FEFO (First Expired, First Out)

FEFO (First Expired, First Out) is an inventory management method that prioritizes shipping or selling products with the earliest expiration date before those with later dates. Unlike FIFO (First In, First Out), which rotates inventory based on when it was received, FEFO focuses specifically on product shelf life. This distinction matters for any product that has an expiration date, best-by date, or use-by date, including food, beverages, supplements, cosmetics, pharmaceuticals, and certain industrial chemicals.

Why FEFO Exists

Products with expiration dates lose value as they approach their expiry. A bottle of vitamins with 18 months of remaining shelf life is worth full price. The same bottle with 2 months remaining may need to be discounted, donated, or destroyed. FEFO ensures that units closest to expiration move out of the warehouse first, maximizing the usable shelf life delivered to the customer and minimizing waste from expired inventory.

In regulated industries, FEFO is not optional. FDA regulations require that food and pharmaceutical distributors maintain lot traceability and ensure products reaching consumers have adequate remaining shelf life. Retailers impose their own shelf-life requirements, typically demanding that products arrive with at least 50% to 75% of their total shelf life remaining. A product with a 12-month shelf life must often arrive at the retail location with at least 6 to 9 months before expiration.

FEFO vs. FIFO

FIFO works well for non-perishable products where shelf life is not a concern. A warehouse storing electronics or clothing uses FIFO to rotate stock and prevent older inventory from sitting indefinitely. But FIFO can fail with expiration-dated products. Consider this scenario: a warehouse receives 500 units of a supplement on January 1 with a December 31 expiration date. On February 1, it receives 500 more units of the same supplement, but this batch has a June 30 expiration date (produced earlier, held longer by the supplier). Under FIFO, the January 1 batch ships first because it arrived first. But the February 1 batch actually expires sooner. FEFO corrects this by shipping the June 30 expiration batch first, regardless of when it arrived.

Implementing FEFO in a Warehouse

FEFO requires tracking expiration dates at the lot level within the warehouse management system (WMS). During receiving, workers scan or manually enter the expiration date for each lot. The WMS stores this information alongside the bin location and quantity. When a pick order is generated, the system directs the picker to the location containing the lot with the earliest expiration date, even if closer locations hold the same SKU with later dates.

This creates a more complex picking process compared to simple location-based picking. The picker may need to walk past one bin of the same product to reach a different bin where the earlier-expiring lot is stored. Warehouse layout and slotting strategies that group expiration-dated products in a dedicated zone can reduce this inefficiency.

FEFO in Amazon FBA

Amazon applies FEFO principles in its fulfillment centers for products with expiration dates. Sellers are required to label products with expiration dates in a specific format (MM-DD-YYYY or MM-YYYY) and provide expiration date information when creating shipments. Amazon will not accept products with fewer than 90 days of remaining shelf life at the time of receipt, and products that reach their expiration date while stored at an FBA facility are disposed of at the seller’s expense.

Sellers of perishable or expiration-dated products should manage their own inbound supply chain with FEFO awareness. Sending a large batch of product with only 4 months of remaining shelf life to FBA creates risk: if the product does not sell within the first month, Amazon’s 90-day cutoff starts compressing the window, and unsold units may be destroyed before they ever reach a customer.

Prep Center Role

Prep centers handling expiration-dated products should apply FEFO during their receiving and shipping processes. When multiple lots of the same SKU are in the prep center, the lot expiring soonest should be the first shipped to Amazon or to the end customer. Checking expiration dates during receiving also catches lots that are already too close to expiry to send to FBA, preventing wasted shipping costs on inventory that Amazon will reject or destroy shortly after arrival.