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The TIN matching service lets payers or authorized agents verify taxpayer identification numbers and name combinations before submitting information returns.

This page discusses U.S. Taxpayer Identification Number Requirements.

Publication 1635, Understanding Your EIN, provides general information on Employer Identification Numbers (EINs).

Information about Form W-9, Request for Taxpayer Identification Number (TIN) and Certification, including recent updates, related forms, and instructions on how to file. Form W-9 is used to provide a correct TIN to payers (or brokers) required to file information returns with IRS.

IRS Publication 6186 contains multi-year projections of the number of tax returns to be filed with the IRS by the calendar year of filing.

IRS Publication 6292 contains multi-year projections of the number of tax returns to be filed with the IRS by fiscal year of filing.

Information about Form SS-4, Application for Employer Identification Number, including recent updates, related forms, and instructions on how to file. Form SS-4 is used by sole proprietors, corporations, partnerships, estates, trusts, and other entities to apply for an EIN.

Publication 5261, ITIN Outreach Products, provide information on changes made to the Individual Taxpayer Identification Number (ITIN) program.

Application procedures for becoming an Acceptance Agent for IRS ITIN Numbers.

Generally aliens may apply for either a Social Security number (SSN) or an Individual Taxpayer Identification Number (ITIN) for use on tax related documents.