Taxpayer Identification Number
identifier for a taxpaying entity in the United States
Social Security number
nine-digit number issued to U.S. citizens, permanent residents, and temporary working residents
Preparer Tax Identification Number
identification number that all paid tax return preparers must use on U.S. federal tax returns
Individual Taxpayer Identification Number
United States tax processing number
Employer Identification Number
number assigned by the United States Internal Revenue Service to all employers