Lesson 79 · The Grant Architect

79. The "Prudent Person" Test

30 min

By the end you'll be able to

  • Define the prudent person standard as written in 2 CFR 200.
  • Apply the standard to a real cost decision before submission.
  • Document the rationale for a cost at the time of the decision.
  • Recognize when a category-permitted cost still fails reasonableness review.

The Uniform Guidance does not give you a list of every allowable cost. It gives you a standard: a cost is reasonable if a prudent person, under the circumstances prevailing when the decision was made, would have incurred it. In this lesson you internalize that standard as the lens you will apply to every line in your budget before a federal auditor applies it for you.

You will learn how the test plays out in practice. A reasonable cost is necessary for the performance of the award, follows sound business practice, reflects arms-length pricing, and is consistent with the recipient's own policies for non-federal funds. Personal benefit, premium-priced vendors selected without competition, and lavish hospitality fail the test even when the underlying category (travel, food, equipment) is otherwise allowable. The question is not "Is this technically permitted?" The question is "Would a careful steward of public funds make this same choice?"

By the end you should be able to walk a colleague through a cost decision in real time, naming the prudence factors that justify (or eliminate) the line. You should also know that when in doubt, you document the rationale at the time of the decision, because the test asks what a prudent person would have done under the circumstances prevailing when the decision was made, not what a defensive person could argue later.

Common mistakes

These are the traps learners hit most often on this topic. Knowing them in advance is half the fix.

  • Justifying after the fact.

    Writing the rationale into the file after an auditor questions the cost is the wrong order. The prudent person standard is contemporaneous and the documentation has to be too.

  • Treating "allowable category" as "automatically reasonable."

    Travel, food, and conference registration are allowable categories that still fail the prudent person test when the specific charges are lavish. Category is not the same as amount.

Practice problems

Try each on paper first. Click Show solution only after you've made a real attempt.

  1. Problem 1
    A project director wants to book a 210. Apply the prudent person test and produce a written recommendation.
    Show solution

    The GSA per diem lodging rate is the reasonableness ceiling for federal travel. A premium nearly three times the rate fails the prudent person test on its face unless there is a documented, contemporaneous justification (conference hotel block sold out, security or accessibility needs, demonstrably no comparable lodging within practical distance). Recommend booking at or below GSA, or document the specific justification in writing before the trip and seek prior approval if the cost charged to the award will exceed GSA.

Practice quiz

  1. Question 1
    Under 2 CFR 200, when is a cost considered reasonable?
  2. Question 2
    Which factor does NOT typically support a finding of reasonableness?
  3. Reflection 3
    In one or two sentences, explain why documenting the cost rationale at the time of the decision matters more than documenting it after the audit letter arrives.

Lesson 79 recap

Reasonableness is a contemporaneous prudent-person standard. The cost has to be necessary, competitively priced, consistent with internal policy, and documented at the time of the decision.

Coming next: Lesson 80 — Allocable and Allowable

Next we separate the two tests that grant teams routinely conflate: allowability under regulation and allocability to a specific award.

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