Final indirect cost rates must be established based on which procedures?

Final indirect cost rates need to be established based on "Contracting Officer determination and auditor determination procedures" because this process ensures that the rates are verified through official assessments and compliance with contract guidelines and regulations.

When determining indirect cost rates, it is essential for Contracting Officers and auditors to examine the actual incurred costs and verify them against the proposed rates. This formal auditing process helps maintain integrity and accuracy in the financial dealings of government contracts. It allows for a thorough review of the contractor’s indirect cost allocation methodologies to ensure they align with applicable regulations and cost principles. This results in rates that are fair, reasonable, and reflective of true costs incurred during contract performance.

The other options involve different aspects of financial reporting or assessments that do not directly pertain to the established formal auditing and determination process necessary for indirect costs. They may provide useful context or background information, but they lack the official validation required to substantiate final indirect cost rates.