A fractional CFO for ecommerce brands that want profit, not just revenue

This work is built for brands selling branded physical products — consumables that reorder and high-ticket finished goods — on Shopify, Amazon, and increasingly across both. It is a specific kind of business with a specific trap: revenue can climb quarter after quarter while profit and cash quietly move the other way. The dashboard says you are winning; the bank account disagrees.

That gap is almost always an economics problem hiding behind a growth story. Ad costs creep, discounts become a habit, returns eat margin, fulfillment fees drift, and every incremental order makes a little less than the last. Left unmeasured, the brand scales its way into a cash squeeze. The job of a fractional CFO here is to make the real economics visible — per order, per SKU, per channel — and then to build the operating system that keeps them healthy as you grow.

Why Shopify's dashboard isn't a P&L

Shopify is an excellent commerce platform and a poor accounting system. It shows you revenue and, if you have loaded product costs, a gross margin. What it does not show is the true profit of an order, because the costs that actually determine profitability live somewhere else. Ad spend sits in Meta and Google. Fulfillment and pick-pack fees sit with your 3PL. Payment processing skims a few points off every transaction. Returns land days or weeks later. None of that flows back into the Shopify view, so the number founders stare at all day is structurally incomplete.

The fix is not a prettier dashboard; it is a different metric. You need to know contribution margin — what an order keeps after every variable cost — and you need it at the SKU and channel level. For a full walkthrough with a worked example, read the Shopify contribution margin guide.

Contribution margin is the operating metric

Contribution margin is best read in tiers, each one peeling back another layer of variable cost:

• CM1 — revenue minus COGS. The raw product profit before you touch the customer.
• CM2 — CM1 minus shipping, fulfillment, and payment processing. What's left after getting the order out the door.
• CM3 — CM2 minus advertising and acquisition cost. This is the number that tells you whether an order actually made money once you paid to win the customer.

After CM3, only fixed operating costs remain before you reach net profit. Viewing margin this way changes decisions. A SKU with a healthy CM1 can be a cash loser at CM3 if it only sells through expensive paid channels. A channel that looks great on platform- reported ROAS can be underwater once you count blended acquisition cost and returns. This is exactly why ROAS alone misleads — it measures ad efficiency, not profit. The metric that should set your budget is contribution margin after ad spend, which is the argument I make in MER vs ROAS. And when revenue rises while profit falls, the diagnostic almost always runs through these tiers — see revenue up, profit down.

What the engagement covers

An ecommerce engagement is built around three modules, wrapped in a monthly operating cadence.

• Demand Planning — SKU-level replenishment, purchase order timing, and the inventory-to-cash cycle, so you buy enough to grow without tying up cash you'll need elsewhere. More on the mechanics in demand planning for DTC brands.
• Marketing Investment — CAC and payback by channel, budgets set on contribution margin after ad spend rather than last week's ROAS screenshot, and a simple scorecard the team can run against weekly.
• Financial Modeling — a 12-month driver-based model with scenarios, so you can test a price change, a new channel, or a big inventory buy before you commit the cash.

Around those modules runs the Growth Finance operating system: a reliable monthly close, a rolling 13-week cash forecast that accounts for inventory purchases, and a KPI board pack that tells you at a glance whether the brand is healthy. Together they turn a pile of platform reports into a business you can steer.

Built by someone who's bought ecommerce brands

I did not learn ecommerce finance from the outside. Across my time at Heyday and Essor I evaluated and closed 12+ ecommerce acquisitions, part of $3B+ in transaction experience and the $500M+ Essor merger. I have sat on the buy side of the table and underwritten brands the way institutional acquirers do — reading contribution margin by SKU, testing the durability of repeat purchase, and pressure-testing every growth claim against the cash it consumed.

That perspective does two things for you. Day to day, it means the financial system I build reflects what actually drives value in a brand, not vanity metrics. And when the time comes to sell, it makes this the natural on-ramp to exit planning: the same numbers that run the business well are the ones a buyer will underwrite. If your model is SaaS rather than physical products, the equivalent work lives on the SaaS CFO page, and you can see the full menu of work on the fractional CFO services hub or in the services pyramid.

Profit analytics, built in

Measuring contribution margin at scale is easier with the right tool. ProfitGenie — a profit analytics product I'm involved with — is built to surface exactly the SKU- and channel-level economics discussed here. You'll find more on it in the ProfitGenie section of the homepage. The tool sharpens the numbers; the CFO work turns them into decisions.