ACCT90009 Chap.6 Absorption, Variable Costing and CVP

Absorption, Variable Costing and CVP

Standard canon anchored to Week 6. Absorption defers fixed manufacturing overhead in inventory; variable costing expenses it in-period.

CVP uses contribution to solve break-even and target volume under explicit range, mix and demand assumptions.

Detailed chapter study map

AskSia Library · ACCT90009 · Strategic Cost Management · University of Melbourne COSTING LENSES Week 6 · standard canon STANDARD CANON Two costing lenses, one CVP model Inventory timing, contribution margin and break-even The official Week 6 topic is Absorption & Variable Costing and CVP Analysis.

This chapter presents standard accounting canon; current Canvas materials determine exact notation and depth. Absorption and variable costing differ in the timing of fixed manufacturing overhead. CVP compresses price, variable cost, fixed cost and volume into a short-run planning model. Both are useful only when their boundary and assumptions are explicit.

Lens Product cost Fixed manufacturing OH Primary insight Absorption Variable manufacturing + fixed manufacturing Inventoried then expensed with

sales External inventory/full manufacturing cost Variable Variable manufacturing only Expensed in the period Contribution and short-run behaviour CVP Variable cost per unit or ratio Treated as fixed within range Volume needed for profit target Timing, not lifetime economics When production and sales differ, absorption can defer or release fixed manufacturing overhead through inventory.

Over the full life of all units, both methods recognise the same total fixed overhead. The current-period profit difference is a timing and inventory movement effect. Contribution is not net profit Contribution margin shows what remains after variable cost to cover fixed cost and profit.

A positive contribution product can still be part of an unprofitable organisation if fixed capacity is excessive.

It also may consume a scarce resource with a lower contribution per bottleneck unit than alternatives. ! Do not blend the two income formats Gross margin under absorption and contribution margin under variable costing use different cost classifications. Label the format before interpreting a subtotal.

Costing methods change timing and visibility; they do not change the resources already consumed.

Week 6 principle {PG} · asksia.ai/explore AskSia Library · ACCT90009 · Strategic Cost Management · University of Melbourne ABSORPTION Absorption costing Fixed manufacturing overhead enters inventory Production cost, gross margin and inventory timing Absorption product cost includes direct materials, direct labour, variable manufacturing overhead and allocated fixed manufacturing overhead.

Selling and administrative cost remains period cost.

Units produced but not sold carry a share of fixed manufacturing overhead in inventory; units sold release that share into cost of sales. ABSORPTION UNIT COST [formula shown in the full chapter] Denominator and idle capacity Using a low production denominator raises fixed overhead per unit and can load idle-capacity cost into products.

A practical-capacity view can keep unused capacity visible. The reporting policy may require a particular approach; managerial interpretation should still identify whether capacity is used, unused or avoidable. Production incentive If managers are rewarded on absorption profit, producing more than sales can defer fixed overhead and increase current profit. Inventory, cash, obsolescence and quality may worsen.

Pair profit with inventory days, forecast accuracy and throughput; do not

reward production that lacks demand.

Item Absorption classification Reason Direct material Product Manufacturing resource traced to units Factory supervision Product through allocation Fixed manufacturing overhead Sales commission Period Selling, often variable with sales Head-office rent Period Non-manufacturing capacity Unsold-unit fixed OH Inventory Released when unit is sold P6.1 Classification Answer included Is a fixed factory lease expensed immediately under absorption?

Answer. It enters product cost through allocation and is expensed as units are sold; any share in ending inventory is deferred. P6.2 Behaviour Answer included Does producing extra units save fixed factory cash? Answer. No. It spreads/deferes allocated cost unless capacity spending itself changes.

{PG} · asksia.ai/explore AskSia Library · ACCT90009 · Strategic Cost Management

· University of Melbourne VARIABLE COSTING Variable costing Contribution separates unit economics from capacity Variable manufacturing product cost and period fixed overhead Variable product cost includes only variable manufacturing resources. Fixed manufacturing overhead is expensed in the period.

The income statement groups variable and fixed costs to show contribution margin. This structure aligns with CVP and many short-run decisions, but it does not make every fixed cost irrelevant or every variable cost avoidable.

CONTRIBUTION FORMAT [formula shown in the full chapter] [formula shown in the full chapter] All variable costs means all functions Variable selling cost belongs below sales in the contribution format even though it is not a product cost. Variable manufacturing cost belongs in product cost. Keep the distinction between inventory classification and

behaviour classification: the two systems answer different questions.

Capacity remains a management question Expensing fixed manufacturing overhead makes capacity cost visible in the period, but the decision still needs a horizon. Some capacity is committed, some discretionary and some avoidable later. A contribution analysis should state what happens to released capacity.

Question Useful view Caution Short-run order Incremental contribution Capacity and price precedent Product continuation Contribution plus avoidable fixed cost Shared capacity and network effects Inventory reporting Absorption Allocation and capacity denominator Volume planning Contribution/CVP Linearity, mix and range Long-run viability Lifecycle full resources Short-run contribution is incomplete !

Variable does not equal relevant A variable cost can be common to alternatives or already committed;

a fixed cost can be avoidable. Apply the future-and-different test in Chapter 7. Contribution shows what activity adds before capacity cost; it does not decide whether capacity should exist. Variable-costing insight {PG} · asksia.ai/explore AskSia Library · ACCT90009 · Strategic Cost Management · University of

What this chapter covers

• 01

  Absorption vs variable profit

• 02

  Contribution format

• 03

  Break-even and target profit

• 04

  Margin of safety, mix and leverage

AskSia-authored practice weighting (not an official mark scheme): Service CVP

Key terms

Contribution margin

Sales minus variable cost.

Margin of safety

Expected sales above break-even.

Absorption, Variable Costing and CVP FAQ

Exam move

Reconcile the inventory effect, prove CVP volumes and solve the assumption threshold rather than relying on a single forecast.

Working through Absorption, Variable Costing and CVP in ACCT90009? Sia is AskSia’s AI Accounting tutor — ask any ACCT90009 Absorption, Variable Costing and CVP question and get a clear, step-by-step explanation grounded in how ACCT90009 is taught and assessed. Read this chapter free, then take your hardest questions to Sia.