Costing methods: Accounting Notes for CA Final

Costing Methods – CA Final (Accounting)

(Comprehensive, exam‑oriented study notes with derivations, key formulae, tricky points and a hard practice question)

1. Introduction to Costing

Term	Definition
Cost	Amount expended to acquire or produce a product/service.
Costing	Systematic process of measuring, recording, classifying, summarizing and allocating costs for decision‑making.
Purpose	• Pricing decisions • Control & efficiency • Performance evaluation • Financial reporting

Exam Tip: The Board often asks “Explain the significance of costing in management accounting.” Start with the above definition and then discuss the three main objectives.

2. Cost Classification (For CA Final)

Dimension	Categories
By Nature	Direct (materials, labour) vs. Indirect (overheads)
By Function	Production, Selling & Distribution, Administrative
By Behavior	Fixed, Variable, Mixed
By Extent of Control	Direct vs. Allocated
By Timing	Actual vs. Standard

Tricky Point: In the Income Statement under Absorption Costing all manufacturing costs (direct + allocated overhead) are part of Cost of Goods Sold (COGS). Under Variable Costing, only variable manufacturing costs are included in COGS.

3. Cost Flow Assumptions (Inventory Valuation)

Assumption	Definition	Effect on COGS	When used
FIFO	First‑in, first‑out	COGS uses oldest costs → Lower COGS in inflation → Higher profit	Often used for perishable goods
LIFO	Last‑in, first‑out	COGS uses newest costs → Higher COGS in inflation → Lower profit	Not permitted under IFRS (use FIFO)
Weighted Average	Average cost of all units available	Smooths price fluctuations	Default when no other method is chosen

Exam Note: CA Final may ask you to compute ending inventory using each method. Be ready to show the formulas:

Average Cost per Unit = Total Cost of Goods Available for Sale ÷ Total Units Available
COGS   = Average Cost per Unit × Units Sold
Ending Inventory Value = Average Cost per Unit × Units in Ending Inventory

4. Costing Methods

Method	When Used	Key Features	Typical Formulae
Actual Costing	Any production	Uses actual cost data for direct materials, direct labour, and overhead	COGS = Σ (Actual Material + Actual Labour + Actual Overhead)
Standard Costing	Large‑scale manufacturing	Predetermined standard costs for materials, labour & overhead. Variances are analysed	See § 5
Activity‑Based Costing (ABC)	Complex cost structures	Traces overhead to activities (cost drivers). Reduces cost distortion	Overhead Absorption Rate = Total Overhead ÷ Total Cost Driver Units
Job Costing	Customised products/Projects	Cost per job/contract. All costs assigned to a job.	Job Cost = Direct Materials + Direct Labour + Applied Overheads
Process Costing	Homogeneous production	Continuous processes; costs accumulated by department or process.	Unit Cost = Total Cost of a Process ÷ Units Produced

5. Standard Costing – In‑Depth

5.1. Standard Cost Sheet (SCS)

Component	Description	Example
Direct Materials	Standard price × standard quantity	₹50 × 10 kg = ₹500
Direct Labour	Standard rate × standard hours	₹30 × 5 h = ₹150
Manufacturing Overhead	Rate (fixed + variable) × Standard hours	₹20 × 5 h = ₹100
Total Standard Cost	Sum of above	₹750

Derivation of Standard Cost
Standard cost = (Standard price × Standard quantity) + (Standard rate × Standard hours) + (Standard overhead rate × Standard hours).

5.2. Variance Analysis

Variance	Formula	Interpretation
Direct Material Price Variance (DMPV)	[(AP – SP) × AQ]	AP = Actual price, SP = Standard price, AQ = Actual quantity
Direct Material Usage Variance (DMUV)	[(AQ – SQ) × SP]	SQ = Standard quantity
Direct Labour Rate Variance (DLRV)	[(AR – SR) × AH]	AR = Actual rate, SR = Standard rate, AH = Actual hours
Direct Labour Efficiency Variance (DLEV)	[(AH – SH) × SR]	SH = Standard hours
Variable Overhead Efficiency Variance (VOEV)	[(AH – SH) × VO]	VO = Variable overhead rate
Variable Overhead Spending Variance (VOSV)	[(VOactual – VO) × AH]
Fixed Overhead Volume Variance (FOVV)	[(SH – AH) ×