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Publication 4520, Acceptance Agents' Guide for Individual Taxpayer Identification Number (ITIN), provides guidance to agents authorized to assist alien individuals and other foreign persons in obtaining ITINs or EINs from the IRS.

Information for those needing a taxpayer identification number for a child who has been placed in their home pending final adoption.

Review the various  taxpayer identification numbers (TIN) the IRS uses to administer tax laws. Find the TIN you need and how to get it.

An ITIN is a 9-digit number the IRS issues if you need a U.S. taxpayer identification number for federal tax purposes, but you aren’t eligible for a Social Security number (SSN). Find if you need one and how to apply.

Overview of EIN requirements and procedures for tax-exempt organizations.

Apply to use the IRS Taxpayer Identification Number (TIN) Matching service. You can validate TIN and name combinations prior to submitting information returns.

Publication 5139, Employee Benefit Plans - Explanation Number 14 - Section 436 Limitations Defined Benefit Plans

Publication 5519, Economic Impact Payments: When Someone in Your Family Doesn't have a Social Security Number

Publication 1915 (SP), Understanding Your IRS Individual Taxpayer Identification Number (ITIN) (Spanish Version), discusses ITINs, which are tax processing numbers, issued by the Internal Revenue Service, for certain resident and nonresident aliens, their spouses, and their dependents.

IRS Publication 6149 contains multi-year projections of the number of tax returns to be filed with the IRS by state—as determined by the addresses on the tax returns.