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Glenn Hegar  ·  Texas Comptroller of Public Accounts

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:

SSN Exclusions
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
111111111 333333333 666666666 123456789

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 70 – 77 80 – 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
01 02 03 04 05 06       10
11 12 13 14 15 16       20
21 22 23 24 25 26 27     30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48   50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68    
71 72 73 74 75 76 77     80
81 82 83 84 85 86 87 88   90
91 92 93 94 95     98 99  

Note: The Check-Digit Calculator also uses the SSN, ITIN and EIN validation rules.

Glenn Hegar
Texas Comptroller of Public Accounts
Questions? Contact statewide.accounting@cpa.texas.gov
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