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THE FINANCEBASE List yours

Guide

How to get an Individual Taxpayer Identification Number (ITIN) and file taxes

By TheFinanceBase Team 11 min read

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An Individual Taxpayer Identification Number (ITIN) is a nine-digit number the IRS issues for federal tax purposes to people who need a U.S. taxpayer identification number but cannot get a Social Security number (SSN). To apply, you normally complete Form W-7, attach it to the federal income-tax return for which you need the number, and provide the identity and foreign-status documents required by the current IRS instructions. You can mail the package or use an IRS-authorized verification route. The IRS generally says to allow seven weeks for a status notice, or nine to 11 weeks during its stated peak period or for applications from overseas.

What an ITIN is—and who should apply

An ITIN is used only for federal tax administration. It is not an SSN. Getting one does not, by itself, provide work authorization, establish eligibility for federal benefits, or change immigration status; the IRS describes the number as a way to meet federal tax-filing and reporting requirements.

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You generally need an ITIN when all three conditions apply:

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  • You have a federal tax reason to obtain a U.S. taxpayer identification number.
  • You are an individual who is not eligible for an SSN.
  • You can document your identity and foreign status under the current Form W-7 rules.

If you may qualify for an SSN, resolve that question with the Social Security Administration before applying for an ITIN. Do not request an ITIN simply because an SSN application is inconvenient; the IRS process is intended for people who are ineligible for an SSN.

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Read the IRS explanations of the form and eligibility before assembling your package: About Form W-7 and the current Instructions for Form W-7.

What to prepare before completing Form W-7

Identify the return or exception that supports the application

For a standard application, Form W-7 is submitted with the U.S. federal income-tax return on which the ITIN will be used. The return is generally Form 1040 or Form 1040-NR, depending on the filer’s circumstances. The current instructions also describe exceptions to the tax-return requirement. If an exception applies, you submit the evidence specified for that exception instead of attaching a return.

Do not assume that a return is optional because you have no tax due. The W-7 instructions state that an individual applying for an ITIN must include a U.S. federal tax return unless an exception applies, along with the required documentation. Use the exception descriptions in the current instructions to determine whether your situation qualifies and exactly what proof is required.

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Gather identity and foreign-status evidence

The IRS requires documentation that establishes both identity and foreign status. The acceptable-document rules differ by document and by applicant. In general, the instructions require original documents or certified copies from the issuing agency, rather than an ordinary photocopy. Check the current list before sending anything because a document that proves identity may not, by itself, prove foreign status.

Make a document plan for every applicant. Note which original or certified copy will be used, whether it contains the information the IRS requires, and how it will be submitted. Keep a complete copy or scan for your records, but do not substitute that copy for the original or certified copy when the instructions require the latter.

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Prepare a separate package entry for each applicant

Every person requesting an ITIN completes and signs a separate Form W-7. If a spouse or dependent is applying with the primary filer, attach each applicant’s W-7 to the same federal return. Leave the SSN field blank for each person who is applying for an ITIN; do not invent a number or enter a pending SSN.

How to complete and assemble the application

  1. Complete the current Form W-7. Use the latest form and follow the line-by-line instructions. Enter the applicant’s legal name, mailing information, birth details, country information, and the reason for applying exactly as the supporting records and tax return show them.
  2. Sign the form. An unsigned W-7 is incomplete. If another person signs under a permitted authority, follow the signature and documentation rules in the instructions.
  3. Prepare the federal return or exception evidence. Attach the return for which the number is needed unless a documented exception applies. For an exception, include every item the instructions specify for that category.
  4. Attach the W-7 to the front of the return. Keep the W-7 with the return rather than mailing it separately. For a joint return with several applicants, attach a separate signed W-7 for each applicant.
  5. Leave the SSN space blank for ITIN applicants. The IRS will assign the ITIN and write it on the submitted return when the application is approved.
  6. Review names, dates and document consistency. Differences between the W-7, return and identity documents can lead to a request for more information or rejection. Correct an error before mailing instead of relying on a later explanation.
  7. Make a record of what you send. Retain copies of the completed W-7 forms, return, exception evidence, document list and mailing proof. Do not send the only copy of a record you need for another legal or tax purpose.

Choose a submission route

The three routes below use the same underlying W-7 requirements but differ in how documents are authenticated and returned. Confirm the current service details before making an appointment or mailing originals.

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Route How it works Document-handling issue Best fit
Mail Send the completed W-7 package, federal return or exception evidence, and required identity/foreign-status documents to the ITIN Operation address printed in the current W-7 instructions. The IRS receives the documents with the package. Use the ITIN address in the instructions, not the ordinary address used for a tax return mailed without a W-7. Applicants who cannot reach an in-person verifier and can safely send the required originals or certified copies.
IRS Taxpayer Assistance Center A designated TAC may verify certain original documents or certified copies in person. Service is appointment-only, and not every TAC offers ITIN document authentication. Confirm that the selected location provides this service and ask what to bring. Applicants who want an IRS employee to inspect qualifying documents before the package is submitted.
Acceptance Agent (AA) An IRS-authorized AA can help complete and submit Form W-7. An AA must submit originals or certified copies to the IRS for all applicants. Ask how the documents will be transmitted and returned. Applicants who want help preparing the form but understand that the originals still go to the IRS.
Certifying Acceptance Agent (CAA) A CAA can authenticate certain original documents and submit the certification with the application. The authority is limited by applicant and document type. A CAA can return documents after review only when the particular document and applicant fall within the permitted scope. Applicants who need document authentication and want to avoid mailing qualifying originals to the IRS.

Use the IRS instructions and How to apply for an ITIN to verify the route, current appointment process and document rules. An agent’s ability to handle one applicant’s documents does not automatically mean the agent can authenticate every family member’s documents.

Where to mail Form W-7

Mail the complete package to the ITIN Operation address printed in the current Form W-7 instructions. That address is distinct from the ordinary mailing address for a federal tax return. Because IRS addresses and form revisions can change, copy the address from the current instructions immediately before mailing rather than relying on an old envelope or an address found in an older guide.

Place the W-7 package together so the IRS can match the form, return and evidence. Use a mailing method that gives you proof of delivery and keep the tracking record with your copies. A tracking receipt does not prove that the application is complete, but it establishes when the package reached the IRS.

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If several members of a household apply on one return, include all of their separate W-7 forms and supporting evidence in that same package. If you are submitting returns for more than one tax year, the instructions allow multiple-year returns to be attached to the W-7 package when the application covers those years.

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What happens to your tax return while the ITIN is pending?

The federal return submitted with Form W-7 is part of the ITIN application. The IRS assigns the number, writes it on the submitted return when approved, and then forwards the return for processing. Do not mail a second copy of the same return merely because the ITIN has not yet arrived unless the IRS specifically instructs you to do so.

A newly assigned ITIN has an important electronic-filing limitation. The December 2024 W-7 instructions state: “You can’t electronically file (e-file) a return using an ITIN in the calendar year the ITIN is assigned.” Therefore, a return using an ITIN assigned during that calendar year cannot be e-filed with that number in that same year. Follow the IRS instructions for the applicable filing year and retain the paper-filing records associated with the W-7 package.

Submitting a W-7 does not guarantee that the return will be accepted as filed, that a refund will be issued, or that an exception will be approved. The IRS may request additional evidence. Keep responding documents tied to the notice and the applicant whose information was questioned.

How long an ITIN application takes

The IRS’s general estimate is seven weeks for notification of application status. The estimate is nine to 11 weeks when the application is submitted during the IRS peak period of January 15 through April 30 or when it is submitted from overseas. These are guidance estimates, not guaranteed completion dates; missing information, document questions and seasonal volume can extend the process.

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Situation IRS guidance How to interpret it
Most applications Allow 7 weeks for a status notification. This is an estimate for receiving a notice, not a promise that an ITIN will be assigned in exactly seven weeks.
Application during January 15–April 30 Allow 9–11 weeks. The period is identified by the IRS as its peak season.
Application from overseas Allow 9–11 weeks. The estimate applies to overseas submissions under the IRS guidance.
Processing queue snapshot The IRS processing-status page reported applications received in September 2026 in an October 2026 snapshot. This is a changing queue observation, not a personal turnaround estimate. Check the live page for the latest status.

For the latest queue information, consult Processing status for tax forms. The page can move forward or backward as the IRS receives new work, so do not treat the month shown there as a guaranteed completion date for your package.

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Read and respond to IRS notices

The IRS uses several notice codes for ITIN applications:

Notice Meaning What to do
CP565 An ITIN was assigned. Keep the notice with your tax records and use the number exactly as shown when a federal return requires it.
CP566 The IRS needs more information. Read the notice carefully, provide the requested evidence by the stated method and deadline, and identify the applicant and application involved.
CP567 The application was rejected. Review the reason, correct the underlying problem if possible and follow the response or reapplication instructions in the notice and current W-7 guidance.

The IRS says mailed supporting documents should be returned to the Form W-7 address within 60 days. If the expected status period has passed without a notice, or your originals have not been returned within that period, use the current contact instructions on the IRS ITIN page rather than sending an unrequested duplicate package.

Renew an expired ITIN before filing

An ITIN does not require renewal every year. Renewal is generally needed when the number is expired and will be used on a federal return. The W-7 instructions state that an ITIN not included on a federal return for three consecutive tax years expires at the end of the third such year. An ITIN assigned before 2013 that was never renewed is also expired.

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To renew, generally submit Form W-7 with the federal return on which the number will be used, unless an exception applies. The renewal process still requires the documentation specified by the current instructions. If a spouse or dependent also has an expired ITIN that will be used, that person needs a separate W-7.

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Filing with an expired ITIN can delay return processing. Check the number’s status before preparing a return, especially if it has not appeared on a federal return for several years. IRS Topic no. 857 and the W-7 instructions explain the current renewal rules.

Common problems and how to prevent them

Sending a photocopy when an original or certified copy is required

An ordinary photocopy may not satisfy the documentation rule. Confirm whether the specific document must be an original or a certified copy from the issuing agency. If mailing originals is a concern, investigate a designated TAC or a CAA that can authenticate the document type for that applicant.

Using the wrong mailing address

A W-7 package goes to the ITIN Operation address printed in the current instructions, not automatically to the address used for an ordinary tax return. Recheck the address and form revision immediately before mailing.

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Leaving an SSN on the form or entering a made-up number

Leave the SSN area blank for each person applying for an ITIN. If an applicant has an SSN or becomes eligible for one, the correct course may be different; resolve that eligibility question rather than maintaining two identification-number applications.

Submitting one W-7 for a whole family

Each applicant needs an individual, signed W-7. Family members can be included on the same federal return, but their forms and evidence remain separate.

Assuming an agent can return every document

An AA and a CAA do not have identical authority. An AA must submit originals or certified copies for all applicants. A CAA can authenticate and return only documents within the authority allowed for the particular applicant and document type. Ask before handing over records.

Ignoring a notice

A CP566 request or CP567 rejection requires action. Match the response to the notice, preserve proof of delivery and avoid sending unrelated documents that do not address the stated deficiency.

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Planning to e-file immediately after assignment

The IRS expressly bars e-filing a return using an ITIN in the calendar year that number is assigned. Build the filing plan around that rule and the instructions for the relevant tax year.

Applicant checklist

  • Confirmed that the applicant needs an ITIN for a federal tax purpose and is not eligible for an SSN.
  • Selected the federal return or documented W-7 exception that supports the application.
  • Completed and signed one current Form W-7 for every applicant.
  • Prepared identity and foreign-status evidence in the original or certified-copy format required for each document.
  • Left the SSN field blank for each ITIN applicant.
  • Attached each W-7 to the front of the same return, or assembled the specified exception evidence.
  • Selected mail, a qualifying TAC, an AA or a CAA after confirming document-handling rules.
  • Used the current ITIN Operation mailing address if mailing.
  • Copied the full package and recorded tracking or appointment details.
  • Marked the date sent and the date on which the seven-week or nine-to-11-week estimate should be checked.
  • Saved every IRS notice and responded to CP566 or CP567 as directed.
  • Checked whether an existing ITIN has expired before using it on a return.

Official IRS resources

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