How Do I Apply for an ITIN?

To apply for an ITIN, you submit Form W-7 to the IRS along with documents that prove your identity and foreign status. In most cases, you must also include a U.S. tax return, although some applicants qualify to apply without one under an IRS-approved exception.

The process sounds simple. The challenge is making sure every part of the application supports the reason you need the ITIN. A wrong selection on Form W-7, an incorrect tax return, unacceptable identity documents, or missing supporting paperwork can cause the entire application to be rejected.

A Real Example

Maria inherited funds from a relative's U.S. retirement account after the relative passed away. The retirement account custodian told her she needed an ITIN before it could release the funds.

Maria had no U.S. income, wasn't required to file a U.S. tax return, and didn't own a business or property in the United States. She assumed that meant she couldn't get an ITIN at all.

In reality, her situation qualified under an IRS-approved exception that didn't require a tax return, but it did require a specific letter from the custodian that met exact IRS wording requirements. Her first attempt, drafted informally, was rejected.

Through ITIN Abroad, we identified the correct exception, worked with the custodian to get a compliant letter, and resubmitted a complete package.

Maria's case shows why the reason you're applying for matters more than the form itself. It determines which documents you need, whether a tax return is required, and how your application must be prepared.

Step 1: Confirm Why You Need an ITIN

Before completing any forms, determine why you need the ITIN now.

The IRS requires a specific and current tax reason. You may need an ITIN if you will receive U.S.-source income, have had U.S. tax withheld, or need to reduce the amount of U.S. tax owed during the current year.

Other applicants may need an ITIN because they:

• Are the foreign spouse or dependent of a U.S. taxpayer

• Own U.S. rental property

• Sold U.S. real estate

• Are starting or operating a U.S. business (see "I'm Starting a U.S. Business. Now What?" for a closer look at this path)

• Need to receive an inheritance, retirement distribution, or other U.S. funds

• Need one to meet a qualifying mortgage, educational, financial, or other IRS-approved requirement

  
  

Simply wanting an ITIN is not enough. The reason you are applying determines what comes next.

Step 2: Determine Whether You Need a U.S. Tax Return

Most first-time ITIN applications are submitted with a U.S. federal tax return.

The return and Form W-7 are generally submitted together as one application package. The IRS processes the ITIN application first, then sends the tax return for normal processing once the ITIN has been assigned.

Some applicants — like Maria — can apply without filing a tax return if they meet the requirements for an IRS-approved exception. These cases often require different supporting documentation instead, such as a letter from a financial institution, company, educational institution, or mortgage lender.

This is where applications can become frustrating. The IRS may require very specific information in those documents, and a letter that seems perfectly reasonable may still be rejected if it doesn't meet the IRS's exact requirements.

Step 3: Gather Your Identity Documents

The IRS requires documents that establish both your identity and your foreign status. A passport is commonly used because it can establish both.

Depending on your situation, other documents may also be accepted, but the IRS has strict rules about how identity documents must be provided and verified. This is not the same as simply making a photocopy of your passport.

If you work with a Certified Acceptance Agent (CAA), the CAA must follow specific IRS procedures for identity verification before certifying the required documents for your application.

Applicants outside the United States may face additional challenges obtaining acceptable documentation. Apostilles and ordinary foreign notarizations do not replace the IRS's document requirements. Depending on the circumstances, acceptable options may include documents certified by the issuing agency or assistance from a U.S. Embassy or Consulate.

ITIN Abroad will guide you through the appropriate process for your situation.

A Note for Military Families

U.S. military members stationed overseas may face additional challenges when applying for ITINs for foreign spouses or children.

The family may be dealing with deployments, relocations, limited access to qualified tax help, and foreign identity documents all at once — while trying to file a correct U.S. tax return.

If a spouse or child needs an ITIN before they can be correctly included on the return, delays or rejection can affect filing status, available tax benefits, and the family's refund.

The identity and application requirements are the same for military families as for anyone else, but planning ahead can make the process much easier.

(A dedicated guide for military families is coming soon.)

Step 4: Prepare Form W-7

Form W-7 is the actual ITIN application.

This is where you provide information such as:

• Your name

• Foreign address

• Country of citizenship

• Birth information

• Identity-document information

• The reason you are applying

  
  

The reason selected on Form W-7 must agree with the tax return and all supporting documents.

This matters because Form W-7 is not reviewed in isolation. A perfectly prepared W-7 can still be rejected if the attached tax return is incorrect or the supporting documents aren't acceptable.

Step 5: Prepare the Supporting Tax or Exception Documents

Your application package must support the reason listed on Form W-7.

If you're applying with a tax return, that return must be prepared correctly under U.S. tax law.

If you're applying without a tax return, the required exception documentation must meet the IRS requirements for your specific situation. As Maria's case shows, even a reasonable-sounding letter can fall short if it is missing information the IRS requires.

Foreign applicants sometimes assume they can prepare their U.S. return the same way they'd prepare one in their home country. The U.S. tax system may require much more detailed reporting and documentation.

An error on the tax return can become an ITIN problem too.

Step 6: Submit the Complete Application Package

Once everything is prepared, the entire package is submitted together.

Depending on your situation, it may include:

• Form W-7

• A U.S. tax return

• Identity documents

• Supporting financial or business records

• Withholding documents

• Mortgage documentation

• Third-party letters

• Documentation supporting an IRS-approved exception

  
  

The goal is for the IRS employee reviewing the package to see a clear and consistent reason for issuing the ITIN.

Step 7: Wait for the IRS to Process the Application

After submission, the IRS reviews the application and supporting documents. If approved, the IRS issues the ITIN and sends a confirmation notice.

Processing times vary, especially for applications submitted from outside the United States or during busy filing periods.

If the application is rejected, the rejection notice may not identify the specific preparation error. That can leave applicants unsure what to correct before trying again.

This is one reason keeping a complete copy of everything submitted is so important.

Can I Apply for an ITIN Myself?

Yes. Some people have straightforward situations and successfully prepare their own applications.

But the process can become more difficult when:

• A tax return is required

• U.S. tax has been withheld

• A tax treaty is involved

• You are selling U.S. real estate

• You are applying under an exception

• A third-party letter is required

• You have unusual identity-document circumstances

• You have previously been rejected

  
  

The important question isn't simply whether you can prepare Form W-7 yourself. It's whether you're confident the entire application package is accurate.

How ITIN Abroad Can Help

ITIN Abroad is led by an Enrolled Agent who is also a Certified Acceptance Agent, combining U.S. tax expertise with specialized knowledge of the ITIN application process.

We help confirm your reason for applying, prepare Form W-7 and any related tax return included in your engagement, review supporting documents, guide you through identity verification, maintain copies of your application, and follow up with the IRS during normal processing. (See "Is Using a Certified Acceptance Agent Worth It?" for more on exactly what that involves.)

FAQ

Do I always need to file a tax return with an ITIN application?

No. Most applicants apply with a U.S. tax return, but some qualify for an IRS-approved exception that allows them to apply without one.

Can I mail a copy of my passport?

Not an ordinary photocopy. The IRS has specific rules for acceptable identity documents and how they must be verified or certified.

Can I apply for an ITIN before I need it?

Usually not. The IRS requires a current tax reason or qualifying exception. An ITIN is not issued simply because you may need one in the future.

What if my ITIN application was already rejected?

You need to determine what caused the rejection before submitting the same application again. Refiling without correcting the underlying issue may result in another rejection.

Does a CAA only verify my passport?

No. A Certified Acceptance Agent follows IRS procedures for the ITIN process, including identity verification. An experienced CAA may also help coordinate the application, tax return, supporting documents, and IRS follow-up.

Applying for an ITIN is not just about completing Form W-7. The goal is to submit one complete, accurate application package that clearly shows the IRS why you qualify — so the IRS receives the correct information the first time.