Nonresident Tax Filing Guide for U.S. Returns

A visa status does not automatically determine how you file a U.S. tax return. A student, researcher, visiting professional, business owner, or investor may be treated as a nonresident alien for federal tax purposes even while living and working in the United States. This nonresident tax filing guide explains the decisions and documents that usually matter before a return is prepared.

The central question is not simply whether you are a U.S. citizen or green card holder. It is whether you are a resident or nonresident for tax purposes during the specific year. That determination affects the return you file, the income you report, available deductions, treaty benefits, and potentially your New York filing obligations.

Start With Your U.S. Tax Residency Status

For federal tax purposes, many people become residents through either the green card test or the substantial presence test. If you were a lawful permanent resident at any time during the year, you generally meet the green card test. The substantial presence test looks at the number of days you were physically present in the United States over a three-year period.

Under that test, you generally count all days present in the current year, one-third of the days from the prior year, and one-sixth of the days from the second prior year. If the total reaches 183 days and you were present at least 31 days in the current year, you may be a resident alien for tax purposes.

There are meaningful exceptions. Certain students, teachers, trainees, diplomats, and people temporarily unable to leave the country may exclude days from the calculation. For example, an F-1 student may be an "exempt individual" for purposes of counting days, even though the student is not exempt from paying tax. The wording is confusing, but the distinction matters.

A person can also be a dual-status taxpayer when residency changes during the year. Dual-status returns require careful handling because different rules may apply to income earned before and after the residency change date. Do not assume that filing a standard resident return is simpler or correct.

Nonresident Tax Filing Guide: Which Return Applies?

Most nonresident aliens who are required to file use Form 1040-NR, U.S. Nonresident Alien Income Tax Return. The form is designed to report income that is taxable to a nonresident, including wages from U.S. employment, self-employment income connected with a U.S. trade or business, scholarship income, and certain investment income.

Some individuals must also file Form 8843, Statement for Exempt Individuals and Individuals With a Medical Condition. This form is common for international students, teachers, researchers, and trainees who are excluding days of presence from the substantial presence test. In some cases, Form 8843 is required even when the individual had no income and does not otherwise need to file a federal income tax return.

A married nonresident generally cannot use the same filing choices available to U.S. residents. Joint filing is limited, although elections may be available in specific situations, such as when one spouse is a U.S. citizen or resident. Rules for claiming dependents are also narrower for nonresidents, with limited exceptions involving residents of Canada, Mexico, South Korea, and U.S. nationals.

If you do not have a Social Security number but need to file, claim a treaty benefit, or receive a refund, an Individual Taxpayer Identification Number may be necessary. Applying for an ITIN often involves Form W-7 and original or certified identity documents. Timing and documentation are especially important when an ITIN application is submitted with an initial tax return.

Know Which Income Is Taxable

Nonresident tax rules separate income into two broad categories: income effectively connected with a U.S. trade or business, and fixed, determinable, annual, or periodic income, often called FDAP income.

Effectively connected income commonly includes wages earned for services performed in the United States and income from a U.S. business or self-employment activity. It is generally taxed at graduated rates, and qualifying business deductions may be available. A consulting engagement, freelance work, or local business activity can create filing requirements even when payments come from outside the United States.

FDAP income can include interest, dividends, rents, royalties, scholarships, and certain other passive income. It is often subject to a flat 30% withholding rate unless a tax treaty or another rule reduces the rate. The correct treatment depends on the type of income, where services were performed, the payer, and whether the income is connected to a U.S. business.

This is one area where paperwork tells only part of the story. A Form 1099 may show the amount paid, but it does not always establish the correct tax classification. Similarly, income earned remotely may require a closer look at where the services were physically performed and whether the activity was connected to the United States.

Review Tax Treaty Benefits Carefully

The United States has income tax treaties with many countries. A treaty may reduce withholding on dividends, exempt certain scholarship or teaching income, or provide limited benefits for students, trainees, researchers, and employees. Treaty benefits are not automatic simply because you are a citizen or resident of a treaty country.

Eligibility can depend on your immigration classification, the length and purpose of your U.S. stay, your prior visits, the type of income, and whether you remain a tax resident of the other country. Some treaty positions must be disclosed on Form 8833, while others are reported directly on the return or supported by withholding forms.

A common mistake is claiming a treaty benefit based on a prior year's facts. A student or researcher may qualify during an initial period in the United States but lose the benefit after a specified number of years. Reviewing the exact treaty article and your timeline before filing can prevent a costly correction later.

Gather Records Before Preparing the Return

Accurate filing begins with a complete record of income, presence in the United States, and withholding. Keep copies of your passport, visa documents, entry and exit history, and prior federal and state returns. These records support both residency determinations and treaty claims.

Your tax documents may include Forms W-2, 1042-S, 1099, 1098-T, 1095, K-1, and statements showing investment income or foreign income. Form 1042-S deserves special attention because it reports certain payments to foreign persons, including scholarship income and treaty-exempt wages. It can also show federal tax withheld that should be claimed on your return.

For business or self-employment income, retain invoices, payment records, expense receipts, mileage logs, and details about where services were performed. If you received income from outside the United States, provide the source, amount, dates, and connection to any U.S. activity. Clear records make it easier to identify what belongs on the return and what does not.

Do Not Overlook New York Filing Requirements

Federal nonresident status does not automatically settle your New York tax status. New York has its own residency rules and may tax income sourced to New York, including wages for work performed in the state and income from a New York business. A nonresident may need to file a New York return even when the federal return is Form 1040-NR.

For Broome County residents and local employers, this frequently arises when an international employee works in Vestal, Binghamton, or another nearby community while maintaining a permanent home elsewhere. Remote work, temporary assignments, and moves during the year can add complexity. State residency, domicile, and source-of-income questions should be evaluated separately from federal rules.

Plan Around Filing and Payment Deadlines

A nonresident return is generally due April 15 when you received wages subject to U.S. withholding. If you did not receive wages subject to withholding, the filing deadline is generally June 15. However, any tax owed is still generally due by April 15, and interest can begin accruing after that date.

An extension gives additional time to file, not additional time to pay. Filing on time with incomplete residency information or unsupported treaty claims can create more work than requesting an extension and preparing the return correctly.

Nonresident filings are often manageable once the facts are organized, but they are rarely one-size-fits-all. Burkin's Tax & Accounting can help taxpayers review residency status, income documents, treaty questions, and New York obligations so the return reflects the facts of their situation. A timely conversation before filing season becomes urgent can provide the clarity needed to move forward with confidence.