A few engagements carry the firm. Do you know which?
Ask a partner which engagements make money and you will get the famous ones, the big logos, the long retainers. Run the numbers properly and the list rarely matches. In professional services the profit is concentrated in a handful of engagements, while a long tail quietly loses money once realisation, scope creep and rework are charged where they belong.
Cost and Profitability Consulting · 150+ models since 2010 · TDABC
In professional services, engagement profitability follows a steep whale curve. A minority of engagements generate well over 100 percent of profit, while 20 to 30 percent run below total cost once realisation, scope creep, write-offs and bench are loaded. Standard reporting on billed revenue hides this. TDABC and customer profitability analysis rank every engagement and client on true margin, so the firm can fix, reprice or exit the losers.
Prestige and profitability are not the same thing.
The engagements a firm is proudest of are rarely the ones that pay best, because the things that make work prestigious, big scope, senior attention, a marquee client, are exactly the things that drive cost and discounting. Billed revenue cannot see any of it. The real margin only appears once realisation, scope creep and write-offs are charged to the engagement that caused them.
Realisation is the silent killer
The gap between standard rate and the rate actually billed and collected, after discounts, write-downs and unbilled hours, can quietly turn a profitable-looking engagement into a loss.
Scope creep compounds
Extra requests accepted to keep the client happy add cost that was never priced, and on a fixed fee they land entirely on the firm.
Write-offs land too late
By the time hours are written off at billing, the damage is done and the engagement is already underwater, but the lesson rarely reaches the next pitch.
Client-level beats engagement-level
A single engagement may look fine, yet the client behind it consumes so much account management and pre-sales across the relationship that the client, in total, loses money.
ENGAGEMENTS, RANKED BY TRUE MARGIN
Illustrative. A handful of clean engagements build well over 100 percent of profit; a long tail gives much of it back once realisation, scope creep and bench are loaded. Some flagships sit underwater.
Collected fees minus everything that was really spent.
True margin starts from fees billed and collected, not quoted, and subtracts the fully loaded cost: the billable hours at their real rate, the bench the team drew on, the pre-sales carried in, the scope-creep hours nobody priced, and the write-offs. What remains is the number the whale curve is built from.
Engagement margin = billed-and-collected fees - (billable hrs x cost rate) - bench allocation - pre-sales carried in - scope-creep hrs x cost rate - write-offs and write-downs
Illustrative. The scope-creep and write-off terms are what turn an optimistic fixed fee into a loss the headline revenue never showed.
The cleanest engagements, not the largest.
A mid-size consultancy plotted every engagement of the year on a whale curve and watched its assumptions collapse. The most profitable engagements were not the largest by revenue but the cleanest by realisation, with tight scope and few revisions. Several flagship engagements, prized internally, sat below the waterline once scope creep and partner time were loaded, dragged down by fixed fees that had been quoted on optimistic hour estimates. The firm did not walk away from the marquee work; it tightened change-control, started pricing scope changes, and used the curve to choose which kinds of engagement to chase, lifting blended margin without raising a single standard rate.
Frequently asked questions
- What does the whale curve look like in professional services?
- Steep. A small group of engagements and clients produces well over 100 percent of profit, while the long tail and a loss-making segment pull it back down. The cumulative profit line climbs, peaks, then falls.
- Why do flagship engagements often lose money?
- Because they attract scope creep, heavy partner attention and discounting, and are often priced on optimistic hour estimates. Prestige and profitability are not the same thing.
- What is realisation and why does it matter?
- Realisation is the share of standard-rate value actually billed and collected after discounts, write-downs and unbilled time. Low realisation can turn a healthy headline fee into a real loss.
- How do you measure engagement profitability properly?
- Take billed-and-collected fees and subtract fully loaded cost, including bench, pre-sales, scope-creep hours and write-offs, using time equations rather than a blended rate.
See which engagements actually carry the firm.
The Profit Check takes five minutes and no data upload. It points to where your engagement margin is most likely inverted, and what fixing, repricing or exiting the losers is worth.