FAR Part 31 establishes cost principles for government contracts. Defines allowable, allocable, and reasonable costs. Lists specific cost categories as allowable or unallowable (e.g., entertainment is unallowable).
is a regulation concept federal contractors and grant writers run into across solicitations, regulations, and award filings
FAR Part 31 is part of the federal regulatory framework that governs procurement, performance, or compliance. For contractors, FAR Part 31 is not just background — it shapes solicitation language, evaluation criteria, source-selection authority, and what counts as compliant performance. Understanding when FAR Part 31 applies and (more importantly) when it doesn't apply is the difference between a proposal that's competitive within its actual constraint set and one that over-engineers compliance. Contracting officers use FAR Part 31 as common vocabulary, so reading their decisions, modifications, and source-selection memoranda gets easier when the regulation is in your working memory. Pair FAR Part 31 with the related terms above to see how it interacts with adjacent regulatory mechanisms.
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