Backorder
Order that cannot be fulfilled immediately due to insufficient stock.
Definition
Backorders occur when demand exceeds available inventory, and the order is fulfilled once stock is replenished.
Overview of Backorder
A backorder is a customer order or order line for a product that cannot be fulfilled immediately because the item is currently out of stock or unavailable, but the order is retained and the item will be shipped when inventory becomes available rather than being canceled. Backorders represent a deferred fulfillment commitment — the seller accepts the order and the customer agrees to wait for future availability. They are distinct from a lost sale, where the customer abandons the purchase entirely due to unavailability. Backorder management requires clear communication with the customer about expected availability dates, proactive updates if those dates change, and a fulfillment process that prioritizes backordered units when replenishment arrives. In warehouse and 3PL operations, backorder management introduces complexity that standard in-stock fulfillment does not. The WMS or OMS must track which orders are on backorder, by SKU, and automatically allocate units against backordered orders when inbound receipts arrive — in the correct priority order, typically first-in, first-out by order date. When partial inventory arrives, the system must decide whether to fulfill a portion of the backorders or hold all units until the full quantity needed is available. Communication workflows must trigger customer notifications at order placement, when availability date changes, and when the item ships. For retailers and brands with vendor compliance requirements, shipments against long-aging backorders may require confirmation that the purchase order is still valid. WareMatch helps brands find 3PL providers with the OMS and WMS capabilities to manage backorder queues efficiently, ensuring that returning inventory is allocated and shipped against pending orders with minimal delay. Through the WareMatch marketplace, businesses can identify operators whose systems support automated backorder allocation, customer notification integration, and priority fulfillment for backordered units.
Role
Order that cannot be fulfilled immediately due to insufficient stock.
Focus
A backorder is a customer order or order line for a product that cannot be fulfilled immediately because the item is currently out of stock or unavailable, but the order is retained and the item will be shipped when inventory becomes available rather than being canceled. Backorders represent a deferred fulfillment commitment — the seller accepts the order and the customer agrees to wait for future availability. They are distinct from a lost sale, where the customer abandons the purchase entirely due to unavailability. Backorder management requires clear communication with the customer about expected availability dates, proactive updates if those dates change, and a fulfillment process that prioritizes backordered units when replenishment arrives. In warehouse and 3PL operations, backorder management introduces complexity that standard in-stock fulfillment does not. The WMS or OMS must track which orders are on backorder, by SKU, and automatically allocate units against backordered orders when inbound receipts arrive — in the correct priority order, typically first-in, first-out by order date. When partial inventory arrives, the system must decide whether to fulfill a portion of the backorders or hold all units until the full quantity needed is available. Communication workflows must trigger customer notifications at order placement, when availability date changes, and when the item ships. For retailers and brands with vendor compliance requirements, shipments against long-aging backorders may require confirmation that the purchase order is still valid. WareMatch helps brands find 3PL providers with the OMS and WMS capabilities to manage backorder queues efficiently, ensuring that returning inventory is allocated and shipped against pending orders with minimal delay. Through the WareMatch marketplace, businesses can identify operators whose systems support automated backorder allocation, customer notification integration, and priority fulfillment for backordered units.
Example
See the definition above for context.
Benefits
- Retains customer purchase intent and revenue that would be lost if out-of-stock products were not available to backorder.
- Enables accurate demand capture during stockout periods, providing data for replenishment quantity decisions.
- Allows brands to accept pre-orders on new products before inventory is received, building revenue pipeline in advance.
- Provides customers with a confirmed order and expected fulfillment date rather than a disappointing unavailability message.
- Enables WMS systems to pre-allocate incoming inventory against specific customer orders, accelerating post-receipt fulfillment.
- Supports proactive customer communication practices that maintain trust during inventory shortage periods.
FAQs
Q: How should a business communicate with customers about backorders?
A: Communication best practice involves three stages: at the point of order placement, clearly display the out-of-stock status and estimated availability date before the customer completes checkout. After the order is placed, send a confirmation email that explicitly states the backorder status and expected ship date. If the expected availability date changes, proactively notify the customer with the updated date and an option to cancel if the new date is unacceptable. When the item ships, notify immediately with tracking information. Transparency throughout the process significantly reduces customer frustration and chargeback rates.
Q: What is the difference between a backorder and a pre-order?
A: A backorder occurs when an item was previously in stock, has sold out, and will be replenished — the customer is ordering an item that has been sold before and will be again. A pre-order occurs before an item has ever been available, typically for a new product launch or an upcoming season collection. The inventory and fulfillment management considerations are similar, but the customer expectation and marketing context differ. Pre-orders often carry a longer and more uncertain wait time, while backorders typically have a more defined replenishment timeline.
Q: How does a 3PL handle backorder allocation when replenishment arrives?
A: When inbound replenishment is received, the WMS checks for any open backorder allocations against the received SKU and automatically assigns available units to pending orders in the defined priority sequence — typically by order date. The system generates pick tasks for backordered units as inventory is putaway, often prioritizing these tasks to get delayed orders out quickly. The OMS triggers customer notification emails when the backordered unit is allocated and then again when it ships. This automation is critical at high volumes where manual backorder management would be impractically labor-intensive.
Q: When is it better to cancel an order rather than maintain it as a backorder?
A: Cancellation is more appropriate than maintaining a backorder when the estimated availability date is uncertain or very long (more than four to six weeks for most consumer products), when the product is seasonal and the customer need is time-specific, when the supplier has confirmed the item is discontinued, or when the customer requests cancellation. For regulated products or custom-manufactured items, backorder management requires clear supplier-confirmed availability commitments before promising the customer a date. A backorder that chronically fails to be fulfilled damages customer trust more than a transparent cancellation.