TheQuestionWeAskThatMakesCFOsUncomfortable

"What's the contribution margin on this product after you've accounted for the promotional discount that 70% of purchasers use?"

Silence.

Then: "We'd have to get back to you on that."

Why this question matters:

Finance teams know gross margin. They know COGS. They know overhead allocation.

What they often don't know is the gap between list price margin and realised margin after discounts, returns, and promotional leakage.

That gap is where profit disappears.

The typical scenario:

Product has 60% gross margin on paper.
20% discount code applied to 70% of orders.
15% return rate on that product.
Free shipping on orders over £50.

The 60% margin is now closer to 35%. The CPA that "works" at 60% margin is wildly unprofitable at 35%.

But nobody calculated it. Because finance looks at aggregate margin and marketing looks at platform ROAS and nobody connects them.

Other questions that create silence:

• "What's the return rate on products sold via paid ads versus organic?"
• "How does promotional timing affect the cohort LTV of acquired customers?"
• "What percentage of 'new customers' are actually existing customers on new email addresses?"
• "What's the incremental revenue from this campaign versus revenue that would have happened anyway?"

Why CFOs don't like these questions:

Because the answers often reveal that the "profitable" marketing everyone celebrates is actually destroying margin.

Because it requires work that nobody has done.

Because the truth is uncomfortable.

Why we ask anyway:

Because without these answers, we're just optimising in the dark. And optimising in the dark usually means optimising towards the wrong thing.