United States Tax ID Numbers
Social Security Number (SSN)
For Individuals, Example: 536-80-4398
A social security number is in the following format: NNN-NN-NNNN. The first three digits have geographical significance, the next two digits have no real significance and are issued sequentially, and the last four digits are random.
Individual Taxpayer Identification Number (ITIN)
For Individuals, Example: 912-91-3457
An ITIN is a nine-digit number that always begins with the number 9 and is in the following format: NNN-NN-NNNN. An ITIN is a tax processing number issued by the IRS to individuals who are required to have a U.S. taxpayer identification number but who do not have and are not eligible to obtain an SSN from the Social Security Administration.
Employer Identification Number (EIN)
For Entities, Example: 51-2144346
An EIN is in the following format: NN-NNNNNNN. An EIN is issued by the IRS to sole proprietors, partnerships, corporations (including limited liability corporations), and other entities for tax filing and reporting purposes.
Format Guide: N = Number; A = Letter; X = Number or Letter
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