Service Level Agreement (SLA)

A service level agreement (SLA) is the contractual mechanism through which a contracting authority defines, measures, and enforces the performance it requires from a service supplier. Rather than specifying how the supplier should work, an SLA specifies what outcomes the supplier must achieve, in measurable terms, and what happens when those outcomes are not delivered.

What is a Service Level Agreement (SLA)?

In European public procurement, SLAs appear across a wide range of service contracts: IT support and managed services, facilities management, transport, social care, and utilities maintenance. They are an essential component of output-based contracts and performance-based contracts, where payment or contract continuation depends on demonstrated service quality.

A well-structured SLA typically includes:

• Service metrics. Quantified standards for each aspect of the service (e.g., 99.5% system availability, 4-hour response to priority-1 incidents, 95% of repairs completed within 5 working days).
• Measurement methodology. How each metric is measured, by whom, with what frequency, and using what data source.
• Reporting obligations. Frequency and format of performance reports the supplier must provide, with audit rights for the authority.
• Remedy regime. Financial deductions, service credits, or other remedies triggered when performance falls below agreed thresholds.
• Review and improvement process. Mechanism for reviewing SLA targets over time, particularly in long-term contracts where technology or demand patterns change.

SLAs in PFI and public-private partnership contracts are particularly complex because the payment stream (the unitary charge or availability payment) is directly linked to the SLA performance. Sustained underperformance can reduce the supplier's revenue significantly, creating strong financial incentives for service delivery.

In UK public contracts, SLA frameworks are frequently built around PRINCE2 or ISO standards for IT services, and around government guidance such as the Cabinet Office Facilities Management toolkit for public buildings. In EU member states, equivalent national standards or sector-specific frameworks apply.

Why it matters for bidders

The SLA defines your delivery obligations in precise, measurable terms. Before signing a public service contract, you must be confident that the SLA targets are achievable with the resource levels and processes you are proposing in your bid. Agreeing to an SLA that you cannot consistently meet will result in financial deductions, potential contract termination, and reputational damage.

During bidding, critically analyse the measurement methodology and the deduction regime. Some SLAs are drafted in ways that systematically disadvantage the supplier through ambiguous measurement rules or disproportionate deduction values.

Example

A Dutch government ministry awards a 5-year managed desktop services contract. The SLA requires 99.5% desktop availability during working hours, resolution of priority-1 incidents within 2 hours, and monthly performance reporting. For each 0.1% shortfall in availability below the 99.5% target, a service credit of EUR 5,000 is applied to the monthly invoice. Three consecutive months of non-compliance trigger a performance improvement plan, and failure of that plan gives the ministry termination rights.

Frequently Asked Questions

Can SLA targets be renegotiated during a contract?

Yes, in most service contracts SLA targets are reviewed periodically (typically annually). Where technology improvements or changed demand patterns make original targets either too easy or unachievable, both parties can agree revised targets. Any renegotiation should be documented as a formal contract variation.

What is the difference between a service credit and a penalty?

In European public contracting, service credits are price adjustments that reflect the reduced value of the service received when targets are missed; they are not penalties for breach. This distinction matters legally: penalties require the authority to prove loss, while service credits are agreed price adjustments. Most well-drafted SLAs use service credits rather than penalties.

How do SLAs interact with force majeure events?

Standard SLA drafting excludes performance against metrics during events outside the supplier's reasonable control (force majeure, acts of the authority, or third-party infrastructure failures). If an external event prevents target achievement, the supplier should invoke the relevant exclusion promptly and in writing.