Form 1040 vs 1040-NR: how to choose the correct tax form
Not sure whether to file Form 1040 or 1040-NR? It comes down to your tax residency, and the IRS rules are more nuanced than they appear at first glance. Whether you're filing for the 2025 tax year in early 2026 or planning ahead for 2026, understanding your residency status is essential to choosing the correct form and avoiding costly mistakes.
This guide walks you through who should file which form and how to determine your residency status using the green card test, the substantial presence test, and applicable treaty provisions. Whether you're an international student, visa holder, green card applicant, or US citizen living abroad, you'll find exactly what you need to file correctly.
Key takeaways
- US citizens and most green card holders file Form 1040 and report worldwide income. Exceptions apply if a treaty tiebreaker or formal abandonment changes their US tax status.
- Nonresident aliens file Form 1040-NR and report only US-sourced income.
- Tax residency is determined by the green card test or the substantial presence test (often called the 183-day rule).
- For a dual-status year, the form you file depends on your status on December 31: resident on the last day means Form 1040 or 1040-SR with a Dual-Status Statement; nonresident on the last day means Form 1040-NR with a Dual-Status Statement
- Form 1040 is due April 15, 2026; US citizens and resident aliens living abroad get an automatic extension to June 15, 2026. Form 1040-NR is due April 15 if you had wages subject to US withholding, or June 15 if you did not.
For a deeper breakdown of resident vs. nonresident classifications, see our guide on how to define your US alien tax status.
Form 1040 or Form 1040-NR: key differences explained
The IRS uses two different tax forms depending on your residency status: Form 1040 for US tax residents and Form 1040-NR for nonresidents.
Form 1040 is generally for US tax residents and reports worldwide income. Form 1040-NR is for nonresidents and generally covers US-source income plus any income effectively connected with a US trade or business
Below is a quick comparison to help you understand the core differences:
| Form 1040 (resident alien) | Form 1040-NR (nonresident alien) | |
|---|---|---|
| Who files | Generally, US citizens, green card holders, dual-status aliens, and those who pass the substantial presence test | Nonresident aliens who earned US-sourced income, dual-status aliens |
| Filing status options | Single, married filing jointly, married filing separately, head of household, qualifying widow(er) | Single, married filing separately, or qualifying surviving spouse (with exceptions) |
| Income taxed | Worldwide income must be reported and taxed | US-source income and income effectively connected with a US trade or business |
| Standard deduction | Yes | Generally no (with exceptions) |
| Dependents | Can generally claim qualifying dependents | Can claim only if covered by tax treaty (with conditions) |
| Tax credits | Eligible for a range of credits | Limited credit eligibility |
NOTE! Dual-status aliens file Form 1040 if they are US residents on December 31, or Form 1040-NR if they are nonresidents on December 31, with a Dual-Status Statement attached.
Filing statuses and dependents
Residents filing Form 1040 can choose from all five standard tax statuses. Nonresident aliens filing Form 1040-NR are generally limited to single, married filing separately, or a qualifying surviving spouse. This restriction alone can cost thousands of dollars in lost deductions for filers whose spouses do not have US tax status.
A married nonresident alien can elect with a US citizen or resident-alien spouse to file a joint Form 1040 for the year of the election, subject to the IRS election rules (IRC § 6013(g)). Some treaty provisions allow additional flexibility depending on the country of residence.
On Form 1040-NR, dependent claims are limited. Residents of Canada or Mexico and US nationals generally use the same dependent rules as US citizens. South Korea has a child-only treaty rule, and Indian students or business apprentices may claim dependents under Article 21(2) of the US–India tax treaty.
Dependents must have an SSN or ITIN, even under treaty rules. If your dependent has neither, you'll need to file Form W-7 to apply for an ITIN before claiming them.
Note that under the Tax Cuts and Jobs Act (TCJA), personal exemptions remain suspended at $0 for both 2025 and 2026 (IRC § 151(d)(5)). The Credit for Other Dependents ($500 per qualifying dependent) and the Child Tax Credit ($2,200 per qualifying child for 2025) remain valuable for filers who qualify.
Standard deduction and credits
For the 2025 tax year (filed in 2026), the standard deduction for Single filers is $15,750. For the 2026 tax year, the amount rises to $16,100 (Rev. Proc. 2025-32).
Form 1040-NR filers generally cannot claim the standard deduction. The main exception applies to students and business apprentices from India, who can claim it under Article 21(2) of the US–India tax treaty.
Most tax credits are unavailable to Form 1040-NR filers, including the earned income credit and the American opportunity credit. In rare cases, education benefits may apply under a treaty.
A few exceptions exist for nonresidents. The child tax credit applies in certain situations, and the foreign tax credit is available if you pay tax to a foreign government on foreign-sourced income that is also taxed by the US.
Read more in our comprehensive guide to the foreign tax credit for US taxpayers.
Tax treaties and income types
Tax treaties matter most for Form 1040-NR filers. They can reduce or eliminate US withholding on wages, scholarships, pensions, and certain business income. The US has income tax treaties with more than 60 foreign countries, and the specific benefits vary significantly by country. The IRS treaty tables list current treaty partners and effective dates.
You may need to attach Form 8833 when a treaty position changes your tax result. In many cases, the form is required unless an exception applies (IRC § 6114).
Example 1: A French researcher temporarily working at a US university under a J-1 visa in 2025 may exclude part or all of their compensation from US tax by claiming benefits under Article 20(1) of the US–France tax treaty. This provision provides an exemption for teaching and research income for a period not exceeding two years.
Example 2: A Canadian nonresident alien earning US-sourced income in 2025 may be eligible to claim dependents on Form 1040-NR under Article XXIV(2) of the US–Canada tax treaty. This article allows residents of Canada to claim the same dependent credits (formerly personal exemptions) as US residents, provided support and residency conditions are met.
How to determine your residency status for tax purposes
Two tests decide whether you're a US tax resident: the substantial presence test and the green card test. Passing either one in a calendar year generally makes you a resident for that year (IRC § 7701(b)).
Substantial presence test
You pass the substantial presence test if you were physically present in the US for at least 31 days in the current year and 183 days or more across the last three years on a weighted basis. This is often called the 183-day rule.
For the 2025 tax year (filed in 2026), the weighted formula works like this:
- All your US days in 2025
- One-third of your US days in 2024
- One-sixth of your US days in 2023
Add them up. If the total reaches 183 days and you spent at least 31 days in the US in 2025, you're a tax resident and file Form 1040.
Precise day counting matters for the 2026 filing season. Even a handful of extra US days in 2025 can tip you over the threshold and pull your worldwide income into US taxation.
Some people don't count their days at all. The main exempt groups are F-1, J-1, M, and Q visa holders (for a limited number of years), diplomats and employees of international organizations, and anyone unable to leave the US due to a medical condition that arose while they were in the US.
Note that a medical problem alone does not automatically make those days exempt; the IRS medical-condition rules must be met.
If you're a Canadian snowbird or in a similar situation, you may still claim nonresident status through the Closer Connection Exception. You qualify if you spent fewer than 183 days in the US in the current year, kept your tax home abroad, and have closer ties to that country than to the US. You claim it by filing Form 8840.
Want to skip the math? Try our substantial presence test calculator.
Green card test
You meet the green card test if you are a lawful permanent resident at any time during the year. Your residency start date is generally the first day you are present in the US as a lawful permanent resident (IRC § 7701(b)(1)(A)(i)). Once you hold a green card, you're treated as a US tax resident for the rest of that year, and every year you keep that status.
If your green card status started partway through the year, you may file Form 1040 for the resident portion and attach a Form 1040-NR statement covering the months before you arrived.
For more, see our tax guide for green card holders.
Dual-status filers
You're a Dual-status alien if you were both a US resident and a nonresident in the same tax year. This usually happens the year you move to or leave the US.
Example: You arrive in the US on an H-1B visa in June 2025 and pass the substantial presence test by October. You're a nonresident alien from January through May and a resident from June onward.
For a dual-status year, the form you file depends on your status on December 31: resident on the last day means Form 1040 or 1040-SR with a Dual-Status Statement; nonresident on the last day means Form 1040-NR with a Dual-Status Statement. You generally cannot file jointly or claim the standard deduction, and treaty benefits are limited.
Dual-status returns must be mailed. The IRS does not currently support e-filing for this filing type.
For step-by-step instructions, see our complete guide on filing US tax returns for dual-status aliens.
Dual-status filing is one of the more error-prone areas of expat tax work. Reporting the wrong income in the wrong part of the return is a common mistake, and it can trigger IRS scrutiny.
Form 1040 and Form 1040-NR: which one should you file? Real-life examples
Choosing the right form depends on your tax residency status and the type of income you earned, not your immigration status. Even temporary visa holders can be tax residents. It comes down to days of presence and the other IRS criteria covered above.
Here are six common situations and how each one is filed for the 2025 tax year.
1. US citizen living abroad
A US citizen residing in the UK and earning foreign income must still file Form 1040 and report worldwide income.
2. Green card holder
Someone who obtained a green card in March 2025 becomes a US tax resident from that date forward. They file Form 1040, even if they left the US later that year.
3. Returning US resident after years abroad
A person who truly changes from nonresident to resident midyear can be a dual-status filer. A continuing green card holder who returns to the US is usually not a nonresident before re-entry; dual-status treatment applies only if resident status actually changed during the year.
4. Dual-status filer
A J-1 teacher who switched to an H-1B visa mid-year in 2025 is a dual-status filer. The form depends on their status on December 31: Form 1040 or 1040-SR if resident, or Form 1040-NR if nonresident, with a Dual-Status Statement attached in either case. The exact split depends on visa dates and physical presence in the US.
5. F-1 visa student
An international student who arrived in 2021 and is still studying in 2025 is likely in their fifth calendar year on an F-1 visa. They probably still qualify for nonresident alien status and file Form 1040-NR. F-1 visa holders are generally exempt from the substantial presence test for up to five calendar years.
6. H-1B visa worker
A software engineer on an H-1B visa who worked in the US for 220 days in 2025 meets the substantial presence test. They file Form 1040 as a US tax resident.
If you're unsure which form fits your situation, refer to IRS Publication 519 for a full breakdown of residency tests and exceptions. You can also use our substantial presence test calculator for a quick answer based on your days in the US.
How to file Form 1040 vs Form 1040-NR
Once you’ve determined your tax residency status, it’s time to file the correct form – either Form 1040 (for residents) or Form 1040-NR (for nonresidents).
Form 1040
Form 1040 is due April 15, 2026. US citizens and resident aliens living abroad get an automatic extension to June 15, 2026 (IRS.gov).
E-filing is the fastest option and supports direct deposit for refunds.
Common supporting documents for Form 1040 include the following four:
- W-2s, 1099s, or other income statements
- Form 1098-T (for education credits)
- bank interest or investment income records
- proof of health coverage (if applicable)
Form 1040-NR
The IRS has significantly expanded e-filing options for Form 1040-NR in recent years. Many nonresidents can now e-file through supported tax software in 2026, which speeds up processing and reduces errors (About Form 1040-NR, IRS.gov).
That said, some filers still need to print and mail their return, particularly dual-status filers and those attaching certain treaty statements.
Common supporting documents for Form 1040-NR include the following four:
- copy of your passport and visa
- W-2s, 1042-S, or 1099s
- treaty statement (if claiming benefits)
- Form 8833 (if required for treaty disclosure)
Form 1040-NR returns are due April 15, 2026, if you earned wages subject to US withholding, or June 15, 2026, if you did not. For mailing addresses, see IRS Publication 519.
Filed the wrong form? Here's how to fix it
The IRS determines form requirements based on your residency status, and using the wrong form can result in delays, incorrect tax treatment, or penalties.
If you filed Form 1040-NR instead of Form 1040, or the other way around, you'll need to submit Form 1040-X to amend your return. Amend as soon as you catch the mistake to limit interest and penalties.
In 2026, many amended returns can be filed electronically, which speeds up processing compared to the old paper-only process.
Need help? Talk to a tax professional
Filing the wrong form – or missing key deductions, credits, or treaty benefits – can lead to overpaying or delays from the IRS. If you’re unsure whether to file Form 1040, Form 1040-NR, or need to handle a dual-status situation, we’re here to help.
At Taxes for Expats, we specialize in working with expats, visa holders, and nonresident filers. We’ll review your situation, determine the correct filing status, and make sure your return is accurate and compliant.
FAQ
Generally, no. Form 1040-NR does not permit married filing jointly. The available statuses are single, married filing separately, or qualifying surviving spouse. In limited cases, such as when your spouse is a US citizen or resident alien, you may elect to file jointly on Form 1040 instead under IRC § 6013(g).
It depends on your citizenship status. US citizens and most green card holders living abroad file Form 1040 and report worldwide income, though exceptions apply if a treaty tiebreaker or formal abandonment changes their US tax status.
Form 1040-NR is strictly for nonresident aliens, meaning individuals who are not US citizens or green card holders and do not pass the substantial presence test.
It depends on your income sources. Resident aliens filing Form 1040 are taxed on worldwide income but can claim the standard deduction ($15,750 for Single filers in 2025) and a broad range of credits.
Nonresident aliens filing Form 1040-NR are taxed only on US-sourced income, but generally cannot claim the standard deduction and have limited access to credits. Filers with high foreign income often prefer nonresident alien treatment, while those with mostly US income benefit from resident filing.
No. A W-2 is a wage and tax statement from your employer showing how much you earned and how much tax was withheld. You use the W-2 figures to complete your tax return.
The W-2 is a supporting document. The Form 1040 or Form 1040-NR is the actual return you submit to the IRS.
Yes. If too much tax was withheld from your US income, you may be eligible for a refund. Refund options are more limited than for residents, since most credits do not apply to Form 1040-NR filers.
You'll need to file an amended return using Form 1040-X. Attach the correct form (1040 or 1040-NR) to the 1040-X and explain the reason for the change, for example, "Correcting residency status based on the substantial presence test."
In 2026, many amended returns can be filed electronically, which speeds up processing.
