Fractional vs Interim Executive: Not the Same Hire
One is a permanent part-time seat. The other is a full-time bridge. Hiring the wrong one wastes a quarter.
Erin Moore
Fractional Chief AI Officer
A fractional executive is a permanent part-time seat; an interim executive is a temporary full-time one. The distinction is not hours — it is whether you are filling a gap until someone arrives, or deliberately buying a role you do not need full-time. Confusing the two is how companies end up paying full-time rates for a function that never justified them.
Interim: a bridge
You hire an interim when a full-time seat exists, is currently empty, and needs covering — a CFO left mid-audit, a COO is on leave, an acquisition needs integrating. The engagement is full-time, short, and ends when the permanent hire starts.
The right interim is someone who can absorb context fast and hand over cleanly. Continuity is not the point; stabilisation is.
Fractional: a deliberate fraction
You hire a fractional executive when the function genuinely does not require a full-time person, and you would rather have senior judgment part-time than junior judgment full-time. The engagement is open-ended, and continuity is the entire value — see what is a fractional executive.
This is the usual case for AI leadership in growing businesses. Most companies under roughly $50M in revenue make a handful of consequential AI decisions a quarter, which is a real seat and not a full-time one.
The mistake in each direction
Hiring interim when you needed fractional means paying full-time rates for a role with part-time decision volume, then facing a cliff when the engagement ends and nobody owns the function again.
Hiring fractional when you needed interim means putting a part-time person into a job with full-time execution load. They will spend their limited hours on operational firefighting rather than the decisions you engaged them for, and both sides will be frustrated by month three.
The test is decision volume versus execution load. Sustained execution load is an interim or a permanent hire. Recurring decisions with modest execution are fractional.
What about "fractional to permanent"?
It happens, and it is a reasonable path when a company grows into the seat. Agree upfront what would trigger the conversation — usually decision volume outgrowing the arrangement — so it is a planned transition rather than an awkward one. How to hire a fractional executive covers the contract terms that make this clean.
Frequently asked questions
What is the difference between fractional and interim? Interim is temporary and full-time, covering an empty seat until someone permanent starts. Fractional is ongoing and part-time, for a function that does not justify a full-time person at all.
Which do I need? Compare decision volume against execution load. Sustained execution work points to interim or permanent. Recurring decisions with modest execution point to fractional.
Can a fractional engagement become permanent? Yes, and it is worth agreeing upfront what would trigger that conversation — typically decision volume outgrowing the arrangement — so the transition is planned.
Do they cost the same? No. Interim is priced as full-time work for a short period. Fractional retainers commonly run $5,000 to $30,000 a month depending on scope and decision rights.
Further reading
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