Overage Fees in Amazon's Seller Central

Overage fees will apply if a seller's on hand inventory in Amazon's fulfillment centers exceeds their capacity limit all right not including open shipments overage fees are calculated based on the highest estimator or confirm limit we've provided for the given period now this to me I mean there's always been some kind of overage fee you know for storage fee but this almost seems new to me so they kind of slid this one under the radar.