ITIN for Non-US Spouse: How to File Jointly

Why Your Spouse Needs an ITIN

The IRS requires a valid taxpayer identification number for every person listed on a federal tax return. If your spouse is not a US citizen or permanent resident and does not have work authorization, they are not eligible for a Social Security Number. But you still need a way to include them on your tax return if you want to file jointly.

That is where the ITIN comes in. An Individual Taxpayer Identification Number is a nine-digit number issued by the IRS specifically for people who have a US tax obligation but cannot get an SSN. For married couples, the most common reason for needing a spouse ITIN is to file a joint federal tax return that includes both spouses.

Without a spouse ITIN, you are limited to filing as Married Filing Separately, which almost always results in a higher combined tax bill. The cost difference between filing separately and filing jointly can be thousands of dollars every single year, making the spouse ITIN one of the most financially impactful tax decisions a married couple can make.

Your spouse may also need an ITIN for other purposes: opening a US bank account, building credit history, or applying for a driver's license in states that require a tax ID. But the joint filing benefit is by far the biggest reason to apply. For a complete overview of all ITIN use cases, see our guide on what is an ITIN.

Joint Filing Election Explained

When you are married to a non-US spouse, you have a special option under the Internal Revenue Code. Section 6013(g) allows you to make a joint filing election that treats your nonresident alien spouse as a resident for tax purposes. This election is what makes joint filing possible even when your spouse has no US income and no immigration status that would otherwise qualify them.

How the election works. You and your spouse both sign a statement attached to your joint tax return declaring that you are electing to treat the nonresident spouse as a US resident for federal income tax purposes. Once made, this election applies to all future tax years unless you revoke it. The election does not affect your spouse's immigration status in any way.

Who this applies to. The joint filing election is relevant when one spouse is a US citizen or resident alien and the other is a nonresident alien. This covers many common situations: a US citizen married to someone living abroad, a green card holder married to someone on a non-work visa, or any mixed-status couple where one spouse lacks an SSN.

What it means for the ITIN. Your spouse needs an ITIN before (or at the same time as) you file the joint return that makes this election. The W-7 application and the joint return are submitted together in one package. The IRS processes the ITIN first, then processes your joint return with both taxpayer identification numbers in place.

If your spouse holds an H-4 visa specifically, our detailed guide on ITIN for H-4 visa holders covers the visa-specific details and requirements.

Tax Benefits of Joint Filing

Filing jointly with your spouse provides significant tax advantages compared to filing separately. The savings are not marginal. For most couples, the difference is thousands of dollars per year. Here is a direct comparison of the two filing statuses:

The math is straightforward. A spouse ITIN costs $197 (Standard) or $297 (Express) through our service. The tax savings from filing jointly are $2,000 to $8,000 every year. The ITIN pays for itself in the first filing season and continues saving you money for every year after that. There is no scenario where the cost of the ITIN outweighs the joint filing benefits for couples with even moderate income.

How to Apply for a Spouse ITIN

The spouse ITIN application follows a specific sequence. Each step builds on the previous one, so completing them in order avoids delays and rejected applications.

Documents Required for a Spouse ITIN

The IRS needs to verify your spouse's identity and foreign status. A valid passport is the simplest way to meet both requirements with a single document. Here is the full list of what you need:

Required for every application:

• Completed Form W-7 signed by your spouse
• Federal tax return (Form 1040) filed as Married Filing Jointly
• Valid, unexpired passport (proves both identity and foreign status)

If your spouse does not have a valid passport:

• National identification card showing name, photograph, address, date of birth, and expiration date
• Civil birth certificate (required if no passport is available)
• US visa issued by the Department of State
• Foreign driver's license
• Foreign military identification card

Without a passport, your spouse needs at least two documents from the IRS accepted list: one to prove identity and one to prove foreign status. The passport is strongly recommended because it satisfies both requirements and simplifies the process significantly.

All documents must be originals or certified copies from the issuing agency. Notarized copies are not accepted by the IRS. When you work with itin.so as your CAA, we certify the documents so you never need to mail originals.

Spouse ITIN Processing Timeline

Understanding the timeline helps you plan around tax deadlines. The process has two phases, and the total time depends on which service level you choose.

Preparation phase (with itin.so). Standard service takes 7 to 10 business days. During this time, we review your spouse's documents, complete the W-7, prepare the joint return attachment, and certify all identity documents. Express service compresses this to 2 to 3 business days for couples facing tight deadlines.

IRS processing phase. Once the IRS receives your complete package, processing takes 7 to 11 weeks. The IRS assigns the ITIN and mails a CP565 notice to the address on the W-7. Your joint tax return is held during this period and processed after the ITIN is assigned.

Total timeline. Standard service: 9 to 13 weeks from start to ITIN in hand. Express service: 8 to 12 weeks. If you file during peak tax season (January through April), IRS processing may trend toward the longer end of the 7 to 11 week range due to higher volume.

Planning tip. If you need the spouse ITIN to file your taxes by the April deadline, start the process by December or early January. You can also file for an extension using Form 4868, which gives you until October to file the return while the ITIN is being processed. The extension does not affect any tax payments owed, but it prevents late filing penalties.

To check on your application once it has been submitted, see our guide on how to check ITIN status.

Family Applications: $79 for Each Additional ITIN

Many couples applying for a spouse ITIN also need ITINs for their children or other dependents. At itin.so, your first application is $197 (Standard) or $297 (Express). Every additional family member in the same submission is just $79, regardless of whether they are a child, parent, or other qualifying dependent.

Here is what family pricing looks like in practice:

All family W-7 forms are submitted together with a single tax return, and the IRS processes the entire package as one unit. This means everyone receives their ITIN within the same 7 to 11 week processing window. You do not wait separately for each family member.

Each application includes W-7 preparation, document review and certification, IRS submission, application tracking, and WhatsApp support. Every application comes with a 100% money-back guarantee. If the IRS declines any application in your family package, you receive a full refund for that specific application.

For more details on dependent applications specifically, see our complete guide on ITIN for dependent spouses.

Common Spouse ITIN Questions

After helping hundreds of couples through the spouse ITIN process, these are the questions that come up most often. Understanding these points before you start will make the process smoother.

My spouse lives abroad. Can we still file jointly? Yes. The joint filing election under IRC Section 6013(g) allows you to include a nonresident spouse on your joint return regardless of where they live. Your spouse does not need to be in the United States, and they do not need to have earned any US income. The ITIN application can be completed entirely by mail through a CAA.

We got married mid-year. Do we file jointly for the full year? Yes. If you are married on December 31 of the tax year, the IRS considers you married for the entire year. You can file jointly for the full tax year even if you married on December 30. The joint return includes all of both spouses' income for the entire calendar year.

Can I amend previous returns to file jointly? Yes. If you filed separately in prior years because your spouse did not have an ITIN, you can file Form 1040-X (Amended US Individual Income Tax Return) to change those years to joint filing. You can amend returns for up to three years back. The tax savings from switching prior years to joint filing can be substantial.

What if my spouse's ITIN was assigned but we later divorce? The ITIN remains valid and assigned to your spouse regardless of marital status changes. After a divorce, each person files their own return. Your former spouse would use their ITIN on their own return if they have a US filing obligation, or the ITIN simply goes unused until it eventually expires from inactivity.

If your spouse already has an ITIN that has expired, our ITIN renewal guide explains exactly how to reactivate it before filing season.

Spouse ITIN Application at a Glance

Here is what to remember when applying for your spouse's ITIN:

• Your spouse needs an ITIN if they are not eligible for an SSN and you want to file jointly
• Filing jointly saves most couples $2,000 to $8,000 per year compared to filing separately
• The joint filing election under IRC 6013(g) treats your nonresident spouse as a resident for tax purposes
• A valid passport is the simplest identity document for the application
• The IRS processes spouse ITIN applications in 7 to 11 weeks
• Additional family members are just $79 each when applied together
• You can amend up to three prior years of returns to claim joint filing savings retroactively