eBay’s defect rate is deliberately narrow: it counts exactly two events, transactions you cancel because the item is not there to ship, and buyer cases that close without you resolving them. Not negative feedback, not returns, not late shipments (tracked separately), just the two outcomes eBay treats as broken promises. That narrowness is good news operationally, because both events have known causes and preventable sources.
The two defects, precisely
1. Seller-caused cancellation. You cancel with “out of stock” or “sold to someone else” as the reason, or fail to fulfill. This is the oversell defect: the listing said available, a buyer paid, and the shelf disagreed, the multichannel failure mode in its eBay uniform. According to IHL Group’s inventory distortion research, global retail losses from inventory distortion hit $1.7 trillion in 2024, with out-of-stocks driving $1.2 trillion of that. At the seller level, a single oversell typically runs $1,500 to $3,000 in refund processing, replacement shipping, and customer-service overhead, plus the lifetime-value hit from a buyer who probably won’t come back.
2. Case closed without seller resolution. A buyer opens an item-not-received or not-as-described case, escalates to eBay, and eBay steps in and decides it, or refunds without your action. The defect is not the case existing; it is the case ending without you handling it.
Thresholds and the evaluation clock
The published bars have been stable for years: defect rate at or under 2% (and cases closed without resolution at or under 0.3%) keeps you Above Standard; 0.5% is the Top Rated bar, alongside its late-shipment and tracking requirements, the full metrics picture covers how feedback sits beside these.
Evaluations run monthly (the 20th), over a 3-month window if you had 400 or more transactions in it, otherwise 12 months. The small-seller implication is brutal arithmetic: at 100 transactions a year, two defects put you at 2%, the edge of Below Standard. Low volume means zero tolerance in practice.
What Below Standard costs: search placement drops sharply, selling limits tighten, and eBay applies a published surcharge to final value fees for Below Standard sellers, you pay more per sale to be seen less. The demotion compounds: less visibility means fewer sales means each remaining defect weighs more in the percentage.
Prevention is operations, not appeals
Kill the cancellation defect at the stock layer. Every seller-caused cancellation traces to a listing that overstated availability: a sale on another channel that never propagated, a stale quantity, a miscount. Real-time sync across channels, the eBay-specific setup, plus the out-of-stock option for zero-quantity listings, removes the entire category. Sellers running one synced pool simply stop generating this defect.
Kill the case defect with response discipline. Cases escalate when buyers feel unheard: answer within 24 hours, resolve inside the case timeline, and treat every open case as a deadline item. The returns process handled promptly never becomes a closed-without-resolution defect, eBay only steps in where sellers step back.
Appeal the ones that qualify. eBay removes defects in published circumstances: buyer at fault or abusive, carrier delay with valid tracking, eBay-caused issues. Appeals live in Seller Hub; evidence (tracking scans, messages) decides them. Appeals are the exception path, though, a seller relying on appeals has an operations gap.
Common questions
Do returns count as defects?
No. A normal return, even not-as-described, is not a defect unless the case escalates and closes without your resolution. Handle it and it stays a return.
Does negative feedback affect the defect rate?
No, separate systems. Feedback affects your public percentage and buyer trust, removal has its own rules; defects affect seller level. Both trace to the same operational roots.
I cancelled because the buyer asked - defect?
Buyer-requested cancellations are not seller defects when recorded correctly: use the buyer-requested reason, not out-of-stock. Reason codes are the record; pick the true one.
How do I see my current rate?
Seller Hub’s Performance tab shows the live number, the window, and each counted transaction, worth a monthly look on the same cadence as the rest of your metrics.
Zero stock defects by design
Live quantity sync across every channel means eBay never sells what you do not have, the cancellation defect engineered away, from $49/month with unlimited orders. See pricing.