Writing an SLA that actually holds up
A good SLA is specific, measurable, and something you can hit consistently. Here's what a service level agreement is, which template to start from, what every SLA should cover, how to set targets you won't regret, and how the SLA differs from the SLOs and OLAs behind it.
What is a service level agreement?
A service level agreement (SLA) is a written commitment to a standard of service: how fast you will respond, how fast you will resolve, when you are available, and what happens when you miss. SLA and “service level agreement” are the same document — the abbreviation is just what everyone says out loud.
What separates an SLA from a general promise of good service is that every term in it is measurable. “We respond quickly” is a sentiment. “First response within four business hours for P2 issues, measured from ticket creation, excluding time waiting on the customer” is an SLA. If a clause cannot be checked against a number at the end of the month, it does not belong in the document.
SLA templates by type
The seven sections are the same everywhere; what changes is who the two parties are and which metrics matter. Pick the closest starting point in the generator above — each one comes filled in with targets appropriate to that relationship.
- Customer Support Service Level Agreement
- A support SLA between your team and your customers. Use it as a customer service or help desk SLA template, where the counterparty is the customer who bought your product.
- IT Helpdesk Service Level Agreement
- An internal SLA between IT and the rest of the business. Use it as an IT, IT support, internal, or ITIL SLA template, where both parties work at the same company and the agreement is between departments.
- Managed Services Service Level Agreement
- A vendor SLA between a service provider and its client. Use it as an MSP or managed services SLA template — the version a provider signs with a client, where missed targets usually carry service credits.
- Uptime Service Level Agreement
- An availability SLA committing to a uptime percentage. Use it as a SaaS, website, or hosting SLA template, where the commitment is an availability percentage rather than a reply time.
What an SLA should cover
Whether it's for customers, an internal helpdesk, or a vendor contract, a complete SLA has the same seven parts. The generator above assembles all of them and injects your targets into the response and resolution table.
- 01Purpose & scopeWho and what it applies to
- 02DefinitionsResponse, resolution, priority
- 03Service hoursWhen and where you're reachable
- 04Response & resolution targetsBy priority
- 05EscalationWhat happens when a target slips
- 06ExclusionsWhat isn't covered
- 07Reporting & reviewHow performance is tracked
Setting realistic response & resolution targets
The most common SLA mistake is committing to numbers you can't hit. Separate first response (how fast someone replies) from resolution (how fast it's fixed), and set resolution targets by priority — critical issues in hours, normal requests in days. Look at your last quarter of actual response times before you commit: an SLA you beat 95% of the time builds trust, while one you miss erodes it faster than having none at all. Build in headroom by keeping your internal targets stricter than the SLA you publish.
Is an SLA a contract?
Usually it is part of one rather than a contract on its own. In most B2B arrangements the SLA is an annex or schedule attached to a master services agreement: the MSA carries the commercial terms and the legal boilerplate, and the SLA contract template supplies the service commitments. That is why the templates here open with a purpose and scope clause that references the underlying agreement instead of repeating it.
Two clauses decide whether it has teeth. The first is remedies: what the customer actually gets when you miss — typically service credits calculated as a percentage of the monthly fee, and for sustained failure, a right to terminate. The second is exclusions, which carve out the things genuinely outside your control: scheduled maintenance, third-party outages, misuse, and time spent waiting on the customer. An SLA with targets but no remedies is a statement of intent; one with remedies but no exclusions is a liability. Internal SLAs between departments normally skip remedies entirely — there is no money to move — and rely on reporting instead. Have a lawyer review anything customer-facing before you sign it.
SLA vs SLO vs OLA
An SLA is the external promise to your customer. An SLO (service level objective) is the stricter internal target you set to stay inside that promise, measured against an SLI — the actual metric. An OLA (operational level agreement) is the internal agreement between teams that makes the SLA possible — for example, IT committing to engineering that they'll provision access within an hour. The SLA is what the customer sees; the SLO and OLA are how you keep it. To keep any of them, you need to track every request against its target and let an AI agent handle the instant first response — which is what makes an ambitious SLA realistic.
