THE CURRICULUM / Conclusion

6.3P&L Template

Contribution margin, break-even ROAS, cash versus profit, blank skeleton.

5 min read

The month closes. More revenue went through the store than in any month before it, you have told two people about it, and the balance on the thirty-first is lower than it was on the first. Nothing has gone wrong. You are reading the only number the platform shows you, and it is the one number that cannot answer the question you are asking.

Gross revenue falling to net profit. The top bar is gross revenue, drawn full width. Each line below removes a slice of it in order: refunds and chargebacks, cost of goods, shipping and fulfilment, payment and platform fees, advertising, and apps, tools and subscriptions. The solid bar in each row is what is still left at that point and the dotted piece beside it is what that line took. Every slice is drawn the same width on purpose, because no cost structure is being claimed. What remains at the bottom is net profit. No amounts, percentages or currency appear.
The shape the skeleton fills in.
  1. Revenue is the least useful: it can be bought, and rises with spend whether or not any of it survives.
  2. Contribution margin is what remains after every cost that varies with an order. It buys customers.
  3. Net is what remains after fixed costs. By the time net is wrong, the cause is above it.

WORK PER ORDER BEFORE PER MONTH.

a month is one unit, repeated

A worked example of one order at seventy nine dollars ninety five drawn as a single vertical bar cut into slices, each sized by the dollars it takes. In order down the bar: the ATO takes seven dollars twenty seven in GST, the factory eleven forty, freight and customs three sixty, the courier twelve ninety nine, the payment processor one seventy, refunded buyers one twelve, the platform and apps one eighty seven, the ad platform twenty eight dollars, and the seller keeps twelve dollars. The ad platform slice is thirty five per cent of the order and the seller's slice is fifteen per cent. The nine slices add to seventy nine dollars ninety five exactly. It is a worked example, not a quote and not a result.
WORKED EXAMPLE. One order at one stated price, and every hand that takes a piece of it before you see any of it.

A negative unit does not improve with volume, it only arrives faster. Per order also stays comparable while everything around it moves — a month is contaminated by seasonality, by one odd invoice, by the week you were away.

One selling price drawn as a vertical stack of the cost lines that consume it: product cost, shipping, duties and fees, payment fees, the cost of the sale, and what is left. The segments are drawn equal because no proportions are being claimed.
One selling price, and the lines that consume it.

BREAK-EVEN ROAS, IN FOUR LINES

  1. Contribution margin ratio is contribution margin divided by net revenue.
  2. At break-even, advertising eats exactly the contribution: ad spend equals net revenue times the ratio.
  3. ROAS is revenue over ad spend. Substitute: revenue over (revenue times the ratio).
  4. Revenue cancels. Break-even ROAS is 1 divided by the ratio.
A curve of break-even return on ad spend against contribution margin. Break-even ROAS is one divided by contribution margin, so the curve falls steeply as margin rises: a thin margin needs a high multiple to break even, a fat margin needs a low one. This is arithmetic, not a target.
The floor rises as contribution falls.
One refund traced through every line it lands on. The product is not back on the shelf: it is with the buyer, in the post back, or not coming back at all. The shipping out is already spent, because the carrier moved it once and that work is done and paid for. The shipping back is paid by someone, and if you take the order back the return leg is a second freight cost on one order. The ad spend is already spent: it bought this order, the order went away, and the spend did not go with it. The processor fee depends on your own agreement, which sets what comes back and what is kept. Your time is the line nobody bills you for: the message, the decision, the paperwork, and the next one arriving behind it. The sale reverses; the costs it already made do not. No amounts, fee percentages or refund rates are shown.
Every line a refund lands on, including the one nobody bills you for.

CASH IS NOT PROFIT

The order in which money moves. First ad spend leaves, charged while the ads run whether or not anything sells. Then stock is paid for, before the goods move and long before they arrive. Only then does the payout land, released on the processor's schedule rather than on the day of the sale. Everything between the first payment out and the money landing is funded out of your own account, which is why a profitable month can still empty it. No amounts or lead times are shown.
Charged daily, paid out late, stock bought early.

Timing differences, not losses — and timing differences are what insolvency is made of. Track the balance beside the P&L.

A worked example of two invented stores with identical revenue and opposite outcomes. Both sell three hundred and ten orders of the same bottle at seventy nine dollars ninety five, so both take twenty four thousand seven hundred and eighty four dollars fifty. Store A pays three thousand five hundred and thirty four for goods, one thousand one hundred and sixteen for freight, four thousand and twenty six ninety for delivery, three hundred and forty seven for returns, five hundred and eighty for apps, and eight thousand six hundred and eighty for advertising, ending at twenty one thousand and sixty three eighty five out and three thousand seven hundred and twenty dollars sixty five net. Store B pays four thousand six hundred and nineteen, two thousand six hundred and four, five thousand one hundred and fifteen, one thousand one hundred and ten forty two, one thousand one hundred and eighty, and twelve thousand two hundred and seventy six, ending at twenty nine thousand six hundred and eighty four twenty nine out and a loss of four thousand eight hundred and ninety nine seventy nine. The gap of eight thousand six hundred and twenty dollars forty four is broken down line by line: advertising three thousand five hundred and ninety six, freight one thousand four hundred and eighty eight, delivery one thousand and eighty eight ten, goods one thousand and eighty five, returns seven hundred and sixty three thirty four, and apps six hundred. None of the gap is at the top of the page. It is a worked example, not a quote and not a result.
WORKED EXAMPLE. Same revenue at the top, and where the difference actually went.

Contribution-margin P&L

Line itemPer orderPer monthWhat belongs
Gross revenue——Before deductions
Discounts and refunds——Redeemed codes, refunds as they fall
Net revenue——What the ratios use
COGS——Unit cost, freight, duty
Shipping and fulfilment——Outbound, packaging, pick, pack
Payment fees——Percentage, fixed, currency, disputes
Platform and app fees——Per order
Contribution margin——Net revenue minus variable lines
Ad spend——Every platform
Contribution after ad spend——Before fixed costs
Fixed costs——Payable regardless of orders
Net——The honest figure

Per order first. If that fails, per month only says how fast.

Three tiers of number ranked by how much you can trust them. Measured: money that landed in the bank, orders in your admin, invoices you paid. Modelled: platform-attributed conversions, anything with a lookback window, blended estimates. Unknown: what you assumed, what you were told, what you hope. This is a rank, not a score.
Three tiers, ranked by how much you can trust them.
Statement poster: "Revenue is a screenshot. Margin is a lifestyle."

THE CADENCE

  1. Daily: ad spend, orders, balance. No decision from them alone.
  2. Weekly: contribution margin and ad cost per order, from actuals. A drifting cost is caught while small.
  3. Monthly: the whole skeleton, from statements.
  4. On any cost change: re-derive the ratio and the ROAS floor.
The four skills an ecommerce operator ends up owning, drawn as a stack that is read from the bottom up. Choosing what to sell is the base, with nothing under it: without it every skill above is wasted. Making the creative rests on that: without it you buy attention for nothing. Buying the media rests on that: without it nobody is ever shown any of it. Managing the cash sits on top: without it the business can grow and still run out. They are acquired in that order, each one rests on the one below, and none of the four is optional. No hours, difficulty or cost is claimed.
Cash sits on top. Without it a business can grow and still run out.

TAKEAWAYS

  • Revenue is the number everybody quotes and the least informative. It can be bought.
  • Contribution margin is the money that buys customers and covers fixed costs.
  • Break-even ROAS is 1 divided by your contribution margin ratio.
  • A profitable month can still empty the account. Track the balance beside the P&L.

CHECK YOURSELF

A month shows a positive net on the P&L, but the bank balance is lower than it was at the start. What is the most likely explanation?

Why is gross revenue the least useful of the three headline numbers?

DO THIS BEFORE THE NEXT MODULE

  1. 01Build the per-order column of the skeleton for your current product, taking fees from an actual statement rather than the published rate.
  2. 02Derive your own break-even ROAS from your contribution margin ratio, writing out the four substitution lines rather than copying the number.
  3. 03Find your processor payout delay and map one month of ad spend against settlement dates to see where the gap is widest.
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