The Late Shipment Rate is the number of seller-fulfilled orders with a ship confirmation that is completed after the expected ship date divided by the number of seller-fulfilled orders in the relevant time period.
It's important to confirm the shipment of orders by the expected ship date so that customers can see the status of their shipped orders online. Orders that are ship confirmed late may lead to increased claims, negative feedback and/or customer contacts and negatively impact customer experience.
You should work toward achieving and maintaining a Late Shipment Rate of less than 4%.
To see your Late Shipment rate, on the Performance menu, select Account Health and then click the Performance Metrics tab.