Cost and Management Accounting — BEP, Cost Sheets & Contract Costing: quick revision, 17 bites

Contribution Margin: The Engine of BEP

No contribution, no break-even.

**Contribution margin** is what's left from sales after variable costs — it first covers fixed costs, then becomes profit.

Takeaway. Every BEP, MOS, and profit-target calculation starts from contribution.

P/V Ratio and BEP in Rupees

One ratio unlocks every sales target.

Takeaway. P/V ratio tells you how many paise of each sales rupee become contribution.

Multi-Product BEP: Weighted Average Method

Mix products, then break even.

When a firm sells multiple products, BEP is found using the **weighted average contribution per unit** based on the sales mix.

Takeaway. Changing the sales mix changes the weighted average contribution — and therefore the BEP.

Required Sales for a Target Profit

Want profit? Add it to fixed cost.

Takeaway. Desired profit is layered on top of fixed cost in the numerator.

Reversed Sales Mix Changes BEP

Swap the mix, shift the BEP.

Takeaway. BEP is mix-sensitive; always recompute when proportions change.

Effect of a Variable Cost Increase on BEP

Costs up, BEP up.

If variable cost of a product rises, its contribution per unit falls, so the weighted average contribution falls and **BEP rises**.

Takeaway. Higher variable cost → lower contribution → higher BEP.

Margin of Safety (MOS)

Cushion above break-even.

Takeaway. A high MOS means the business can absorb a sales drop safely.

Cost Sheet: Building Total Cost Step by Step

Stack costs in the right order.

Takeaway. A cost sheet builds cost in layers — prime, works, production, then cost of sales.

Contract Costing: Work Certified vs Uncertified

Certified work earns cash.

Takeaway. Only certified work triggers cash inflow; uncertified work is shown as work-in-progress.

Notional Profit in Contract Costing

Profit isn't real until certified.

Takeaway. Notional profit is adjusted for cash received and stage of completion before transfer to P/L.

Overhead: Allocation vs Apportionment

Direct vs shared costs.

Takeaway. Allocation is whole-to-one; apportionment is shared-to-many.

Allocation vs Apportionment at a Glance

One cost, two ways to assign.

Takeaway. If a cost belongs entirely to one centre, allocate; if shared, apportion.

ABC Analysis: Classify Inventory by Value

20% of items, 80% of value.

ABC analysis ranks inventory by **annual consumption value**, not by quantity.

Takeaway. Focus managerial attention on A items — they carry most of the inventory value.

Over vs Under Absorption of Overhead

Absorbed ≠ actual overhead.

Takeaway. Compare absorbed overhead with actual overhead to know which side you're on.

Abnormal Gain vs Abnormal Loss

Normal is expected; abnormal is not.

Takeaway. Both are valued at normal cost and routed through Costing P/L — never mixed with normal loss.

Exam Strategy: Show Your Working

Marks hide in the steps.

Takeaway. Step-wise presentation earns method marks even if the final answer slips.

Remember: S − V = F + P

One equation, all of BEP.

At BEP, P = 0, so S − V = F. For target profit, S − V = F + desired profit.

Takeaway. The single equation S − V = F + P generates every BEP and target-profit formula.