Margin is a per-SKU question
A store's blended margin is an average, and averages are where losing SKUs hide. The number that runs an e-commerce business is contribution per unit, per SKU: selling price, minus the platform's referral or processing fees, minus fulfillment, minus landed cost, minus a returns allowance, minus the ad spend that actually drove the order. On Amazon a referral fee near 15% plus FBA charges come off before you see money; on Shopify the processing fee is smaller but you bought the click yourself. The same product can be profitable on one channel and underwater on the other.
Ad spend is the line most reporting fudges. Account-level ratios like TACoS can look healthy while two hero SKUs quietly subsidize a tail of products whose ads never pay back. We attribute ad cost to the SKU it sold and rank the catalogue by contribution every month, so the kill, reprice, bundle or stop-advertising calls are made from a list, not a feeling. That scorecard is the spine of our Fractional CFO engagement for sellers.
Finance the cash cycle on purpose
Profitable inventory businesses run out of cash because money spends months as stock before it becomes a payout. Measured in days from your own books, that gap is a number you can manage before you finance it: push supplier terms past the standard deposit-and-balance once you have order history, buy tighter quantities more often when the price break does not beat the carrying cost, and liquidate dead stock instead of paying to store it. Whatever gap remains gets funded deliberately, and the options are not equal.
| Inventory financing | Cost shape | Fits when |
|---|---|---|
| Retained profit | The cheapest money available, taxed once at the small-business rate | The store earns more than the owner needs to draw |
| Bank operating line | Interest only on the drawn balance; lenders want statements they can trust | Steady sales with a seasonal bulge to bridge |
| Revenue-based advance (Shopify Capital and similar) | A fixed fee, repaid as a share of daily sales | Fast money against a proven product; repayment bites hardest in your best weeks |
| Purchase order financing | A fee per funded PO cycle | A large confirmed order the balance sheet cannot cover alone |
Lenders say yes to sellers whose numbers hold up under questions. CPA-prepared statements through a compilation engagement and a forecast that ties to platform data are usually the difference, and Walla's years in banking and corporate finance mean the financing file is built the way the person reading it expects.
Q4 is bought in August
The peak that pays for the year is committed months before it happens. Work the calendar backward from Black Friday: receiving and inbound time, ocean freight, production lead time, and most Q4 purchase orders must be placed by late summer with deposits to match. The forecast behind that PO deserves scrutiny because the errors are not symmetric. Run out in November and you lose the sales plus the ranking that feeds next year; overbuy and you carry peak storage surcharges into January markdowns.
We structure the Q4 buy as a commitment plus a decision point: a core quantity ordered early, a smaller top-up held back that can travel by air if October numbers justify the freight premium, and a January cash plan that already contains the returns wave, the HST remittance on peak sales and the supplier balances that all arrive in the same quiet month.
Channel mix is a margin decision, not a revenue one
Amazon, a Shopify store and wholesale accounts are three different businesses wearing one brand. Amazon brings velocity and takes fees, control and the customer relationship; the DTC store keeps more of each sale but you pay for every visitor; wholesale trades margin for volume, zero ad spend and a receivable you wait on. Comparing channels by revenue flatters the biggest one. Comparing them by contribution after channel-specific costs, ads included, tells you where the next dollar of inventory belongs.
Concentration is the other axis. A store earning most of its living through one marketplace account carries a risk no margin number captures, and how much near-term margin to sacrifice building a second channel is a CFO decision we put on the table with numbers attached.
Add the 3PL when the cost per order says so
Self-fulfillment is rarely free; it hides its cost in your garage, your evenings and your growth ceiling. The honest comparison prices your fully loaded cost per order, with space, packaging supplies and your own hours at a real rate, against a 3PL's receiving, storage and pick-and-pack fees, with Q4 capacity and order cut-off times in the equation. FBA usually answers the Amazon side already; the live question is the DTC orders, and the warehouse corridor around Mississauga and Pearson gives GTA sellers no shortage of 3PLs to quote.
The switch tends to pay once your own packing hours become the most expensive labour in the company, or the first time a Q4 nearly breaks the operation. A monthly CFO cadence keeps decisions like this scheduled instead of postponed, scoped and quoted in writing after a free 15-minute discovery call.
