To renew an expiring ITIN, you must submit a completed Form W-7, Application for IRS Individual Taxpayer Identification Number, provide your US federal tax return along with your valid supporting original or certified copies by the issuing agency, identification documents and any other required attachments. Applicants must also select the appropriate reason for needing the ITIN, as outlined in the Form W-7/W-7(SP) instructions. Mail the application to Internal Revenue Service, ITIN Operation, P. O. Box 149342, Austin, TX 78714-9342.
IRS Form W-7 - https://www.irs.gov/forms-pubs/about-form-w-7
