Backorder
An order a customer places for an item that's currently out of stock — to be fulfilled when stock arrives.
By Oana Bradulet
A backorder is an order a customer places for an item that you don't currently have in stock, with the understanding that you'll ship it once new stock arrives. Backordered means the item is in that state right now — sold, but not yet shipped.
It's the middle ground between "in stock and shipping today" and "we don't sell this anymore." The item is still part of your range, more is on the way, and the customer is willing to wait.
For consumer brands, the backorder is one of the most important — and most overlooked — commercial mechanics in the whole operation. It's how you sell stock you don't have without losing the customer to a competitor — provided you handle it well. And it's how you turn a stockout into useful demand signal instead of just a lost sale.
Backorder vs preorder vs out-of-stock
Three states that get confused constantly. Different commitments, different customer expectations.
| Product exists? | Accepting orders? | Customer expectation | Typical lead time | Operational risk | |
|---|---|---|---|---|---|
| Backorder | Yes (already on sale) | Yes | "I know it's late, but it's coming" | 2–10 weeks | Trust loss if dates slip |
| Preorder | No (not yet launched) | Yes | "I'm getting early access" | Weeks to months | Launch slippage, no refund flexibility |
| Out of stock | Yes | No | "I'll come back later or buy elsewhere" | Until next PO arrives | Lost sale to competitor |
A backorder customer is patient because they think the system is functioning. A preorder customer is excited because they're getting access early. An out-of-stock SKU customer is gone — you've decided not to ask them to wait. Pretending an out-of-stock SKU is a backorder when you have no incoming PO is a refund-and-apology email waiting to happen.
Common causes of backorders
A SKU goes on backorder for one of a small set of reasons. Knowing which is the difference between a one-off operational fix and a structural planning problem.
- Forecast under-shoot. Demand outpaced what the buyer expected; the next PO was sized for last month's run rate, not this month's surge.
- Supplier delay. The PO is in the system but the supplier slipped — production line issues, raw material shortages, or freight delays.
- Multi-channel overselling. Inventory shown as available across Shopify, Amazon, and wholesale simultaneously without a unified ATP layer; same units sold twice.
- MOQ shortfall. Reorder triggered, but the supplier's MOQ pushed receipt later than the trigger needed.
- Promotional surprise. A flash sale or marketing push that ops didn't see coming. The forecast was right; the marketing wasn't communicated.
- Returns / quality hold. Stock is physically there but quarantined for QC or sitting in the returns queue. The system shows it; ops can't ship it.
Most brands track which of these caused each backorder. Without that tagging, every backorder looks like supplier slippage even when it's actually a demand-signal failure.
Intentional backordering — when it's the strategy
Sometimes a brand backorders deliberately. Three patterns:
- Limited drops and exclusivity. Streetwear and luxury brands run waitlists where the wait is the point. Scarcity is the marketing.
- Made-to-order and customised goods. Furniture, custom apparel, prescription products. The order triggers production; backorder is the default state.
- Capital-light launches. A small brand validates demand by accepting backorders before placing the supplier order. Pre-orders and backorders blur here.
The common thread: the customer expects the wait. Don't apply the language of accidental backorders to a deliberately-paced one — and don't apply the language of pre-orders to a real stockout you're hoping to recover from.
Why backorders matter commercially
Run well, the backorder is one of the highest-leverage tools you have:
- You capture demand you'd otherwise lose. A backordered sale is a sale you'd have lost to a competitor with stock. As long as the customer doesn't churn, the revenue is yours.
- You learn what to reorder. Backorder volume is the cleanest possible demand signal — these are people who've already committed money. If a SKU is backordered with a queue of 200 customers, your next PO needs to be bigger.
- You smooth cash flow. Cash is in the door before stock has been paid for. For brands with long supplier lead times, this is real working capital.
Run badly, the backorder is one of the fastest ways to destroy trust:
- Optimistic ship dates. "Ships in 2 weeks" turning into 6 weeks. The customer remembers.
- No proactive comms. The customer hears nothing for 4 weeks, refunds, posts a bad review, and never buys again.
- Backordering things you can't actually replenish. Discontinued SKU, abandoned supplier, slow PO — but the website still says "ships in 3 weeks." Refund-and-apologise becomes the operational default.
How backorders connect to planning
A healthy operation tracks the backorder queue as a leading indicator of demand. When the queue grows faster than incoming stock, the next reorder point needs to bring in more — and probably sooner. Most brands miss this because the queue lives in the e-commerce platform, the PO lives in the ERP, and nobody's stitching the two together.
Customer comms — the three touchpoints that decide trust
A backordered customer is not yet a refund. Whether they stay or churn depends almost entirely on three messages:
- Order confirmation (immediate). Tell them clearly: "Your item is on backorder. We expect to ship around [date with built-in buffer]. You'll get an update before then." No corporate-speak, no buried disclaimer.
- Status update mid-wait. A week before the quoted date, send a real update — even (especially) if the date is slipping. "Stock is now expected [new date]. Here's why. You can wait, switch to [alternative SKU], or cancel for a full refund."
- Ship notification. When the order ships, lean into the wait. "Thanks for your patience. Tracking attached. If anything's off when it arrives, we want to know."
Brands that get all three right keep backordered customers; brands that get any of them wrong train customers to never wait again.
Common mistakes
- →Treating backorder as the same as out-of-stock — they have different customer expectations and require different copy.
- →Promising ship dates the supply chain can't actually deliver. Optimistic comms drive chargebacks and bad reviews.
- →Charging customers on backorder without making the policy explicit on the product page.
- →Letting backorder queues grow without flagging them to the buyer — the queue is the cleanest demand signal you have.
How Lumina handles backorders for scaling brands
Lumina takes your backorders into account when projecting forward — drawing stock down at the right fulfilment dates, so the projection is accurate. You can also quantify the value of your backorder book, watch it come down over time, and understand the revenue and customer-experience impact.