What is a firm fixed price contract?

A firm-fixed-price contract establishes a set price for defined deliverables regardless of actual costs incurred, transferring financial risk from the client to the consulting firm. Unlike time-and-materials arrangements, where the client pays for hours worked, FFP contracts pay for outcomes. For consulting firms, FFP contracts offer profit upside when delivery is efficient but expose the firm to losses when projects exceed estimated effort.

Key characteristics

• Fixed payment for defined deliverables regardless of hours spent

• Client has budget certainty; consultant assumes cost risk

• Requires precise scope definition to manage risk

• Change orders required for out-of-scope work

• Higher potential margin than T&M when delivery is efficient

• Risk of losses when projects overrun or the scope is unclear

Why it matters for service firms

FFP contracts can significantly improve or damage a consulting firm's profitability, depending on estimation accuracy and scope management. Well-estimated FFP: 1,000 hours estimated, 850 hours actual at a $200/hour blended cost earns $30,000 in unexpected profit. Poorly estimated work with 1,200 hours actually loses $40,000. The key success factors: detailed scope with explicit exclusions, appropriate contingencies in estimates, rigorous change-order processes, and a willingness to decline FFP on poorly defined requirements.

Real-world example

Horizon Consulting wins a $240,000 firm-fixed-price engagement for strategic planning development. LOE estimate: 1,000 hours (blended rate of $240/hour). Internal cost budget: 1,000 hours at $95/hour loaded cost = $95,000, targeting $145,000 margin (60%). Actual delivery: 1,150 hours due to extended client decision cycles and additional stakeholder interviews. Actual cost: $109,250. Actual margin: $130,750 (54.5%), losing $14,250 versus plan. Post-project analysis: 100 hours of overrun attributable to unclear decision authority (should have been clarified upfront); 50 hours to stakeholder additions (should have been change ordered). Lessons applied to future FFP bids.