Taxpayer Data Protection Act

This bill restricts access to Treasury payment systems (including the Bureau of the Fiscal Service) to only Treasury employees with a "fully successful" performance rating and at least one year of civil service, or contractors/outsiders with security clearances, required privacy/cybersecurity training, ethics agreements, and no conflicts of interest. It treats non-government users accessing these systems as government employees for ethics rules and defines specific actions (like stopping payments) as "personal and substantial participation" in government matters. The Treasury Inspector General must investigate any unauthorized access within 30 days and report to Congress, detailing the breach, security risks, and any halted payments. The bill directly affects Treasury staff, contractors, and any external entities accessing federal payment systems.