real property.Effectively Connected Income (ECI) - ECI refers to income earned by a non-resident alien from conducting a trade or business within the U.S. This income is subject to U.S. income tax and must be reported on a U.S. income tax return. ECI can include:Income from the sale of goods or services,Rental income,Income from investments connected to a U.S. trade or business.Fixed, Determinable, Annual, or Periodic (FDAP) Income - FDAP income refers to U.S. source non-business income paid to a foreign person or corporation that is not ECI. This can include:Salaries, wages, premiums, and compensation for services performed in the U.S.,Other fixed or determinable annual or periodic gains, profits, and income.FDAP income is subject to a 30% (or lower treaty) tax rate. Non-resident aliens receiving only FDAP income upon which the 30% (or lower treaty) rate has been withheld are not required to file a U.S. income tax return.Income Subject to the 30% or Treaty Withholding - Non-resident aliens are subject to a 30% withholding tax on their U.S. sourced FDAP income unless a tax treaty between the U.S. and their country of residence provides for a lower rate. To claim a reduced rate or exemption under a tax treaty, non-resident aliens must file Form 8233 with their U.S. employer or withholding agent.Issues Employing Non-Residents in the U.S. - Employing non-resident aliens in the U.S. involves specific documentation and withholding requirements. Employers must ensure that non-resident aliens complete the necessary forms, such as: