At concept level, you build a consulting fee the same way you build a workplan: bottom-up from people and time. Confidence has nothing to do with it. The core unit is the person-week: one person, staffed at a given FTE (full-time-equivalent fraction), for one week of the engagement. An FTE of 1.0 is fully staffed, and 0.3 is roughly a day and a half a week. A blended day rate by role turns person-weeks into money. Partner or Principal, Engagement Manager, Consultant and Analyst are each priced differently to reflect seniority and cost:
Fee (by role) = FTE × weeks on the engagement × day rate × working days per week.
Sum every role's fee and you have the engagement's cost build-up. That's the number the proposal's fee line is ultimately defended against, even when the client only ever sees the final figure. Worked Example 1 recomputes it in full for a real-shaped scenario. Hold on to the formula. It turns "we think this should cost about ₹1 crore" from a guess into a number you can defend line by line if a client asks.
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How can you structure a consulting fee?
Three commercial structures then decide who bears the risk that the estimate is wrong:
- Fixed-fee. One number for the whole SOW, however many hours the work actually takes. The firm bears the estimation risk. If the analysis runs long, the firm's margin absorbs it and the client's budget is untouched. Clients favor this when the deliverable is well defined and they want budget certainty.
- Time-and-materials (T&M). The client pays for actual hours or days worked, at agreed rates, typically with a not-to-exceed ceiling. Now the client bears more of the estimation risk. If the work runs long, the invoice grows. In exchange, the client doesn't overpay if it runs short. It suits early-stage diagnostics and exploratory work, where scope is hard to estimate up front.
- Value-based / success fee. Some or all of the fee is tied to a measured outcome, such as a percentage of realized cost savings or a bonus on a successful deal close. This ties incentives most tightly to the client's actual result. It also needs a measurable and attributable outcome, plus a level of trust in the measurement that most engagements haven't yet earned. So you'll see it more often with a repeat client than with a first-time one.
How do you choose a pricing structure?
None of these is "the right one" in the abstract. The right choice puts the estimation risk on the party better placed to manage it, given how well defined the scope actually is. Practice P13 gives you a concrete case to reason through.