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Fractional CISO vs Full-Time CISO: When Each Makes Sense

At some point a customer, a partner, or an auditor asks who owns security at your company, and "the CTO, between everything else" stops being a good enough answer. That is usually when founders start weighing a fractional CISO against a full-time hire. Having run security for a 15-person team and stood up a program from scratch, here is how I would think about the decision.

What each one actually is

A full-time CISO is a senior executive who owns security strategy and execution as their whole job, building and leading a security team, sitting in leadership, and being accountable for risk across the company.

A fractional CISO (also called a virtual CISO or vCISO) is that same seniority, brought in part-time, a few days a month, to own strategy and run the program without the full-time cost or headcount. Done well, it is not advice from the sidelines; the fractional CISO does the work and represents security in the rooms where it matters.

The cost gap

This is the part that decides it for most early-stage companies. A full-time CISO in Canada is a senior executive salary, commonly $180,000 to $300,000+ all-in once you include benefits and equity, before you have hired anyone for them to lead. A fractional CISO runs on a monthly retainer sized to your needs, often a fraction of that, scaling up around audits, launches, or incidents and back down when things are quiet.

When a fractional CISO is the right call

• Security work is starting to block deals or audits, but it does not yet fill a full-time role.
• You need to pass SOC 2 or ISO 27001 and handle customer security questionnaires, without pulling your CTO off the product.
• You are going through security due diligence and want it handled by someone credible.
• You want senior judgment on architecture and risk, but the day-to-day volume is a few days a month, not five.
• You are pre-Series B and every full-time hire has to be load-bearing.

When you have outgrown it

A fractional CISO is a stage, not a permanent state. The signals that it is time to hire full-time:

• You are building a security team that needs daily, in-house leadership.
• Security decisions are now continuous and deeply embedded in product, not periodic.
• Regulatory or contractual obligations require a named, full-time executive.
• The work has simply grown past what a part-time engagement can carry.

A good fractional CISO will tell you when you have hit this point, and can help you scope the role, write the job description, and interview candidates, because they have been doing the job.

The honest recommendation

If you are a startup under roughly 50 people and security is becoming a real question but not yet a full department, a fractional CISO is almost always the right first move. You get senior ownership, you clear the deals and audits that are stuck, and you defer a $200K+ hire until the workload genuinely justifies it. When it does, you will know, and you will hire from a position of maturity instead of panic.