Inventory Control Explained: Methods, Types & Best Practices
Inventory control helps businesses track stock, maintain the right quantities and keep products available when customers need them. A reliable inventory control process can prevent excess stock and shortages while reducing storage costs and improving order fulfillment. This guide explains inventory control systems, methods, techniques and best practices for managing stock more efficiently.
What Is Inventory Control?
Inventory control is the process of tracking and managing the stock a business already has. It helps maintain the right quantities to meet customer demand while avoiding excess inventory and stockouts. The process includes monitoring stock levels, storage locations, receiving, shipping, reorder points and inventory counts. Accurate records also help businesses identify damaged, missing or slow moving stock.
Good inventory control can reduce storage costs, improve product availability and support smoother warehouse operations. It also gives businesses better information for purchasing and supply chain decisions.
Inventory control is part of inventory management, but the two are different. Inventory control focuses mainly on stock on hand. Inventory management covers the wider process, including purchasing, storing, controlling and selling inventory.
Inventory Control vs. Inventory Management
Inventory control and inventory management are closely related, but they are not the same process. Inventory control focuses mainly on the stock a business already has. It covers inventory counts, stock levels, storage locations, product movement and reorder points.
Inventory management has a wider scope. It covers the full inventory process from purchasing products to storing, controlling and eventually selling them. For example, deciding how much stock to purchase is part of inventory management. Tracking where that stock is stored after it arrives is part of inventory control.
A business normally needs both processes. Inventory management helps plan inventory across the wider operation. Inventory control helps keep the physical stock accurate and organized once it enters the business.
Also Read:
Why Is Inventory Control Important?
Inventory can represent a large part of a product based business's current assets and working capital. Keeping too much stock ties up money and increases storage costs. Keeping too little can lead to stockouts, delayed orders and lost sales.
Inventory control helps businesses maintain suitable stock levels based on demand. Even companies that use just in time ordering need accurate inventory records to know what is available and when more stock is required.
Better inventory control can reduce excess stock and free up working capital for other business needs. It can also improve product availability when demand increases. This helps businesses control costs, use storage space efficiently and support more reliable order fulfillment.
Also Read:
How Inventory Control Can Improve Your Business
Good inventory control helps a business keep the right products in stock. It also prevents too much money from being tied up in unused inventory. When stock records are accurate, employees can find products faster and process orders more easily.
Better inventory control also gives businesses a clearer view of what is selling and what is not. This helps with purchasing and stocking decisions. It can improve product availability, order fulfillment and customer service. Inventory control can help reduce problems such as:
Spoilage and expired products that can no longer be sold to customers.
Dead stock and excess inventory that takes up space and ties up business funds.
High storage costs caused by keeping more inventory than the business needs.
Lost or misplaced goods that can make order fulfillment slower and less accurate.
Stockouts and missed sales when popular products are not available when customers need them.
Poor use of warehouse space caused by disorganized or unnecessary inventory.
Unnecessary money tied up in inventory that could be used for other business needs.
For smaller businesses, effective inventory control can be even more important. A large part of available cash may be invested in stock. Keeping inventory at a practical level helps balance customer demand with inventory costs. It also makes working capital easier to manage.
Top 4 Ways to Control Inventory
Businesses can use different inventory control methods to track stock and monitor where products are stored. The right method depends on the number of products, order volume and the size of the operation. A small business may start with a simple manual system. As inventory grows, software can make tracking faster and more accurate.
1. Manual Tracking
Manual tracking uses a ledger, notebook or stock register to record inventory coming in and going out. It can work well for very small businesses with only a limited number of products.
The main limitation is the amount of manual work involved. Reporting is also limited. As sales and stock movements increase, records can become harder to update and check.
Also Read:
2. Stock Cards
Stock cards, also called bin cards, record inventory activity for individual products. A card can show stock received, sales, returns, withdrawals and the remaining quantity.
Each card must be updated whenever stock moves. Missing even one transaction can create a difference between the recorded quantity and the actual stock on hand.
Also Read:
3. Simple Spreadsheets
Spreadsheets such as Microsoft Excel give businesses a simple way to manage inventory electronically. They can record product names, quantities, stock locations and incoming or outgoing inventory.
Formulas can also help calculate totals, reorder levels and basic inventory trends. However, spreadsheets usually depend on manual data entry. They can become difficult to manage when several employees, warehouses or large product catalogs are involved.
4. Advanced Inventory Management Systems
Advanced inventory management systems are useful for larger businesses and more complex supply chains. They can track inventory across multiple warehouses, stores and sales channels from one system.
These platforms may provide real time stock updates, demand planning, inventory analytics and automated reordering. They can also connect with accounting, ecommerce and warehouse management systems. Better integration gives businesses a clearer view of stock across the operation. It also helps teams make faster purchasing and inventory control decisions.
Types of Inventory Control Systems
Businesses generally use two types of inventory control systems: periodic and perpetual. The right choice depends on inventory volume, how often stock moves and how much real time visibility the business needs.
Periodic Inventory System
A periodic inventory system updates inventory records after a physical stock count. Businesses perform these counts at set intervals, such as monthly, quarterly or annually. This method is usually suitable for businesses with smaller inventories or products that do not move frequently.
Pros of Periodic Inventory
Periodic systems are simple to set up and manage. They require little technology and employees can learn the counting process quickly. They can also be cost effective for smaller businesses that do not need continuous inventory updates.
Cons of Periodic Inventory
Inventory records are not continuously updated. This means the recorded quantity may differ from the actual stock between physical counts. Manual counting can also take considerable time as inventory grows. Human errors may lead to inaccurate records, especially when businesses handle many products.
Who Should Use Periodic Inventory?
Periodic inventory works best for businesses with smaller product quantities, slower stock movement or a limited number of SKUs. It may also suit companies that sell larger or higher value products that are easier to count individually.
Perpetual Inventory System
A perpetual inventory system uses software to update inventory records as stock moves through the business. Purchases, sales, returns and other transactions can automatically change the recorded inventory quantity.
The system stores this information in a central database. This gives businesses a more current view of available stock and supports reporting, purchasing and replenishment decisions.
Pros of Perpetual Inventory
Perpetual systems provide near real time inventory visibility. Businesses can check available quantities without waiting for the next full physical count. The system can also support reordering, sales planning and inventory analysis. Automation reduces routine manual work and makes it easier to manage larger inventories.
Cons of Perpetual Inventory
Perpetual inventory systems require software, equipment and system maintenance, which can increase costs. They also depend on accurate transaction data. The recorded quantity can still become inaccurate because of theft, damage, incorrect scans or unrecorded stock movements. For this reason, businesses often use cycle counts or occasional physical counts to verify system records.
Best Inventory Control Methods
The right inventory control method depends on business size, industry, product type and demand patterns. A suitable method can help reduce overstocking, prevent frequent emergency reorders and improve inventory planning. Businesses may use one method or combine several approaches depending on how their inventory moves.
First In, First Out (FIFO)
FIFO means the oldest inventory is sold or used before newer stock. It is especially useful for products with expiration dates or limited shelf lives, including food, cosmetics and pharmaceuticals. Proper stock rotation reduces the risk of products expiring or becoming obsolete while newer inventory remains in storage.
Also Read:
ABC analysis groups inventory according to its value and importance:
A items: High value products that usually require closer control.
B items: Moderate value products that need regular monitoring.
C items: Lower value products that are often held in larger quantities.
This method helps businesses focus more attention and resources on inventory with the greatest financial impact. It can also support better purchasing and stock control decisions.
Economic Order Quantity (EOQ)
Economic Order Quantity uses a formula to determine an efficient quantity to order at one time. Its goal is to balance ordering costs with inventory holding costs.
EOQ works best when demand and lead times are reasonably predictable. Ordering suitable quantities can reduce excess stock, avoid unnecessary rush orders and help businesses use working capital more efficiently.
Fast, Slow and Non Moving (FSN)
FSN analysis groups inventory according to how frequently products move:
Fast moving: Products sold or used frequently.
Slow moving: Products with occasional sales or usage.
Non moving: Products with no movement during a defined period.
This method helps businesses identify demand patterns and make better decisions about purchasing and storage. Fast moving products can be placed in easy to access warehouse locations while slow or non moving stock can be reviewed for reduction or clearance.
Vendor Managed Inventory (VMI)
With Vendor Managed Inventory, the supplier helps monitor and replenish a customer's stock based on agreed inventory levels and usage data. VMI can work well for products with high and predictable demand. It can reduce the buyer's replenishment workload while helping maintain more consistent stock availability.
Batch Tracking
Batch tracking assigns lot or batch information to groups of inventory. Businesses can follow these products as they move through receiving, storage, production and distribution.
This method improves traceability and makes it easier to identify affected products during recalls or quality issues. It is especially useful in regulated industries where businesses need detailed records for compliance and quality control.
Also Read:
Key Techniques for Inventory Control
Inventory control methods become more effective when businesses support them with practical techniques. These techniques help maintain accurate stock levels, plan replenishment and reduce unnecessary inventory costs.
Just in Time (JIT) Inventory
Just in Time inventory means receiving products or materials close to when they are needed for production or sale. This reduces the amount of stock kept in storage and can lower inventory holding costs.
JIT requires reliable suppliers and accurate demand planning. Supply delays can quickly cause shortages, so businesses may need backup suppliers or a suitable level of safety stock for critical items.
Safety Stock and Reorder Points
Safety stock is extra inventory kept to cover unexpected demand or supply delays. A reorder point is the stock level that signals when a business should place another order.
Using both techniques helps reduce the risk of stockouts while avoiding unnecessary excess inventory. Reorder alerts can also automate part of the replenishment process.
Also Read:
Inventory Audits and Cycle Counting
Cycle counting checks small portions of inventory on a regular schedule instead of counting every item at once. This allows businesses to verify stock records without significantly interrupting normal operations.
Regular counts can identify missing products, recording errors and other inventory differences earlier. Businesses can then correct problems before they affect purchasing or order fulfillment.
Average Costing
Average costing calculates inventory value using the average cost of similar units purchased at different prices. It can simplify inventory valuation when a business frequently buys identical or similar products.
This technique reduces the effect of individual purchase price changes on inventory valuation. It also supports more consistent cost of goods sold calculations and financial reporting.
7 Top Inventory Control Best Practices
Effective inventory control requires clear procedures, accurate records and consistent practices. The right approach depends on the size of the business, its products and how quickly inventory moves. Businesses should also choose inventory software based on the features they actually need.
1. Use a Process Improvement Method
Process improvement methods can help businesses find waste, errors and inefficient inventory activities. Common approaches include Lean, Kaizen and Six Sigma. These methods can improve more than inventory control. Businesses can use them to improve purchasing, storage, production and order fulfillment processes.
2. Improve Purchasing Procedures
Use sales data and demand forecasts to make better purchasing decisions. Review which products sell regularly and which items are becoming slow moving or obsolete. Businesses should also adjust reorder points and safety stock as demand changes. This helps prevent both excess inventory and unnecessary stockouts.
3. Build Strong Supplier Relationships
Reliable suppliers make inventory planning easier. Regular communication can help businesses respond faster to shortages, demand changes and delivery delays.
Suppliers may also offer flexible minimum order quantities, faster replenishment or options for returning certain unsold products. Clear agreements on lead times and order quantities can reduce supply problems.
4. Automate Inventory Reports
Inventory systems collect useful data about stock levels and movement. Automated reports make this information easier to review and use. Businesses can track stock status, inventory history, aging inventory and discrepancies. Relevant reports can also be shared with suppliers when better visibility helps them prepare for future orders.
5. Conduct Risk Assessments
Inventory operations can face unexpected problems such as demand spikes, supplier delays, limited warehouse space, inaccurate stock records and slow moving products. A risk assessment helps identify which problems could have the greatest impact. Businesses can then prepare suitable responses such as backup suppliers, safety stock or alternative storage options.
6. Audit Inventory Regularly
Regular audits help confirm that recorded inventory matches the actual stock. Businesses can use physical counts, spot checks or cycle counting.
A physical count checks all inventory at once. Spot checks focus on selected products while cycle counting checks different groups throughout the year. High value or fast moving items may need more frequent checks.
7. Use Selective Inventory Control and Forecasting
Not every inventory item requires the same level of control. Businesses can classify products based on factors such as value, demand, seasonality, purchase difficulty and consumption rate.
Methods such as ABC analysis help identify which products require closer attention. This allows businesses to focus inventory planning and resources on the items that have the greatest operational or financial impact.
Controlling Inventory Along the Supply Chain
Inventory control applies across the supply chain, from production to warehousing and fulfillment. Businesses can use different techniques depending on the products they handle, demand levels and storage needs.
Batch Control
Batch control involves producing goods in planned quantities. The goal is to keep enough materials available to complete production without holding unnecessary inventory.
This method can work well with Lean manufacturing and Just in Time inventory. Proper batch sizes can reduce excess materials, storage requirements and production costs.
Businesses may use third party logistics providers for warehousing, distribution and order fulfillment. Some companies use 3PL services throughout the year while others need extra support during busy seasons.
When outsourcing inventory activities, businesses still need accurate tracking and clear handling procedures. Regular stock reconciliation and shared inventory data can reduce errors, missing products and fulfillment problems.
Bulk Ordering and Shipping
Bulk ordering can lower the unit cost of products with steady and predictable demand. Suppliers may offer volume discounts and businesses can also reduce the frequency of purchase orders.
However, larger orders require more storage space and tie up additional working capital. Bulk buying also increases the risk of obsolete or expired stock. Businesses should compare these risks with the potential savings before increasing order quantities.
Stock Quantities: How Much Should You Keep?
The right stock quantity depends on the type of inventory, customer demand, supplier reliability and production requirements. Raw materials, work in progress, finished goods and consumables each require different planning.
When deciding how much raw material to keep, consider supplier reliability, alternative suppliers, production schedules and expected demand. Bulk discounts may also influence order quantities.
Businesses that depend on longer lead times or less reliable suppliers may need additional safety stock to protect production from delays.
Work in Progress
Work in progress (WIP) includes products that have entered production but are not yet finished. Holding too much WIP increases storage and handling costs. A suitable amount can still provide flexibility when production problems occur. For example, available WIP may help keep another stage of production operating when equipment downtime affects part of the process.
Finished Goods
Finished goods should generally reflect expected customer demand and order requirements. Businesses may keep additional finished stock for predictable demand, seasonal sales or confirmed large orders.
Too much finished inventory can increase carrying costs and the risk of obsolete stock. Too little can result in stockouts and delayed customer orders.
Also Read:
Consumable Stock
Consumable inventory includes supplies that a business regularly uses during operations. The amount kept on hand should reflect usage rates, supplier reliability and replenishment lead times.
Keeping extra consumables may make sense when demand is stable, prices are expected to rise or bulk purchasing provides meaningful savings. Businesses should still avoid holding more than they can reasonably use.
Inventory Control Policies and Processes
Inventory control starts when goods enter a business and continues through storage and shipping. Standard operating procedures (SOPs) help employees follow consistent steps and maintain accurate stock records.
What to Include in an Inventory Control SOP
An inventory SOP should cover receiving, storage, tracking, stock rotation, security and shipping. It should also define:
Inventory duties: Separate stock handling and financial responsibilities where possible.
Stock accuracy: Perform regular counts to keep records accurate.
Inventory tools: Define how software, scanners, RFID or spreadsheets should be used.
Stock levels: Set minimum stock, safety stock and reorder points.
Regular reviews: Update inventory procedures as business needs change.
Inventory budget: Plan for purchasing, storage, handling and logistics costs.
Basic Invoice Control Policies
Invoice policies help businesses maintain accurate sales records and collect payments on time. Procedures should cover purchase orders, delivery receipts, invoices and overdue payments.
Use consistent invoice templates with order details, dates, amounts and payment terms. Businesses with higher transaction volumes can also use invoicing software to automate records, track unpaid invoices and simplify payment follow ups.
Final Thoughts
Effective inventory control is about keeping the right products available at the right time without holding more stock than the business needs. Accurate records, regular inventory checks and suitable control methods can help reduce stockouts, excess inventory and unnecessary storage costs.
There is no single inventory control method that works for every business. Companies should consider their product types, demand patterns, storage capacity and supply chain before choosing a system or technique. Whether a business uses manual tracking, spreadsheets or advanced inventory software, consistent processes and regular reviews are important for keeping inventory accurate and under control.
Comments