Ecommerce Inventory Management: Best Practices & Challenges

Ecommerce inventory management is the process of tracking and organizing stock levels across sales channels and locations. The goal is to have the right products available at the right time without tying up unnecessary capital.

According to IHL Group, inventory distortion—the gap between recorded and available retail stock—costs global retailers $1.73 trillion annually. This includes about $1.2 trillion from stockouts and $572 billion from overstock. 

Here, learn how ecommerce inventory management works, review common challenges, and discover strategies for managing stock across locations and sales channels.

What is ecommerce inventory management?

Ecommerce inventory management is the end-to-end operational cycle of getting products from suppliers to customers. It covers sourcing, receiving, storing, tracking, allocating, selling, fulfilling, and processing returns.

Before ecommerce, inventory management focused on visibility: knowing what you had, where it was, and when to reorder. Ecommerce adds coordination challenges:

• If stock’s in the wrong warehouse, it can’t help a customer who needs same-day fulfillment.
• If inventory is reserved for a wholesale order, you can’t also sell it on your ecommerce store. 
• Returns processed in one channel must flow back to available stock across all other channels. 

The goal is to have the right inventory in the right location at the right time, without carrying more than you need to get there.

TIP: Shopify unifies inventory data across online stores, marketplaces, social storefronts, retail locations, warehouses, and 3PLs without middleware or custom integrations. It includes multilocation inventory syncing and a centralized admin so you can keep your stock levels aligned across channels.

Why ecommerce inventory management matters

Poor inventory management often shows up as operational issues rather than being recognized as a strategic problem. 

It manifests as stockouts during peak campaigns, warehouses full of slow-moving products that tie up cash, customer service queues full of “where’s my order” tickets, or returns backlogs without clear owners. 

Ecommerce inventory management impacts growth, returns, and operating costs because:

• Ecommerce is growing. US ecommerce sales were estimated at $1.23 billion in 2025, representing 16.4% of total retail sales, and up 5.4% since the previous year. The operational complexity of managing inventory across more channels, locations, and customer expectations will grow in tandem.
• Returns are rising. The National Retail Federation (NRF) projected $849.9 billion in total retail returns in 2025, with 19.3% of online purchases returned. Without a reverse logistics process in place, retailers can end up holding stock that physically exists but can’t be sold.
• Inventory can drive growth. Unified, accurate inventory data is a prerequisite for alternative fulfillment options like warehouse shipping, store-based fulfillment, and buy online, pickup in-store (BOPIS). Parachute, for example, uses Shopify’s unified inventory data model to offer BOPIS for roughly 3,500 orders every year.
• Reliable inventory management can cut costs. Mejuri treats its London store as a fulfillment center for UK orders. This move, powered by unified ecommerce inventory data, dropped lead times from around seven to nine days to just one or two. It also cut monthly shipping costs by more than $100,000.

Common ecommerce inventory management challenges

“[Inventory] is not easy,” says Amit Mahtani, owner of Bagels on Greene. “We have days where it’ll start raining in the middle of the day, and we’ll have 20 dozen bagels left over. That’s the way it rolls. It’s been 19 years in this business. It’s something that you just have to try and do your best at.”

Poor inventory management tends to appear in these areas:

Multilocation stock visibility gaps

As brands add retail stores, 3PLs, and regional fulfillment centers, stock gets spread across more locations, which can make it harder to see an accurate count. 

Mizzen+Main addressed this with Shopify POS. Shopify’s ship-to-customer feature allows real-time inventory tracking across locations, so store staff can ship items directly to customers when their sizes aren’t available in-store.

“With our ability to only carry a select few sizes in the store, I would say about 20% of our weekly transactions happen through the ship-to-customer feature,” says district manager Trey Pritchard. “Shopify POS makes it very simple.”

Disconnected systems

The average retailer uses between seven and 10 systems to manage their business. But when each system holds its own version of inventory data, it can be challenging to get an accurate overview of what you have, where it is, and what’s available to sell.

Allbirds experienced this first-hand. As Micah Nelson, former director of product management, says: “At the end of each season, we would regularly pack up any slow-moving or out-of-season merchandise and ship it back to our warehouse, which was an inefficient use of time and money.”

Allbirds turned to Shopify for the ship-from-store feature on Shopify POS. Now, Allbirds’ global network of 31 retail stores can fulfill omnichannel product demand. As a result, they’ve reduced shipping and labor costs for end-of-season returns heading back to the warehouse.

“Stores love it, since over 50% of the product we ship from the store is generally slower-moving inventory, which offers them back that space so they can sell more,” says Micah.

Manual purchase order and reorder workflows

By the time a staffer manually creates a purchase order (PO)—emailing a supplier and updating a tracker by hand whenever they catch a low-stock situation—it may already be a stockout.

In a survey of more than 1,000 Shopify POS users, respondents reported that Shopify’s unified data saves them an average of 10 hours per month on inventory management. 

Cozykids, for example, integrates its POS with Shopify Flow to:

• Send automated notifications when product inventory drops below a predetermined stock level
• Show and hide products on the website based on inventory levels
• Alert subscribers to major sales events

“Usual stock management requires human involvement, but by using Shopify POS and setting up Flow, we have now shaved a huge amount of time and eliminated human error,” says the brand’s former creative director, Panos Voulgaris. “When dealing with a catalog of 6,000 to 7,000 products, that’s incredibly helpful. Flow makes it easy.”

How ecommerce inventory management works

A typical ecommerce inventory management sequence includes:

Forecasting demand

Demand forecasting helps you strike a balance between overstocking (overestimating customer demand) and stockouts (underestimating it). 

“The more you know about your demand, the less uncertain you are about demand,” says Javad Nasiry, associate professor at McGill University’s Desautels Faculty of Management. “That means you can manage your inventory better and reduce inventory levels in your warehouses, because keeping inventory is costly.”

AI demand forecasting tools estimate demand by drawing on:

• Historical sales data
• Seasonality
• Promotion calendars
• Market dynamics 
• Customer behavior patterns 
• Supplier lead times
• Returns patterns

Bestseller status alone isn’t enough to predict demand. Velocity, sell-through rate, and margin all matter: a slow-moving, high-margin product may warrant more stock than a fast-moving, low-margin one that generates frequent returns.

TIP: Shopify’s inventory reports consolidate forecasting data from online and in-store locations into a single admin. They show daily sales quantities, sell-through rates, and channel-level performance.

Sidekick, Shopify’s built-in AI assistant, can pull on this data to help with inventory forecasting. “We used Sidekick to plan inventory production based on last year’s Q4 sales velocity,” says Jack Oswald, founder of Cancha. “It was incredibly useful for work that otherwise would have taken hours.”

Setting stock policies

Stock policies turn forecasting intent into operational rules. To set yours, consider:

• Reorder points. The inventory level that triggers a new purchase order, calculated from average daily sales multiplied by supplier lead time, plus safety stock. Reorder points tell you when you need to act to avoid running out.
• Safety stock. A buffer held above the reorder point to absorb demand spikes or supplier delays. Consider daily usage and supplier lead times to calculate a safety stock figure. 
• Economic order quantities (EOQ). Balance order costs against holding costs to find the most efficient order size. 
• Minimum order quantities (MOQs). Supplier-imposed minimums that may force you to hold more stock than your ideal target.

Receiving and storing inventory

Incorrectly recording goods in your inventory system creates an immediate discrepancy between your system count and your actual inventory. Whether the error is in the quantity, variants, location tags, barcode scans, or something else, every downstream decision that relies on that data inherits the mistake.

Refine your receiving inventory process to cover:

• Stock-keeping unit (SKU) discipline. Every product variant needs a unique, consistent identifier that matches across your purchase orders, inventory management system (IMS), and sales channels. 
• Barcode scanning. Scanning a barcode at the point of receipt creates a verifiable record so you know the unit was physically handled, checked, and logged. 
• Location tagging. Assign stock to a specific location upon receipt. Stock that arrives but isn’t location-tagged correctly will appear in aggregate inventory counts but can’t be routed to the correct fulfillment point.
• Accuracy checks. Verify the items you receive against PO quantities. Log short shipments, damaged units, and incorrect variants as inventory adjustments so they don’t absorb into system counts.

Syncing inventory across channels and locations

If inventory isn’t synchronized in real time across your online store, marketplaces, social commerce, and POS, it’s possible to sell the same unit twice. In a survey of more than 1,000 shoppers, around two-thirds said they’re less likely to trust a business after experiencing overselling. 

A unified commerce system supports flexible fulfillment features such as:

• Availability promises
• Intelligent order routing
• Ship to customer
• Buy online, pickup in-store
• Endless aisles

Canadian luggage retailer Bentley uses this Shopify feature to manage ecommerce inventory and sync data with more than 125 retail locations. 

Before migrating to Shopify, Bentley had partially implemented BOPIS and ship-from-store, but the features weren’t functioning effectively. The store also lacked real-time inventory visibility across its network.

Fully implementing Shopify gave the brand a single source of truth for its inventory data. Bentley recorded 129% year-over-year revenue growth, a 74% increase in online sales, and 17% growth in POS transactions. 

Counting, auditing, and reconciling

Inventory records can drift over time due to receiving errors, mispicks, unlogged damage, and returns that don’t restock cleanly. Regular cycle counting helps close the gap.

To ensure accuracy between system counts and physical stock: 

• Run cycle counts continuously. Count a rotating subset of SKUs each day or week rather than shutting down operations for a full count. 
• Run spot checks after high-risk events. Peak sale periods, large inbound shipments, returns surges, and stock transfers all introduce the risk of error. A targeted spot check on affected SKUs immediately after the event can catch discrepancies before they propagate into reorder logic.
• Investigate variances. Shopify’s inventory adjustment logs and location inventory reports let you track variances over time and identify which SKUs or locations generate the most, so you know where to start improving your process.

Ecommerce inventory management systems: How Shopify helps

Shopify’s native inventory management software gives you a central dashboard to track stock levels, manage product variants, and make adjustments across the entire catalog. 

Features include:

• Multilocation inventory tracking. When a product is assigned to multiple locations, inventory is tracked separately at each one, and orders are fulfilled based on order routing or shipping profile configuration.
• Shopify POS for store and online inventory visibility. Shopify automatically syncs stock quantities as products are received, sold, returned, or exchanged—whether online or in-store—with no manual reconciling required.
• Alternative fulfillment. Create a self-serve experience where shoppers purchase in-store and have items shipped home. Unified data also lets store associates build virtual carts that are either completed in-store or sent to the customer’s email to finish online.
• Purchase orders and transfers. Send POs to suppliers when inventory levels dip, and manage transfers when inventory moves between locations. 
• Shopify Flow automations. When stock reaches a low threshold, Shopify Flow can notify your team by email, send a reorder request to the vendor, add a low-stock tag to the product page, and post a Slack notification, all without manual intervention.
• App ecosystem and integrations. Shopify integrates with more than 16,000 apps, so you can use its unified inventory data in other platforms. The Global ERP Program, for example, syncs Shopify inventory data with financial, procurement, and supply chain management data within an enterprise resource planning (ERP) system.

How to improve ecommerce inventory management over time

Here are some ways to improve inventory management, depending on business stage: 

Early stage

If you’re early stage, start with:

• SKU cleanup. Audit your product catalog to ensure every variant has a unique, consistent identifier that matches across your POS system, ecommerce platform, warehouse management system (WMS), and supplier POs.
• Reorder points. Multiply average daily sales by supplier lead time, then add a safety stock buffer to account for demand spikes or delivery delays.
• One source of truth. Ensure every sale, return, and stock movement updates in one shared record in real time.
• Regular counts. Run cycle counts that check a rotating subset of SKUs each week, prioritizing your highest-velocity products.

Canadian brand Anián uses Shopify as its one source of truth. “Our supply chain is quite complex, but once everything hits our warehouse, it is logged by Shopify,” says president Paul Long.

“Having all of the product details in the platform and up to date is super helpful, because when you ship a product across the border, you sometimes need to pull up all of that information. They need to trace that good all the way back to exactly where we made it. Shopify allows us to do all of that.”

Scaling

If you’re scaling, focus on:

• Multilocation visibility. Choose an ecommerce IMS that tracks stock at the location level so you always know how much you have, where it is, and whether it’s available to sell. 
• Inventory reporting. Run regular sell-through, days of inventory remaining, and ABC analysis reports to identify which SKUs are performing, which are at risk of stockout, and which are tying up capital. 
• Formalized receiving. Use a scan-on-receipt process that verifies incoming stock against open purchase orders, assigns units to specific locations, and logs discrepancies before goods enter available inventory.
• Channel-aware allocation. Set inventory rules that reflect the fulfillment commitments of each channel, for example, reserving stock for B2B buyers, so that stock isn’t oversold across channels.

French apparel brand K-Way, for example, migrated to Shopify to improve ecommerce inventory management, gaining real-time visibility over more than 200 stores.

Omnichannel or enterprise

When you’re managing inventory across multiple channels, prioritize:

• Smart order routing. Configure fulfillment logic so that every order automatically directs to the nearest location with available stock. This balances proximity to the customer, fulfillment costs, and channel-specific delivery commitments.
• Returns integration. Build a reverse-logistics workflow that automatically restocks approved products in available inventory.
• ERP/WMS alignment. Map which system is the source of truth for each data type—stock on hand, open purchase orders, and financial valuation—and build integrations that push updates between systems in real time.
• Inventory accuracy governance. Create a workflow to log, investigate, and resolve inventory variances. Include an organization chart showing who owns the inventory management process and how discrepancies feed back into process improvements.

Music retailer Swee Lee, founded in 1946, relies on Shopify for this. It migrated from Adobe Commerce (formerly Magento) to Shopify and unified inventory for roughly 60,000 SKUs across stores and online.

Since migrating, Swee Lee has recorded:

• 50% increase in online revenue year on year
• 17% growth in POS revenue year on year 
• Improvement in support resolution time from days to minutes

“With Shopify, each of our stores runs using the same tool and shares the same inventory and customer database,” says group CTO Laurent Le Graverend. “Our online store and all of our retail outlets across different countries function as one, enabling our teams to communicate and collaborate more effectively.”

**Based on a survey of 1,000 Shopify POS customers.