ITIN Renewal: Why Numbers Expire and How Rejections Happen
An Individual Taxpayer Identification Number is not permanent. It can expire from disuse, and a large number of people discover this at the worst possible moment: when a return filed with an expired number is processed without the credits or treaty benefits it was claiming, or when a real estate closing, a bank account opening, or another transaction stalls because the identification number attached to it is no longer valid.
What an ITIN is and why expiration exists at all
An ITIN is issued under IRC §6109 and Treas. Reg. §301.6109-1 to individuals who need a U.S. taxpayer identification number but are not eligible for a Social Security Number, most commonly non-resident individuals with U.S. tax filing or withholding obligations, dependents and spouses of U.S. taxpayers, and non-residents applying for a reduced withholding certificate or a treaty benefit. The Protecting Americans from Tax Hikes Act of 2015, generally referred to as the PATH Act, added IRC §6109(i), which built an expiration mechanism into the ITIN system that did not previously exist. Before the PATH Act, an ITIN, once issued, remained valid indefinitely regardless of use. Congress added expiration specifically to prevent large numbers of unused numbers from sitting active indefinitely, and to prompt periodic revalidation of the identity information behind each number.
How an ITIN expires
The ongoing mechanism, and the one that matters for most taxpayers going forward, is disuse. Under the rule implementing §6109(i), an ITIN that has not been included on a U.S. federal tax return as either the taxpayer's own number or a dependent's number for any of the three consecutive tax years preceding the current year generally expires as of the end of that third year. The number itself does not disappear from IRS records and is not reassigned to anyone else, but it stops being usable for filing purposes until it has been renewed.
Separately from the disuse rule, the IRS also ran a series of scheduled expiration rounds tied to the middle two digits of ITINs issued before 2013, described in IRS Notice 2016-48 and implemented in waves between 2017 and 2020, which retired large blocks of older numbers regardless of recent use, as part of transitioning the entire ITIN population onto the disuse-based rule going forward. Those historical middle-digit rounds are now complete, and the disuse rule described above is the mechanism that governs expiration today. The practical upshot for anyone holding an older ITIN is the same either way: a number obtained years ago and not used on a return recently should be checked before it is relied on for a return, a treaty claim, or a transaction.
What happens when a return is filed with an expired number
The return is generally still accepted and processed, which is exactly why the problem tends to go unnoticed until it produces a consequence. What actually happens is quieter and more expensive than an outright rejection: exemptions, credits, or treaty-based positions claimed using the expired ITIN can be disallowed on processing, and a notice follows explaining the adjustment. A taxpayer who was expecting a refund either does not receive it or receives one materially smaller than expected, and interest can begin accruing on any resulting balance due from the original filing deadline. Correcting the situation means renewing the ITIN and then addressing the return that was already filed, typically through an amended return or a response to the IRS notice, which is a longer and more expensive path than confirming the ITIN's status and renewing before the original return was ever filed.
Worked example
A non-resident individual obtained an ITIN in 2017 to claim a reduced withholding rate under a tax treaty on U.S.-source royalty income. The royalty arrangement ended in 2019, and the individual had no further reason to file a U.S. return until 2025, when they sold a small U.S. rental property and needed to report the sale. Because the ITIN had not appeared on a filed U.S. return for the three consecutive years from 2022 through 2024, it had expired by the time the 2025 sale needed to be reported. Filing the 2025 return using the old number without first renewing it would risk processing delays and potential disallowance of any treaty position claimed. The correct sequence was to submit a renewal Form W-7 well ahead of the filing deadline, confirm the renewed number, and only then file the return reporting the sale.
How to renew
Renewal is accomplished by submitting Form W-7 again, checked as a renewal application rather than a new application, together with the required identity documentation. The document standard for a renewal is the same as for an original application under Treas. Reg. §301.6109-1(d)(3): either the original identity document, most commonly a passport, or a copy certified by the government agency that issued it. A copy certified by a notary is generally not accepted as a substitute for either of those, which is a distinction that trips up a meaningful share of applicants who assume any certified copy will do.
Unlike a new application, a renewal generally does not need to be attached to a federal tax return, which is what makes it possible to renew ahead of the filing season rather than in the middle of it, when processing volumes are highest and turnaround times are longest. This is the single most useful piece of timing advice in this area: renewing before the number is actually needed for a filing is dramatically less stressful, and less risky to a deadline, than renewing while a return is waiting on the outcome.
Renewing for an entire family
Where several members of the same household hold ITINs that are expiring, or have already expired, they can generally be renewed together in a single submission rather than one at a time across separate filings. This is worth doing deliberately rather than reactively, because families frequently discover only one member's expired number, often because that person's number happens to be needed first for an immediate purpose, address that one problem in isolation, and then repeat the entire process months later when the next family member's number turns out to have expired as well.
Why renewals get rejected
Renewal applications are rejected for largely the same reasons original applications are, with the added wrinkle that a renewal sometimes carries assumptions forward from the original application that no longer fit the current situation.
| Rejection reason | What is actually happening |
|---|---|
| Notarized rather than certified documents | A notary's certification is not the same as certification by the government agency that issued the document; this remains the single largest cause of rejection |
| Name mismatch | The name on the application does not match the name on the identity document, or does not match the name previously associated with the ITIN; marriage, transliteration between alphabets, and differing name-order conventions all produce this |
| Incomplete dependent documentation | Certain dependents require additional proof, such as evidence of U.S. residency, beyond the identity document alone |
| Outdated reason code | The reason code carried forward from an earlier application no longer describes the current situation, such as a treaty-benefit reason code used for what is now a reportable sale |
| Missing required attachment | Where the current application actually does require an accompanying return or supporting form under the applicable exception, and it was not included |
What to do if a renewal is rejected
Read the rejection notice for the specific stated reason before resubmitting anything, because resubmitting the identical package produces the identical result. Most rejection notices identify a category of defect, such as document certification or a name mismatch, rather than pinpointing the single problematic document, so the more reliable approach is to review the entire submission against that category rather than guessing at which document caused the issue and replacing only that one.
Where the underlying obstacle is the passport itself, either because the applicant cannot be without it for the time an original submission or agency certification would take, or because certification by the issuing government is impractical from where the applicant is located, the Certifying Acceptance Agent route is the alternative worth pursuing, since a Certifying Acceptance Agent can verify the original passport in person and submit a certification in its place rather than requiring the document itself to travel. That route, what it authorizes an agent to do, and how it differs from a general acceptance agent that cannot certify documents at all, is a separate topic worth understanding on its own before choosing a provider to handle either an original application or a renewal.
It is also worth checking, before resubmitting, whether the rejection notice references a mismatch between the reason code on the renewal and the reason code originally used to obtain the ITIN. A number originally obtained to support a treaty-based withholding claim that has since ended, and is now being renewed to support the reporting of a real estate sale instead, should reflect the current reason for needing the number, not the original one carried forward automatically. Reviewing the applicable reason code list in the current Form W-7 instructions before resubmitting avoids a second rejection on a technical mismatch that has nothing to do with the identity documentation itself.
ITINs used for withholding and treaty claims, not just filing
Expiration is easy to overlook in this context specifically because an ITIN's most visible use for many non-resident individuals is not an annual tax return at all, but a number supplied to a withholding agent, such as a brokerage, a payer of royalties, or a closing agent on a real estate sale, to support a Form W-8BEN treaty claim or a reduced withholding rate. A withholding agent relying on a stale ITIN has no independent way to know the number has expired, and an expired number used to support a treaty position can result in the position being disallowed on examination even though nothing about the underlying treaty eligibility changed. Anyone who expects to rely on an ITIN for withholding purposes in the near future, rather than for filing a return in the immediate term, should still confirm the number is current, because the three-year disuse clock runs from the last year the number appeared on a filed return, not from the last time it was supplied to a withholding agent for a Form W-8BEN.
ITIN versus Social Security Number
An ITIN is specifically a fallback for individuals who are not eligible for a Social Security Number. If an individual's immigration status changes and they become eligible for a Social Security Number, for example through a change to lawful permanent resident status or work authorization, the correct step is to obtain the Social Security Number and then notify the IRS so that tax records are consolidated under the new number, rather than continuing to renew the ITIN indefinitely. Continuing to use and renew an ITIN after becoming eligible for a Social Security Number creates two identifiers on file for the same person, which can complicate matching of prior-year records and is worth resolving deliberately rather than leaving in place because the ITIN still technically works.
How to avoid repeating this
Two habits prevent most of this problem going forward. First, note the last tax year in which the ITIN actually appeared on a filed U.S. return, since that is the year the three-year disuse clock runs from, and check it periodically rather than assuming the number is still active. Second, where an ITIN exists in a household that files U.S. returns only occasionally, such as once every few years for an occasional transaction, treat checking and renewing that number as a task to handle in a quiet month well ahead of any anticipated filing, rather than something discovered only when a deadline is already close and a renewal is suddenly urgent.