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Although the original purpose for the number was for the Social Security Administration to track individuals, [1] the Social Security number has become a de facto national identification number for taxation and other purposes. [2] A Social Security number may be obtained by applying on Form SS-5, Application for a Social Security Number Card. [3]
Prior to 1 January 2004, a separate social security number (also the old IC number in format 'S#####', S denotes state of birth or country of origin (alphabet or number), # is a 9-digit serial number) was used for social security-related affairs.
An Individual Taxpayer Identification Number (ITIN) is a United States tax processing number issued by the Internal Revenue Service (IRS). It is a nine-digit number beginning with the number “9”, has a range of numbers from "50" to "65", "70" to "88", “90” to “92” and “94” to “99” for the fourth and fifth digits, and is formatted like a SSN (i.e., 9XX-XX-XXXX). [1]
Out of the 280 million Social Security numbers the firm studied across its network of databases, More than 20 million people have more than one number associated with their name.
Internal Revenue Code section 6109(d) provides: "The social security account number issued to an individual for purposes of section 205(c)(2)(A) of the Social Security Act [codified as 42 U.S.C. § 405(c)(2)(A)] shall, except as shall otherwise be specified under regulations of the Secretary [of the Treasury or his delegate], be used as the ...
The common format for social security numbers is 123-45-6789. Effective June 2011, the US military has introduced a plan to eliminate the use of Social Security Numbers on military and dependent ID cards and replace them with a service number, in an effort to prevent identity theft against members of the armed services. [ 7 ]
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Therefore, systems that pad to a specific number of digits (by converting 1234 to 0001234 for instance) can perform Luhn validation before or after the padding and achieve the same result. The algorithm appeared in a United States Patent [ 1 ] for a simple, hand-held, mechanical device for computing the checksum.