The customers that lose you money rarely look like it.
Cost-to-serve is the full cost of serving a customer once picking, packing, shipping, support and admin are counted, not just the cost of the goods. It is where a healthy P&L quietly hides loss-making relationships.
20-40%
of customers, in the models we build, contribute negatively once true cost-to-serve is attributed.
Same price
two customers, same product, can sit on opposite sides of break-even after cost-to-serve.
12-15 min
the Profit Check tells you whether you have a cost-to-serve problem worth modelling.
Your accounts tell you the company made money. They don't tell you which work made it.
Most operationally complex businesses run on a P&L that aggregates everything above the gross-margin line, then aggregates everything below it. It tells you whether last quarter was good. It doesn't tell you which customers were quietly subsidising others, or which orders cost more to fulfil than they earned.
A cost-to-serve model attributes operational cost down to the individual customer and order. The result is a ranked, defensible view of who actually contributes.
Whale curve. A few customers carry the profit; the tail erodes it. The peak is the profit you would have without the loss-makers.
Cost lands where it was actually consumed.
Map the operating model
Revenue streams, activities, cost pools, products and customers, in one structured view. Days of work, not months.
Time and cost each activity
TDABC attaches a real cost to picking, packing, delivery, support and admin, based on the time each actually takes.
Attribute cost to who consumed it
Every order's true cost-to-serve, rolled up to the customer, the product, the channel and the region.
Hand you a model you own
Your finance team updates it. Cost-to-serve becomes a lens you apply continuously, not a report that ages on a shelf.
One distributor, 830 of 1,951 customers contributing negatively.
A New Zealand distributor found that 830 of 1,951 customers were contributing negatively once cost-to-serve was attributed, a combined 1.335M euros. Two years of deliberate decisions later, that loss-making contribution is roughly halved.
Questions a Finance Director asks.
What is cost-to-serve?
How is cost-to-serve calculated?
Why does cost-to-serve matter for pricing?
See also how to calculate cost to serve step by step, our pricing work and the margin cascade.
Sources
Canonical works behind this method. Each opens in a new tab.
- PaperThe Cost-to-Serve MethodBraithwaite, A. & Samakh, E. (1998). International Journal of Logistics Management 9(1).Seminal paper that formalized the cost-to-serve method.
- PaperManage Customers for Profits (Not Just Sales)Shapiro, B. P., Rangan, V. K., Moriarty, R. T. & Ross, E. B. (1987). Harvard Business Review 65(5).Early evidence that many high-revenue customers are unprofitable to serve.
- PaperTime-Driven Activity-Based CostingKaplan, R. S. & Anderson, S. R. (2004). Harvard Business Review 82(11).The founding article defining TDABC and its two-parameter model.
- PaperMeasure Costs Right: Make the Right DecisionsCooper, R. & Kaplan, R. S. (1988). Harvard Business Review 66(5).Seminal argument that averaged overhead distorts true product and customer cost.
- PaperCost-to-serve measurement and customer profitability analysisGuerreiro, R., Bio, S. R. & Merschmann, E. V. V. (2008). International Journal of Logistics Management 19(3).Peer-reviewed case linking cost-to-serve measurement to customer profitability.
Find out what is hiding in your customer book.
Take the free Profit Check, 12 to 15 minutes, or talk to a senior partner. Thirty minutes. Free. NDA on request.
