Each of these numbers serves a separate purpose for DoD contracting.
The CAGE Code (Commercial And Government Entity Code) is required because it is being used by current and legacy DoD Automated Information Systems to identify contractors doing business with the Department of Defense.
The DUNS (Data Universal Numbering System) is the identification number specifically selected for CCR because of it’s wide acceptance and recognition in the commercial marketplace. Both codes are used to validate CCR registration applications prior to completing the registration process.
The TIN (Taxpayer Identification Number) is required to facilitate electronic funds transfer and to comply with the Debt Collection Improvement Act, and for certain IRS 1099 income tax reporting requirements. (NOTE: Only certain finance and accounting personnel will have access to this privileged information. It will not be available to anyone else). For sole proprietorships, the TIN is either the owner’s Social Security Number, or EIN assigned to the business by IRS).
The TPIN (Trading Partner Identification Number) is similar to the personalized identification number (PIN) used to access private bank accounts. It is assigned after the CAGE and DUNS have been validated and the CCR registration is complete.