Compare the currency of the obligation, not only today's converted display
A recurring service can fit a budget in one currency while creating an uncertain obligation in another. A converted number on a comparison sheet may help discussion, but it does not change what the supplier is entitled to bill or the costs of paying that bill.
This fictional procurement example compares two otherwise acceptable operating arrangements against a stated euro budget. Its prices, exchange scenarios and charges are invented. They are not market quotations, forecasts or recommendations for a real financial transaction.
State the constraint before comparing offers
The organisation has an approved monthly operating ceiling of €100 for a defined hosting service during the next six months. The owner is not trying to speculate on exchange rates. The requirement is to choose an arrangement whose known obligation can be planned within that ceiling.
Two imagined offers have passed the same separate technical and support checks for the stated workload:
| Offer | Billing obligation in this example | Other stipulated payment cost |
|---|---|---|
| A | €96 per month for the agreed six-month period | None beyond the included charges stated in the example |
| B | US$100 per month for the same period | A fixed €4 payment charge each month |
For this comparison, the approved €100 ceiling and the listed costs are on the same agreed basis. Any tax treatment outside that basis is left for the organisation's adviser. The example does not quietly assume that real offers have identical taxes, support or renewal conditions.
Find the misleading comparison
The first spreadsheet labels both offers “about €96” using a convenient current-looking conversion. It records neither the actual billing currency nor the €4 payment charge for B. A reader could mistake the displayed comparison for two fixed euro obligations.
The reviewer goes back to the imagined terms. A is billed in euros at the stated amount. B remains a dollar obligation; paying it from the euro budget depends on the applicable conversion and the stated charge. Renaming B's spreadsheet column does not remove that dependency.
The team therefore replaces the single converted estimate with an explicit scenario comparison. The rates below are stipulated examples, not observed or predicted rates:
| Scenario for B | Dollar conversion | Plus stated charge | Total euro outlay in the model |
|---|---|---|---|
| US$1 costs €0.90 | 100 × €0.90 = €90 | €4 | €94 |
| US$1 costs €1.05 | 100 × €1.05 = €105 | €4 | €109 |
The first scenario is below the ceiling; the second is above it. The calculation does not establish which scenario will occur. It establishes that the offer is not a fixed €96 obligation under the information supplied.
Make the bounded procurement decision
The owner chooses A for this six-month planning period because its stipulated €96 obligation fits the €100 ceiling without depending on the conversion scenarios. The decision is about predictability under a specific constraint, not a claim that A is universally cheaper or technically better.
The team records the unused €4 as budget headroom, not as a guaranteed saving compared with B. It also retains the end date of the agreed price period. A renewal, usage change or new charge would require a fresh decision rather than inherit approval from this comparison.
B is not declared unsuitable for every organisation. A business that receives dollars, has a different budget policy or accepts the variability could reach another decision. Those conditions are outside this example and should not be invented merely to make one offer win.
Check the rest of the obligation
Currency is one part of a meaningful comparison. A real proposal should identify the legal account owner, service included, usage limits, payment method, renewal arrangement and cancellation conditions. An attractive introductory amount may not describe the later obligation.
If an estimate uses an exchange reference, record its date, direction and purpose. A reference rate does not by itself establish the rate or fees applied to the actual payment. Obtain those details from the relevant supplier and payment arrangement, with appropriate advice where needed.
The technical review remains separate. Passing this budget comparison does not show that the service supports the application's workload, recovery requirement or data arrangements. In the fictional decision, those checks were explicit prerequisites rather than consequences of choosing a euro price.
Preserve the comparison in the handover
The final record contains the original billing currency and amount, the included-cost basis, the chosen period and the reason for the decision. The person renewing the service can then see what needs to be rechecked. A bare note saying “hosting: €96” would lose that context.
For a website or software proposal, apply the same discipline to provider subscriptions alongside the build fee. The scope page separates those responsibilities. The deeper comparison guide shows how a different requirement—maintained table order—can decide between technically plausible tools.