US Tax Residency: Status, Taxes, and Financial Planning
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20 October 2026

US Tax Residency: Features, Taxes, and Risks

What is US tax residency and how is it determined?

US tax residency is a status that defines the scope of your tax obligations to the American government. Unlike many countries where residency is often tied to citizenship or permanent domicile, the US has specific criteria that can make you a US tax resident, even if you are not a citizen or green card holder. Understanding these rules is critically important for anyone with ties to the US, whether through investments, business, or extended stays. This forms the foundation for understanding the entire US tax system.

For federal income tax purposes, if you are not a US citizen, you are generally considered a US tax resident if you meet one of two tests during a calendar year (January 1 to December 31):

  • Green Card Test (Lawful Permanent Resident Test): You become a US tax resident from the moment you are granted lawful permanent resident status in the US under immigration law. This means you have received Form I-551 (Permanent Resident Card), known as a green card. Your resident status under this test continues until it is officially revoked or you abandon it. This factor directly influences your American taxes.
  • Substantial Presence Test: This is a quantitative test that considers the number of days you spend in the US. You are considered a US tax resident if you meet the following condition: you were present in the US for at least 31 days in the current year AND the sum of days spent in the US for the current year, plus 1/3 of the days for the first preceding year, and 1/6 of the days for the second preceding year, totals at least 183 days. It is important to note that even undocumented individuals who meet this test will be treated as US tax residents.

Sometimes, it is possible to elect US tax resident status for part of a year (e.g., upon initial arrival) or, conversely, under certain conditions, be treated as a non-resident even if you meet one of the tests. For example, you can claim a closer connection to a foreign country (Closer Connection Exception) or use tax treaty tie-breaker rules. These are important aspects of US financial planning.

US Taxes: Differences for Residents and Non-Residents

The tax systems for US tax residents and non-residents differ fundamentally, making status determination critically important for financial planning. Understanding these differences helps avoid issues with the IRS.

US Tax Residents: Features and Obligations

US tax residents are taxed on their worldwide income, regardless of its source. This means that if you are a US tax resident, you must declare and pay taxes on all your income earned both within and outside the US. This includes salary, business income, investments, rent, dividends, and other types of income from any country in the world. Tax rates are progressive, and taxable income is determined in the same way as for US citizens. Residents can utilize various deductions, exemptions, and tax credits, including credits for taxes paid in other countries, to avoid US double taxation.

Nonresident Aliens: Taxation

Nonresident aliens are generally taxed only on income derived from US sources. This income is divided into two main categories:

  1. Income Effectively Connected with a US Trade or Business (ECI): This category includes income from active business activities in the US, such as salaries and business profits. This income is taxed at progressive rates similar to those applied to residents.

  2. Fixed, Determinable, Annual, or Periodical (FDAP) Income: This includes passive income such as dividends, interest, rent, and royalties received from US sources. Generally, this income is taxed at a flat 30% rate on the gross amount, unless the rate is reduced or the income is exempt under a tax treaty between the US and your country of tax residency. Deductions for such income are usually not allowed.

Tax treaties play a key role for non-residents, as they can significantly reduce the tax burden or completely exempt certain types of income. Business immigration or investments in the US require careful analysis of applicable treaties to optimize American taxes.

Common Mistakes and Non-Obvious Risks for High-Net-Worth Individuals Related to US Tax Residency

High-net-worth individuals with ties to the US often make mistakes that lead to serious tax consequences. These can be avoided by planning actions in advance and consulting with specialists in the US tax system.

1. Underestimating the Substantial Presence Test

Many mistakenly believe that if they do not have a green card or US citizenship, they cannot be US tax residents. However, the Substantial Presence Test can ‘make’ you a US tax resident, even if you spend relatively little time in the US over several consecutive years. For example, if you frequently visit the US for business, leisure, or to visit family, you might unknowingly accumulate enough days.

Risk: Unawareness of this rule leads to failure to file tax returns, non-payment of taxes on worldwide income, and consequently, penalties, interest, and future immigration status problems. The IRS has access to entry/exit data and can easily identify discrepancies.

2. Ignoring Controlled Foreign Corporation (CFC) Rules

If a US tax resident owns 10% or more of the shares of a foreign company, or if US persons collectively own more than 50% of the shares of a foreign company, such a company may be considered a Controlled Foreign Corporation (CFC). CFC rules are very complex and require annual reporting (Form 5471) and, in some cases, payment of taxes on undistributed CFC profits.

Risk: Non-compliance with CFC rules leads to enormous penalties (starting from $10,000 for each unfiled form), which can amount to hundreds of thousands of dollars, as well as the possibility of criminal prosecution. This significantly impacts US financial planning.

3. Misunderstanding Tax Treaties and US Double Taxation

Although tax treaties can help avoid US double taxation and alter residency status, their application has nuances. Incorrect interpretation or inability to properly invoke treaty provisions can lead to incorrect tax calculations.

Risk: Incorrect application of treaties can result in paying taxes in both the US and another country, or conversely, failing to pay taxes where obligated, leading to claims from tax authorities.

4. Lack of Planning When Obtaining a Green Card and Taxes

The moment of obtaining a green card is critical. From this point, you become a US tax resident, and your worldwide income is subject to American taxes. If you have significant assets outside the US (real estate, business, investment portfolios), their structure should be optimized before obtaining status. Green card and taxes are closely linked.

Risk: Unprepared green card acquisition can lead to a significant increase in the tax burden on existing assets and income, as well as complexities in reporting them. For example, issues may arise with real estate abroad.

5. Incorrect Reporting of Foreign Accounts and Assets

US tax residents are required to report their foreign financial accounts (FBAR, FinCEN Form 114) and certain foreign assets (Form 8938, FATCA) if their value exceeds established thresholds. This applies to those who are US tax residents.

Risk: Failure to file or incorrect filing of these forms carries very high penalties, which can reach $10,000 per violation (for FBAR) or even 50% of the maximum account balance for the year in case of willful non-compliance. For FATCA, penalties are also significant.

6. Errors in Relocation and Expatriation

The process of moving to the US or, conversely, renouncing US tax resident status (expatriation) requires careful tax planning. This is especially true for the ‘expatriation tax’ for high-net-worth individuals renouncing citizenship or a green card.

Risk: Improper expatriation procedures or lack of planning during relocation can lead to unforeseen tax liabilities and missed optimization opportunities.

Strategies for Minimizing Risks and Optimizing American Taxes

For high-net-worth individuals facing American taxes, there are several strategies to minimize risks and optimize the tax burden:

  1. Pre-tax Planning: Before obtaining a green card or before you begin spending significant time in the US, it is necessary to conduct a comprehensive analysis of your assets, income, and liabilities. This will allow you to restructure assets, sell those that may create tax problems, or transfer them to more suitable structures. This is a key element of US financial planning.

  2. Utilizing Tax Treaties: Careful study and correct application of tax treaty provisions can significantly reduce the tax burden on certain types of income, and also help determine tax residency status in cases of dual residency. This is especially important for avoiding US double taxation.

  3. Creating Appropriate Legal Structures: Various legal structures (trusts, foundations, companies) can be used for owning foreign assets and conducting business, which, with proper planning, can provide tax efficiency and asset protection. However, it is important to remember that US tax law has very strict rules for foreign trusts and companies owned or controlled by US tax residents.

  4. Regular Monitoring and Consultations: US tax law is constantly changing. It is important to regularly consult with qualified tax professionals experienced in international taxation and high-net-worth clients. This will help you adapt to changes in a timely manner and avoid errors within the US tax system.

  5. Conscious Approach to ‘Dual Citizenship’ and ‘Dual Residency’: If you hold citizenship or residency in two countries, you need to understand how this affects your tax obligations in the US. Citizenship by investment or residency in other countries does not negate US tax obligations if you are a US tax resident.

Conclusion

US tax residency is not just a formality but a key factor determining your financial life if you have ties to this country. Underestimating the complexity of the American tax system and ignoring its requirements can lead to serious financial losses and legal problems. For high-net-worth individuals, proactive US financial planning and continuous collaboration with experienced tax consultants specializing in international taxation are especially important. This is the only way to effectively manage your assets, minimize risks, and ensure compliance with all IRS requirements in 2026 and beyond, avoiding issues with US taxes.

FAQ: Frequently Asked Questions About US Tax Residency

What is the main difference between a US tax resident and a non-resident?

The main difference lies in the scope of taxation. A US tax resident is taxed on their worldwide income, meaning all income earned anywhere in the world. A US non-resident is generally taxed only on income derived from US sources.

Can I be a US tax resident without a green card or citizenship?

Yes, you can become a US tax resident if you meet the Substantial Presence Test. This test is based on the number of days you spend in the US during the current and two preceding years. Even without a green card, you can be considered a US tax resident.

What is the ‘Closer Connection Exception’ and how can it help?

The ‘Closer Connection Exception’ allows you, under certain conditions, to be treated as a US non-resident even if you meet the Substantial Presence Test. To do this, you must be in the US for less than 183 days in the current year, have a tax home in a foreign country, and prove that you have a closer connection to that foreign country than to the US. This is an important tool for optimizing tax residency.

What are the main risks for high-net-worth individuals ignoring US tax residency rules?

The main risks include: large penalties for failure to file tax returns and forms (e.g., FBAR, CFC forms), non-payment of taxes on worldwide income, immigration status problems, and potential criminal prosecution in cases of willful tax evasion. Non-compliance can lead to serious consequences with American taxes.

How do tax treaties affect my US tax residency?

Tax treaties between the US and other countries may contain ‘tie-breaker rules’. If you are a resident of both countries under their domestic laws, these rules help determine which country’s resident you will be considered for the purposes of applying that treaty, which can affect your US tax obligations and help avoid double taxation.

How does a green card affect US tax residency?

Obtaining a green card automatically makes you a US tax resident from the date it is issued. This means that from that moment, you are obligated to declare and pay American taxes on all your worldwide income, regardless of where it was earned.

What are the consequences of ignoring US tax system requirements?

Ignoring US tax system requirements can lead to severe penalties, interest accrual, IRS audits, and in some cases, even criminal prosecution. This can affect both financial planning and immigration status.

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