Gokce Tandogdu
ITIN Specialist, itin.net
A spouse with an ITIN is generally taxed on their U.S. source income in the same manner as any other individual taxpayer. The amount of tax owed depends on their filing status, the type and amount of income earned, and any applicable tax treaties. An ITIN itself does not change tax liability; it is simply an identification number for tax purposes for those who do not have and are not eligible for a Social Security Number (SSN).
Determining Tax Liability for a Spouse with an ITIN
The core principle is that an ITIN is for tax processing. It allows individuals who are required to file a U.S. tax return or who are claimed as a dependent but cannot get an SSN to comply with U.S. tax law. The question of how much tax for a spouse with an ITIN hinges on their U.S. tax obligations. These obligations are determined by their residency status for tax purposes and the source of their income.
U.S. Tax Residency Status
For tax purposes, an individual's residency is determined by the Substantial Presence Test or the Green Card Test. Most non-resident aliens are not U.S. residents for tax purposes. However, if a spouse with an ITIN meets either of these tests, they are considered a U.S. resident alien for tax purposes and are taxed on their worldwide income, similar to U.S. citizens.
- Non-Resident Alien: If the spouse is a non-resident alien, they are only taxed on their U.S. source income. This typically includes income from services performed in the U.S., income from U.S. businesses, and certain other U.S. source passive income. Tax rates for non-resident aliens can vary. Income effectively connected with a U.S. trade or business is taxed at graduated rates, while certain passive income (like interest and dividends not effectively connected) may be subject to a flat 30% withholding tax, unless reduced by a tax treaty.
- Resident Alien: If the spouse is a resident alien for tax purposes, they are taxed on all income, regardless of where it is earned. This is often referred to as being taxed on their worldwide income. The tax rates applied are the same graduated rates that apply to U.S. citizens.
Filing Status
An individual's filing status significantly impacts their tax liability. For a spouse with an ITIN who is married, the available filing statuses are typically:
- Married Filing Separately (MFS): Each spouse files their own individual tax return. This is often the default for non-resident aliens who are not married to a U.S. citizen or resident alien.
- Married Filing Jointly (MFJ): If both spouses are U.S. citizens or resident aliens, they can elect to file a joint return. This is generally more beneficial as it allows for the aggregation of income, deductions, and credits, often resulting in a lower tax liability. A spouse who is a non-resident alien generally cannot file MFJ unless they elect to be treated as a resident alien for tax purposes. This election, made by filing Form 8833, requires the individual to report their worldwide income on the joint return and can have significant implications.
For non-resident aliens, the most common filing status is Married Filing Separately. If the spouse with the ITIN is the only one with U.S. source income, they would file Form 1040-NR, U.S. Nonresident Alien Income Tax Return, reporting that income.
What Income is Taxable?
The type and source of income are critical in determining tax obligations for a spouse with an ITIN.
- U.S. Source Income for Non-Residents: This can include wages earned from working in the U.S., income from a U.S. business, rental income from U.S. property, and royalties from U.S. sources. Income from services performed in the U.S. is generally considered U.S. source income.
- Effectively Connected Income (ECI): This is income generated from the active conduct of a trade or business within the U.S. ECI is taxed at the same graduated rates as U.S. citizens and residents, after applicable deductions.
- Fixed, Determinable, Annual, or Periodical (FDAP) Income: This is generally passive income such as interest, dividends, royalties, rents, and annuities from U.S. sources. FDAP income not effectively connected with a U.S. trade or business is typically subject to a flat 30% withholding rate, unless a tax treaty provides for a reduced rate.
- Worldwide Income for Resident Aliens: As mentioned, if the spouse with the ITIN is considered a U.S. resident alien for tax purposes, all their income from any source worldwide is subject to U.S. taxation.
Tax Treaties and Withholding Rates
The U.S. has tax treaties with many countries. These treaties can reduce or eliminate U.S. tax on certain types of income for residents of those countries. For example, a tax treaty might reduce the 30% withholding rate on dividends or royalties to 15%, 10%, or even 0%.
To claim a reduced treaty rate, the individual typically needs to provide a Form W-8BEN, Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting (Individuals), to the U.S. payer of the income. This form certifies their foreign status and their eligibility for treaty benefits. The ITIN is used on tax forms when reporting this income, even if it is exempt or taxed at a reduced rate due to a treaty.
It is important to consult the specific tax treaty between the U.S. and the individual's country of residence to understand the applicable reduced rates and conditions. These details can be complex and vary significantly by country and income type.
The Role of the ITIN
The ITIN (Individual Taxpayer Identification Number) is issued by the Internal Revenue Service (IRS) to individuals who need a U.S. taxpayer identification number but do not have and are not eligible to obtain a Social Security Number (SSN). This includes non-resident aliens who have U.S. tax filing obligations or are dependents on a U.S. tax return.
- Application for an ITIN: To obtain an ITIN, an individual must file Form W-7, Application for IRS Individual Taxpayer Identification Number. This form requires proof of identity and foreign status, typically through original or certified copies of documents like passports or national identity cards. The application can be submitted directly to the IRS or through an IRS-authorized Certified Acceptance Agent (CAA). Using a CAA, such as itin.net, can streamline the process by verifying original documents on your behalf, avoiding the need to mail them to the IRS.
- Using the ITIN on Tax Returns: The ITIN is used in place of an SSN on all U.S. federal tax returns (e.g., Form 1040-NR) and other tax-related documents. It is essential for accurate tax processing and reporting.
- ITIN vs. SSN: An ITIN does not authorize employment in the U.S. or provide eligibility for Social Security benefits. It is solely for tax administration purposes.
Filing Requirements for Spouses with ITINs
Whether a spouse with an ITIN owes taxes depends on whether they have U.S. tax filing requirements. These requirements are generally triggered by earning U.S. source income.
- When Filing is Required: A non-resident alien spouse with an ITIN must file Form 1040-NR if they:
- Were engaged in a trade or business in the U.S. during the tax year.
- Had U.S. income on which the tax liability was not fully satisfied by withholding at the source.
- Are claiming a refund of over-withheld tax.
- Are claiming treaty benefits.
- When Filing is Not Required: If a non-resident alien spouse has U.S. source income, but the tax on that income was fully withheld by their U.S. payer (e.g., a flat 30% withholding on passive income not eligible for treaty benefits), and they do not wish to claim a refund or treaty benefits, they may not need to file a return. However, claiming treaty benefits or seeking a refund of excess withholding always requires filing a return.
Business Operations and Related Filings
If the spouse with an ITIN is involved in a U.S. business, such as a U.S. LLC, this can create additional tax considerations and filing requirements.
- U.S. LLCs: If the spouse is a member of a U.S. LLC, they may have reporting obligations even if the LLC does not generate income. For instance, a foreign-owned single-member LLC or a foreign-owned partnership may need to file Form 5472, Information Return of a 25% Foreign-Owned U.S. Corporation or a Foreign Corporation Engaged in a U.S. Trade or Business, along with a pro-forma Form 1120. These forms are due even if no tax is owed. Failure to file can result in significant penalties. The ITIN would be used on these forms if the individual is reporting income or is the responsible party.
- EIN (Employer Identification Number): If the U.S. business requires an EIN, such as for opening a U.S. bank account or hiring employees, an application must be made. An ITIN can sometimes be used as a substitute for an SSN when applying for an EIN, particularly if the applicant is the sole owner and not a U.S. citizen or resident. The application for an EIN is made using Form SS-4.
- Banking: Opening a U.S. bank account is often a necessary step for U.S. business operations. While some banks may require an SSN, many will accept an ITIN, especially if the individual is establishing a U.S. business entity like a U.S. LLC. Services like Mercury, Relay, or Brex are popular among non-residents for business banking.
How to Get Help
Navigating U.S. tax laws as a non-resident can be complex. Understanding your specific tax obligations, especially when dealing with U.S. source income or business interests, requires careful attention to detail.
- Certified Acceptance Agents (CAAs): For obtaining an ITIN, CAAs are IRS-authorized individuals or entities that can assist with the Form W-7 application. They can authenticate your original identification documents, reducing the risk of loss or delay associated with mailing them to the IRS. itin.net is an authorized CAA service.
- Tax Professionals: For advice on tax liability, treaty benefits, and filing requirements, consulting with a qualified U.S. tax professional experienced in international taxation is highly recommended. They can help determine residency status, identify all U.S. source income, and ensure compliance with U.S. tax laws, including forms like Form 1040-NR and Form 5472.
- IRS Resources: The IRS provides extensive information on its website (irs.gov), including publications and forms relevant to non-resident aliens. However, these resources are general and may not cover every specific situation.
Ultimately, the question of how much tax for a spouse with an ITIN is not about the ITIN itself, but about the individual's U.S. tax residency, the source and nature of their income, and their chosen filing status. The ITIN is merely the tool used to identify them for tax administration purposes when they have U.S. tax obligations but no SSN.