What an Incurred Cost Audit Examines
An auditor generally begins with the contractor's general ledger and incurred cost submission, then traces selected amounts to supporting records. The review can cover direct costs, indirect costs, labor, materials, subcontractors, travel, overhead, and other expense categories.
The audit also considers whether costs were consistently classified and allocated across contracts and other business activities. A transaction that appears reasonable in isolation may require further review if it was assigned to the wrong contract, cost pool, or accounting period.
- Direct costs: Costs specifically identifiable with a contract or final cost objective.
- Indirect costs: Shared expenses allocated using established and consistently applied methods.
- Labor costs: Employee time, labor distribution, rates, and supporting payroll records.
- Materials and subcontract costs: Purchasing records, invoices, receipts, and contract-related documentation.
- Period-end costs: Accruals and adjustments used to present costs in the appropriate accounting period.
Cost Classification and Allowability
A central part of an incurred cost review is determining whether claimed amounts satisfy applicable allowability, allocability, and accounting requirements. Contractors need clear evidence showing why a cost belongs in a particular contract or indirect cost pool.
For example, Business Expense Incurred may represent a legitimate business expenditure, but its treatment for government contract purposes depends on its nature, documentation, allocation method, and applicable contract requirements. Similarly, Employee Expense Incurred may require receipts, approvals, business purpose documentation, and appropriate accounting classification before it can be included in an incurred cost claim.
Consistent Cost Governance helps finance teams establish approval, classification, documentation, and review practices that support defensible cost reporting throughout the contract lifecycle.
Procurement and Vendor Cost Evidence
Procurement records are important because material and subcontract costs often originate outside the accounting ledger. Auditors may compare requisitions, purchase orders, receiving records, invoices, approvals, and payment records to verify that reported costs are supported.
Strong procurement controls help connect purchasing activity to contract requirements, authorized spending, and accounting records. A purchase order can provide evidence of what was ordered, which supplier was selected, the approved amount, and the relevant cost objective.
A Purchase Order Inventory Management System can further connect purchase order information with inventory and vendor records, supporting visibility into materials and procurement-related costs. For audit evidence, Audit Trails For PO can show the sequence of actions surrounding purchasing approvals and changes.
Accruals, Payments, and Audit Trail Evidence
Period-end accounting is another important audit area because costs may be incurred before invoices or payments are processed. Finance teams need to demonstrate how estimates were established, reviewed, adjusted, and ultimately reconciled with actual transactions.
For example, accruals should be supported by a documented basis and appropriate period assignment. Payment records also help auditors connect approved obligations to actual cash outflows. Reviewing a vendor payment can therefore provide evidence about authorization, payment timing, invoice matching, and the relationship between recorded liabilities and settled amounts.
Payment controls can also incorporate Early Payments Recommendations when evaluating whether payment timing aligns with approved vendor terms, available discounts, cash requirements, and authorization policies.
Where receivables and customer payments intersect with contract accounting, AR Automation Software can automate collection followups and payment-to-invoice matching, supporting processes designed to reduce DSO by 40% and reconciliation cost by 80%.
Procurement Controls and Transaction Integrity
Auditors may examine whether purchasing workflows prevent duplicate requests, unauthorized spending, and inconsistent approvals. These controls become particularly useful when multiple departments or cost centers purchase similar goods or services.
A Duplicaton Check can compare purchase requests with current inventory and existing requests across cost centers to identify potential duplicate requisitions before additional purchasing activity occurs. Such checks strengthen the connection between procurement records and the costs ultimately presented for government contract purposes.
Finance teams should also retain approval records, source documents, receiving evidence, invoice support, and accounting entries in a way that allows transactions to be traced from initiation through reporting.
Preparing for an Incurred Cost Audit
Preparation is most effective when audit evidence is maintained continuously rather than assembled only when an audit begins. Finance and contracts teams can reconcile the general ledger to incurred cost schedules, review indirect allocation methods, verify supporting documentation, and investigate unusual account movements.
- Reconcile reported contract costs to the general ledger and supporting schedules.
- Review direct and indirect cost classifications for consistency.
- Validate labor distribution and timekeeping records against payroll and contract assignments.
- Maintain procurement, invoice, receipt, approval, and payment documentation.
- Document accrual calculations, adjustments, and period-end reconciliations.
- Retain clear audit trails showing transaction approvals and accounting changes.
Summary
An Incurred Cost Audit evaluates whether a contractor's reported costs are accurate, properly classified, adequately supported, and appropriately allocated to government contracts. Effective preparation depends on reliable accounting records, consistent cost allocation, strong procurement controls, documented accruals, traceable transactions, and organized audit evidence. These practices help contractors support financial reporting and make informed decisions about contract costs and compliance.