An Individual Taxpayer Identification Number (ITIN) is a tax processing number issued to nonresident aliens (NRA) by the Internal Revenue Service. ITINs are a nine-digit number in the format (9XX-XX-XXXX), beginning with a “9”.  ITINs with middle digits (the fourth and fifth positions) “70,” through “88” have expired. ITINs with middle digits “90,” “91,” “92,” “94,”…