What is a cost-plus contract?

A cost-plus contract reimburses the consulting firm for allowable costs incurred plus a predetermined fee or percentage representing profit. Common in government contracting, cost-plus arrangements transfer financial risk to the client while guaranteeing contractor profit margin. Variations include cost-plus-fixed-fee (CPFF), cost-plus-incentive-fee (CPIF), and cost-plus-award-fee (CPAF), each with different profit-determination mechanisms.

Key characteristics

• Client reimburses allowable costs plus agreed-upon profit margin

• Risk transferred from contractor to client

• Requires detailed cost tracking and documentation

• Subject to audit of cost allowability (especially government contracts)

• Profit margin is typically 8-15% for government cost-plus contracts

• Appropriate when scope uncertainty makes fixed pricing impractical

Why it matters for service firms

Cost-plus contracts provide guaranteed margins and eliminate delivery risk, but require sophisticated cost accounting systems. For consulting firms pursuing government work, cost-plus arrangements often apply to research, development, and complex advisory services where requirements can't be precisely defined upfront—the trade-off: lower profit potential (capped fees) for reduced risk. Firms must maintain compliant accounting systems, as government cost-plus contracts are subject to audit and disallowance of unreasonable costs.

Real-world example

Meridian Consulting wins a cost-plus-fixed-fee federal advisory contract. Structure: reimbursement of allowable direct and indirect costs plus a $85,000 fixed fee on an estimated $600,000 cost base (14.2% fee rate). The firm bills $620,000 in expenses over 18 months (slightly higher than the estimate due to an expanded scope) and receives the full $85,000 fee. Total payment: $705,000. Had this been a firm-fixed-price contract at $685,000 (original estimate plus fee), the $20,000 cost overrun would have reduced the margin. The cost-plus structure protected the firm while still providing meaningful profit. However, the firm invested $15,000 in enhanced cost accounting systems to meet compliance requirements.