Federal Contracting Acronym
PIID
Procurement Instrument Identifier
Plain-English definition
The PIID is the unique identifier for a federal contract, agreement, or order reported in FPDS and USAspending. Registration and classification identifiers connect vendor records, solicitations, and federal spending data. Accurate codes and active registrations are prerequisites to bid and get paid.
Why it matters
PIIDs uniquely identify contract actions for mods, invoices, and past-performance citations.
Where you will see it
Award notices, modification SF 30 headers, and USAspending contract pages.
Example in context
A proposal cites past performance using the PIID from the CPARS narrative for the referenced contract.