P&L Foundations
Consumption or Cost of Goods Sold
Consumption or COGS is the actual cost of material used up to generate sales, not what was bought or stored.
Concept First
Learn It Step By Step
Start with the business meaning, then move into the formula.
Why do opening and closing inventory matter?
Opening inventory was already available for sale or production. Purchases add more stock. Closing inventory is still unsold, so it should not be charged as current-period cost.
How is COGS calculated?
COGS = Opening Inventory + Purchases or Production - Closing Inventory. If opening stock is Rs. 10L, purchases are Rs. 90L, and closing stock is Rs. 15L, COGS is Rs. 85L.
How should I read the answer?
COGS matches the cost of goods sold to the revenue generated. In most businesses it is the largest cost and should be tracked as a percentage of net sales.
Formula Lab
Understand the Formula
Read the formula like a business sentence before calculating it.
Formula
COGS = Opening Inventory + Purchases or Production - Closing Inventory
Why this formula exists
COGS exists to match the cost of goods sold with the revenue earned in the same period.
How it is derived
Start with Opening Inventory because it was available for sale. Add Purchases or Production made during the period. Then subtract Closing Inventory because those goods were not sold yet. Therefore COGS = Opening Inventory + Purchases or Production - Closing Inventory.
Simple example
Opening Inventory Rs. 10L + Purchases Rs. 90L - Closing Inventory Rs. 15L = COGS Rs. 85L.
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
If opening stock is 100 units, production is 900 units, closing stock is 50 units, and cost per unit is Rs. 100, units sold are 950 and COGS is Rs. 95,000.
Case: Purchases are not the same as COGS
A snacks business starts with opening inventory of Rs. 30L, buys or produces goods costing Rs. 140L, and has closing inventory of Rs. 45L.
Calculate what was consumed
COGS charges only the cost of goods sold or consumed during the period. Closing inventory is still unsold and remains on the balance sheet.
The P&L expense is Rs. 125L, not Rs. 140L. The unsold Rs. 45L stays as inventory.
Read the business signal
If COGS rises faster than sales, check raw material inflation, wastage, yields, product mix, and pricing power.
Interpretation
What This Means In Practice
Read the result as a business signal, not as a standalone number.
Read it through the P&L chain
COGS matches the cost of goods sold to the revenue generated. In most businesses it is the largest cost and should be tracked as a percentage of net sales. Ask where this item sits between revenue, gross margin, EBIT, PBT, and PAT. The same rupee amount can mean different things depending on whether it affects product economics, operating overhead, finance cost, or tax.
What a manager should investigate
Buying more does not mean consuming more. Ask what was actually used to generate sales. Check trend as a percentage of net sales, compare with peers, and identify the driver: price, volume, input cost, overhead control, accounting classification, or one-time item.
Key Takeaway
Buying more does not mean consuming more. Ask what was actually used to generate 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 1A company buys raw material but does not sell finished goods. What happens to consumption?
Question 2 of 20
Level 1What is a common mistake in reading consumption?
Question 3 of 20
Level 1Which underlying item must you understand before calculating or interpreting the result?
Question 4 of 20
Level 1Which statement is the best conceptual reading of this measure?
Question 5 of 20
Level 1While analysing the result, which connected business driver should you also check because it can explain movement in the result?
15 questions remaining in this lesson.
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Revenue from Operations
P&L Foundations
Knowledge Path
Connected Concepts
3 linked lessons