How to structure a part-time CMO engagement: hours, cost, and what to hold them to
'Part-time CMO' and 'fractional CMO' describe the same arrangement - the difference is which word the company searching happened to type. What actually needs deciding isn't the label. It's the hours, the cost, and the clause in the contract that determines whether this person is accountable for a result or just for showing up.
Part-time and fractional are the same job
Both describe a senior marketing executive working inside a company on a reduced schedule, typically one to four days a week, sitting on the leadership team rather than on an agency roster. They own strategy and are accountable to revenue outcomes. A CMO-as-a-service arrangement is a genuinely different structure - a team of specialists behind one commercial relationship, accountable for deliverables rather than for the number moving.
The hours and the cost
The engagements I have been offered and turned down sit at 10 to 25 hours a week and $5,000 to $15,000 a month, with the number moving on the executive's experience level and how much strategic complexity the account actually carries. A four-person startup deciding its first paid channel sits at the low end of that range. A company running six figures a month across three channels, with a team underneath the CMO to direct, sits at the high end.
The ceiling on what a part-time schedule can cover is real. Ten to twenty-five hours a week buys strategic direction, team guidance, and executive decisions - it doesn't buy hands-on execution across every channel a growing company runs. A part-time CMO who also builds every landing page and writes every ad isn't part-time anymore, and the rate on the contract should reflect whichever job actually gets done.
Run the top of that range through the math and the hourly rate becomes visible: 25 hours a week is about 108 hours a month, 25 times roughly 4.3 weeks, and $15,000 divided by 108 lands close to $140 an hour. That's a senior specialist's rate, and it's the number worth comparing against what a full-time hire at this level would actually cost in salary, payroll tax, and benefits combined - not against the full-time salary figure alone.
What to put in the contract
Hours alone don't make an engagement accountable. The contract should name what gets delivered in the first thirty, sixty, and ninety days - typically an audit of the current funnel and tracking, a written strategy with named channels and budgets, and a first read on which of those channels actually earns more spend. After that, deliverables shift to reporting cadence: what gets reviewed weekly versus monthly, and against which numbers.
The measurement clause is where most of these contracts go soft. 'Strategic outcomes' sounds accountable and measures nothing. The engagement needs at least one number both sides agree to check against - cost per acquisition, pipeline contribution, blended ROAS, whatever the business actually runs on - reviewed on a fixed schedule.
- Deliverables at day 30, 60, and 90, named specifically
- Reporting cadence: what's reviewed weekly vs. monthly
- At least one hard number both sides check the engagement against
- Scope boundary: strategy and direction vs. hands-on execution
- Exit clause: notice period and what happens to the strategy on file
When the model stops fitting
A schedule of ten to twenty-five hours a week runs out of room in a specific way: reports keep repeating the same short list of priorities, not because the priorities are wrong but because nobody with daily authority is around to push them past the planning stage. That's usually the point where a company has outgrown a part-time seat and needs either a full-time hire or a part-time CMO paired with a dedicated in-house manager who executes between the CMO's sessions.
The opposite failure shows up as underuse. A monthly retainer where the strategy hasn't materially changed in two quarters, and the reporting call is mostly a status update rather than a decision point, is a sign the engagement should shrink - a quarterly audit and advisory arrangement instead of a standing weekly seat. Both cases come down to the same mismatch: hours bought against the live decisions the business generates that month.
The audit-first approach
Before agreeing to hours or a monthly rate, it's worth running the funnel and tracking audit that would normally be the first thirty-day deliverable - as a standalone step, before committing to an ongoing engagement at all. That's the shape of my own consulting work in this space: a thirty-minute intro call to hear the bottleneck, then an audit of the funnel and tracking that produces a prioritized plan. Whether that plan turns into weekly ongoing work or a one-time fix list gets decided once the audit is actually in hand.
FAQ
Is a part-time CMO different from a fractional CMO?
Structurally, no. Both describe a senior marketing executive working reduced hours inside a company's leadership team, accountable to revenue outcomes. The two terms exist because people search both; the model behind them is the same one.
How many hours does a part-time CMO typically work?
Ranges cited by firms placing these roles run 10 to 25 hours a week, moving with the executive's experience level and the account's strategic complexity.
What should the first 90 days of a part-time CMO engagement include?
A funnel and tracking audit, a written strategy naming channels and budgets, and an early read on which channels earn more spend. Deliverables after that shift to a fixed reporting cadence against agreed numbers.
The same work, without the agency layer
I run the buying myself: my accounts, my tracking, a report the finance side can read.
