A cost breakdown was rejected by the buyer because the material line was higher than a competitor’s. The competitor’s breakdown, produced three months later, showed the same materials and a yield figure that had been omitted. The rejection had been based on a comparison between a complete calculation and an incomplete one.
Charger cost breakdown: five beliefs, examined
Materials dominate, volume always lowers the cost, labour is minor, tooling is a one-off, and two breakdowns are comparable.
Each belief contains something true, which is why it survives a review. The cost of acting on the untrue part is a decision taken on a number that does not describe the same thing as the number beside it.
The five are examined below in the order they usually appear in a quotation review, with the correction that makes the comparison meaningful.
Belief 1: materials dominate the cost
Materials are the largest line and not the largest lever.
On a platform build the material line is typically the biggest share, and it moves only when the specification, the approved component list or the supply market changes. The lines that respond to a decision are the packaging setup, the test content and the platform choice, which is why negotiating on materials tends to produce a substitution rather than a saving. A breakdown that shows the material share without the yield figure is incomplete: the two together give the cost per shipped unit.
Belief 2: volume always lowers the cost
Volume changes the fixed charges and the thresholds, not the material price per piece.
Doubling the order halves the per-unit effect of tooling, packaging setup and certification, and it may cross a reel or moulding threshold. It does not change the component price unless the supplier’s own purchase quantity crosses a threshold as well. The practical consequence is that the biggest gains from volume happen at the start, and the curve flattens once the fixed charges are covered.
Belief 3: labour is a minor line
Station time is small per unit and large per decision.
Assembly, test and packing together may be a modest percentage of the cost, and they are the lines that respond to the test plan and to the port configuration. Adding a port adds material and test positions; extending aging adds rack time and therefore cost; and reducing either without a process change moves the cost into returns. The line looks minor in the breakdown and decides the quality outcome.
Belief 4: tooling is a one-off charge
Tooling is one-off, and it is not a single charge.
The mould is one item; the fixtures and gauges are others; the trial loops are a third; and the packaging plates are a fourth, charged per artwork version. A breakdown that shows one tooling figure is describing the visible item, and the remaining three appear later. Comparing total programme cost rather than unit price is what puts them in the right place.
Belief 5: two breakdowns are comparable
They are comparable only when they share the same assumptions.
Material prices assume a purchase quantity; labour assumes a line rate and a test plan; overhead assumes a schedule; the yield figure assumes a process. None of the five beliefs above can be resolved without those four assumptions, which is why a comparison should state them rather than compare totals. The useful output of a breakdown review is a list of assumptions, not a ranking.
| Belief | What is true | What is not | What it costs |
|---|---|---|---|
| Materials dominate | They are the largest line | They are not the largest lever | A substitution instead of a saving |
| Volume lowers cost | Fixed charges spread further | Materials do not fall by themselves | Waiting for a curve that flattens |
| Labour is minor | It is a small share per unit | It decides quality outcomes | A test plan trimmed for cost |
| Tooling is one-off | It is paid once | It is four separate groups | A second invoice after approval |
| Breakdowns are comparable | They have the same lines | They assume different inputs | A decision on unmatched numbers |
What to ask for instead
Four assumptions, and then the lines.
Which purchase quantity the material prices assume; what the line rate and test plan are; what first-pass yield the calculation uses; and which fixed charges are included. With those four stated, the lines become comparable and the differences explainable. Without them, a breakdown is a table of numbers that happen to add up.
How the beliefs show up after the order
Four symptoms, and each is familiar.
A second order priced higher because a threshold was lost; a tooling invoice that arrived after the mould; a packaging charge for additional languages; and a unit price that looked competitive until the yield-driven rework appeared as a schedule problem. Each of the four is a belief from the list above, applied to a real order.
FAQ
Should we ask a supplier for a full cost breakdown?
Ask for the five cost lines and the four assumptions behind them. A supplier’s internal model is its own business; the lines that describe what you are buying are not, and the assumptions are what make them comparable. Ask for the five cost lines and the four assumptions behind them, because the lines describe what you are buying and the assumptions make two quotations comparable.
Why does the material line differ between two suppliers for the same design?
Purchase quantity, supplier tier, the exact part numbers on the approved list, and the yield assumption. Where the part numbers differ, the two products are not the same design and the comparison is not like for like. Purchase quantity, supplier tier, the exact part numbers on the approved list and the yield assumption explain most of the gap, and where the part numbers differ the two products are not the same design.
Is a lower labour line a good sign?
It can be a sign of a simpler product or of a shorter test plan. The useful question is which test positions are included and what the first-pass yield is, because the two together describe what the saving costs. A lower labour line can mean a simpler product or a shorter test plan, so ask which test positions are included and what the first-pass yield is.
How should tooling appear in a comparison?
As four groups with their totals, divided by the volume the forecast supports. A single tooling figure hides the fixtures and the trials, which are the items that appear later. Show tooling as four groups with their totals divided by the volume the forecast supports, because a single figure hides the fixtures and the trials that appear later in the programme.
Next step
Send the configuration, the packaging versions and the forecast to Wecent Group through the contact page. The reply provides the cost lines with the four assumptions stated, the tooling groups separated and the total at the quantity you intend to order. Related reading: OEM and ODM charger manufacturing, wholesale charger programmes and the factory floor. External references: ICC Incoterms rules, International Trade Centre Trade Map, IEC standards, BSI ISO 9001 quality management, UL standards and certification and TUV testing services.
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