Private label profit is an eight-bucket subtraction chain, and the spreadsheet usually stops after four. It reported 44%; the bank statement reported 23.2% on the same product and price — the gap is the cost buckets private label sellers forget to count, and every one of them is a real invoice you will pay.
| Version | What it counts | Result |
|---|---|---|
| "Paper" estimate | Price − cost − referral − fulfillment | ~44% |
| Real eight-bucket model | Adds fuel, ads, freight, returns, storage, placement | $6.96 / 23.2% |
| Break-even price | Where net profit hits zero across all buckets | $20.57 |
The missing lines — freight ($1.50), returns ($1.35), ads ($3.00), fuel ($0.15), storage and placement — are the difference between a launch plan and a launch bill. Target 20–30% net margin at maturity; anything under 10% has no room for a return wave or a Q4 storage spike.
Remember the launch-to-mature arc: first-quarter ACoS runs 20–30% while reviews build, then settles to 10–20%. A product that only clears 20% at the mature rate is fine; one that only clears it at launch rate will die the moment ad spend normalizes. Run the calculator twice — once at launch ACoS, once at target — and judge the SKU on the weaker result.
Profit math is also not cash math. A 1,000-unit first order ties up roughly $10,000–11,000 of working capital that takes 60–90 days to cycle back, even when the unit economics look clean. Margin and liquidity both have to work before the reorder.
Model your exact product in the calculator, then validate the niche with the scorecard — both run in your browser, no login:
Because the spreadsheet usually stops at item cost, referral and fulfillment. The missing buckets — inbound freight, return amortization, Q4 storage, placement fees and the 3.5% fuel surcharge — turn a 44% paper margin into a 23.2% real one on the same $30 product. Count all eight buckets before you reorder.