A negative SKU almost always comes down to one of three causes: you priced below break-even, your returns beat the model, or storage is eating the cushion. Sales volume never fixes a per-unit loss — it just makes the hole wider faster. Match your symptom to the row below.
Two of the three look identical from inside Seller Central: the payout number is simply low. The difference shows up in which report you open. Below-break-even shows on every order; returns show in the refunds report; storage shows on the monthly bill, and only in certain months.
| Cause | What it looks like | The fix |
|---|---|---|
| Price below break-even | Fee preview shows payout lower than fees; the unit looked profitable in a 2-fee estimate but bleeds in reality | Raise price to at least 20% above the break-even price — $20.57 on the standard $30 example means pricing near $25+ |
| Returns above the modeled rate | Refunds spike after the first month; you modeled 6% and apparel is running 20–30% | Re-model with the real category average, then fix the listing (size charts, honest imagery) |
| Storage drag | Monthly bill climbs from October on; inventory age report shows 90+ days | Liquidate slow stock before Oct 15 and keep average days in FBA below 60 |
Open the fee preview on one recent order and look at the payout line. If the number is below your cost-plus-fees estimate, you have a pricing problem, not a traffic problem. Next, divide refunds by units sold over the last 90 days — if the result is far from the 5–8% typical of home goods, returns are your second leak. Finally, check the inventory age report: anything sitting through October bills at $2.40/ft³ instead of $0.78.
The triage order is fee preview first, refunds second, inventory age third. Ten minutes of checking beats a month of guessing — and it tells you which of the three rows above you are actually in.
The monthly P&L lies by averaging. A SKU netting $0.50 per unit looks fine spread over a quarter — until one slow month of storage and one bid spike turn the whole line red. Judge per unit first, then per month. And do this before reordering: a below-break-even SKU that needs restocking needs repricing first, not replenishment.
The calculator solves the break-even price across the full 2026 fee structure, including referral tiers and dimensional weight:
Because sales volume does not fix a per-unit loss. If your price sits below the break-even price (where net profit equals zero after every fee), every order makes the hole bigger. The other two causes are returns running above your modeled rate — 20–30% in apparel — and peak storage quietly eating the cushion on slow stock from Oct 15 to Jan 14.