What is the difference between an interim CMO and a fractional CMO?

An interim CMO is a placeholder running the existing playbook until a permanent CMO arrives. A fractional CMO is an operator changing the playbook itself.

How long does each role last?

Interim: 3-12 months, defined by the executive search timeline. Fractional: indefinite, defined by the work the function needs done.

Fractional CMO · vs Interim CMO

Fractional CMO vs Interim CMO

Interim CMOs are placeholders. Fractional CMOs are operators. The two get conflated because both are part-time. The work is structurally different.

Most companies that say they need an "interim CMO" actually need a fractional CMO. The terms get used interchangeably and they should not.

The difference is what the role is hired to do. An interim CMO runs the company through a transition. A fractional CMO changes what the marketing function is.

Dimension	Fractional CMO at IG	Interim CMO
Primary purpose	Change the playbook	Run the existing playbook
Time horizon	Indefinite (6-24+ months)	Defined (3-12 months until permanent hire)
Strategic mandate	Build the function	Keep the function running
Hiring trigger	Function needs senior leadership	Departing CMO left a gap
Exit shape	Hand off operating manual	Hand off to the permanent hire
Fit for early-stage scale	Yes	No (no playbook to keep running yet)

Primary purpose

IG: Change the playbook

Interim CMO: Run the existing playbook

Time horizon

IG: Indefinite (6-24+ months)

Interim CMO: Defined (3-12 months until permanent hire)

Strategic mandate

IG: Build the function

Interim CMO: Keep the function running

Hiring trigger

IG: Function needs senior leadership

Interim CMO: Departing CMO left a gap

Exit shape

IG: Hand off operating manual

Interim CMO: Hand off to the permanent hire

Fit for early-stage scale

IG: Yes

Interim CMO: No (no playbook to keep running yet)

When you actually need an interim CMO

A CMO just left. The board needs continuity while they run the executive search. The team needs someone to maintain the campaign calendar, manage the agency relationships, and not break what is running. The interim CMO is a steady hand on the wheel.

This is the role most "interim CMO" engagements are actually filling. It is a placeholder role with a defined end state: the permanent hire arrives.

When you actually need a fractional CMO

The marketing function does not have a playbook to run, or the playbook is producing the wrong outputs. The board does not want to commit to a permanent CMO until the function shape is clear.

The fractional CMO builds the function: positioning, pipeline architecture, attribution, team design, AI deployment. The engagement ends when the operating manual is handed off to a permanent leader or to the operating team running the system the fractional CMO built.

The diagnostic question

Ask: "Are we hiring this person to keep things running while we find the real CMO, or are we hiring this person to figure out what marketing should be at this company?"

If the answer is the first, hire an interim. If the answer is the second, hire a fractional CMO.

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