The Chief Information Security Officer role exists because at a certain scale, security becomes too complex and too consequential to manage without dedicated executive leadership. A large bank needs a CISO. A healthcare network with hundreds of thousands of patient records needs a CISO.
Most SMEs do not.
That is not a controversial position among security professionals, though it tends to surprise business owners who have been told they need to "take security seriously." Taking security seriously does not require a six-figure salary sitting at your leadership table. What it requires is the right level of security thinking applied at the right time.
What a CISO actually does
Understanding the role helps clarify whether you need it. A CISO sets security strategy. They own the risk register, manage relationships with regulators and auditors, chair security governance committees, report to the board, and build and lead a security team.
That is a full-time job in an organisation complex enough to warrant it. An enterprise running dozens of systems, operating in multiple jurisdictions, handling sensitive data at scale, and facing active regulatory scrutiny genuinely needs all of those things happening continuously.
For an SME, most of those functions either do not apply or do not need to happen full-time. The risk register does not change every week. Regulatory requirements are knowable and stable. Board reporting on security can happen quarterly rather than requiring a standing executive.
What you probably need instead
The function you need is security judgment. Someone who can look at your environment and tell you what your actual risks are, what the priority order for addressing them is, and how to think about security decisions as they come up in the normal course of running the business.
That is a different thing from a full-time CISO. It is a fractional engagement. A few hours a month, available when you need a second opinion on a technology decision or when something happens that requires a clear-headed security perspective.
Fractional security leadership has become significantly more common in the last few years, driven partly by the talent shortage and partly by SMEs waking up to the fact that they need security expertise without having the budget or the ongoing workload to justify a full-time hire.
When the calculus changes
There are situations where the fractional model is not enough. If you are subject to a compliance regime that requires a named CISO. If you are growing quickly and security decisions are coming up multiple times a week. If you have had a significant incident and need dedicated focus to rebuild your posture. If you are in a sector where security is a competitive differentiator and you want someone building programs rather than advising on an occasional basis.
These are real scenarios. For the businesses that fit them, the full-time hire makes sense and the investment pays off. But they are not the norm for SMEs.
The honest question to ask
Before you start a recruitment process or sign a contract, ask yourself how many security decisions your business actually faces in a given month. How often does something come up that needs executive-level security judgment rather than operational IT work?
If the answer is a handful of times a month, you probably need a fractional model. If the answer is constantly, you might need to think about a full-time hire.
The worst outcome is paying for a full-time CISO in an environment that cannot keep them busy. The second worst outcome is not having any security leadership at all because the full-time model felt unaffordable.
There is a practical middle ground. Most SMEs are just not aware it exists.