Cost to serve: calculation and a customer example
Two customers buy the same quantity at the same price. Small orders, extra handling and returns leave very different results. Follow the costs before changing the service.
Two customers each buy €10,000 of the same product in a month. Both get the same price. Sales sees two equally valuable accounts.
One customer orders once. The other sends twenty small orders, needs special packing and returns part of a delivery. The warehouse knows these accounts take different amounts of work.
Cost to serve (CTS) measures the cost of the activities needed to supply a customer, product or channel over a defined period. Coupa's explanation connects that view to customer and product profitability. The calculation needs a clear boundary: which costs are already in product cost, and which remain to be assigned?
Cost to serve vs landed cost
Total landed cost gets a purchased item to an agreed location and condition. This example starts with that item already available for sale, then follows the work required to serve each customer.
| Cost view | Question it answers here |
|---|---|
| Landed product cost | What did the stock cost us to obtain? |
| Cost to serve | What work and spending did this customer's service require? |
| Customer result after these costs | What remains of revenue after both? |
Some businesses include product cost inside their cost-to-serve model. Either structure can work. Count it once and keep the same boundary when comparing customers.
Calculate the activities behind each account
Our fictional distributor supplies 1,000 units to each customer this month. Revenue is €10,000 per customer. The landed cost is €7,000 per customer. Both quantities are retained sales after any returns and credits.
The following activity rates are assumptions for the example. Order handling includes picking and standard packing; special packing is extra work outside that rate.
| Activity | Assumed rate | Customer A | Customer B |
|---|---|---|---|
| Order handling | €12 per order | 1 × €12 = €12 | 20 × €12 = €240 |
| Outbound delivery | €35 per dispatch | 1 × €35 = €35 | 20 × €35 = €700 |
| Additional packing | €2 per specially packed unit | €0 | 100 × €2 = €200 |
| Return handling | €30 per return case | €0 | 2 × €30 = €60 |
| Cost to serve within this boundary | €47 | €1,200 |
Customer A leaves €10,000 − €7,000 − €47 = €2,953. Customer B leaves €1,800. Neither figure is company net profit: sales overhead, financing and other excluded costs still exist.
The €1,153 difference comes from the agreed service activities. It does not come from a different product margin.
Same 1,000 units / same €10,000 revenue
What does changing order frequency change?
One dispatch per order. Special packing and return handling stay at €260. Customer A stays at one order and €47 service cost.
| Item | A: 1 order | B: 20 orders |
|---|---|---|
| Revenue | €10,000 | €10,000 |
| Landed product cost | €7,000 | €7,000 |
| Handling at €12/order | €12 | €240 |
| Delivery at €35/dispatch | €35 | €700 |
| Special packing and returns | €0 | €260 |
| Listed service cost | €47 | €1,200 |
| Result after these costs | €2,953 | €1,800 |
Assigned cost is not automatically money saved
Suppose B agrees to four consolidated orders instead of twenty, without changing the quantity or service requirements. Handling and dispatch cost becomes 4 × (€12 + €35) = €188. Add the unchanged €260, and the model gives €448.
The assigned cost falls by €752. Whether spending falls by €752 depends on the rates.
An external carrier charge might disappear when a dispatch disappears. Warehouse wages may stay the same, leaving capacity for other work. An average allocation of rent will not vanish because one customer orders less often.
Keep those differences visible before claiming a saving. The procurement savings example makes the same distinction between a reported saving and the company result.
Change the arrangement before judging the customer
Frequent deliveries may be something the company promised or encouraged. A customer following the offer has not caused a problem by being difficult.
Check whether consolidation would leave the customer short of stock, move cost into its operation or reduce sales. Compare an agreed delivery calendar, a minimum order quantity, a separate service charge or a change to the handling method.
Then test the arrangement on actual orders. Retain the activity records and compare service, retained sales, cost and capacity. A profitable service change needs the customer to receive what was agreed, as well as a better number in the cost model.
Source and example notes
- Coupa: Cost to serve. Customer and product cost analysis; model boundaries and allocations vary.
Customers, rates, quantities and results are fictional. Product costs exclude the service activities listed here. The model excludes return credits and stock-value changes because net sales and product cost are already stated after those effects.