Service Contract Models: Per-Call, Per-Year and Uptime-Based
Service arrangements are usually chosen on price and reviewed after the first failure, which is the most expensive way to learn what an arrangement covers. The structures differ not in what they cost but…
Service arrangements are usually chosen on price and reviewed after the first failure, which is the most expensive way to learn what an arrangement covers. The structures differ not in what they cost but in what they transfer: a per-call arrangement transfers nothing until it is used, a per-year arrangement transfers execution risk across a period, and an uptime arrangement transfers part of the consequence of the equipment being unavailable. Choosing between them means deciding which of those transfers the department actually needs. This article sets out what each structure optimises for, which cost lines decide it, and how to compare them without comparing a subscription with an invoice.
What the Model Optimises For
A per-call arrangement optimises for low cost when the equipment is reliable, and it places the risk of an expensive or frequent failure on the user. It suits equipment that is stable, well understood, and supported by an in-house team or a supplier who can attend quickly when required. Its weakness is that it offers no certainty about response, and the cost of a failure event is unbounded in the sense that a bad year simply costs more.
A per-year arrangement optimises for predictable cost and defined cover. It transfers execution risk to the provider for a defined scope, and the value depends almost entirely on how that scope is drawn. An uptime-based arrangement extends the transfer to include part of the consequence of downtime, which is why it costs more and why it is worth considering where the equipment\’s availability has a clinical or commercial value that exceeds its repair cost. The extractable summary is this: per-call transfers nothing until it is used, per-year transfers execution risk within a defined scope, and uptime-based arrangements transfer part of the consequence of the equipment being unavailable.
There is a fourth model that is frequently the right answer and frequently overlooked. An organisation with real technical capability can service equipment in-house and buy only what it cannot provide itself, which in practice usually means parts and occasional specialist support. That model optimises for cost and for control of the record, and it depends on having people who can do the work, documentation that supports them, and enough equipment to justify the capability. Where those conditions hold, in-house service is frequently the cheapest and most responsive option, and a contract that duplicates it is a cost without a benefit.
The mistake that links all four models is treating them as competing prices rather than competing risk positions. A department comparing a per-call rate with an annual premium is comparing a cost when something happens with a cost whether or not it happens, and the answer depends entirely on what the department needs the arrangement to do. Deciding that first makes the comparison straightforward; leaving it until afterwards makes the comparison arbitrary.
| Structure | What the user pays for | What the provider carries | Suits |
|---|---|---|---|
| Per call | Work performed | Nothing beyond that visit | Reliable, well-understood equipment |
| Per year, defined scope | Cover across a period | Execution within the scope | Predictable budgets and managed fleets |
| Uptime based | Availability performance | Part of the consequence of downtime | Equipment whose availability has clinical value |
| In-house with parts support | Own labour plus parts | Own execution | Organisations with real capability and volume |
The Cost Lines That Decide It
The comparison that matters is not between a contract price and an average repair cost; it is between total costs under realistic failure scenarios and the value of the risk transferred. The lines below are the ones that determine the real difference.
| Cost line | Why it decides the outcome |
|---|---|
| Contract or call-out charge | The visible element of the comparison |
| Parts and consumables included or excluded | Frequently the largest cost difference in practice |
| Response and attendance terms | Determines the value of the cover rather than its price |
| Downtime during repair | The cost the uptime structure attempts to address |
| Exclusions and what constitutes misuse | Determines how much of the cover is usable |
| Travel and on-site requirements | Adds cost to any arrangement, structured differently |
| Escalation and renewal provisions | Determines how the cost behaves beyond the first year |
How the Numbers Behave Over the Equipment Life
Service cost is not flat across a device\’s life. A well-maintained device can run at low cost for years and then rise sharply when several components approach the end of their service life together. That pattern affects the three structures differently: a per-call arrangement absorbs the rise directly, a per-year arrangement absorbs it until renewal and then reprices, and an uptime arrangement prices the exposure from the beginning.
The practical consequence is that a comparison made during a low-failure period favours per-call, and a comparison made after a bad year favours contractual cover, even when the underlying equipment is identical. The honest approach is to compare structures against a realistic failure profile rather than the recent one, including at least one scenario in which a significant component fails. Where the equipment\’s parts position is uncertain, the comparison should treat the resulting delay as a cost under every structure, because a provider who cannot obtain a part cannot restore availability regardless of what the contract says.
A second behaviour concerns the age of the equipment rather than the pattern of failures. Older equipment often has a higher failure rate and a longer repair time, because parts take longer to obtain and repairs are more involved. That combination makes availability-based arrangements more attractive as equipment ages, which is the opposite of the common assumption that older equipment should be left uncovered. Where the department intends to keep a device in service for several more years, the service structure should be reconsidered at that point rather than left as it was when the device was new.
Where the Model Transfers Risk and to Whom
The transfer is the substance of the decision, and each structure moves a different set of risks.
| Risk | Per call | Per year | Uptime based |
|---|---|---|---|
| Cost of an unexpected failure | User | Provider, within scope | Provider, within scope |
| Frequency of failures | User | Shared through renewal pricing | Provider, through the availability measure |
| Parts availability | User | Depends on scope | Provider, to the extent the measure applies |
| Response time | Not transferred | Defined | Defined and measured |
| Consequence of downtime | User | User | Shared, through credits or remedies |
| Competence and records | User or provider by arrangement | Provider | Provider |
Sensitivity to Volume and Utilisation
Utilisation affects service economics through failure rate and through the value of availability. Equipment used intensively fails more often, which raises the cost of per-call arrangements and makes contractual cover more attractive. The same equipment used occasionally may run for years without a failure, which makes per-call cheaper in cash terms while leaving the department exposed to a single large event.
Availability value moves in the opposite direction and is frequently the more important variable. A device whose unavailability stops a service justifies stronger cover than one whose failure can be absorbed by rescheduling, and the difference is a clinical judgement rather than a financial one. The useful output of this assessment is a statement of how much the department would pay to avoid a week without the device, because that figure determines whether an uptime arrangement is expensive or reasonable.
Exit and Early-Termination Positions
The exit position determines how much of the arrangement is optional. Per-call arrangements have no exit cost because they are not commitments. Per-year arrangements generally have notice periods and may carry charges for early termination, and the terms should be read rather than assumed. Uptime arrangements frequently run for a term, because the provider is accepting an exposure that has to be priced over time.
The element most often overlooked is what happens to records and access at the end of an arrangement. Where a provider has maintained the equipment, the service history and the configuration knowledge sit with the provider, and the department\’s ability to change provider depends on whether those records transfer. Confirming the record position at the start of an arrangement is easier than negotiating it at the end, and it is the difference between a genuine choice at renewal and a decision that cannot practically be made.
A second exit consideration is the equipment\’s position at the end of its supported life. Where a provider has been maintaining a device through its last supported years, that provider is often the party with the clearest view of whether the device can continue. Obtaining that assessment before the arrangement ends, rather than after, is what allows the department to plan a replacement instead of discovering that support has already ended.
How to Compare Two Models Fairly
A fair comparison holds the equipment, the scope and the failure assumptions constant, and compares total cost and risk transfer over the same period.
| Comparison input | Why it has to be identical |
|---|---|
| Equipment and configuration | Determines the failure profile and the parts position |
| Scope of cover, including parts and consumables | Determines what is actually being compared |
| Response and attendance terms | Determines the value rather than the cost of cover |
| Failure assumptions, including a significant failure | Prevents the comparison reflecting a quiet period |
| Availability value to the department | Determines whether uptime cover is worth its price |
| Record and access position at the end | Determines whether the decision can be reversed |
Two further inputs are worth adding. The first is the organisation\’s own capability, because in-house service changes the comparison from the outset rather than being an alternative to it. The second is the traceability of any measurements the arrangement relies on, since a service conclusion based on instrument readings needs those readings to be supported; the ILAC accreditation directory allows a provider\’s calibration status to be checked. Where the arrangement covers equipment subject to device-side expectations, those expectations continue throughout and are illustrated in one market by the MHRA guidance on regulating medical devices.
Buyers who want the wider context can start from the knowledge hub, compare how equipment and its condition are described on the marketplace store, or use the service material in the industry hub. Our analysis of service contracts versus in-house biomedical support for used devices covers the in-house option that sits alongside these structures. The professional framework for servicing is covered by AAMI\’s medical device servicing material, independent guidance from organisations such as ECRI is a useful reference on equipment reliability, and the duty to keep equipment safe and available is framed in national workplace material such as the HSE health services guidance, with cross-market expectations summarised by the WHO medical devices programme.
Reviewing your service arrangements or comparing structures for a new platform? Send the equipment details, the failure history and the terms you have been offered and we will set out what each structure transfers.
FAQ
What are the main types of medical equipment service contract?
The common structures are per-call arrangements, where the user pays for work performed; per-year arrangements with a defined scope, where execution risk transfers for a period; and uptime or availability-based arrangements, where the provider accepts part of the consequence of downtime. In-house service with parts support is a fourth option that sits alongside them. Each transfers a different set of risks rather than simply costing a different amount.
Is a service contract worth it for used equipment?
It depends on the equipment\’s failure profile, the parts position and the value the department places on availability. Used equipment with an uncertain parts position can benefit from contractual cover that transfers the responsibility for sourcing, provided the scope actually includes parts. Equipment that is reliable and well understood may cost less on a per-call basis, with the exposure accepted knowingly rather than overlooked.
What should a service contract cover?
At minimum it should define the scope, the response and attendance terms, whether parts and consumables are included, what is excluded and what constitutes misuse. The most common disappointment is a contract that covers labour while excluding the parts that represent the largest cost of a significant repair. Confirming the parts position in writing before signing is the single most useful step in evaluating an arrangement.
How is uptime measured in an availability-based contract?
The measure and its exclusions are defined by the agreement, and the definition matters more than the headline percentage. What counts as unavailable, who records it, how scheduled maintenance is treated and what remedies apply are all part of the measure, and a definition that excludes the situations the department actually experiences provides little protection. Reading the definition before comparing prices is what makes the comparison meaningful.
What happens to service records when a contract ends?
The position depends on the agreement, and where a provider has maintained the equipment the records and configuration knowledge may sit with them. The department\’s ability to change provider or to sell the equipment depends on obtaining those records, so the access position should be established at the start of the arrangement. A service history held elsewhere is difficult to use at resale or during an audit.
Part of the Medical Equipment Maintenance & Service guide.
