ITIN Application from Pakistan: 2026 Step-by-Step Guide for Form W-7

An Individual Taxpayer Identification Number, or ITIN, is a nine-digit tax processing number issued by the Internal Revenue Service to people who have a US tax obligation but are not eligible for a Social Security Number. For Pakistani applicants, the most common reasons to obtain an ITIN are renting out US property, owning shares in a US LLC or corporation, claiming a US tax treaty benefit, receiving royalties or dividends from US sources, or filing a joint return with a US-citizen spouse. Without an ITIN, the IRS cannot process tax filings and many US payers are required to withhold tax at the highest statutory rate.

This guide covers the application process from Pakistan in 2026, with attention to the parts that trip Pakistani applicants up most often: the choice between mailing original documents and using a Certified Acceptance Agent, the question of whether a tax return must be attached, the format of acceptable identity documents, and the realistic processing timeline.

Who Needs an ITIN

The ITIN is for tax purposes only. It does not confer immigration status, work authorisation, or eligibility for Social Security benefits. The IRS issues ITINs to two broad categories of applicants. The first is non-resident aliens who are required to file a US federal tax return, file an information return, or claim a tax treaty benefit. The second is non-resident aliens who are listed as a spouse or dependant on a US citizen's or resident's return.

Pakistani applicants typically need an ITIN in one of these scenarios. They have bought or are buying US real estate and are receiving rental income that triggers US tax filing obligations. They are members of a US LLC or shareholders in a US S-corporation and need to be identified on the partnership or corporate return. They are receiving US-source royalties (for example, from authors, software developers or YouTube content) and want to claim the reduced withholding rate available under the US-Pakistan Income Tax Treaty. They are selling US real estate and need to file Form 8288-B to reduce FIRPTA withholding. They are spouses or dependants of US-resident family members for whom an ITIN allows the family to claim certain credits.

ITIN, EIN and SSN: Three Different US Tax IDs

Pakistani applicants frequently confuse the three US federal tax identifiers. The distinction matters because filing the wrong application produces a rejection that costs weeks. The table below summarises which number applies to which situation.

Form W-7: The Core Application

The application is made on Form W-7, Application for IRS Individual Taxpayer Identification Number. The current version is the December 2024 revision, and applicants should always download the latest revision directly from the IRS website rather than relying on cached or third-party copies. The form asks for biographical information, the reason for applying (selected from boxes labelled a through h), and the supporting documents being submitted.

Box selection matters. Each box corresponds to a different IRS rule for what additional documents must be attached. Box (a) is for non-resident aliens required to file a US tax return. Box (b) is for non-resident aliens claiming a treaty benefit. Box (c) covers US-resident aliens (which Pakistani applicants generally do not qualify under). Box (d) covers dependants of US citizens or residents. Box (e) covers spouses. Box (f) covers non-resident students, professors and researchers. Box (g) and (h) cover specific exception categories. Choosing the wrong box almost guarantees a rejection or processing delay.

The Tax Return Question

The default rule under Treasury Regulation 301.6109-1 is that Form W-7 must be filed with a completed US federal tax return. The IRS will not issue an ITIN purely on request. However, there are five specific Exception categories where a tax return is not required. These are the right route for many Pakistani applicants and are often missed because they sit at the back of the W-7 instructions.

Exception 1 covers passive income subject to third-party withholding (interest, dividends, rental income, partnership distributions). Exception 2 covers wages, salary or scholarship income subject to third-party withholding. Exception 3 covers mortgage interest reporting on a US loan. Exception 4 covers dispositions of US real property interests under FIRPTA. Exception 5 covers Treasury Decision 9363 reporting on US-source income.

For each Exception, specific supporting documents must accompany the W-7 in place of the tax return. Exception 1(d) (rental income from US property), for example, requires a signed statement from the withholding agent (typically the property manager or rental platform) confirming the type and source of income. Exception 4 (FIRPTA) requires a copy of the contract of sale and the buyer's ITIN or EIN. Pakistani applicants who try to use an Exception without producing the matching evidence are routinely refused.

Identity Documents: Originals or Certified Copies

The IRS accepts a defined list of identity documents. The most efficient single document is a valid passport, which alone proves both identity and foreign status. Other acceptable documents (national identity card, driving licence, US visa, foreign voter registration card, civil birth certificate, medical records and school records for dependants) must be paired with at least one document proving foreign status if the document does not establish both.

The IRS does not accept photocopies, even if notarised. There are three ways to satisfy the document requirement. The first is to mail the original passport to the ITIN Operations centre in Austin, Texas. The IRS undertakes to return the passport within 60 days, which most applicants find unacceptable in practice. The second is to obtain a certified copy of the passport from the Passport Office of Pakistan, which is the agency that issued it; the certification must be original (not a photocopy of a previous certification) and must include an embossed seal. The third, and the route LexForm recommends, is to use a Certified Acceptance Agent.

Certified Acceptance Agents (CAA): The Practical Route

A Certified Acceptance Agent is an individual or firm authorised by the IRS to verify identity documents and submit Form W-7 with a Certificate of Accuracy (Form W-7 COA) on behalf of an applicant. The CAA inspects the original passport in person, retains a certified record, and forwards the W-7 to the IRS without the original document needing to leave Pakistan or the applicant's hands.

The benefits are practical: the original passport never leaves Pakistan, processing is generally faster because the IRS does not need to verify documents internally, and the CAA's involvement signals to the IRS that the identity verification has been done by an authorised party. CAAs are listed publicly on the IRS website. Most operate by appointment and most charge a service fee separate from any legal advisory fee.

For Pakistani applicants, a CAA in the UK, US, or one of the limited Pakistan-accredited offices is the most efficient path. LexForm coordinates with verified CAAs and provides the legal advisory work (box selection, Exception category analysis, treaty benefit claims) while the CAA performs the document certification.

Where to Submit

If the application is mailed directly (without a CAA), it goes by US Postal Service to: Internal Revenue Service, ITIN Operation, P.O. Box 149342, Austin, TX 78714-9342. For private courier services like FedEx, UPS or DHL, the address is: Internal Revenue Service, ITIN Operations, Mail Stop 6090-AUSC, 3651 South Interregional Highway 35, Austin, TX 78741-0000. The Mail Stop reference matters for couriers because the bulk receiving facility uses it to route correctly.

Applications routed through a CAA are typically submitted by the CAA either through the same Austin address or through a designated submission process. The CAA tracks the application and notifies the applicant when the ITIN is issued.

Processing Times

The IRS publishes an indicative processing window of seven weeks for domestic applications and nine to eleven weeks for overseas applications, including those filed from Pakistan. Applications filed during peak filing season (15 January to 30 April) typically take longer because the ITIN Operations unit also handles a heavy volume of W-7s attached to first-time tax returns. Applications filed in May, June or July tend to clear faster.

Applicants do not get progress updates from the IRS during processing. The first communication is usually the issuance letter (CP565 if approved, CP566 if more information is needed, CP567 if rejected). For applicants relying on the ITIN to meet a tax filing deadline, this delay matters: filing the return after the deadline because the ITIN was not yet issued does not avoid the late-filing penalties unless the W-7 was attached to the return on time.

Renewal and Expiration

ITINs that have not been used on a US federal tax return for three consecutive years expire and must be renewed before they can be used again. ITINs with middle digits 70 to 88 (issued before 2013) have already expired in earlier rounds and must be renewed if the holder is filing again. The renewal process uses the same Form W-7, with the ITIN renewal box checked. Renewals do not require a tax return to be attached if the holder previously qualified under an Exception, but the same supporting documents and identity verification rules apply.

For applicants planning long-term US activity (rental property held for years, ongoing investment income, ongoing partnership interest), it is sensible to file a return or information report each year even where one is not strictly required, simply to keep the ITIN active and avoid the renewal cycle.

Common Reasons Applications Are Refused

The most frequent grounds for rejection that we see on Pakistani applications are: wrong box selected on the W-7 (claiming an Exception that does not match the supporting documents), photocopied identity documents (only originals or properly certified copies are accepted), Exception category supporting documents missing or incomplete (a property manager letter without the required content, for example), names that do not match between the W-7 and the passport (transliteration variations of Pakistani names, particularly the order of given names), and applications submitted alongside tax returns that contain calculation errors triggering rejection of the whole package.

One trap that catches Pakistani business owners: when the ITIN is for a partnership or LLC member, the partnership return must already have been filed (or be filed simultaneously) with the partner's K-1 attached. Submitting a W-7 in advance of the partnership return is a common mistake that triggers Notice CP566 asking for the missing return, adding weeks to the timeline.

A Word on How This Work Should Be Handled

An ITIN application is a tax submission to the Internal Revenue Service, governed by Treasury Regulation 301.6109-1 and the W-7 instructions. It is not a clerical task. The wrong reason box can produce a rejection. Exception category supporting documentation that does not match the IRS list will produce a rejection. A name transliteration that does not match the passport exactly, a photocopied identity document where the IRS requires an original or certified copy, or a tax return submitted with the W-7 that contains calculation errors will all produce rejections. Each rejection adds nine to eleven weeks to the timeline, and during that time the applicant continues to bear maximum-rate withholding on US-source income, miss filing deadlines, or accrue late-filing penalties.

For Pakistani applicants there is an additional layer: the application sits at the intersection of US federal tax law, the US-Pakistan Income Tax Treaty, and Pakistani document conventions. A Pakistani passport's transliteration of an Urdu name, the order in which given names appear, and the format of supporting documents from Pakistani institutions all need to be handled in a way that aligns with IRS expectations. This is one of the situations where an unfamiliar caseworker is reviewing a familiar form, and the clearer the submission, the faster the result.

LexForm prepares ITIN applications as legal work. The reason box is selected only after the underlying tax position has been confirmed. Exception category claims are supported with the matching documentation under the W-7 instructions. Treaty benefit positions are drafted with reference to the US-Pakistan Income Tax Treaty and the relevant Tax Court interpretations. Document certification is handled through Certified Acceptance Agents so the original passport remains in the applicant's possession at every stage. Where the ITIN sits inside a larger picture, including LLC formation, EIN application, FIRPTA compliance on US property sales, or annual federal returns, we coordinate the entire workflow rather than treating the W-7 in isolation.

The right first step is a short scoping call: we identify the correct W-7 box, confirm whether you qualify for an Exception, and tell you what your application looks like in time and cost. There is no fee for the initial scoping.