“This document contains proposed regulations that create a new taxpayer identifying number known as an IRS truncated taxpayer identification number, a TTIN. As an alternative to using a social security number (SSN), IRS individual taxpayer identification number (ITIN), or IRS adoption taxpayer identification number (ATIN), the filer of certain information returns may use a TTIN on the corresponding payee statements to identify the individual being furnished a statement. The TTIN displays only the last four digits of an individual’s identifying number and is shown in the format XXX-XX-1234 or ***-**-1234. These proposed regulations affect filers of certain information returns who will be permitted to identify an individual payee by use of a TTIN on the payee statement furnished to the individual, and those individuals who receive payee statements containing a TTIN.”