what itins expire
ITINs with middle digits 70, 71, 72 or 80 are set to expire at the end of 2017. The notice being mailed -- CP-48 Notices, You must renew your Individual Taxpayer Identification Number (ITIN) to file your U.S. tax return -- explains the steps taxpayers need to take to renew the ITIN if it will be included on a U.S. tax return filed in 2018.