How Does Amazon Payments Calculate the Reserve Amount?
For the first six months with new Business and Seller Accounts, you will be placed in the Tier I Reserve. The Tier I Reserve amount is the sum of all unresolved transaction disputes (that is, chargebacks and claims) and the trailing 14 days of sales activity.
After six months of active selling or conducting payments using our services, and if you have completed more than 100 orders with us, you may be upgraded to the Tier II Reserve. The applicable reserve amount for Tier II Reserve merchants is either the merchant's Order Defect Rate multiplied by their trailing 30 days of sales or the total amount of unresolved disputes, whichever is higher.
The Order Defect Rate is defined as the number of orders with a defect divided by the number of orders in the time period under review. This defect rate is represented as a percentage. An order has a defect if we have received negative feedback, an A-to-z Guarantee claim, or a service credit card chargeback on that order. An order can only be "defective" once. Having negative feedback and a claim on the same