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Immigration status does not by itself tell you which U.S. tax return to file. First determine your federal tax residency for the year: you may be a resident alien under the green card or substantial presence test, a nonresident alien, or a dual-status taxpayer. That result controls whether you generally file Form 1040/1040-SR, Form 1040-NR, or a combination of returns and statements. The guide below focuses on 2025 federal individual income-tax returns generally filed in 2026; always use the instructions for the tax year you are actually filing.
1. Start with the tax year and your federal tax residency
Use the tax year printed on your forms, not the year you happen to submit them. A 2025 return is generally filed in 2026. The Internal Revenue Service (IRS) explains the resident and nonresident rules in Publication 519 (2025), U.S. Tax Guide for Aliens, the 2025 Instructions for Form 1040-NR, and Topic no. 851.
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For federal income-tax purposes, an “alien” is an individual who is not a U.S. citizen or U.S. national. A person can be a noncitizen but still a resident alien for tax purposes. Conversely, having a visa or living temporarily in the United States does not automatically make someone a nonresident. Tax residency is a separate analysis from immigration classification.
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The green card test
You generally meet the green card test if you were a lawful permanent resident at any time during the year. Specific exceptions can apply, including certain treaty-based residence positions, so do not treat the green card test as absolute when a treaty or a change in status is involved.
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The 2025 substantial presence test
If you do not meet the green card test, you may still be a resident alien under the substantial presence test. For 2025, the general test requires both:
- At least 31 days physically present in the United States during 2025; and
- At least 183 weighted days over 2025, 2024, and 2023, calculated as all qualifying 2025 days, one-third of qualifying 2024 days, and one-sixth of qualifying 2023 days.
This is not a simple “183 days this year” rule. Certain days may be excluded or treated specially, and the exempt-individual rules, closer-connection exception, and treaty provisions can change the result. Keep a day-by-day travel record and read the current IRS instructions before deciding.
Why the distinction matters
Resident aliens generally follow the same federal income-tax framework as U.S. citizens and report worldwide income. Nonresident aliens generally report income connected with the United States under different sourcing, deduction, withholding, and treaty rules. A year in which your status changes can require a dual-status filing rather than a normal full-year return.
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| Tax situation | Return generally used | Income scope and key point |
|---|---|---|
| Resident alien for the full year | Form 1040 or Form 1040-SR | Generally report worldwide income and use the rules that apply to U.S. citizens, subject to any applicable treaty or special rule. |
| Nonresident alien required to file | Form 1040-NR | Report U.S.-source income and income effectively connected with a U.S. trade or business under the rules for nonresident aliens. |
| Resident for part of the year and nonresident for the other part | A main return based on your status on December 31, plus an attached statement for the other period | This is generally a dual-status return. The statement is not filed as a separate standalone return. |
Resident alien: Form 1040 or 1040-SR
A full-year resident alien generally files Form 1040 or, when eligible, Form 1040-SR. You generally include worldwide income, including income from outside the United States, and calculate tax using the ordinary individual rules. Gather foreign pay statements, bank or investment records, self-employment records, and any tax paid to another country so you can determine which schedules or credits apply. The exact treatment of foreign income depends on its type and the current-year instructions.
Nonresident alien: Form 1040-NR
A nonresident alien who has a filing obligation generally uses Form 1040-NR. Common triggers include engaging in a U.S. trade or business, having U.S.-source income for which withholding did not fully satisfy the tax, or filing to claim a refund of tax overwithheld or overpaid. The IRS summarizes these situations in Taxation of nonresident aliens and on its About Form 1040-NR page.
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Income effectively connected with a U.S. trade or business is generally reported at graduated rates after allowable deductions. Certain U.S.-source income that is not effectively connected is generally reported on Schedule NEC and may be subject to a flat rate, unless a treaty provides a lower rate. Whether an item is U.S.-source, effectively connected, deductible, or treaty-reduced depends on the income and your facts; do not apply a rate or exemption from a different situation.
Dual-status year
If you were a resident for only part of the year, use your status on the last day of the tax year to orient the filing:
- If you are a resident on December 31, generally file Form 1040 or 1040-SR as the main return and attach an unsigned Form 1040-NR labeled as a “dual-status statement” for the nonresident period.
- If you are a nonresident on December 31, generally file Form 1040-NR as the main return and attach an unsigned Form 1040 or 1040-SR statement for the resident period.
Dual-status taxpayers have important limitations, including restrictions on the standard deduction and on some filing statuses and credits. The exact allocation of income and deductions between the two periods is technical, so follow the current Publication 519 and form instructions rather than combining the year as if your status had never changed.
3. Check whether you need an SSN or an ITIN
When an SSN is available
Use your Social Security number on the return when you are eligible for one. Match the name and number to your Social Security card and to the information on wage or withholding forms. A mismatch can delay processing or a refund.
When an ITIN is needed
If you are not eligible for an SSN but need a taxpayer identification number for a federal tax purpose, apply for an Individual Taxpayer Identification Number (ITIN) with Form W-7. IRS Topic no. 857 explains the application rules. Many applicants submit Form W-7 with a federal tax return, although exceptions and other documentation routes exist.
Prepare the identity and foreign-status documents listed in the current Form W-7 instructions. The IRS requires documentation that supports both your identity and your federal tax purpose; incomplete or unacceptable documents can result in rejection. Follow the current submission method and document-certification rules rather than relying on an old checklist.
What an ITIN does not do
- An ITIN is for federal tax purposes only.
- It does not create or change immigration status.
- It does not authorize employment.
- It does not make the holder eligible for Social Security benefits.
- It does not by itself create eligibility for the earned income credit.
Do not use an ITIN when you are eligible for an SSN, and do not assume an ITIN substitutes for work authorization or an immigration document.
4. A practical filing workflow
- Identify the year. Write down the tax year, the date you are preparing the return, and the filing deadline that belongs to that year. The examples below use 2025 returns filed in 2026.
- Build a presence and status timeline. List every entry and exit date, green-card dates, visa category, student or teacher status if relevant, and any days that may be excluded under an exception. Keep passports, travel records, and immigration notices with your tax papers.
- Collect income and withholding records. Gather Forms W-2, 1099, scholarship or fellowship records, self-employment records, U.S. bank and investment statements, foreign income records, and proof of federal withholding or estimated payments. Include spouse and dependent information if you may claim them.
- Apply the residency tests. Check the green card test, then calculate the substantial presence test using the three-year weighted formula. Review closer-connection, exempt-individual, treaty, and first-year rules in the current IRS materials.
- Classify the year. Decide whether you are a full-year resident, a nonresident, or dual-status taxpayer. Record the dates for each period; those dates determine which income belongs in each part of a dual-status filing.
- Select the forms. Use Form 1040/1040-SR for a full-year resident, Form 1040-NR for a nonresident who must file, or the appropriate main return plus an unsigned statement for a dual-status year.
- Resolve identification numbers. Enter your SSN if eligible. If you need an ITIN, read the current Form W-7 instructions, assemble acceptable documents, and submit the application in the manner the IRS permits for your case.
- Apply income and treaty rules. For a nonresident, separate effectively connected income from other U.S.-source income and review Schedule NEC, Schedule OI, and any required treaty disclosure. For a resident, include worldwide income and review the forms for foreign income or foreign tax that apply to your facts.
- Check filing status and family claims. A nonresident alien generally cannot file a joint return unless a specific election or exception applies. A nonresident spouse of a U.S. citizen or resident may in some cases elect resident treatment and file jointly, but the election has requirements and can change the income reported and tax consequences.
- Calculate tax, payments, and refund. Reconcile withholding and estimated payments to the return. If tax is due, arrange payment by the applicable due date; an extension to file does not automatically extend the time to pay.
- Review signatures and attachments. Include every required schedule, treaty disclosure, ITIN package, and dual-status statement. Sign the main return as instructed. Do not sign an attached dual-status statement when the instructions require it to be unsigned.
- Submit and retain evidence. Use the filing or mailing method allowed for the form and year. Keep a complete copy of the return, schedules, identification documents, delivery confirmation, and proof of payment with your travel and income records.
5. Deadlines for 2025 returns filed in 2026
The deadline depends on your return type and circumstances. Dates can move when April 15 or June 15 falls on a weekend or legal holiday, so verify the date in the current instructions for your location and filing method.
| Filer or circumstance | General 2025-return date stated by IRS guidance | Important qualification |
|---|---|---|
| Calendar-year resident alien | April 15, 2026 | Generally the regular individual return deadline, subject to weekend and holiday adjustments. |
| Nonresident employee with wages subject to withholding, or a U.S. office or place of business | April 15, 2026 | Confirm that your facts meet the employee or U.S.-office condition. |
| Certain other nonresident filers | June 15, 2026 | This later date does not apply to every nonresident; use the Form 1040-NR instructions. |
The IRS discusses these distinctions in Topic no. 851 and Taxation of nonresident aliens. An extension generally gives additional time to file paperwork, not additional time to pay tax. Follow the applicable extension and payment instructions for the year.
6. Treaty claims and special elections
Treaty-based residence and income benefits
A U.S. income-tax treaty can change residence treatment, withholding, or the rate applied to a particular type of income. Eligibility depends on the specific treaty, your treaty-country residence, the income, documentation, and facts such as your permanent home and personal or economic connections. A visa category alone does not establish a treaty benefit.
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Some treaty positions require Form 1040-NR and Form 8833. Form 1040-NR filers may also provide treaty information on Schedule OI when applicable. The IRS explains the disclosure framework in Claiming tax treaty benefits. Read the actual treaty article and current instructions; do not claim a reduced rate or exemption simply because another immigrant from the same country qualified.
Election for a nonresident spouse
A nonresident spouse of a U.S. citizen or resident may in some circumstances elect to be treated as a resident and file jointly. This is an affirmative election with eligibility conditions and consequences, including the possibility that worldwide income becomes reportable under the resident rules. It is not automatic, and a nonresident alien generally cannot file jointly without an applicable election or exception.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.7. Common situations and how the filing changes
You arrived in the United States during the year
Arrival alone does not determine status. Calculate the substantial presence test and check whether a green card was held during the year. If your status changed, identify the exact change date and evaluate a dual-status return. Income earned before arrival may still matter, especially if you became a resident and must report worldwide income for the resident period.
You left the United States during the year
Departure does not automatically end U.S. tax residency. A green-card holder or someone meeting the substantial presence test may remain resident for part or all of the year. Keep departure dates, continuing U.S. ties, and any treaty-based position separate from the immigration decision to leave.
You worked in the United States on a temporary visa
Visa holders can be residents or nonresidents for tax purposes. Student, teacher, trainee, and similar categories can have special day-count exclusions, but the exclusion has conditions and documentation requirements. Do not simply count every day or exclude every day associated with a visa category; use the current Publication 519 and Form 1040-NR instructions.
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You earned money outside the United States
A full-year resident generally reports worldwide income. A nonresident generally reports U.S.-source and effectively connected income under the nonresident rules, but the source and connection analysis can be fact-specific. Keep foreign pay records, account statements, tax paid abroad, and currency-conversion support. If you are unsure whether an item is reportable or how it is sourced, obtain advice before filing.
You had no tax due or had withholding taken out
No balance due does not always mean no filing requirement. A nonresident may need to file to report U.S. business activity, reconcile withholding, or claim a refund of overwithheld tax. Conversely, withholding on a payment does not guarantee that the correct return was filed. Compare the filing triggers for your status with the actual amounts withheld.
8. Pitfalls that cause wrong or delayed returns
- Using immigration status as the tax answer. A visa, asylum application, green card, or recent arrival does not by itself select Form 1040 or 1040-NR.
- Using “183 days this year” as the entire test. The 2025 test uses weighted days from 2025, 2024, and 2023 and may exclude certain days.
- Reporting only U.S. wages as a resident. A resident alien generally reports worldwide income, not just income paid by a U.S. employer.
- Filing Form 1040-NR as if it were Form 1040. Nonresident sourcing, effectively connected income, Schedule NEC, deductions, credits, and treaty disclosures follow different rules.
- Ignoring a status change. A move from nonresident to resident, or the reverse, can require a dual-status return and period-by-period income allocation.
- Claiming a treaty benefit without checking the treaty article. Country of citizenship alone is not enough; treaty residence, income type, and disclosure requirements matter.
- Using an ITIN as proof of work authorization. The ITIN is a tax identifier only and does not create immigration status or employment permission.
- Assuming an extension delays payment. An extension to file generally does not extend the payment deadline.
- Submitting an incomplete ITIN package. Missing or unacceptable identity documents can delay or prevent assignment of the number.
- Choosing a preparer or software without checking capability. Confirm that the provider supports the exact IRS form, dual-status filings, treaty disclosures, ITIN workflow, language needs, privacy practices, and total cost. No provider is endorsed by the IRS materials cited here.
9. When professional help is worth the cost
Consider a qualified tax professional familiar with immigrant returns when any of these applies:
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- Your green-card and substantial-presence results conflict or include excluded days.
- You became or ceased to be a resident during the year.
- You are taking a treaty-based residence or income position.
- You have foreign business, investment, rental, self-employment, or retirement income.
- You need an ITIN and are uncertain which documents or exception apply.
- You are considering the nonresident-spouse election to file jointly.
- You received several types of U.S.-source income or had withholding that does not match your records.
- You are unsure how to allocate income, deductions, or credits in a dual-status year.
Give the preparer your travel calendar, immigration timeline, all U.S. and foreign income records, withholding statements, prior returns, treaty-country information, and family details. Ask which return will be filed, which assumptions are being used, what documents support them, and whether the quoted fee includes an ITIN application, treaty forms, or a dual-status statement.
Quick Recap
10. A final pre-submission checklist
- Correct tax year selected and current IRS instructions reviewed.
- Green-card and substantial-presence tests calculated, including weighted prior-year days.
- Exceptions, treaty positions, and first-year choices considered where relevant.
- Resident, nonresident, or dual-status classification documented.
- Form 1040/1040-SR, Form 1040-NR, or the correct dual-status combination selected.
- SSN entered, or Form W-7 and acceptable ITIN documentation prepared.
- Worldwide income included for resident periods; U.S.-source and effectively connected income classified for nonresident periods.
- Schedule NEC, Schedule OI, Form 8833, or other required schedules attached when applicable.
- Joint-return election requirements checked before filing with a nonresident spouse.
- Deadline, extension, payment, and delivery method confirmed for the specific return.
- Copies of the signed return, unsigned dual-status statement where required, schedules, documents, and payment proof retained.
IRS sources and current instructions
- IRS Publication 519 (2025), U.S. Tax Guide for Aliens
- IRS Instructions for Form 1040-NR (2025)
- IRS Topic no. 851, Resident and nonresident aliens
- IRS: Taxation of nonresident aliens
- IRS Topic no. 857, Individual taxpayer identification number (ITIN)
- IRS: About Form 1040-NR
- IRS: Claiming tax treaty benefits
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