1. What is Cost Accounting?

Cost Accounting – Quick Revision Notes (1200+ words)

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1. What is Cost Accounting?

• Definition – The process of recording, classifying, analysing, summarising, and allocating costs associated with production to help management in decision‑making, planning, and control.
• Objectives
• Determine cost of products/services.
• Ascertain profitability.
• Assist in price fixation, cost control, and cost reduction.
• Provide data for budgeting & variance analysis.
• Facilitate managerial decision‑making (make‑or‑buy, product mix, etc.).

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2. Cost Concepts & Classification

Basis of Classification	Types	Brief Explanation
By Nature/Elements	Direct Costs – traceable to a cost object (e.g., raw material, direct labour). Indirect Costs (Overheads) – not directly traceable (e.g., factory rent, utilities).	Direct = variable in short run; Indirect = fixed/variable depending on behaviour.
By Function	Manufacturing Cost (Production) – Prime cost + Factory overhead. Administrative Cost – Office salaries, rent, depreciation. Selling & Distribution Cost – Advertising, sales commission, freight out.	Helps in preparing Cost Sheet.
By Behaviour	Fixed Cost – unchanged with activity level (e.g., rent). Variable Cost – varies proportionately (e.g., direct material). Semi‑Variable (Mixed) Cost – has both fixed & variable components (e.g., telephone bill).	Important for CVP analysis.
By Controllability	Controllable Cost – can be influenced by a responsibility centre manager (e.g., direct labour). Uncontrollable Cost – outside manager’s control (e.g., corporate taxes).	Basis of responsibility accounting.
By Time	Historical Cost – incurred in the past. Predetermined Cost – estimated before production (standard cost).	Historical used for reporting; Predetermined for planning & control.
By Association with Product	Product Cost – inventoriable (direct material, direct labour, factory overhead). Period Cost – expensed in the period incurred (selling, admin).	Product cost appears in inventory; period cost hits P&L immediately.

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3. Elements of Cost

Element	Sub‑components	Typical Treatment
Material	• Direct Material (DM) – raw material that becomes part of finished product. • Indirect Material (IM) – lubricants, cleaning supplies.	DM → Prime cost; IM → Factory overhead.
Labour	• Direct Labour (DL) – wages of workers directly engaged in production. • Indirect Labour (IL) – supervisors, maintenance staff.	DL → Prime cost; IL → Factory overhead.
Expenses (Overheads)	• Factory Overhead (FO) – indirect material, indirect labour, other factory costs (depreciation, power, rent). • Office & Administration Overhead. • Selling & Distribution Overhead.	FO added to prime cost → Factory Cost; add admin & selling overheads → Cost of Sales.

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4. Cost Sheet – Structure & Format

Particulars	Amount (₹)
Opening Stock of Raw Materials	xxx
Add: Purchases of Raw Materials	xxx
Less: Closing Stock of Raw Materials	xxx
Raw Material Consumed	xxx
Add: Direct Wages	xxx
Add: Direct Expenses (if any)	xxx
Prime Cost	xxx
Add: Factory Overheads	xxx
Works/Factory Cost	xxx
Add: Opening Work‑in‑Process	xxx
Less: Closing Work‑in‑Process	xxx
Cost of Goods Produced (Cost of Production)	xxx
Add: Opening Finished Goods Stock	xxx
Less: Closing Finished Goods Stock	xxx
Cost of Goods Sold (COGS)	xxx
Add: Administration Overheads	xxx
Add: Selling & Distribution Overheads	xxx
Cost of Sales	xxx
Add: Profit (or Loss)	xxx
Sales	xxx

Key points to remember while preparing a cost sheet:

• Opening & closing stocks are always subtracted/added for the relevant inventory (raw material, WIP, FG).
• Prime Cost = Direct Material + Direct Labour + Direct Expenses.
• Works Cost = Prime Cost + Factory Overhead.
• Cost of Production = Works Cost ± Change in WIP inventory.
• Cost of Sales = Cost of Production ± Change in FG inventory + Admin + Selling&D overheads.

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5. Methods of Costing

Method	When Used	Core Idea
Job Costing	Custom, distinct jobs (e.g., shipbuilding, printing).	Costs accumulated per job; each job gets a job card.
Batch Costing	Production in lots/batches (e.g., pharmaceuticals, biscuits).	Costs collected per batch; unit cost = batch cost ÷ batch size.
Process Costing	Continuous, homogeneous production (e.g., oil refining, chemicals).	Costs accumulated per process; unit cost = total process cost ÷ output units.
Operating Costing	Service organisations (e.g., transport, hospitals, hotels).	Cost unit = passenger‑km, bed‑day, room‑night etc.
Contract Costing	Long‑term contracts (e.g., construction, civil works).	Costs accumulated per contract; profit recognised on % completion basis.
Multiple/Composite Costing	Complex products with several components (e.g., automobiles, televisions).	Combination of job, batch, process costing for sub‑assemblies.
Uniform Costing	Same costing principles applied across several firms in an industry for comparison.	Facilitates inter‑firm benchmarking.

Mnemonic to recall methods:

Job Batch Process Operating Contract Multiple Uniform → J B P O C M U (“Just Bring Paper On Campus, My Uncle”).

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6. Standard Costing & Variance Analysis

Variance Type	Formula	Interpretation
Material Price Variance (MPV)	(Actual Price – Standard Price) × Actual Quantity	>0 → Unfavourable (paid more); <0 → Favourable.
Material Usage Variance (MUV)	(Actual Quantity – Standard Quantity) × Standard Price	>0 → Unfavourable (used more); <0 → Favourable.
Labour Rate Variance (LRV)	(Actual Rate – Standard Rate) × Actual Hours	>0 → Unfavourable (paid higher wage); <0 → Favourable.
Labour Efficiency Variance (LEV)	(Actual Hours – Standard Hours) × Standard Rate	>0 → Unfavourable (more time taken); <0 → Favourable.
Variable Overhead Expenditure Variance	(Actual Rate – Standard Rate) × Actual Hours	Similar to MPV/LRV for VOH.
Variable Overhead Efficiency Variance	(Actual Hours – Standard Hours) × Standard Rate	Similar to LEV for VOH.
Fixed Overhead Budget Variance	Actual Fixed Overhead – Budgeted Fixed Overhead	>0 → Unfavourable (overspend).
Fixed Overhead Volume Variance	(Actual Output – Budgeted Output) × Standard Fixed Overhead Rate	>0 → Favourable (higher output absorbs more FO).
Sales Price Variance	(Actual Price – Standard Price) × Actual Quantity Sold	>0 → Favourable (higher selling price).
Sales Volume Variance	(Actual Quantity – Standard Quantity) × Standard Profit per Unit	>0 → Favourable (more units sold).

Steps in Variance Analysis:

1. Set standards (price, usage, rate, time).
2. Record actual data.
3. Compute variances using formulas above.
4. Investigate significant variances (usually >5% of standard cost).
5. Take corrective action & revise standards if needed.

Mnemonic for variances: MPV, MUV, LRV, LEV, VOH‑Exp, VOH‑Eff, FOB‑Vol, FOB‑Bud, SPV, SVV → “My Pretty Little Venomous Vipers Often Fight Over Budgets, Spoiling Very Sweet Venom”.

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7. Marginal Costing & Break‑Even Analysis

• Marginal Cost = Variable cost per unit (direct material + direct labour + variable overhead + variable selling expense).
• Contribution = Sales – Variable Cost.
• Profit = Contribution – Fixed Cost.

Break‑Even Point (BEP):

• In Units = Fixed Cost ÷ Contribution per Unit.
• In Sales Value = Fixed Cost ÷ (Contribution/Sales Ratio).

Margin of Safety (MOS):

• MOS = Actual Sales – Break‑Even Sales.
• MOS% = (MOS ÷ Actual Sales) × 100.

Key Points:

• Under marginal costing, fixed costs are treated as period costs and are not absorbed into inventory.
• Useful for short‑term decision making: make‑or‑buy, acceptance of special order, product mix, shutdown point.

Mnemonic: MC → C → P (Marginal Cost leads to Contribution, which minus Fixed Cost gives Profit).

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8. Activity Based Costing (ABC)

Step	Description
1. Identify Activities	List all activities that consume resources (e.g., machine set‑up, inspection, material handling).
2. Assign Resource Costs to Activities	Determine cost drivers for each activity (e.g., number of set‑ups, inspection hours).
3. Determine Activity Cost Drivers	Choose a measure that best explains the consumption of the activity (e.g., number of purchase orders).
4. Compute Activity Rates	Activity Cost ÷ Total Driver Quantity.
5. Assign Costs to Cost Objects	Multiply activity rate by the driver quantity consumed by each product/job.
6. Analyse & Use Results	Identify high‑cost activities, opportunities for process improvement, pricing decisions.

When ABC is Preferred:

• High overhead proportion.
• Diversity of products with differing consumption of support activities.
• Need for accurate product costing for pricing or profitability analysis.

Limitations:

• More data‑intensive & costly to implement.
• Requires periodic updating of drivers.

Mnemonic: Activities Become Cost‑Drivers → ABC.

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9. Cost Control & Cost Reduction Techniques

Technique	How It Works	Typical Application
Budgetary Control	Prepare budgets, compare actuals, analyse variances, take corrective action.	All functions – production, sales, admin.
Standard Costing	Set predetermined costs; use variance analysis for control.	Manufacturing with stable processes.
Just‑In‑Time (JIT)	Reduce inventory by receiving goods only as needed; minimise holding costs.	High‑volume, repetitive industries.
Kaizen (Continuous Improvement)	Small, incremental improvements involving all employees.	Service & manufacturing.
Value Analysis/Engineering	Examine function of product/component to eliminate unnecessary cost without affecting quality.	Product design stage.
Activity Based Management (ABM)	Use ABC data to improve processes, eliminate non‑value‑adding activities.	Complex overhead environments.
Total Quality Management (TQM)	Focus on defect prevention, reduces rework & scrap cost.	Industries with high quality cost.
Outsourcing	Transfer non‑core activities to external specialists if cheaper.	Support services (IT, logistics).
Automation & Technology	Replace labour‑intensive steps with machines/CNC, reduce variable labour cost.	Mass production.
Energy Management	Monitor & optimise power usage; invest in energy‑efficient equipment.	Utilities‑intensive plants.

Quick Checklist for Cost Reduction:

• ✅ Identify cost drivers.
• ✅ Eliminate non‑value‑adding activities.
• ✅ Negotiate better supplier terms.
• ✅ Improve layout & workflow (reduce material handling).
• ✅ Train workers for multi‑skill flexibility.
• ✅ Monitor & maintain equipment to avoid breakdown losses.

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10. Reconciliation of Cost & Financial Accounts

Reason for Difference	Explanation
Stock Valuation	Cost accounts value inventory at cost (including overheads). Financial accounts may use lower of cost or market (or NRV).
Depreciation Method	Cost accounts may use straight‑line for product costing; financial accounts may follow WDV as per tax law.
Treatment of Overheads	Cost accounts absorb factory overhead into product cost; financial accounts treat them as period expenses (unless capitalised).
Abnormal Losses/Gains	Cost accounts exclude abnormal losses from product cost (written off to costing P&L). Financial accounts include them in profit/loss.
Interest & Financing Charges	Usually excluded from cost accounts (treated as period cost). Financial accounts include them in P&L.
Pre‑production Expenses	Cost accounts may capitalise them as part of product cost; financial accounts may expense immediately.
Exchange Rate Fluctuations	Cost accounts may use standard rates; financial accounts use actual rates.
Scope of Activities	Cost accounts focus on manufacturing; financial accounts cover all business activities (including investing, financing).

Reconciliation Statement (Simple Format):

Profit as per Cost Accounts          XXX
Add: Items not considered in Cost Accounts
Interest expense                 XXX
Abnormal loss (if excluded)      XXX
Difference in stock valuation    XXX
Depreciation difference          XXX
Other period costs               XXX
Less: Items considered in Cost Accounts but not in Financial Accounts
Imputed rent (if any)            XXX
Notional salaries                XXX
Profit as per Financial Accounts     XXX

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11. Important Formulas at a Glance

Concept	Formula
Prime Cost	DM + DL + Direct Expenses
Factory Cost	Prime Cost + Factory Overhead
Cost of Production	Factory Cost ± Change in WIP
Cost of Goods Sold	Cost of Production ± Change in FG
Contribution	Sales – Variable Cost
Break‑Even Units	Fixed Cost ÷ Contribution per Unit
Margin of Safety %	(Actual Sales – BEP Sales) ÷ Actual Sales × 100
Material Price Variance	(AP – SP) × AQ
Material Usage Variance	(AQ – SQ) × SP
Labour Rate Variance	(AR – SR) × AH
Labour Efficiency Variance	(AH – SH) × SR
Variable Overhead Expenditure Variance	(AVR – SVR) × AH
Variable Overhead Efficiency Variance	(AH – SH) × SVR
Fixed Overhead Budget Variance	Actual FO – Budgeted FO
Fixed Overhead Volume Variance	(Actual Output – Budgeted Output) × FO Rate
Sales Price Variance	(AP – SP) × AQ Sold
Sales Volume Variance	(AQ Sold – SQ) × Standard Profit per Unit

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12. Mnemonics & Memory Aids

Topic	Mnemonic	Meaning
Elements of Cost	M L E	Material, Labour, Expenses
Cost Sheet Order	OPEN‑P‑W‑C‑O‑S‑A‑S	Opening, Purchases, Closing → Material Consumed → + Direct Wages → + Direct Expenses = Prime Cost → + Factory Overhead = Works Cost → ± WIP = Cost of Production → ± FG = Cost of Goods Sold → + Admin + Selling = Cost of Sales → + Profit = Sales
Costing Methods	J B P O C M U	Job, Batch, Process, Operating, Contract, Multiple, Uniform
Variance Types	My Pretty Little Venomous Vipers Often Fight Over Budgets, Spoiling Very Sweet Venom	MPV, MUV, LRV, LEV, VOH‑Exp, VOH‑Eff, FOB‑Vol, FOB‑Bud, SPV, SVV
Marginal Costing	MC → C → P	Marginal Cost → Contribution → Profit
ABC Steps	A B C D E	Activities, Budget (cost) assignment, Choose drivers, Determine rates, Execute allocation
Cost Control Tools	B S J K V A T O A E	Budgetary, Standard, JIT, Kaizen, Value Analysis, ABC, TQM, Outsourcing, Automation, Energy

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13. Exam‑Focused Tips

1. Memorise the Cost Sheet layout – many JKSSB questions ask to compute missing figures (e.g., find closing stock given cost of sales).
2. Practice variance numericals – at least 2–3 problems each for material, labour, overhead, and sales variances.
3. Know when to use which costing method – scenario‑based MCQs test this (e.g., “Which method is suitable for a ship‑building yard?” → Job Costing).
4. Understand treatment of fixed vs variable costs – especially for marginal costing and break‑even analysis.
5. Recall differences between cost and financial accounts – often asked as “Which of the following is not included in cost accounts?”
6. Use the mnemonics while solving – they speed up recall under time pressure.
7. Check units – variances are in monetary terms; ensure you multiply price/rate differences by quantity/hours.
8. Watch for negative signs – a favourable variance is negative (cost less than standard) but exam may ask “Is the variance favourable or adverse?” – answer based on sign.
9. Be ready to prepare a simple reconciliation statement – 3‑4 adjustments are enough for full marks.
10. Time management – allocate ~2 minutes per MCQ, 8‑10 minutes for a problem‑sum question.

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14. Quick Reference Table – Cost Behaviour

Cost Behaviour	Graph Shape	Example	Decision Impact
Fixed	Horizontal line	Rent, salaries of supervisors	Unaffected by output level; important for shutdown decisions.
Variable	Straight line through origin	Direct material, direct labour	Changes proportionately with output; key for marginal costing.
Semi‑Variable	Starts at a fixed level, then slopes up	Telephone bill (fixed rental + usage charge)	Needs segregation (high‑low method or regression) for accurate costing.
Step Fixed	Flat steps	Supervisor salary after a certain number of workers	Relevant when capacity expands in discrete lumps.

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15. Final Recap (Bullet Form)

• Cost accounting = ascertainment, control, and decision‑making tool.
• Classify by nature, function, behaviour, controllability, time, association.
• Cost sheet follows a strict sequence: Opening stock → Purchases → Closing stock → Consumption → Direct labour/expenses → Prime → Factory overhead → Works cost → Adjust WIP → Cost of production → Adjust FG → Cost of goods sold → Admin & selling overheads → Cost of sales → Profit → Sales.
• Methods: Job, Batch, Process, Operating, Contract, Multiple, Uniform – choose based on product nature.
• Standard costing → variances (price, usage, rate, efficiency, expenditure, volume, budget).
• Marginal costing → contribution, break‑even, margin of safety.
• ABC → activities → drivers → rates → allocation → better overhead allocation.
• Cost control = budgetary control, standard costing, JIT, Kaizen, value analysis, TQM, outsourcing, automation, energy management.
• Reconciliation adjusts for stock valuation, depreciation, overhead treatment, abnormal items, interest, etc.
• Formulas & mnemonics are your best friends – revise them daily.

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End of Notes.

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