Balance Sheet Foundations
Inventory
Inventory is stock held by the business for sale, production, or consumption in making goods. It is a current asset because it is expected to move through the operating cycle into sales and then cash.
Concept First
Learn It Step By Step
Start with the business meaning, then move into the formula.
What is Closing Inventory?
Inventory still unsold or unused at period end. It is deducted because it has not yet become cost of goods sold. For example, a manufacturer may hold steel as raw material, partly finished components as work-in-progress, and packed goods ready for dispatch as finished goods.
What is Opening Inventory?
Inventory available at the start of the period. It becomes part of goods available for sale or production. For example, a manufacturer may hold steel as raw material, partly finished components as work-in-progress, and packed goods ready for dispatch as finished goods.
What is Purchases or Production?
Goods bought or produced during the period. Only the portion consumed or sold should flow into COGS. Example: use the matching financial statement line item for the same period and keep the unit consistent before calculating.
What is Average Inventory?
Inventory is stock held for sale or production, such as raw material, work-in-progress, finished goods, or traded goods. It is a current asset because it should normally move into sales, but it is not the same as cash; it must first be sold and then collected. For example, a manufacturer may hold steel as raw material, partly finished components as work-in-progress, and packed goods ready for dispatch as finished goods.
How does the formula work?
First classify the stock: raw materials, work-in-progress, finished goods, and traded goods. Add them to get closing inventory. For the movement during a period, begin with opening inventory, add goods purchased or produced, and subtract the cost of goods sold. The unsold part remains as closing inventory on the balance sheet.
How should I read the answer?
Inventory is useful only when it is saleable at a sensible margin. It can support growth, but excess or obsolete stock blocks cash, creates storage and damage risk, and may later require discounting or write-downs.
How inventory moves through the business
Inventory is a balance-sheet stock on one date, but it exists because goods are moving through production, sale, and cash collection.
Raw Materials
Rs. 12 Cr
Inputs waiting for production
Work-in-Progress
Rs. 6 Cr
Partly completed goods
Finished Goods
Rs. 18 Cr
Completed goods ready to sell
Traded Goods
Rs. 4 Cr
Goods bought for resale
Formula Lab
Understand the Formula
Read the formula like a business sentence before calculating it.
Formula 1
Inventory = Raw Materials + Work-in-Progress + Finished Goods + Traded Goods
Formula 2
Closing Inventory = Opening Inventory + Purchases or Production - Cost of Goods Sold
Formula 3
Average Inventory = (Opening Inventory + Closing Inventory) / 2
Why this formula exists
Inventory is the stock a business holds for production or sale. It is a balance-sheet asset, but economically it is cash waiting to complete its journey through production, sale, and collection.
How it is derived
First classify the stock: raw materials, work-in-progress, finished goods, and traded goods. Add them to get closing inventory. For the movement during a period, begin with opening inventory, add goods purchased or produced, and subtract the cost of goods sold. The unsold part remains as closing inventory on the balance sheet.
Simple example
Raw material Rs. 12 Cr + WIP Rs. 6 Cr + finished goods Rs. 18 Cr + traded goods Rs. 4 Cr = inventory Rs. 40 Cr. If opening inventory was Rs. 32 Cr and additions were Rs. 120 Cr, then COGS = 32 + 120 - 40 = Rs. 112 Cr.
Solved Case Study
Read the Numbers Like an Analyst
Work through one business case slowly: understand the situation, calculate the ratios, then interpret what the numbers are really saying.
Case context
A Coimbatore appliance manufacturer holds raw materials of Rs. 12 Crore, work-in-progress of Rs. 6 Crore, finished goods of Rs. 18 Crore, and traded accessories of Rs. 4 Crore. Closing inventory is Rs. 40 Crore. If its opening inventory was Rs. 32 Crore and goods added during the year were Rs. 120 Crore, cost of goods sold is Rs. 112 Crore.
Case: Inventory changes with production and sales
A garment maker opens with inventory of Rs. 40L, produces goods costing Rs. 150L, and closes with unsold inventory of Rs. 55L.
Find the inventory charged to sales
Inventory that remains unsold stays on the balance sheet. Only the consumed or sold portion goes to the P&L as COGS.
Closing inventory of Rs. 55L is still an asset, but it must be saleable and valued carefully.
Read the risk
Inventory is useful only if it can be sold at a sensible price. Old, damaged, slow-moving, or obsolete stock can convert into future losses.
Interpretation
What This Means In Practice
Read the result as a business signal, not as a standalone number.
Inventory is cash in another form
When a company buys or produces stock, cash has moved into inventory. The cash comes back only when the stock is sold and collected. This is why inventory can look like an asset on paper but still create cash pressure.
The mix tells a story
More raw material may mean preparation for production. More WIP may indicate production bottlenecks. More finished goods may mean demand is weaker than expected. The same inventory total can therefore have very different meanings.
Valuation must be conservative
Inventory should be tested against net realisable value. If old stock cannot sell at cost, the balance sheet should recognise the loss rather than carry inventory at an optimistic value.
Growth without movement is dangerous
Inventory rising faster than sales may be seasonal or planned, but it may also signal pile-up, poor forecasting, obsolete stock, or channel weakness. A finance reader asks for the reason before accepting management's explanation.
Avoid These Traps
Common Mistakes
Only the traps that commonly affect this lesson are shown here.
Calling inventory liquid because it is current
Inventory is current because it belongs to the operating cycle, not because it can pay bills immediately. It must be sold and collected before it becomes cash.
Ignoring old or obsolete stock
Old stock may need discounting or write-down. A large inventory number can overstate strength if the stock is damaged, outdated, slow-moving, or no longer demanded by customers.
Forgetting the stock movement equation
Opening inventory plus purchases or production does not automatically become COGS. Closing inventory is the unsold portion and stays on the balance sheet.
Key Takeaway
Inventory is not cash. A finance learner should ask what type of stock it is, whether it is saleable, whether it is valued conservatively, and whether it is growing faster than sales.
Practice Checkpoint
Check Your Understanding
Work through the quiz in smaller sets. Your answers stay visible while this page is open, so you can review before moving on.
Question 1 of 20
Level 1Which description best defines inventory?
Question 2 of 20
Level 1Which item is raw material inventory for a biscuit manufacturer?
Question 3 of 20
Level 1What is work-in-progress inventory?
Question 4 of 20
Level 1Which item is finished goods inventory?
Question 5 of 20
Level 1Why is inventory a current asset but not cash?
15 questions remaining in this lesson.
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Balance Sheet - An Introduction
Balance Sheet Foundations
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