An aged inventory surcharge applies to units that have been stored in a fulfillment center for 271 to 365 days. Amazon will continue to charge the aged inventory surcharge for units that have been in a fulfillment center for more than 365 days. Aged inventory surcharges are assessed using an inventory snapshot on the 15th day of each month and is in addition to the monthly inventory storage fee. For more information, go to Aged inventory surcharge.