Where this applies
For preliminary sourcing comparisons of ordinary goods. Customs classifications, duties, product compliance and contractual obligations need shipment-specific verification.
Gather first
- A common product specification and acceptance criteria
- Quotes with currency, quantities, lead times and named delivery terms
- Actual receipts, rejects, expediting costs and payment dates
A repeatable method
Make the requirement testable
Write down the revision, packaging, minimum order, delivery point and required arrival date. Ask each supplier to quote the same requirement and list exclusions. A quote for an unapproved substitute is not a like-for-like alternative.
Separate recurring and one-time costs
Put tooling, qualification and transition work in a separate row. Allocate them over an explicit volume and period rather than quietly hiding them in the unit price. Show what happens if that volume does not arrive.
Test delivery and quality evidence
Use receipts and acceptance records rather than a promised lead time alone. Ask how the supplier identifies affected lots and handles rejected units. Put unverified capabilities in an open-questions column.
Choose a reversible first step
Use a sample or bounded pilot where appropriate before committing the full requirement. Assign an owner to every unresolved specification and compare the result against the original acceptance criteria.
A cheaper quote can have a higher delivered cost
Assumptions: Illustrative USD amounts for 1,000 accepted units. Freight and quality allowances are assumed, not market quotes. Duties, taxes, financing and tooling are excluded; add them if applicable. Both suppliers can meet the same requirement.
- Supplier A: $10.00 per unit × 1,000 + $700 freight + $300 expected rework = $11,000.
- Supplier B: $10.40 per unit × 1,000 + $300 freight + $100 expected rework = $10,800.
- A: $11.00 per accepted unit. B: $10.80 per accepted unit. Difference: $200 for this assumed order.
What this means: The $400 purchase-price advantage at A is outweighed by $600 more freight and rework in this example. Rework is an estimate, not a guaranteed expense. If B needs more than $200 of extra qualification work for this order, the conclusion changes.
Common mistakes
- Do not compare a delivered quote with an origin-only quote without adding the missing leg.
- Do not multiply a historical defect percentage by order value unless that actually measures the expected economic loss.
Questions worth asking
Is lowest total cost always the best choice?
No. An option that fails a mandatory quality, capacity or delivery constraint is not feasible even if its modeled cost is lower.
When should I revisit the comparison?
Reopen it when specifications, volume, currency, delivery terms or lead-time performance change. Keep the prior assumptions so the reason for the change is visible.
Sources, dates and limits
The linked primary sources support the specific concepts described below. The examples and decision checklists are original illustrative analysis, not figures supplied or endorsed by these organizations. A check date is not a claim that a rule, price or contract will remain unchanged.
- NIST: 8 Ways to Improve Your Supplier Selection Process
Published 2023-05-30 · Checked 2026-11-05
Supplier capability, quality and total-cost considerations. Does not validate any supplier or the illustrative cost model.
Use the current source, your actual shipment documents and qualified advice where needed. This guide does not book freight, settle a dispute or determine a legal obligation.