We know that one of the most important drivers of buyer confidence is that their purchases arrive when expected. For this reason, we measure seller on-time shipping performance using both seller handling time and the carrier's delivery timeframe.
We work closely with our carrier partners to reflect their delivery promise. Ahead of the holidays and as a result of this work, effective September 1, 2016, we are updating the estimated delivery date for seller on-time shipping performance for USPS First-Class Mail® to three days and USPS Priority Mail Express® to one day.
If you use these services and are shipping within your stated handling time, you should not be impacted by this change. Shipping outside your stated handling time increases the risk that your item may arrive late, which can impact your on-time shipping and overall selling performance.
As always, you can check your seller dashboard anytime to view your current late shipment rate, download your late shipment report, and use them to make any necessary adjustments to your selling practices. For more details on how handling time works, how it’s calculated, and how to set it, be sure to visit our handling time page.
To learn more and ask questions about this update, please visit our community board.