What is a backorder and how to manage it

An order goes through, the confirmation lands, and then a second notice arrives: the item is backordered and will ship later. For a buyer with a team or a customer already waiting, that gap between “ordered” and “in hand” is where the day gets complicated.

The frustrating part is how little of it sits in your control. You don’t set the seller’s stock levels, yet you’re the one managing expectations without a firm delivery date, fielding the follow-up questions, and deciding whether to wait or find another source.

Backorders are a normal part of buying, and they’re often more manageable than they first look. This guide covers what a backorder actually is, why it happens, how it differs from being out of stock, and the practices that can soften its impact. It starts with the definition.

What is a backorder?

A backorder is an order for an item that’s temporarily out of stock but still accepted by the seller, to be fulfilled once supply returns. The order stays open rather than being cancelled, and it ships when inventory is replenished.

A simple example makes it concrete: A facilities buyer orders 50 units of a cleaning supply where 30 are in stock and ship now, and the remaining 20 are placed on backorder for a later date. The buyer keeps their place in line for those 20 units instead of starting over.

The key signal is that demand has outpaced available supply. A backorder tells you an item is still coming, which is a different situation from an order that can’t be placed at all.

Backorder vs. out of stock

The practical difference is whether you can still buy the item right now. A backordered item can be ordered today and ships once stock returns, while an out-of-stock item can’t be ordered until the seller restocks it.

Both point to a supply shortfall, but they leave the buyer in different positions:

• Backorder: The purchase goes through and the seller commits to fulfilling it later, often with an estimated ship date.

• Out of stock: The listing is unavailable for purchase, so a buyer has to wait for a restock or look elsewhere.

Backlog is a third term readers often mix in. A backlog is the broader pile of unfulfilled orders an organization is working through, while a backorder is the specific line that’s waiting on out-of-stock inventory.

What causes backorders?

Backorders usually happen when demand outpaces supply, and a handful of causes tend to be behind them. Understanding which one is at play can help a buyer judge how long a wait might last.

• Demand spikes: A sudden jump in orders, from a seasonal surge or an unexpected event, can clear available stock faster than a seller can replenish it.

• Supplier or production delays: When a seller’s own upstream supply slips, the shortage can pass downstream to the buyer as a backorder.

• Forecasting gaps: When projected demand misses actual demand, stock levels may be set too low to cover real orders.

• Lean stock strategies: Some sellers deliberately hold minimal inventory to control carrying costs, which can leave less buffer when orders climb.

Broader supply conditions can compound these causes. Periods of disruption tend to make shortages more frequent, so a buyer may see backorders cluster when the wider market is under strain.

How backorders affect your business

Backorders can delay fulfillment, strain relationships, and add cost, and the effects often ripple beyond the single late line. A clear view of the downstream impact helps a buyer decide how hard to work around a given shortage.

Three effects tend to show up in order:

• Delivery timelines move first. A backordered item can hold up a project, a production run, or a customer order that depends on it, which may push a buyer toward expedited shipping or a costlier substitute.

• Relationships feel the pressure next. An internal team or an end customer waiting on the item often looks to the buyer for answers.

• Financial costs accumulate. Expediting fees, extra handling, and the working capital tied to partial orders all accumulate in the background.

None of these is a given on every backorder, but together they explain why the practice matters.

Reducing the impact of backorders

Organizations rarely remove backorders entirely, but several practices can reduce how often they bite and how much they cost when they do. Each one trades a little effort or expense now for more predictable supply later.

• Buffer stock on critical items: Holding a small reserve of the items an operation can’t run without gives a cushion when a seller runs short. It ties up some capital, so it tends to be reserved for the highest-stakes items.

• Demand forecasting: Reviewing past usage to project future demand can help a buyer order ahead of a predictable spike rather than reacting to it. Approaches to demand forecasting vary by how steady demand is.

• More than one source: Spreading purchases across more than one seller reduces reliance on any single one, which can matter when supply risk is concentrated. It sits alongside broader procurement risk management practices.

• Clear timelines: Communicating realistic ship dates to the teams waiting on an item won’t speed delivery, but it can reduce the follow-up churn a backorder creates.

These practices work together with day-to-day inventory management techniques rather than replacing them, and the aim is to soften the impact of a shortage rather than remove the risk.

How Amazon Business can help

Amazon Business can help reduce the sting of a backorder helps most by widening the options a buyer has when an item runs short. Access to a broad base of business sellers means that when one source is out, comparable items may still be available from another, which can help reduce reliance on a single seller.

For items an operation restocks routinely, Amazon Business Restock is a managed program that can help keep critical items stocked at work sites where it’s available, with the service set up through an Amazon Business Account Executive. When demand climbs, bulk and wholesale buying can help cover larger quantities from business sellers in a single order. And for recurring needs, business-only selection and reordering can make it easier to reorder the same items without rebuilding the order each time. None of these removes a shortage at the source, but each can give a buyer more room to keep orders moving.

Stay ahead of backorders

Backorders are a normal supply signal, not a failure, and buffers, forecasting, and flexible sourcing can help manage them rather than leaving a buyer to react each time. Organizations that manage them well often treat them as a planning input, watching which items backorder most often and building a little more resilience around those.

A practical starting point is identifying where a second source may be worth having before a shortage forces the question. To see how a broad base of business sellers could support more reliable buying for your organization, contact Amazon Business to learn more.