How do I file US taxes if I have a Non-US Spouse?

Josh Katz, CPA
Author: Josh Katz, CPA
Updated: July 18, 2024

Filing American taxes can be a complex process, especially when you have a non-US spouse. The US tax system imposes unique challenges on citizens living abroad, but understanding your options can help you navigate these complexities. Here’s a guide on how to file US taxes if you have a non-US spouse.


1. Determine your Filing Status

Your filing status determines your tax rates and eligibility for certain credits and deductions. The key filing statuses to consider are:

  • Married Filing Jointly
  • Married Filing Separately

Married Filing Jointly

If you choose to file jointly, your non-US spouse will be treated as a US resident for tax purposes. This means your spouse’s worldwide income will be subject to US taxation. To elect this status, you and your spouse must sign a statement to be attached to your tax return, declaring your spouse’s intention to be treated as a resident for tax purposes. This election can be made by attaching a statement to your tax return that includes the following:

  • Full name and social security number (or Individual Taxpayer Identification Number) of your spouse.
  • Declaration signed by both you and your spouse stating your intention to be treated as residents for tax purposes.

Married Filing Separately

If you choose this status, only your income will be taxed by the US. This option might be more favorable if your spouse has substantial income that would be subject to US taxes. However, this filing status may limit certain tax benefits.


2. Obtain an ITIN for Your Non-US Spouse

If your non-US spouse doesn’t have a Social Security Number (SSN), you’ll need to obtain an Individual Taxpayer Identification Number (ITIN) for them. An ITIN is a tax processing number issued by the IRS for individuals who are not eligible to obtain an SSN. Here’s how you can obtain an ITIN:

  • Fill out Form W-7 (Application for IRS Individual Taxpayer Identification Number).
  • Provide original or certified copies of documents proving your spouse’s identity and foreign status (such as a passport).
  • Submit the form and documents to the IRS. You can mail them, apply in person at an IRS Taxpayer Assistance Center, or through an IRS-authorized Acceptance Agent.


3. Understand the Implications of Filing Jointly

When you file jointly, your non-US spouse’s worldwide income is subject to US taxes. However, you may benefit from:

  • Higher standard deduction: Married couples filing jointly benefit from a higher standard deduction than those filing separately.
  • Tax credits: You may qualify for tax credits, such as the Earned Income Tax Credit (EITC) or the Child Tax Credit, which might not be available if you file separately. To mitigate the impact of worldwide income taxation, you can use the Foreign Earned Income Exclusion (FEIE) and the Foreign Tax Credit (FTC) to avoid double taxation.


4. Report Foreign Financial Accounts

Both you and your non-US spouse must report any foreign financial accounts exceeding $10,000 at any point during the year by filing the FBAR (FinCEN Form 114). Additionally, you might need to file Form 8938 (Statement of Specified Foreign Financial Assets) if your foreign assets exceed certain thresholds.


5. Consider the Tax Treaty Benefits

The US has tax treaties with various countries that can affect how you report income and pay taxes. These treaties can help avoid double taxation and may provide other benefits. Consult the IRS website or a tax professional to understand the specific provisions of any tax treaty between the US and your spouse’s country of residence.

Filing US taxes with a non-US spouse involves several considerations, including determining your filing status, obtaining an ITIN, and understanding the implications of your choice. By following these steps and seeking professional advice when needed, you can successfully manage your tax obligations and take advantage of available benefits.