Special Item Number
SIN (Special Item Number) is a product/service category within the GSA Schedule. Each SIN defines the scope of what a contractor can sell through the schedule. Contractors must be awarded specific SINs.
(Special Item Number) is a contract type concept federal contractors and grant writers run into across solicitations, regulations, and award filings
SIN describes a specific contract structure that the federal government uses. The contract type controls risk allocation, payment timing, reporting cadence, and how performance is measured — all of which affect whether the work is profitable and whether it fits a contractor's capability profile. Knowing whether a solicitation is structured as a SIN versus another vehicle is one of the first signals of how the government expects the work to be executed and what kind of contractor they're trying to attract. Misreading the contract type can mean either over-pricing risk you don't actually carry or under-pricing risk you do. The related terms above name the adjacent vehicles SIN most commonly competes with or rolls up under.
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