TINCheck is an online service that specializes in the validation and verification of Taxpayer Identification Numbers (TINs), such as Social Security Numbers (SSNs) and Employer Identification Numbers (EINs), against government databases including the IRS. It is designed to help businesses ensure the accuracy of TINs for compliance purposes, reducing the risk of penalties associated with incorrect tax filings. The platform also provides additional services such as name matching, death master file verification, and Office of Foreign Assets Control (OFAC) checks.