To obtain tax residency in USA, an individual must satisfy one of two statutory tests under the Internal Revenue Code: the Green Card Test or the Substantial Presence Test. Meeting either test triggers full US tax obligations on worldwide income, so understanding the mechanics before you trigger residency - or before you try to establish it deliberately - is essential. This guide walks through each test, the filing steps that follow, the costs involved, common mistakes made by foreign nationals, and the ongoing compliance obligations that come with US tax resident status.
US tax residency is a legal status determined entirely by federal tax law, not by immigration status alone. A person can be a US tax resident without being a permanent resident for immigration purposes, and vice versa. The Internal Revenue Service (IRS) is the federal authority responsible for administering income tax obligations, and it applies two distinct tests to determine whether a foreign national qualifies as a resident alien for tax purposes.
The Green Card Test applies automatically to any individual who holds a lawful permanent resident (LPR) card - commonly called a green card - at any point during the calendar year. Residency begins on the first day the individual is physically present in the US as a green card holder. It ends only when the green card is formally abandoned or revoked, which requires a specific legal procedure.
The Substantial Presence Test (SPT) is a day-count formula. An individual meets the SPT if they are present in the US for at least 31 days during the current year and for a total of 183 days over a rolling three-year period, calculated using a weighted formula: all days in the current year, one-third of days in the prior year, and one-sixth of days in the year before that. Both tests are codified in Internal Revenue Code Section 7701(b).
It is worth noting that US tax residency is not a programme one applies to join. It is a status that arises by operation of law when the statutory conditions are met. Foreign entrepreneurs and executives who spend significant time in the US often trigger the SPT without realising it, which is one of the most common and costly surprises in international tax planning.
Once an individual meets the Green Card Test or the SPT, the practical steps to formalise their status and comply with US tax law follow a clear sequence.
Determine your first day of residency. Under the Green Card Test, residency begins on the first day of physical presence as an LPR. Under the SPT, residency begins on the first day of presence in the US during the year in which the test is met - unless the individual qualifies for the first-year election under IRC Section 7701(b)(4), which can shift the start date to an earlier point in the year if certain conditions are met.
Obtain a Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN). Every US tax resident must have a federal taxpayer identification number. An SSN is issued by the Social Security Administration and is available to individuals authorised to work in the US. Those not eligible for an SSN must apply for an ITIN using IRS Form W-7. Processing an ITIN application typically takes six to ten weeks.
File Form 1040 for the year residency begins. Resident aliens file the same federal income tax return as US citizens - Form 1040. For the year in which residency begins, the return is typically a "dual-status" return covering the non-resident period and the resident period separately. Dual-status returns are more complex than standard returns and almost always require professional assistance.
Report foreign financial accounts and assets. US tax residents who hold foreign bank accounts with aggregate balances exceeding a specified threshold must file a Report of Foreign Bank and Financial Accounts (FBAR) with the Financial Crimes Enforcement Network (FinCEN). Separately, those with significant foreign financial assets must attach IRS Form 8938 (Statement of Specified Foreign Financial Assets) to their Form 1040 under the Foreign Account Tax Compliance Act (FATCA). These are two distinct obligations with different thresholds and different filing authorities.
Register for state income tax where applicable. The US has no single state tax system. Most states impose their own income tax, and each state has its own residency rules. Some states - such as California and New York - apply aggressive residency tests that can result in state tax liability even for individuals who spend only part of the year there. Determining state tax residency is a separate analysis from federal residency.
Understand estimated tax payment obligations. US tax residents who expect to owe federal tax above a modest threshold are required to make quarterly estimated tax payments using IRS Form 1040-ES. Failure to pay sufficient estimated taxes results in an underpayment penalty. The quarterly deadlines fall in April, June, September, and January of the following year.
The documentation required depends on the basis for residency and the individual';s personal financial situation. The following items are commonly needed.
A common mistake made by foreign nationals is assuming that only US-source income must be reported. Once resident alien status is established, the IRS taxes worldwide income on the same basis as US citizens. Failing to report foreign income - even income that was taxed in another country - is a serious compliance error that can result in substantial penalties and interest.
In practice, founders and executives relocating to the US should begin gathering foreign financial records at least three months before their anticipated residency start date. Many underestimate the volume of documentation required for the first-year return, particularly when foreign entities, trusts, or investment accounts are involved.
If you are unsure whether your presence in the US has already triggered residency, or if you need help structuring your entry to manage the timing of residency, contact info@vlolawfirm.com. We can help structure the setup correctly the first time.
The timeline for completing the initial compliance steps after residency begins depends on the complexity of the individual';s financial situation and the filing deadlines that apply.
The federal income tax return for a given calendar year is due on 15 April of the following year. An automatic six-month extension to 15 October is available by filing IRS Form 4868, but this extends only the filing deadline, not the payment deadline. Tax owed must still be estimated and paid by the original April deadline to avoid interest and penalties.
FBAR filings are due on 15 April, with an automatic extension to 15 October. Form 8938 is filed with the annual tax return and follows the same deadline. For individuals who discover they should have filed FBARs in prior years, the IRS offers the Streamlined Filing Compliance Procedures, a voluntary disclosure programme that allows late filers to come into compliance with reduced penalties.
On the cost side, professional fees for preparing a first-year dual-status return with foreign income and FBAR obligations typically start from the low thousands of USD and can rise significantly for individuals with complex structures. ITIN applications, if handled by a Certified Acceptance Agent, carry a modest professional fee. State tax return preparation adds further cost depending on the states involved.
Hidden costs that surface later include the ongoing annual cost of maintaining compliance - federal and state returns, FBARs, and potentially Form 5471 (for US persons with interests in foreign corporations) or Form 3520 (for foreign trusts and gifts). These forms carry steep standalone penalties for late or incorrect filing, sometimes in the tens of thousands of USD per violation, regardless of whether any tax is owed.
Scenario one: A German entrepreneur who spends four months per year in the US for three consecutive years may trigger the SPT without intending to establish US tax residency. Once triggered, they face an obligation to report worldwide income, including German business profits, to the IRS. The US-Germany tax treaty may provide relief, but treaty benefits must be claimed proactively on the tax return.
Scenario two: A Brazilian executive who receives a green card and relocates to New York must file both a federal return and a New York State return. New York applies its own residency rules and has historically been aggressive in auditing individuals who claim to have changed their domicile away from the state. Establishing a clean break from New York residency requires careful documentation of the change in domicile.
Not every individual who meets the day-count formula under the SPT becomes a US tax resident. Several statutory exceptions and treaty provisions can override or limit the effect of the test.
The Exempt Individual exception excludes certain categories of people from the day count entirely. Foreign government employees on A or G visas, teachers and trainees on J or Q visas for a limited period, and students on F, J, M, or Q visas for a limited period do not count their days of presence for SPT purposes under IRC Section 7701(b)(5). This is a significant carve-out for academics and sponsored trainees.
The Closer Connection Exception under IRC Section 7701(b)(3)(B) allows an individual who meets the 183-day threshold in the current year to avoid resident alien status if they were present for fewer than 183 days in the current year, maintained a tax home in a foreign country, and had a closer connection to that foreign country than to the US. This exception must be claimed by filing IRS Form 8840 (Closer Connection Exception Statement for Aliens) by the due date of the tax return.
Tax treaties between the US and many countries contain "tie-breaker" provisions that allow an individual who qualifies as a resident of both the US and the treaty partner country to be treated as a resident of only one country for treaty purposes. Claiming treaty benefits to override US tax residency requires filing IRS Form 8833 (Treaty-Based Return Position Disclosure) and may result in the individual being treated as a non-resident alien for US tax purposes, which has its own set of consequences.
A non-obvious requirement is that claiming a treaty tie-breaker position does not eliminate all US filing obligations. The individual may still need to file a US non-resident return (Form 1040-NR) and report US-source income, and they lose access to certain deductions and credits available only to resident aliens.
Obtaining US tax residency is not a one-time event. It creates a recurring annual compliance cycle that continues until residency is formally terminated.
Annual federal and state income tax returns must be filed for every year of residency. The federal return covers worldwide income, and foreign tax credits under IRC Section 901 or the foreign earned income exclusion under IRC Section 911 (for those living abroad) may reduce double taxation, but neither eliminates the filing obligation.
FBAR and Form 8938 filings must be made annually if the relevant thresholds are met. The FBAR threshold is an aggregate foreign account balance exceeding a specified amount at any point during the year. The Form 8938 thresholds are higher and vary depending on whether the individual files jointly and whether they live inside or outside the US.
Individuals with ownership interests in foreign corporations may be required to file Form 5471, which is one of the most complex information returns in the US tax system. Those who receive large gifts or inheritances from foreign persons must file Form 3520. Both forms carry significant penalties for non-compliance.
Terminating US tax residency also requires deliberate action. A green card holder who wishes to cease being a US tax resident must formally abandon the green card through immigration channels and may be subject to the expatriation tax rules under IRC Section 877A if they meet certain net worth or tax liability thresholds. An individual who was a resident under the SPT simply stops being a resident when they no longer meet the test, but they may need to file Form 8854 if the expatriation rules apply.
In practice, founders should consider building the annual compliance cost into their financial planning from the moment residency begins. Many underestimate the cumulative cost of maintaining compliance across multiple years, particularly when foreign business interests are involved.
To discuss your specific situation and ensure your compliance obligations are properly managed, contact info@vlolawfirm.com. We can assist with documents and filings across the full compliance cycle.
What is the biggest practical risk for a foreign national who accidentally triggers US tax residency?
The most significant risk is failing to report worldwide income in the year residency is triggered, which can result in substantial back taxes, interest, and accuracy-related penalties. The IRS has broad information-sharing agreements with foreign tax authorities and financial institutions under FATCA, which means unreported foreign income is increasingly detectable. In addition, failure to file FBARs for foreign accounts carries civil penalties that can reach a significant percentage of the account balance per violation. Foreign nationals who discover they triggered residency in a prior year should seek professional advice promptly and consider using the IRS Streamlined Filing Compliance Procedures to come into compliance with reduced penalties before the IRS identifies the issue independently.
How long does it take to complete the first-year filing process, and what does it cost?
The first-year dual-status return is typically prepared and filed within two to four months of the tax year end, assuming all foreign income records are available. Gathering foreign financial documentation - particularly for individuals with business interests, trusts, or multiple accounts in multiple countries - is usually the longest part of the process. Professional fees for a first-year return with foreign complexity start from the low thousands of USD and can rise considerably for individuals with foreign corporate structures or trusts. State returns add further cost. The ITIN application, if needed, adds six to ten weeks to the timeline and should be started as early as possible.
Can a foreign national choose not to become a US tax resident even if they meet the Substantial Presence Test?
Yes, in certain circumstances. The Closer Connection Exception under IRC Section 7701(b)(3)(B) allows an individual who meets the day-count formula but was present for fewer than 183 days in the current year to avoid resident alien status by demonstrating a closer connection to a foreign country. This exception must be claimed proactively on IRS Form 8840. Separately, a tax treaty tie-breaker provision may override the SPT result if the individual qualifies as a resident of a treaty partner country under that treaty';s tie-breaker rules. Neither option is automatic - both require timely filing and careful documentation. Individuals who believe they may qualify for an exception should seek professional advice before the filing deadline for the relevant year.
Obtaining US tax residency triggers one of the most comprehensive tax reporting regimes in the world, covering worldwide income, foreign accounts, and foreign assets. The process is governed by clear statutory rules under the Internal Revenue Code, but the compliance obligations that follow are complex, recurring, and carry significant penalties for errors or omissions. Planning ahead - before residency is triggered - is far more cost-effective than remedying problems after the fact.
VLO Law Firms advises international clients on obtaining and managing tax residency in the USA. We can assist with residency analysis, first-year filings, FBAR and FATCA compliance, treaty position claims, and ongoing annual obligations. To request a consultation, contact: info@vlolawfirm.com