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Compare service vendors on the same scope, usage, service levels, contract period and terms, then evaluate the full expected cost—not just the quoted starting price. Include any contractually specified price changes, and weigh cost against measurable performance, delivery risk and the practical effort and expense of switching.
Start with the same requirements for every vendor
Write a shared baseline before comparing proposals. Specify the service you need, minimum service levels, service hours, response and resolution expectations, expected volumes, reporting, onboarding or transition needs, and the contract period. Ask each vendor to price that baseline.
Separate optional upgrades from the core offer. If one proposal includes extras another omits, price those separately or adjust the comparison so you are evaluating equivalent service. The U.S. Postal Service advises buyers to account for differences in proposal terms and conditions and to level offers for comparison in its Supplying Practices Process Step 2.
Compare total cost over the contract period
A low first-month or first-year price may not be the lowest-cost offer over the term. Use one time period and the same volume assumptions for all vendors. Record the components that can change the total:
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- Recurring charges and what they include
- One-time setup, onboarding or transition charges
- Usage-based fees and the assumed volume
- Optional services and their separate prices
- Contractually specified adjustments to prices during the term
Review line items as well as the total. In U.S. federal procurement, FAR 15.404-1 notes that a total price can appear acceptable while individual line items are significantly over- or under-priced, creating performance or pricing risk. That rule applies to federal procurement, but the underlying check is useful in other buying contexts too. See the Federal Acquisition Regulation, 15.404-1.
Work out how each price increase is calculated
Read the adjustment clause and put it into plain language. Identify when an increase can take effect, what index or formula is used, which charges it applies to, how often it can recur, and whether the contract specifies a cap, floor, notice period or renegotiation condition. Distinguish a stated contractual adjustment from a vendor’s request to change the price: the latter is not automatically authorized by the contract.
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If the clause links prices to an index, calculate scenarios using the contract’s formula and the relevant published data. Do not substitute a broad inflation rate for the specified measure. UK Cabinet Office sourcing guidance describes indexation as a way of allocating inflation risk and recommends official sources and published index data for index-linked payments. This guidance is for the UK public-sector context, not a universal legal rule. See the Cabinet Office guidance on contract price adjustments.
Judge whether the increase is a fair comparison
Compare a proposed increase with the existing price, other offers and relevant market evidence only after checking that the underlying service and terms are comparable. A previous price is not automatically a fair benchmark: scope, quantities, market conditions, competition, startup costs and included services may have changed. USPS guidance specifically identifies these factors when adjusting historical prices for comparison.
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Competitive proposals, prior prices and cost elements can all inform price analysis, according to FAR 15.404-1. Use more than one reference point where possible, and document what makes each comparison relevant. A vendor’s explanation may clarify an increase, but it does not by itself prove that the amount is reasonable.
Compare value, performance and delivery risk
Price is only one part of the decision. Compare evidence of service performance, commitments the vendor can control, exclusions, dependencies, supplier capacity, continuity arrangements and transition requirements. Where appropriate, use objective, measurable service outcomes in evaluation and contract management. UK sourcing guidance recommends performance measures tied to outcomes that the supplier can influence.
Also consider which party bears inflation and other delivery risks. A contract that places more risk on the vendor may appear to make buyer costs more predictable, but that risk can be reflected in the quoted price or affect the supplier’s incentives. A very low offer deserves scrutiny if it appears incomplete or the supplier may not understand or be able to perform the work. MCC procurement guidance treats unusually high and unusually low prices as issues for reasonableness analysis.
Use a comparison table to expose differences
| Comparison axis | What to record |
|---|---|
| Scope | Included work, exclusions, service hours, volumes and optional items |
| Total evaluated cost | Cost over the same term and usage assumptions, including setup, recurring, variable and adjustment charges |
| Price-change exposure | Trigger, formula or index, affected charges, frequency, limits and notice terms |
| Performance | Measurable service levels, supporting evidence, reporting and remedies |
| Delivery risk | Supplier capacity, dependencies, transition, continuity and allocation of contract risks |
| Comparability | Whether differences in terms, scope or historical baselines have been adjusted |
Set the relative importance of these factors according to your service needs and the contract. If proposals still differ substantially, identify the specific difference rather than treating the lowest headline price as the winner.
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Ask focused questions before renewing or switching
Ask the vendor to show how it calculated the increase, which contract provision it relies on, what supporting basis it used, and whether the change reflects a scope or service-level change. You can also request alternatives—for example, a longer price hold, a different adjustment basis or a revised service bundle. These are negotiation options, not guaranteed rights.
Before deciding to renew, negotiate or switch, check the existing contract and the rules that apply to your location and service type. The sources above cover distinct settings: UK public-sector sourcing, U.S. federal procurement, USPS supplier evaluation and other procurement guidance. They offer comparison principles but do not establish the rights or obligations of an unspecified private service contract. Contract wording and applicable local law determine what changes or exit options are available.
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