Managerial and Cost Accounting
Managerial and Cost Accounting tests cost behavior, product costing, budgeting, variance analysis, and short-term decisions. The exam favors calculations that require a clear cost driver or contribution-margin logic.
Cost behavior and CVP
- Variable costs change in total with activity; fixed costs are constant in total within the relevant range; mixed costs split into both.
- Contribution margin equals sales minus variable costs; unit contribution margin drives break-even and target-profit volumes.
- Break-even units = fixed costs / unit contribution margin. Target units = (fixed costs + target profit) / unit contribution margin.
- Margin of safety = budgeted or actual sales minus break-even sales, in units or currency.
Product costing and control
- Job costing suits customized output; process costing suits homogeneous continuous production.
- A predetermined overhead rate = estimated overhead / estimated allocation base. Applied overhead uses actual base; underapplied overhead is a debit balance, overapplied a credit.
- Activity-based costing assigns overhead using activities and cost drivers, reducing cross-subsidy between products.
- Variances separate price or rate effects from quantity or efficiency effects; investigate significant and controllable variances, not every difference.
Worked example
Fixed costs are 120,000; selling price is 50; variable cost is 30. Unit contribution margin is 20. Break-even is 120,000 / 20 = 6,000 units. To earn 40,000 target profit, required units are (120,000 + 40,000) / 20 = 8,000. If budgeted sales are 10,000 units, margin of safety is 4,000 units, or 40 percent of budgeted units. At 9,000 actual units, operating income is 9,000 × 20 − 120,000 = 60,000.
Traps
Treating fixed cost per unit as constant over volume is a common error. Sunk costs and allocated common costs are irrelevant to a special-order decision unless they change. Mixing up favorable and unfavorable variance signs costs marks. Using absorption cost per unit for a short-term decision can include fixed overhead that does not change. Check whether the question asks for units, currency, or percentage.