Reading the portco marketing P&L like an IC member, not a CMO

A sponsor sits down at a portco board meeting and opens the marketing section of the deck. They see a budget. They see an actual. They see a variance percentage. They see a channel pie chart. None of it answers the question they actually have.

The question every IC member has, in every quarter, is some version of the same thing: if I cut this in half, what happens to revenue?

Marketing P&Ls are written for the wrong audience

Most portco marketing P&Ls are written by marketers, for marketers — with finance review for accuracy. They organize spend by channel because that's how the marketer's calendar is organized. They report performance against impressions, clicks, or cost-per-lead because those are the numbers the marketer is judged on.

Sponsors don't think in those units. They think in EBITDA, MOIC, and the bridge between today's run-rate and the exit thesis. The marketing P&L they need is structurally different.

The IC-grade marketing P&L

An IC-grade marketing P&L organizes spend along three axes that a sponsor can underwrite:

Axis 1: Fixed brand vs. variable demand

Brand investment compounds across the hold and protects pricing at exit. Demand capture spend (paid search, performance social, local) is variable and should flex with platform unit economics. Lumping them into one line item hides which half of the budget the sponsor is actually evaluating.

The right report shows brand spend as a percentage of revenue trending across quarters, and demand-capture spend trending against booked-revenue contribution. The first answers 'are we building equity?' The second answers 'are we operating efficiently?'

Axis 2: Sourced revenue, not lead volume

Lead volume is a lagging vanity metric. Sourced revenue — closed business attributable to a marketing channel within an audited methodology — is the metric sponsors should review. Every channel rolls up to a sourced-revenue contribution. Every channel has a payback period. Channels with payback longer than the unit-economics threshold the sponsor underwrote at acquisition get reviewed quarterly.

Axis 3: Marketing's contribution to EBITDA, modeled

Marketing's job in a portco isn't to deliver impressions or even leads. It's to contribute measurable EBITDA. The IC-grade report models four levers explicitly:

• Customer acquisition cost trend, normalized for channel mix shift
• Booked-call rate improvement and its revenue contribution
• Average ticket trend, separated by lead source
• Vendor cost reduction (the line that gets cut when value creation works)

Each lever has a target, a current state, and a quarter-over-quarter trend. The sponsor can read the marketing section in four minutes and know exactly which levers are tracking against the thesis.

If the marketing report doesn't answer 'what would happen if we cut this in half,' it's not a report. It's a status update.

Five questions every IC member should ask

1. What share of revenue is sourced through paid channels, and what's our payback period?
2. What's the trend on customer acquisition cost — normalized for channel-mix shift, not raw blended?
3. What's our brand investment as a percentage of revenue, and how does that compare to where it needs to be at exit?
4. Which channels' payback periods exceed the unit-economics threshold we underwrote at acquisition?
5. If we cut the marketing budget by 30% next quarter, which lines do we cut, and what happens to sourced revenue?

Question five is the most important. If the portco can't answer it — specifically, with a sourced-revenue model — the marketing function isn't operating at sponsor grade yet. That's the work of the value-creation install.