Managing Out-of-Stock Products: Best Practices to Save Sales

A shopper finds the product they want, clicks through to the product page, and discovers it is out of stock. They might wait for a restock, look for an alternative, or leave the site and buy from a competitor instead. For the retailer, that single stockout can also mean lost ad spend, missed sales, weaker product visibility, and extra work for merchandising teams.

How a brand handles that moment matters. Keeping shoppers engaged, capturing their interest for later, and making sure available products are surfaced can turn a potential lost sale into another opportunity.

In this blog, we’ll look at what causes products to go out of stock, the best ways to manage them, and how AI merchandising can automate the process as your catalog grows.

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What You Need to Know About Out-of-Stock Products in E-commerce

For example, a popular skincare serum sells out on a Friday afternoon, but a new shipment is already on the way from the warehouse, so the page stays live with a restock notice.

This is very different from a permanently discontinued product. Discontinued means the merchant has decided the item will never be replenished and the SKU should be retired. Treating an out-of-stock item correctly keeps your SEO equity intact, collects back-in-stock signups, and suggests alternatives, whereas a discontinued page should be redirected or marked clearly as gone so shoppers stop expecting it back.

An out-of-stock product can create problems across multiple parts of the business:

• Customers may be frustrated when they cannot buy the product they want and may leave for a competitor.
• Merchandising teams may need to quickly adjust collection pages, search results, and product placements when a popular product sells out.
• Operations teams may face pressure to expedite shipments, find alternative suppliers, or manage delays when demand exceeds available stock.
• Marketing teams can waste ad spend if campaigns continue sending shoppers to products they can no longer purchase.

» Learn how to ensure ideal communication around supply chain issues

Causes of Out-of-Stock Products

Several factors can cause products to go out of stock, from unexpected demand to inventory management issues. The most common causes include:

• Inaccurate demand forecasting happens when a product suddenly goes viral or gains seasonal demand that historical data did not predict. This can quickly lead to unexpected stockouts.
• Multi-channel inventory sync failures occur when inventory does not update across Shopify, marketplaces, and physical stores in real time. This can leave products listed as available after they have already sold out.
• Supplier and lead-time delays can disrupt stock levels, especially for brands sourcing products overseas. Customs issues, factory slowdowns, or shipping delays can leave bestsellers unavailable for weeks.
• Poor SKU-level reorder points happen when merchants use the same reorder threshold across products. Fast-moving SKUs can sell out while slower products remain overstocked.

» Find out how to use AI for inventory forecasting

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5 Best Practices for Managing Out-of-Stock Products

When a product goes out of stock, the goal is not simply to tell shoppers it is unavailable. The best approach keeps the product discoverable, gives shoppers a next step, and captures useful demand data for when inventory returns.

1. Keep Product Pages Live and Useful

Avoid deleting an out-of-stock product page or sending shoppers to a 404 page. Keep the page live, clearly show that the product is unavailable, and provide relevant alternatives or restock information. This helps preserve the SEO value the page has built while giving shoppers another path to purchase.

» Have you tried using search and discovery to boost sales? Here's how to do it.

2. Capture Demand With Back-in-Stock Alerts

Give shoppers the option to receive an email or notification when a product becomes available again. A shopper who signs up has already demonstrated strong purchase intent, making them valuable to re-engage when inventory returns.

For example, a retailer selling running shoes could let customers select their size and receive an alert when that specific size is restocked.

3. Recommend Relevant Alternatives

When the original product is unavailable, show comparable products that meet a similar need rather than generic recommendations. This creates a cross-selling opportunity by helping shoppers discover another product they may be happy to purchase instead. This is particularly useful for larger catalogs where shoppers have more alternatives to choose from.

For example, if a black leather handbag is sold out, the store could recommend similar handbags in the same style and price range. This keeps the shopper engaged while creating an opportunity to recover the lost sale.

» See the full breakdown of  cross-selling vs. upselling and which is more effective .

4. Keep Inventory and Advertising in Sync

Inventory should update consistently across your website, marketplaces, physical stores, and advertising platforms. When a product sells out, paid campaigns should be paused or redirected to available alternatives.

This is especially important for larger, multi-channel retailers, where inventory delays can lead to overselling, wasted ad spend, and frustrated customers.

» Updating your catalog can help improve product discovery in search results

5. Be Transparent About Restocking

When you have a reliable estimate, give shoppers a clear expected restock date instead of leaving them guessing. Combined with a back-in-stock option, this gives customers a reason to stay engaged with the product.

» Customers might be leaving your website for other reasons: Find out how to make them stay

How Pre-Orders, Wishlists, and Restock Dates Preserve Purchase Intent

Stockouts create a gap between when a customer wants a product and when they can actually buy it. Pre-orders, wishlists, and restock information help bridge that gap by giving shoppers a reason to stay engaged rather than moving on to another retailer.

• Wishlists capture early interest. They give shoppers a way to save a product they want but are not ready to purchase immediately. This can be particularly useful for products that frequently sell out or have longer purchase cycles.
• Back-in-stock alerts maintain active interest. Unlike a wishlist, an alert creates a direct opportunity to bring the shopper back when inventory becomes available. The customer has already identified the specific product they want, making this a high-intent audience.
• Pre-orders create stronger purchase commitment. Rather than simply waiting for inventory, customers can place an order before the product is available. This is particularly useful for limited releases, product launches, and products with predictable replenishment cycles.

» Struggling with no-results pages? Read our blog on managing out-of-stock products and no-search-results pages

Automating Out-of-Stock Management With AI Merchandising

Manual out-of-stock management becomes difficult to maintain as catalog grow and inventory changes across multiple channels. Once retailers have hundreds of SKUs, keeping collections, search results, and recommendations aligned with live inventory can quickly become a full-time task.

The first thing to suffer is often merchandising accuracy. A product may be featured while it’s in stock, but stay prominently displayed even after it sells out simply because no one has updated it. Auburn University’s RFID Lab reports that U.S. retail inventory accuracy averages around 65%, showing how common inventory discrepancies can be even before manual update delays are considered.

Automation removes this gap by connecting inventory changes directly to merchandising decisions. Real-time syncing can reduce overselling, keep product discovery more accurate, and eliminate repetitive manual updates.

This shifts out-of-stock management from a manual maintenance task to an automated part of the merchandising strategy. Merchandisers can set the rules around stock levels and product priorities, while the system handles the constant changes happening across the catalog.

» Want to give your customers a better experience? Give AI a try

Where Merchant Judgment Still Matters

AI can manage routine inventory decisions at scale, but merchants still need control over exceptions where brand strategy, campaigns, or customer demand matter more than stock levels alone.

• Seasonal bestsellers: A product running low may still need to stay highly visible because it is a key seasonal or promotional item.
• Product launches: A new product with limited initial inventory may need to remain prominently featured even when an inventory rule would normally demote it.
• Campaign priorities: A merchant may want to prioritize specific products during a holiday campaign, even if other products have stronger inventory levels.
• Strategic exceptions: Merchandisers may need to override automated rules when they know something the inventory data cannot, such as an incoming shipment, planned promotion, or important brand partnership.

The goal is not to replace merchandising judgment. It is to automate routine decisions while giving merchants control over the exceptions that require context.

» Make sure you understand supply and demand in e-commerce

Turn Stockouts Into Smarter Merchandising

Out-of-stock products don’t have to be a dead end for shoppers or a manual burden for merchandising teams. With the right approach, retailers can keep customers engaged and get more value from existing traffic.

As catalogs and sales channels grow, automation becomes increasingly important. Fast Simon helps retailers connect inventory signals with merchandising decisions, allowing available products to be prioritized while low-stock and unavailable products are dynamically adjusted. This gives merchandising teams more control over their strategy while reducing the repetitive work of keeping product discovery aligned with inventory.

» Improve your inventory management. Schedule a demo with Fast Simon