Cost Allowability Fundamentals: Document Purpose, Allocation, and Approval

Cost allowability disputes often start with incomplete documentation rather than obviously improper spending. A practical readiness baseline is to document business purpose, funding source, allocation method, timing, approvals, and supporting evidence at the point of transaction. Train reviewers to ask the same small set of questions every time and store the answers with the transaction record. This creates a stronger record for internal review, external monitoring, and audit response, and helps reduce questioned costs tied to preventable documentation gaps.

The Regulatory Basis

Sections 2 CFR 200.403 through 200.405 establish the general criteria for cost allowability under federal awards. A cost must be necessary and reasonable, allocable to the award, consistent with policies that apply uniformly to both federally funded and other activities, and adequately documented. Section 200.403 covers factors affecting allowability, 200.404 addresses reasonable costs, and 200.405 covers allocable costs. Auditors test these criteria by examining transaction records and asking whether the documentation supports each element at the time of the expenditure.

Cost Allowability Checklist

• Business purpose documented at point of transaction
• Funding source identified and confirmed against budget
• Allocation method recorded (direct charge or cost allocation basis)
• Timing verified (cost incurred within the period of performance)
• Prior approval obtained where required by the award terms
• Supporting evidence attached (receipts, invoices, timesheets, travel authorizations)
• Consistent treatment confirmed (same type of cost treated the same across funding sources)
• Authorization signatures obtained per internal policy

Strengthening cost documentation at the point of transaction is one of the most direct ways to reduce questioned costs. When each expenditure record answers the basic allowability questions on its own, the organization is better positioned for both routine monitoring and formal audit.