Compare the Full Cost of Each Supplier.
Build a supplier total-cost comparison around delivered cost, order size, quality, inventory and switching. Keep assumptions visible and avoid double counting.
Compare suppliers over the period in which your business will use the supply. Include the goods, delivery and the additional work or commitments each option requires. Keep one-off transition costs separate from repeat-order costs.
This is useful when the quoted price points one way but MOQ, inventory, quality or switching requirements point another. The aim is to expose the variables that can change the decision, using costs your business can support.
Set the Comparison Boundary
Agree the product, expected demand, period and receiving point. Use the same assumptions for each supplier unless a quoted condition requires a difference. Record that difference explicitly.
Landed cost covers getting the goods to the agreed point. Total cost of ownership extends the comparison to holding and using the supply, managing the relationship and making a transition where relevant.
Separate the Cost Groups
| Cost group | Items to examine | Treatment in the comparison |
|---|---|---|
| Goods and delivery | Price, packing, transport and applicable receiving costs | Use a common delivery boundary |
| Order commitments | MOQ, order pattern and payment dates | Show the stock and cash required |
| Holding and use | Storage, handling and any supported inventory or usage costs | Use business-specific inputs |
| Quality | Inspection, documented rework or other supported quality costs | Distinguish observed cost from a scenario |
| Changeover | Samples, testing, tooling, setup and qualification work | Identify one-off costs separately |
| Supplier management | Extra administration or monitoring required by the option | Include only costs material to the decision |
Avoid counting the same item twice. For example, transport already included in the delivered price should not appear again as an additional cost.
Look at the Amount You Must Buy
Show expected demand beside the supplier’s minimum order quantity. Then show the amount ordered, paid for and left in stock under each option. A lower price on a larger order can create a different commitment even before other costs are considered.
Use your own expected usage and inventory assumptions. Do not turn uncertain future demand into a confirmed benefit of ordering more.
Treat Quality and Timing with Care
If you have documented supplier performance, use it with its period and scope visible. If the candidate has no comparable performance record, identify the missing evidence. Avoid assigning a defect cost or delivery reliability score because the spreadsheet needs a number.
You can test a scenario without presenting it as a forecast. State the question, such as whether an extra inspection step or a delayed delivery would change the preferred option. Leave unsupported financial amounts unresolved until the responsible team supplies them.
Make the Switching Cost Visible
List the work needed before the alternative becomes usable: technical review, samples, tests, new tooling, document checks and any parallel supply period. Identify who performs it and what has been quoted or estimated.
A one-off cost may be acceptable over a longer supply period and unattractive for a short requirement. Use the planning period the business is actually considering; do not stretch it to make a preferred supplier look cheaper.
Test the Decision Rather Than the Spreadsheet
Ask:
- Which cost difference has the strongest evidence?
- Which assumption could reverse the recommendation?
- Can negotiation on MOQ, payment or delivery solve the problem?
- Is a trial needed before relying on the candidate’s operating performance?
- Would retaining the incumbent meet the requirement with less transition work?
The next action may be a revised offer or further qualification rather than an immediate switch. A useful total-cost review makes that action clear.
Merillgrove can help review the supplier terms and operating assumptions behind a proposed change. Bring the current offer, the alternative and the demand both must support.