Inventory is everything a business holds to sell or use in making its products — raw materials, work-in-progress, and finished goods, plus operating supplies and safety stock. It's recorded as a current asset on the balance sheet and becomes cost of goods sold once sold.
What Is Inventory?
Inventory is a business's "stuff" — the goods, materials, and products it needs to keep operations running and to fulfil sales. It's one of the largest current assets for product companies, and how well it's managed directly affects cash flow and profitability. (The word comes from the Latin inventarium, "a list of what is found.")
The 5 Types of Inventory
| Type | What it is | Examples |
|---|---|---|
| Raw materials | Basic inputs used to make products | Fabric, wood, metal |
| Work-in-progress (WIP) | Partially completed products | Items on the assembly line |
| Finished goods | Completed products ready to sell | Warehouse stock, shelf items |
| MRO supplies | Maintenance, repair & operations support | Repair parts, tools, supplies |
| Safety stock | Buffer held for emergencies | Extra units against demand spikes |
What Inventory Includes
- Items ready for sale
- Materials used in production
- Work-in-progress goods
- Supplies that support operations
Why Inventory Matters
- Ties up cash: every unit on the shelf is money not yet earned — too much inventory strangles cash flow.
- Drives COGS: inventory sold during a period becomes cost of goods sold, shaping gross profit.
- Signals demand: rising finished-goods inventory can mean slowing sales; thin safety stock risks stockouts.
Inventory FAQ
What is inventory in simple terms?
It's all the goods and materials a business holds either to sell or to use in making what it sells — from raw materials through to finished products on the shelf.
What are the main types of inventory?
Five: raw materials, work-in-progress (WIP), finished goods, MRO (maintenance, repair & operations) supplies, and safety stock.
Is inventory an asset?
Yes — inventory is a current asset on the balance sheet. When it's sold, its cost moves to the income statement as cost of goods sold (COGS).
What's the difference between inventory and supplies?
Inventory is held to sell (or to become part of what you sell). Supplies (MRO) support operations but aren't sold to customers — though both are tracked as assets until used.
