Backorder

A backorder is an order for a product that has been accepted by a seller or supplier but cannot be fulfilled immediately because the required inventory is currently unavailable.

Instead of canceling the order, the seller keeps the order open and fulfills it when additional inventory becomes available.

For example, a buyer orders 1,000 units of a product, but only 600 units are currently available. If the supplier accepts the order and agrees to provide the remaining 400 units after replenishment or production, those 400 units can be treated as backordered.

A backorder therefore represents committed demand that is waiting for future supply.

How Does a Backorder Work?

A typical backorder process begins when a customer places an order for a product that is not fully available. The seller checks whether additional inventory is expected and determines whether the order can remain open.

If the order is accepted, the unavailable quantity is recorded as a backorder. The seller then waits for replenishment, production, or another source of supply. Once the required products become available, the backordered quantity is fulfilled and shipped.

The basic flow is:

Customer Order → Inventory Shortage → Order Accepted → Backorder Created → Replenishment / Production → Order Fulfilled

The exact process varies by business and order-management system. Some businesses may allow partial fulfillment, while others may hold the entire order until all required products are available.

Why Do Backorders Occur?

The most common reason for a backorder is that demand exceeds currently available inventory. A product may sell faster than forecast, or multiple customers may place orders before the next replenishment arrives.

Backorders can also result from supply-side problems. Manufacturing delays, raw-material shortages, supplier capacity constraints, or longer-than-expected production lead times can delay the availability of new inventory.

Inventory planning decisions can contribute as well. If a buyer maintains low inventory levels, orders products in batches according to demand, or has a long replenishment cycle, available stock may be exhausted before the next supply arrives.

In some cases, the shortage is caused by inaccurate inventory records. The system may show inventory as available when the actual usable quantity is lower because of damaged goods, inventory discrepancies, reserved stock, or unrecorded movements.

Backorder vs. Stockout

A stockout and a backorder are closely related but describe different conditions.

A stockout occurs when available inventory is insufficient to satisfy current demand.

A backorder occurs when an order has been accepted but the required product cannot be supplied immediately and must wait for future inventory.

For example, a supplier has 500 units available and receives an order for 800 units. The supplier has a shortage of 300 units, which represents a stockout condition for that demand. If the supplier accepts the order and promises to provide the remaining 300 units later, those 300 units become a backorder.

Therefore:

Stockout = insufficient available inventory

Backorder = accepted order waiting for future supply

A stockout can lead to a backorder, but a stockout does not necessarily create one. A seller may instead reject, cancel, or lose the order.

Backorder vs. Out of Stock

Out of stock generally describes the current availability status of a product.

For example, an e-commerce product page may show “Out of Stock” when customers cannot purchase the item from current inventory.

A backorder is an order-level condition. The customer has placed an order and the seller has accepted it, but the item is not currently available for immediate fulfillment.

A product can therefore be out of stock while also having existing backorders.

For example:

• Available inventory: 0
• Existing customer orders: 500 units
• Expected replenishment: 1,000 units

The product is currently out of stock, while the 500 units already ordered can be recorded as backordered.

Backorder vs. Preorder

A preorder is generally an order placed before a product is available for sale or before its planned release.

A backorder, by contrast, normally occurs after a product is already available for sale but current inventory is insufficient to fulfill an accepted order.

For example, a new product scheduled for release next month may be offered for preorder before production is completed.

A popular existing product that sells out today but has new inventory scheduled for next week may instead be offered on backorder.

The distinction can vary by company terminology, but the key difference is generally whether the order is being placed before the product's initial availability or is waiting for replenishment of an existing product.

Backorder vs. Delayed Order

Not every delayed order is a backorder.

An order may be delayed because of:

• Shipping problems
• Documentation issues
• Payment processing
• Packaging delays
• Quality problems
• Transportation disruptions

A backorder specifically refers to a situation in which the required product is unavailable and the order is waiting for future supply.

Therefore, an order can be delayed without being backordered.

What Happens When an Order Is Backordered?

The seller typically needs to determine when the required inventory will become available and communicate the expected fulfillment timing.

Depending on the business model, the seller may:

• Keep the order open
• Ship available quantities first
• Wait until the complete order is available
• Allocate future inventory to existing orders
• Provide an estimated replenishment date
• Allow the customer to cancel or modify the order

The appropriate approach depends on the seller's commercial terms and customer requirements.

Partial Fulfillment and Backorders

A backorder does not always mean that the entire order must wait.

Suppose a buyer orders:

• Product A: 1,000 units
• Product B: 500 units

If Product A is available but Product B is not, the seller may ship Product A immediately and place Product B on backorder.

This is known as partial fulfillment.

Alternatively, the buyer and seller may agree to hold the complete order until all products are available.

The decision can depend on shipping costs, customer requirements, product characteristics, and the commercial agreement.

Backorders and Manufacturing Lead Time

For manufactured products, backorders are often closely connected to manufacturing lead time.

If a product is unavailable but a new production batch is already scheduled, the expected manufacturing lead time can provide a basis for estimating when the backordered quantity may become available.

For example, if a factory requires 30 days to manufacture a product and the next production run starts next week, the backordered units may not be available immediately even though the supplier has confirmed future production.

This is why a backorder estimate should distinguish between:

Inventory Availability → Production Lead Time → Fulfillment → Delivery

Manufacturing completion does not necessarily mean the product has already been delivered to the buyer.

Backorders and Inventory Planning

Backorders can provide useful information about the relationship between demand and inventory.

Repeated backorders may indicate that demand is consistently exceeding available supply, or that replenishment quantities and timing do not match actual purchasing requirements.

A buyer may therefore review:

• Historical demand
• Inventory turnover
• MOQ
• Reorder point
• Safety stock
• Manufacturing lead time
• Supplier capacity
• Replenishment frequency

However, simply increasing inventory is not always the appropriate response. Excess inventory can increase carrying costs and create additional inventory risk. The cause of the backorder should be understood before changing the purchasing strategy.

Backorder Example

Suppose an online retailer receives an order for 2,000 units of a product.

Current available inventory is 1,200 units, while another 1,000 units are expected from the next production run.

The retailer can immediately fulfill 1,200 units and leave 800 units waiting for future supply.

If the retailer accepts the full order and records the remaining 800 units as outstanding, those 800 units are backordered.

Once the next 1,000 units arrive, the retailer can allocate 800 units to the existing order and have 200 units remaining for other demand.

This example shows why inventory allocation and replenishment timing are important when managing backorders.

How Can Backorders Be Reduced?

Reducing backorders generally requires improving the relationship between demand, available inventory, and replenishment.

Businesses may review demand forecasts, reorder points, safety stock, supplier lead times, production schedules, and order quantities. Better inventory visibility can also help identify shortages before current stock is exhausted.

For manufacturing purchases, buyers may also need to consider whether the supplier has sufficient production capacity and whether the planned production schedule can support the required delivery date.

The appropriate solution depends on the reason the backorder occurred. A demand forecasting problem requires a different response from a supplier production delay or an inventory-record error.

Backorder Metrics

Businesses can measure backorders in several ways depending on their reporting system.

Common measures include:

Backordered Quantity: The number of units currently waiting for supply.

Backordered Orders: The number of customer orders containing one or more backordered items.

Backorder Rate: The proportion of orders or demand that cannot be fulfilled immediately and is placed on backorder.

Backorder Age: The amount of time a backordered order or quantity has been waiting for fulfillment.

Backorder Fill Time: The time between creation of the backorder and its eventual fulfillment.

Because companies can define these metrics differently, the measurement method should be clearly specified when comparing performance.

Frequently Asked Questions

What does backorder mean?

A backorder is an accepted customer order that cannot be fulfilled immediately because the required product is currently unavailable.

Is a backorder the same as out of stock?

No. Out of stock describes product availability, while a backorder describes an accepted order waiting for future supply.

Is a backorder the same as a stockout?

No. A stockout means available inventory is insufficient to meet demand. A backorder means an accepted order is waiting for future inventory. A stockout can result in a backorder.

Does a backorder mean the product is discontinued?

No. A backordered product is generally expected to become available again. A discontinued product is no longer being supplied or produced under the relevant product offering.

Can a backordered item be canceled?

It can be, depending on the seller's terms and the customer's rights under the applicable transaction.

Can backorders be partially fulfilled?

Yes. If part of an order is available, the available quantity may be shipped while the remaining quantity stays on backorder, if the seller's process allows partial fulfillment.

How long does a backorder take?

There is no universal backorder timeframe. It depends on when new inventory becomes available, which may be affected by manufacturing lead time, supplier capacity, replenishment schedules, and transportation.

How NewBuyingAgent Can Support Order and Replenishment Coordination

For buyers purchasing manufactured products from China, backorders can result from a mismatch between demand, available inventory, production schedules, and replenishment timing.

NewBuyingAgent works with manufacturing sources across product categories and can coordinate buyer requirements such as product specifications, order quantities, and purchasing schedules with factories.

For recurring orders, understanding MOQ, inventory turnover, manufacturing lead time, and order fulfillment can help buyers establish purchasing and replenishment schedules that better reflect actual demand.

Key Takeaway

A backorder is an accepted order that cannot be fulfilled immediately because the required product is unavailable and must wait for future supply.

A backorder is different from a stockout, out-of-stock status, and preorder. The central distinction is that a backorder represents existing, accepted demand waiting for inventory.

For manufactured products, backorders are often connected to demand levels, inventory planning, manufacturing lead time, replenishment schedules, and supplier capacity. Understanding these relationships helps buyers distinguish the cause of a delayed order and determine what inventory or supply information needs to be reviewed.

Partial Sources

[1] SAP, Backorder Processing and Order Fulfillment. SAP — Order Management and Fulfillment

[2] Oracle, Order Management and Inventory Management.  Oracle — Order Management

[3] IBM, Inventory Management.  IBM — Inventory Management