FMX Home
Glenn Hegar  ·  Texas Comptroller of Public Accounts

Check-Digit Calculator

Select EIN, SSN or ITIN:
Note: This tool will not generate 7 numbers for SSNs or ITINs. However, this tool does validate the 9-digit EIN, SSN and ITIN based on the SSN / ITIN / EIN Validation Rules.

The Check-Digit Calculator uses a nine-digit base number to calculate a unique 11-digit Texas Identification Number (TIN).

An 11-digit TIN has three components: the one-digit prefix number, nine-digit base number and one-digit self-check number. The nine-digit base number is usually a Federal Employer Identification Number (EIN), Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN). TINS randomly assigns an 11-digit number for SSNs and ITINs that begin with 7.

The Check-Digit Calculator calculates a TIN number based on the EIN, SSN or ITIN for reference purposes only. Before a payee can receive payment from the state of Texas, the payee must be set up in the Texas Identification Number System (TINS) via the online or batch (EFT) process.

See TexPayment Resource for more information.

Glenn Hegar
Texas Comptroller of Public Accounts
Questions? Contact
Comptroller.Texas.Gov | FMX
FMX Sitemap | Contact FM
Accessibility Policy | Privacy and Security Policy