How do cost principles influence CO/AO payments?

• A. They determine allowability, reasonableness, and allocability of costs claimed.
• B. They determine the total amount of funds available.
• C. They set the vendor's billing rate.
• D. They establish the contract term.

Answer: (A)

Cost principles guide what the government will reimburse on a federal project by applying three checks to each claimed cost: allowability, reasonableness, and allocability. Allowability means the cost is permitted under the award and applicable regulations, properly documented, and not specifically disallowed. Reasonableness means the cost is appropriate under the circumstances—what a prudent person would incur in similar situations and terms. Allocability ensures the cost benefits the award and can be tied to the specific project or activity, whether as a direct cost charged to that project or as an indirect cost allocated through approved methods. Together, these criteria determine what gets paid to the contractor or grantee, rather than simply reflecting a budget, a vendor’s billing rate, or the contract term.