Tax Identification Number (TIN) in Procurement

A Tax Identification Number (TIN) is the federal tax identifier -- either an Employer Identification Number (EIN) issued by the IRS or, for individuals operating as sole proprietors, a Social Security Number (SSN) -- that a contractor must provide when registering in SAM.gov and when establishing electronic payment information. The TIN is used to validate the contractor's identity against IRS records during registration and to ensure that federal payments are correctly reported for tax purposes.

What is a TIN in Procurement?

The TIN requirement in federal contracting flows from two distinct regulatory sources. First, FAR 4.1102 and the SAM.gov registration process require that an entity's legal name and TIN match IRS records exactly. GSA submits the name-and-TIN combination to the IRS for validation during the SAM registration and renewal process. If the name in SAM.gov does not match the name on file with the IRS for that EIN -- even a minor discrepancy such as "Inc." versus "Incorporated" -- the validation fails and the registration cannot activate until the discrepancy is resolved.

Second, FAR 52.204-3 (Taxpayer Identification) requires contractors to provide their TIN on invoices and to include it in contract representations. The contracting officer uses the TIN for IRS 1099 reporting of contract payments made to vendors who are not corporations. For corporations, TIN information flows through the payment system (IPPS or WAWF/IPP) to support financial reporting and compliance.

Sole proprietors who register in SAM.gov and do not want to expose their SSN may apply for an EIN from the IRS for business purposes -- using a business EIN in SAM.gov is both permitted and advisable for privacy reasons. Changes to a TIN (such as after a corporate restructuring or acquisition) require updating the SAM registration and notifying contracting officers, as the payment system routes payments by TIN.

Why it matters for contractors

TIN mismatches are among the most common causes of SAM registration delays. Because the IRS validation step is not instantaneous, a discrepancy can add one to three weeks to the registration or renewal timeline. Contractors must ensure that the legal name in SAM.gov matches the IRS business master file exactly -- including punctuation, spacing, and abbreviations -- before submitting the registration. The IRS online TIN matching tool is available to verify the name-TIN combination before submitting to SAM.gov.

Payment delays can also result from TIN errors. If the TIN in the payment system does not match the contractor's IRS records, the Treasury Department's payment processing systems may flag or reject the payment, requiring manual resolution between the agency finance office and the contractor.

Example

A consulting firm organized as an LLC applies its operating name ("Acme Consulting LLC") in SAM.gov but its EIN was issued by the IRS under the name "Acme Consulting, LLC" (with a comma). The IRS validation fails. The firm contacts its CPA to confirm the exact IRS name, corrects the SAM entry to add the comma, and resubmits. The validation clears in four business days and the registration activates. The firm then uses the IRS TIN matching tool before its next annual renewal to prevent the same delay.