Federal glossary · Contract type
A Letter Contract (FAR 16.603) is a preliminary contractual instrument that authorizes the contractor to begin work immediately. Must be definitized within 180 days. Used for urgent requirements.
Example: A 5-year IDIQ with task orders or a GSA Schedule purchase.
Reference record · Sources: Federal Acquisition Regulation · Verified Jul 2, 2026 · Covers definition, governing source
Also known as
A Letter Contract (FAR 16.603) is a preliminary contractual instrument that authorizes the contractor to begin work immediately. Must be definitized within 180 days. Used for urgent requirements.
is a contract type concept federal contractors and grant writers run into across solicitations, regulations, and award filings
Letter Contract describes a specific contract structure that the federal government uses. For example: Example: A 5-year IDIQ with task orders or a GSA Schedule purchase. 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 Letter Contract 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 Letter Contract most commonly competes with or rolls up under.
Example: A 5-year IDIQ with task orders or a GSA Schedule purchase.
Meaning in practice
Letter Contract describes how the government structures the work, price, and risk.
Where you’ll see it
You will see it in solicitations, CLIN schedules, pricing tables, and award summaries. Example: Example: A 5-year IDIQ with task orders or a GSA Schedule purchase..
Common confusion
People often confuse a contract type with a vehicle, a task order, or a program name.
What to do next
Check payment timing, scope, and risk allocation before you bid or price the work.
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