Inventory items are the goods and materials a business holds for sale, production or operational support. Classifying them into categories such as raw materials, work-in-progress, finished goods and consumables helps businesses track stock accurately, control costs and avoid overstocking or shortages.
Inventory of products vs inventory of materials
Inventory items can be broadly understood under two categories:
- Product inventory: Inventory that is ready for sale or resale, such as retail goods or finished goods. These directly generate revenue and are managed based on demand and turnover.
- Material inventory: Inventory used in manufacturing, such as raw materials or components. These are managed to ensure continuous production rather than direct sales.
Main types of inventory items based on business stage
Main types of inventory items based on business stage are classified according to where they sit in the production cycle and how they are used in operations.
- Raw material inventory: These are the basic inputs used in production. These items enter the production process at the initial stage. For example, steel in manufacturing or fabric in garment production.
- Work-in-progress (WIP) inventory: Products that are partially finished and still under production. These items have entered production but are not yet ready for sale.
- Finished goods inventory: Completed products ready for sale. These directly contribute to revenue and must be managed carefully to avoid overstocking.
- Maintenance, repair and operations (MRO) inventory: MRO products facilitate operations but are not included in the finished product. These include tools, spare parts and supplies required to maintain operations.
Classification of inventory items based on value and usage
Inventory classification groups items based on value, usage, cost or significance to improve control and decision-making.
- ABC classification (value-based)
- A items: Items that contribute the highest value to total inventory, even if they are fewer in number. In most cases, a small percentage of items (around 10–20%) accounts for a large share of total inventory value.
- B items: Items of moderate value that require a moderate level of control and periodic review.
- C items: Items that make up the majority of inventory but contribute minimally to the total value. These items are managed with basic controls, such as bulk purchasing and limited monitoring.
- FSN classification (movement-based)
- Fast-moving items (F): Items identified based on high sales or consumption frequency. These should be replenished regularly.
- Slow-moving items (S): Items with moderate usage that need to be monitored to avoid overstocking.
- Non-moving items (N): Products with little to no movement, identified using inventory ageing analysis. This may indicate dead stock.
- HML classification (cost-based)
- High-cost items (H): Items with the highest unit cost, determined by ranking inventory based on cost per unit. These require stringent financial control.
- Medium-cost items (M): Items of average unit price that need regular review.
- Low-cost items (L): Items with low unit cost that are typically bought in bulk and controlled with simpler systems.
- VED classification (criticality-based)
- Vital items (V): Items required in operations, whose absence can stop production or services.
- Essential items (E): Necessary items but not immediately critical to operations.
- Desirable items (D): Items that are useful but not critical to operations.
Examples of inventory items across different businesses
The following are some examples of inventory items in different types of businesses:
- Manufacturing business
- Raw materials: Raw materials used at the beginning of the production process, e.g., steel, wood or cloth. Here, shortages may halt production altogether.
- Work-in-progress (WIP): Incomplete products, such as semi-assembled goods. These represent invested costs that are not yet revenue, so delays can affect cash flow.
- Finished goods: Products that are ready to be sold, like packaged goods. These should align with demand to prevent overstocking.
- MRO items: Spare parts or tools used to maintain equipment. These are not sold but are necessary to keep operations running.
- Retail business
- Finished goods: Products available for sale, such as clothes or electronic goods. These directly contribute to revenue and must be replenished.
- Seasonal inventory: Products kept in stock for a specific period, such as winter clothes or holiday items. Unsold stock may result from poor planning.
- Packaging materials: Items like bags and boxes used to deliver products. These are low-cost but essential for daily operations.
- Service-based business
- Consumables: Items consumed during service delivery, e.g., stationery or cleaning materials. These need frequent restocking.
- Tools and equipment: Items required to deliver services, such as repair tools or medical equipment.
- Spare parts: Parts stored for use in service or repairs, helping minimise customer downtime.
How businesses organise inventory items effectively
Effective inventory organisation is essential for maintaining accuracy, improving stock control and ensuring smooth day-to-day operations.
- Grouping items by category, type or usage: Businesses group items into logical categories to make them easier to track and report on.
- Assigning identifiers or codes: Every item is assigned a unique identifier (e.g., SKU) to monitor its movement and availability.
- Maintaining clarity between inventory types: Clear separation between raw materials, WIP and finished goods improves control and accuracy, helping prevent errors in reporting.
Conclusion
Inventory items span all stages of a business’s operations, from raw materials and work-in-progress to finished goods and supporting supplies. Classifying them correctly helps businesses maintain tighter control, reduce unnecessary costs and improve overall operational efficiency.
As operations grow in scale and complexity, systematic inventory management becomes essential for accuracy and consistency in tracking and reporting. Tools such as TallyPrime support this by helping businesses maintain structured, reliable inventory data that strengthens day-to-day decision-making and control.
