Before you apply
Count tax years rather than years since issue
Finding an old assignment letter is useful, but its age alone does not answer the non-use question. Gather the federal returns for the relevant years and check whether your ITIN appeared on them. Do not count a conversation with a bank as tax-return use.
The IRS rule is three consecutive tax years of non-use, with expiry on December 31 after the third tax year.IRS Mark the tax year of each return, not only the calendar year when you sent it. A late filing date and the year reported on the form are different facts.
For example, if the number had no federal-return use for tax years 2022, 2023 and 2024, review the expiry at the end of that third year before a later return. If you find an overlooked return in the file, bring it to the preparer rather than relying on memory.
Record how the ITIN was used on a family return too. An applicant's own return is not the only document worth checking. Keep the full copy of the filed return so the reviewer can see the identifier and the relevant person.
Before you apply
A payer’s information form does not mean renewal is due
The IRS permits expired ITINs to remain in use on information returns, including Form 1099.IRS Distinguish a third party reporting a payment from you filing an individual federal income-tax return.
If a bank asks whether the ITIN is current, clarify the form and purpose. Bring the actual message to the preparer. Do not infer a federal renewal requirement simply because a system uses the word expired or asks for a tax ID.
If you later need to file a federal return, revisit the renewal question at that point. The information-return rule does not make an expired number valid indefinitely for your own return.IRS Keep the payment documents because they may help establish that later filing need.
Also check whether the number you found is actually an ITIN. A company EIN, personal SSN and foreign tax identifier have different rules. The ITIN versus EIN guide explains the holder distinction.
Before you apply
Review expiry before expecting a refund or credit
A return using an expired ITIN can face processing delays and affected credits; the IRS warns that this can lead to a reduced refund, penalties or interest.IRS Check the number while assembling the return instead of discovering the issue after submission.
The number does not itself guarantee a credit. A dependent or spouse must have the applicable filing purpose or allowable tax benefit.IRS Review both eligibility and renewal and assess the items claimed separately from the identifier.
If the filing deadline is approaching, ask about the extension and payment procedure. The IRS says an ITIN is not needed merely to request an extension or make estimated tax payments.IRS Those actions do not replace the eventual return and eligible renewal packet.
If you have since obtained an SSN, do not renew the ITIN.IRS Tell the preparer about the change so the correct identifier is used and old records are retained for reference.