You may have an ITIN number that may expire before your tax return is processed. Be advised that all ITINs that are not used for tax reporting purposes expire if they are not used once in three years. Some numbers expire on December 31, 2019. I am a top legal business specialist in the field, and can help you secure your ITIN for tax reporting purposes. Contact me at sam@mollaeilaw.com for further details. To renew you number, you will need to submit a form W-7 and attach your identification documentation.