What SSO actually gives you
One identity, one login, central control. The security benefit that matters most is not convenience — it is that disabling one account removes access to everything at once.
In a business without SSO, offboarding means remembering every application someone had access to. That list is never complete.
When it starts being worth the cost
- Roughly twenty to thirty staff and rising
- Ten or more applications holding business data
- Meaningful staff turnover or contractor use
- Customers or insurers asking about access control
- Regulatory expectations in your sector
Below those thresholds the licensing and setup cost is difficult to justify against the alternative measures.
The cheaper measures that get you most of the way
- Multi-factor authentication everywhere. The single highest-return security control available, and mostly free.
- A business password manager with shared vaults, so credentials are not in a spreadsheet or a colleague's memory.
- A written offboarding checklist, automated if possible, listing every system.
- Quarterly access reviews — who has access to what, and should they still.
If you do only one thing this quarter, enforce multi-factor authentication on email and anything financial. It prevents the majority of credential-based compromises small businesses actually experience.
The SSO tax on software
Some vendors put SSO behind their highest tier, which can multiply your licence cost. This practice is increasingly criticised and still common.
Price it before committing to an SSO strategy: the total may be dominated by tier upgrades rather than by the identity provider itself.
If you do implement it
Roll out in stages, starting with the applications holding the most sensitive data. Keep an emergency access route for administrators — being locked out of your identity provider is a genuinely bad day.
And make sure offboarding actually uses it. SSO with a manual offboarding process that forgets to disable the central account has bought you very little.