SSN / ITIN / EIN Validation Rules
TINS validates the Social Security number (SSN), Individual Taxpayer Identification Number (ITIN) and Employer Identification Number (EIN) using the criteria set by the Social Security Administration (SSA) and Internal Revenue Service (IRS). The validation process applies to a payee master setup for the payee, sole owner and individual partner identification numbers, but does not include a match to a name.
Agencies are responsible for ensuring that accurate information is submitted in TINS. Agencies may request supporting documentation, such as copies of SSN cards or pre-printed IRS documentation, to verify vendor information prior to TINS processing. See Recommended Documentation Requirements in Security Recommendations.
Social Security Number (SSN) Rules
The Social Security Administration (SSA) “SSN Randomization” assignment methodology protects the integrity of SSNs. SSA eliminated the geographical significance of the first three digits of the SSN, referred to as the area number, by no longer allocating the area numbers for assignment to individuals in specific states. SSA also extended the available pool of nine-digit numbers in every state. The following list identifies exclusions of invalid SSNs:
|Area Numbers (first 3 digits)||000||666||900 – 999 (see ITINS)|
|Group Numbers (4th / 5th digits)||00|
|Serial Numbers (last 4 digits)||0000|
Additionally, TINS prevents the use of the following invalid nine-digit SSNs:
|Additional Invalid SSNs|
Individual Taxpayer Identification Number (ITIN) Rules
The IRS assigns ITINs 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. An ITIN is a nine-digit number that always begins with the number nine and includes the following ranges for the fourth and fifth digits that identify valid ITINs:
|Valid ITIN Ranges for 4th / 5th Digits|
|50 – 65||83 – 88||90 – 92||94 – 99|
Employer Identification Number (EIN) Rules
The IRS is responsible for the issuance of an EIN. The following list represents the valid EIN prefixes, which are the first two digits of the nine-digit EIN. See How EINs are Assigned and Valid EIN Prefixes.
|Valid EIN Prefixes|
Note: The Check-Digit Calculator also uses the SSN, ITIN and EIN validation rules.