SLOB inventory and supply chain waste costs retailers $163 billion a year. Learning to detect the problem of slow moving inventory in time and what measures can be taken to prevent it can save you a lot of resources. What can you do if you have a lot of goods that cannot be sold in stock?
Key Takeaways:
SLOB (Slow-moving and Obsolete) inventory results from poor demand forecasting, inefficient supply chains, or fast-changing technologies;
Such inventory ties up capital, increases storage costs, and leads to write-offs—impacting profitability;
Key detection methods include ABC/XYZ analysis, turnover ratio tracking, expiry monitoring, and forecast accuracy assessments;
Retailers can reduce SLOB through promotions, rebranding, returns, or donations, and prevent it by automating forecasting, replenishment, and visibility;
AI-powered tools like LEAFIO Inventory Optimization enable real-time inventory analysis, order automation, and efficient stock management across stores.
SLOB Inventory: What Is It?
Slow-moving and obsolete inventory (SLOB) is the result of poor demand forecasting efficiency. It rears its head when supply is higher than demand for a certain period of time. However, slow-moving and obsolete inventory are not the same things.
Slow-moving inventory is goods that have been on sale for a long time. Methods for identifying them differ across industries, and retailers typically set limits to define such products.
Obsolete inventory or dead inventory is products that have reached the end of their life cycle, and the retailer is sure that they will no longer be able to sell them.
Slow Moving and Obsolete Inventory Causes
What is the reason for the accumulation of obsolete inventory and slow moving inventory? There are several reasons: from mistakes in demand forecasting to rapid changes in trends and technologies.
#1 Poor inventory forecasting accuracy
One of the most common causes of slob inventory is inaccurate forecasting based on historical sales data. When inventory forecasting based on historical sales data is inaccurate, retailers risk ordering too much and being left with excessive inventory, some of which will lose value over time. Of course, it is almost impossible to predict demand with 100% accuracy. However, it is by all means worth it improving the accuracy, including with the help of modern AI and ML software. The system independently analyzes the provided data, finds patterns, and makes accurate expert forecasts.
#2 The impact of seasonal or cyclical demand
In the context of cyclical sales, it is important to make correct forecasts and estimate the right volume of goods before purchasing. The risk is that when goods lose their relevance, they move to stock and it is not always possible to put such outdated goods up for sale in the next season or cycle again.
A common slow moving inventory example in pharmacies is seasonal allergy medication that sells well only a few months a year and remains idle on the shelf during the off-season.
#3 Low supply chain efficiency
The problem of managing slow moving inventory arises if:
- you don't have up-to-date data on goods arrivals and stocks;
- you don't manage your inventory accurately;
- suppliers deliver goods late.
As a result, products arrive late or their quantity does not meet demand. Due to the imbalance between supply and demand, some products remain in stock until they eventually become obsolete.
#4 Technological changes
The rapidly accelerating world has brought continuously evolving technologies and shorter production cycles. Manufacturers release new models of smartphones just months after their previous release of the state-of-the-art model. In this situation, all unsold older models become outdated, and the retailer risks not being able to sell them. That is the start of inventory obsolescence.
Slow Moving Inventory Hurts Your Business
Maybe you are reading this now with a healthy dose of skepticism. What could be wrong with keeping a bit of old inventory? There's a chance it will sell later. The truth is that keeping such stock is a risk most retailers cannot afford and brings on these consequences:
Tied up capital
The company has purchased goods and spent a significant amount of money on them. This money is essentially stuck and the retailer cannot use the resources for better goods. Therefore, SLOB inventory is essentially a product with an opportunity cost.
Increased storage costs
Obsolete inventory will not sit in the warehouse for free. More resources need to be expended on storage like utility bills, insurance, warehouse staff salaries, and more. At the same time, this leads to a depreciation of the warehouse: you are wasting space, and your employees are forced to deal with goods that have no value or are gradually losing it.
Too much inventory in a warehouse can lead to a loss of up to 30% of annual profits. This is a serious challenge even for large retailers. What about small businesses then?
Lost opportunity costs
By storing an excessive amount of slow moving stock, a company cannot make a profit and invest it in business growth. For example, it might not have enough funds to purchase new fast-moving inventory.
Impairment and write-offs
Eventually, SLOBs will have to be disposed of: sold at a discount, donated to charity, or written off due to legal requirements for accounting for obsolete inventory. Obviously, this causes the retailer to lose money.
SLOB Inventory: How to Identify?
Let's look at a few key methods for slow moving inventory calculation.
ABC(D)/XYZ analysis
Both types of analysis are effective solutions for classifying inventory based on demand, cost, and variability.
ABC(D) analysis allows for identifying low-turnover goods in advance, determining the most popular items, and categorizing products based on sales stability and demand fluctuations. There are four categories of goods:
- Category A – these are the highest-value products, typically accounting for 50% of sales or revenue, and require strict inventory control to avoid shortages.
- Category B – products in this category cover around 30% of sales and have moderate importance, needing regular but not as strict oversight as Category A.
- Category C – these items represent 15% of sales, with lower demand or profit margins, and require less inventory control.
- Category D – the least important products, making up about 5% of sales, with minimal inventory management needed due to low demand or infrequent sales.
XYZ analysis is a complement to ABC. It helps to measure the variability of demand for each product:
- X - products with predictably stable demand, which are the easiest to manage;
- Y - products with moderately variable demand, which have to be reassessed more often;
- Z - products with unpredictable demand. If you accumulate a lot of it, you will face the problem of SLOB inventory.
For best results, combine the two analyses and divide the products into groups that require priority inventory management solutions and those that can lead to slow inventory turnover.
Inventory turnover ratio
Inventory turnover ratio shows how many times you managed to sell and replace inventory during a given period. If there is a low turnover rate, this is a sign of a large amount of slow-moving stock. Monitor this indicator, and you will understand which products are inefficient at this particular moment. This will allow you to make a timely decision to sell them or, for example, remove them from the warehouse.
Demand forecast accuracy
This indicator shows the gap between forecasted and actual demand, helping to identify the risk of accumulating slow-moving or obsolete inventory. If forecasts for a particular product are consistently overestimated over time, this may signal a potential buildup of slow-moving goods. It is important to monitor this and make timely adjustments to avoid excess stock.
Expiry and shelf-life monitoring
If a retailer works with perishable goods, it is important to track expiration and shelf life. If it is approaching the end, these products should be prioritized (for example, by reducing the price or putting them in the most prominent places on the shelves). In this way, you can reduce the number of products that have lost value.
Obsolete Inventory Reduction: Best Practices to Succeed
What can you do to reduce the SLOB inventory problem in your store or chain? Here are some reliable ways.
Promotions and discounts
How to sell slow moving inventory? Offer your customers increased economic value without a total price cut. Promotions such as "Buy a product and get 50% off a similar product" or "Buy 2 and get 1 free" are temporary opportunities to activate inventory movement. Other possible options include:
- a joint discount on a product that can be combined with a slow-moving or losing-value product;
- early access to the next new product if you buy the old one;
- free shipping and other low-cost offers.
Repackaging or rebranding
You can repackage a product. For example, if you used to sell laptops for designers, but the features are outdated, try positioning them as a great solution for schooling.
If your product is still viable, try targeting a different demographic. Expand your audience: including through online sales abroad. But be careful: repackaging and rebranding will require additional investment. Make sure that the expected profit will cover these costs.
Product returns and buybacks
Try to establish cooperation with suppliers and establish conditions under which you can return unsold (obsolete) goods and receive some compensation for this.
Donation or liquidation
You can reduce the cost of writing off obsolete goods by donating them to charitable organizations. Of course, this means a complete loss of the money spent on the purchase. However, you can think of it as an investment in strengthening your brand's reputation. If you have a category of products that cannot be donated, make sure you write them off correctly and account for them accordingly.
How to Reduce Slow Moving Inventory? 7 Ways
The problem of slow-moving inventory is easier to prevent than to solve. Let us tell you how to do it.
Perform slow moving inventory analysis regularly
It's very important to analyze inventory and trends to improve supply chain planning. Check sales data at least once a month and compare it to current inventory levels. This will help you to:
- calculate the level of inventory turnover;
- identify products with seasonal sales patterns;
- timely notice a drop in demand for certain categories of goods.
Regular inventory analysis will also help identify the source of obsolete goods. This is calculated as the ratio between the average inventory and the cost of goods sold (for a certain period of time).
LEAFIO Inventory Optimization will help you keep your finger on the pulse – the software monitors inventory levels 24/7 and analyzes the effectiveness of inventory management.
Implement tools for demand forecasting
Analyze historical data to predict demand for each inventory number and avoid buying too much. But this is not enough: the forecast becomes more accurate if you take into account market trends: study what's new in the industry, the trends of each season, and the current needs of customers.
Obviously, doing this manually is difficult and time-consuming. That's why you should implement software solutions that do it automatically. Systems based on artificial intelligence and machine learning help you understand which products sell fast and which sell slower when the available stock for each SKU will run out, what trends may change demand planning, and much more.
Optimize your ordering processes
Place orders only when you need them: this will help reduce the risk of accumulating surplus stock and reduce excess inventory value. It sounds simple enough, but how do you achieve this? To do this, you need to set up reorder points. Determine at what stock level a new order should be placed for each item. Make this process automatic with modern inventory management software.
This is how LEAFIO AI Replenishment Software works. The software independently calculates the quantity for each order, creates it, sends it and monitors its execution.
Achieve maximum inventory visibility
Integrate your inventory management system into your processes to track and manage stock levels across all your warehouses and stores in real time. This approach is much more efficient, freeing staff from routine tasks and improving accuracy. With such software, you can clearly see inventory levels at each location and ensure there's enough stock to meet future demand in every store. You also know what goods have been ordered and which are currently in transit.
Dispose of obsolete stock
Periodically check your balances and identify slow moving inventory and obsolete items. Remove them through promotions, discounts, or sales: this is what we discussed above. If products are not selling due to obsolescence or a complete lack of demand, look for ways to recycle them or contact charitable organizations. You may have what they need.
Establish cooperation with suppliers
The success of your business largely depends on the accuracy and regularity of your deliveries. That's why it's important to find reliable partners and establish mutually beneficial relationships with them. What you need to achieve from this cooperation:
- favorable ordering conditions;
- a fair return policy;
- strict adherence to the schedule.
Some suppliers offer VMI in return, which is the creation of inventory that they manage. Consider this option if it fits your business model. Usually, it's better to keep everything under control yourself: just implement the necessary software solutions.
Invest in new technologies and staff training
Introduce new technologies into your inventory management and performance monitoring and analysis processes. At the same time, train your employees to ensure they understand why optimal inventory balance is important and are ready to put it into practice.
Introduce SOP – standard operating procedures – to help staff follow instructions. This will reduce the number of human errors at the stages of processing, storage, and movement of goods.
Conclusion: Take Control of Your SLOB Inventory
Timely monitoring of slow-moving inventory and obsolete stock management are important steps for the successful operation of a retailer. If you control this inventory, you avoid tied-up capital risk, save on warehouse storage, and minimize costs due to impairment. That's why it's important to regularly analyze and track inventory and identify slow-moving and obsolete items in a timely manner. If you notice it early, you can make timely management decisions.
Modern inventory management software is your reliable assistant. Implement software solutions based on artificial intelligence and machine learning to get accurate demand forecasts, optimize and automate orders, and track every link in the supply chain. Remember that this is one of the most important elements of a modern retail business process.
Have a question?
Have inquiries about retail automation or optimization? Talk to our expert for solutions!
Ben Starinsky
AI-driven retail transformation expert
