Fractional CMO at $10K, $180K full-time hire, or agency retainer.

Every founder hits the same fork around $5M ARR. The CEO is still writing the marketing brief. The product is shipping faster than the demand is following. Three paths show up on the whiteboard. A fractional CMO at $10,000 a month. A full-time senior marketing hire at $180,000 plus equity. A full-service agency retainer at $35,000 a month. The math feels arbitrary because nobody puts the hidden costs on the slide.

This piece puts them on the slide.

The three paths, defined

Path one is a fractional CMO. A senior operator who runs marketing for you 10 to 20 hours a week. Strategy and team direction on a recurring engagement. Specialists slot in underneath them as needed. The fractional CMO carries judgment; they do not personally execute every campaign.

Path two is a full-time senior marketing hire. A VP or Director of Marketing at $180,000 base, plus benefits, plus equity, plus the cost of their first three hires. Full-time judgment, full-time execution, full-time pager. The person becomes the marketing function for at least the next 18 months.

Path three is a full-service agency retainer. A mid-market agency that runs a coordinated team across paid, content, lifecycle, and creative for a flat monthly fee. The agency carries the function in production; an account director plus a strategist supply the senior layer. The founder is the client.

Twelve-month scenario math

The headline numbers nobody disputes.

Path	Monthly	12-month direct	12-month loaded
Fractional CMO	$10,000	$120,000	$155,000
Senior hire ($180K base)	$15,000	$180,000	$295,000
Full-service agency retainer	$35,000	$420,000	$455,000

"Loaded" includes the costs the spreadsheet usually leaves off. For the fractional CMO that is paid specialists slotting in underneath (call it $35,000 across the year). For the senior hire that is benefits (24%), equity dilution charged at the carrying cost of the cap table room, recruiting fees (20% of base), and the typical 3-month ramp where output is below trend. For the agency retainer that is ad spend pass-through, tool subscriptions, and the rev-share on creative the agency owns.

The numbers diverge but each path solves a different problem.

The hidden costs nobody puts on the slide

Fractional CMO hidden costs. The operator is split across multiple clients. Your Tuesday call competes for the operator's attention with three others. The senior layer is real, but the execution layer is yours to staff. If you do not have specialists to slot in underneath, the fractional CMO becomes a brilliant strategist with no team to run the plan.

Senior hire hidden costs. The first three months produce strategy documents, not pipeline. The hire then spends six months hiring their first lieutenants, which costs another $250,000 in fully-loaded headcount. The function does not actually run at scale until month nine. If the company exits or the strategy shifts before month 18, the senior hire becomes severance plus the cost of replacing them.

Agency retainer hidden costs. The senior layer at the agency is split across the agency's client book. Your account director may have 8 to 12 active clients. The strategist may be reviewing your brief at 9:30 PM on a Wednesday because the agency is on its own Monday-to-Friday rhythm. Mid-quarter changes go through the agency's change-order process, which adds 2 to 3 weeks of latency to any meaningful pivot.

None of these are fatal. All of them are real. The hidden costs scale with the maturity of the engagement, not with the size of the spreadsheet you used to choose it.

The question to ask before any of it

Before picking a path, the only question worth answering is what does marketing leadership owe the company in the next 12 months?

Three answer patterns:

• Set the function up. The company has no marketing leader, no playbook, no demand engine. The job is to install a function from scratch. Define the ICP, set up the stack, hire the first specialists, establish the operating cadence.
• Run the function in motion. The function exists. The leader is the bottleneck. The job is to absorb every meaningful decision and ship work that compounds. Twenty meaningful decisions per week, every week.
• Scale a working function. The function is shipping. The leader is fine. The job is to add specialist throughput without breaking the operating cadence.

Each answer maps cleanly to one of the three paths.

When each path wins

Fractional CMO wins when the answer is "set the function up." A senior operator who has installed marketing functions before will get the architecture right in a quarter. Hiring a full-time VP to do this work loses 90 days to ramp; hiring an agency to do this work loses the architecture itself because agencies inherit a stack rather than designing one. The fractional CMO carries the design judgment that compounds for the next two years.

Senior hire wins when the answer is "run the function in motion." Twenty meaningful decisions per week requires a full-time leader. A fractional cannot be on the Slack channel at 4 PM to call the audit. An agency does not have the context to call it at all. If your function is running and the leader is the bottleneck, hire the leader.

Agency retainer wins when the answer is "scale a working function." The leader exists, the playbook works, the system is shipping. The constraint is throughput. An agency adds 4 to 8 specialists, full-time-equivalent, for less than the loaded cost of one in-house hire. The trade is that you lose context-depth in exchange for capacity. If your function is mature enough that context is encoded in playbooks, the trade is good.

The hybrid pattern most companies actually run

The honest answer is that most $5M to $50M companies run two paths in combination. A fractional CMO from month 1 to month 12 sets up the function and stabilizes operations. Around month 9 the company makes its first full-time senior marketing hire. The fractional steps down to advisor over the next 90 days. The senior hire takes over.

The agency retainer enters at month 18, when the playbook has compounded and capacity is the constraint. The agency executes against a playbook the in-house team owns rather than designing the playbook themselves.

Total 24-month spend in this hybrid: roughly $440,000 on the leadership side, plus whatever ad spend the function is operating against. The compounding is real because each phase produces an artifact (architecture, playbook, capacity model) the next phase builds on. The non-hybrid paths re-build that artifact every time leadership turns over.

Where Next Best Action enters the math

None of the three paths above touch the question of visibility. The fractional CMO carries judgment in her head. The senior hire reports up to the founder once a week. The agency sends a Friday deck.

The founder still does not see the work between the touchpoints. The CFO still does not have a per-decision audit trail. The renewal conversation still depends on whoever is in the room.

Next Best Action is the workspace that sits underneath any of the three paths. The fractional CMO uses it to give the founder real-time Status. The senior hire uses Ask to query the team's progress without an interrupting call. The agency uses Approve so the founder can clear decisions in two minutes instead of a Tuesday meeting.

NBA is not the leadership choice. It is the operating layer that makes whichever leadership choice you made transparent to the company that hired them.

For founders evaluating the three paths today, the suggestion is simple. Pick the path that matches the answer to "what does marketing leadership owe the company in the next 12 months." Then put the work into a Status, Ask, Approve workspace so the founder, the CFO, and the named leader see the same surface every Monday morning.