Overview
When applying for an Individual Taxpayer Identification Number (ITIN), the IRS requires you to check one box at the top of Form W-7 that explains why you need an ITIN. Selecting the wrong reason — or leaving it blank — will result in your application being rejected.
There are 8 reason codes, labeled a through h. Most applicants check only one. The exception is that option h can be checked alongside option a or f in certain situations.
This guide explains each reason, who it applies to, and what you need to provide.
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Reason a — Nonresident Alien Claiming a Tax Treaty Benefit
Who this applies to: Nonresident aliens who need an ITIN to claim benefits under a U.S. income tax treaty — such as a reduced withholding rate — even if they are not required to file a U.S. federal tax return.
What you must do: If you check box a, you must also check box h. On the dotted line next to box h, write the specific exception number (for example, Exception 1d – Pension Income), the treaty country name, and the relevant treaty article number.
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Reason b — Nonresident Alien Filing a U.S. Federal Tax Return
Who this applies to: Nonresident aliens who must file a U.S. federal tax return to report income connected (or not connected) to a U.S. trade or business, or who are filing solely to claim a refund.
Required document: A valid U.S. federal tax return must be attached to Form W-7. The IRS will not process your ITIN application without it.
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Reason c — U.S. Resident Alien Filing a U.S. Federal Tax Return
Who this applies to: Foreign nationals who qualify as U.S. resident aliens for tax purposes based on the Substantial Presence Test (meeting a specific threshold of days spent in the U.S.), are not eligible for a Social Security Number (SSN), and are required to file a U.S. tax return.
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Reason d — Dependent of a U.S. Citizen or Resident Alien
Who this applies to: Individuals who can be claimed as dependents on a U.S. federal tax return and are not eligible for an SSN.
What you must provide:
- Your relationship to the U.S. citizen or resident (e.g., child, parent)
- The full name and SSN or ITIN of the U.S. citizen or resident claiming you
Important: Under the Tax Cuts and Jobs Act (TCJA), the personal exemption was eliminated for tax years 2018 through 2025. Dependents should not apply for or renew an ITIN unless they qualify for a specific allowable tax benefit (such as the Child Tax Credit or Other Dependent Credit) or are filing their own tax return.
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Reason e — Spouse of a U.S. Citizen or Resident Alien
Who this applies to: Nonresident aliens who are married to a U.S. citizen or resident alien and need an ITIN, typically to file a joint U.S. tax return.
What you must provide: The full name and SSN or ITIN of the U.S. citizen or resident spouse.
Important: Same TCJA restriction applies. Spouses should only apply for an ITIN if they are filing a joint return or qualify for a specific allowable tax benefit.
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Reason f — Nonresident Alien Student, Professor, or Researcher
Who this applies to: Individuals in the U.S. on an F, J, M, or Q visa who are not eligible for an SSN and need to file a U.S. tax return or claim a tax treaty benefit.
What you must provide:
- Visa type and visa number
- Name of the school or institution
- U.S. entry date and expected duration of stay
If you are checking reason f to claim a tax treaty benefit, you must also check box h and note the specific exception and treaty information on the dotted line.
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Reason g — Dependent or Spouse of a Nonresident Alien with a U.S. Visa
Who this applies to: Family members accompanying a nonresident alien visa holder into the U.S. who are not eligible for an SSN.
What you must provide:
- A copy of the visa
- The U.S. entry date in line 6d of Form W-7
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Reason h — Other
Who this applies to: Applicants whose situation does not fit reasons a through g, or those applying based on a specific IRS exception — meaning they have a U.S. tax withholding or reporting obligation but are not required to file a U.S. tax return.
Common exceptions include:
- Exception 1(a) – Partnership Income
- Exception 1(d) – Pension Income
- Exception 3 – Mortgage Interest
What you must provide: Write the specific exception on the dotted line next to box h, and include the supporting documentation required for that exception (such as a bank letter, partnership agreement, or mortgage statement).
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Which Reason Code Applies to Most ITIN Applicants?
For the majority of our clients — including Chinese Shopify sellers, Amazon merchants, and international business owners — the applicable reason is typically h (Other), based on a specific IRS exception related to U.S.-sourced income such as payment platform revenue, rental income, or investment returns.
If you are unsure which reason applies to your situation, contact us and we will review your case before preparing your application.
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Compliance Summary
- Reason: a · Tax Return Required: No (if exception applies) · Notes: Must also check h
- Reason: b · Tax Return Required: Yes · Notes: Attach 1040-NR or 1040
- Reason: c · Tax Return Required: Yes · Notes: Attach 1040
- Reason: d · Tax Return Required: Yes (unless exception) · Notes: TCJA restriction applies
- Reason: e · Tax Return Required: Yes (unless exception) · Notes: TCJA restriction applies
- Reason: f · Tax Return Required: Yes (or exception) · Notes: May also check h for treaty
- Reason: g · Tax Return Required: No · Notes: Attach visa copy
- Reason: h · Tax Return Required: No (exception-based) · Notes: Write exception on dotted line
Selecting the correct reason is one of the most important steps in the ITIN application. An incorrect selection is a common reason the IRS rejects or delays applications.