Strategic Cost Analysis — Module 2: Material, Labour & Overheads Accounting

7. Materials Control Techniques

Material control is a systematic framework designed to regulate the procurement, storage, and utilization of raw materials. It aims to maintain an uninterrupted production flow while minimizing total inventory investment costs, preventing capital tie-up and stock-out bottlenecks.

Strategic Inventory Control Methodologies

• ABC Analysis (Always Better Control): An inventory classification system based on Pareto's 80/20 rule. Inventory items are tiered into three distinct categories based on their annual consumption value:
  • Category A: High-value items representing roughly 10% of total inventory quantity but commanding 70% of total monetary value. Demands strict, centralized control and low safety stock buffers.
  • Category B: Moderate-value items representing roughly 20% of inventory volume and 20% of monetary value. Requires periodic review and standard control parameters.
  • Category C: Low-value items representing roughly 70% of total inventory volume but accounting for only 10% of monetary value. Controlled via relaxed, decentralized procedures and high safety buffers.
• VED Analysis (Vital, Essential, Desirable): Evaluates inventory strictly based on the operational criticality of the material to production timelines. Vital (V) items cause immediate production stoppages if missing; Essential (E) items allow short-term operation but degrade system performance; Desirable (D) items have local substitutes and cause minimal operational friction.
• FSN Analysis (Fast, Slow, Non-moving): Classifies stock lines according to their transactional consumption velocity. It identifies obsolete or dormant materials (Non-moving) that clog physical warehouse footprints, allowing managers to execute inventory clearings.
• Economic Order Quantity (EOQ): A mathematical optimization technique that calculates the ideal volume of inventory to purchase per single order, minimizing the aggregate of Ordering Costs (clerical processing, transport setup) and Carrying Costs (storage rents, insurance, interest losses).

Where: A = Annual Consumption Volume | O = Cost per single order setup | C = Carrying cost per unit per annum

Inventory Stock Level Limits

To avoid overstocking and stock-out scenarios, cost managers set strict operational thresholds:

• Reorder Level: The specific inventory milestone that triggers a fresh procurement request.
  Reorder Level = Maximum Consumption Rate × Maximum Lead Time
• Minimum Stock Level: The safety margin below which inventory should never fall.
  Minimum Stock Level = Reorder Level - (Average Consumption Rate × Average Lead Time)
• Maximum Stock Level: The upper capacity limit to protect corporate working capital.
  Maximum Stock Level = (Reorder Level + Reorder Quantity) - (Minimum Consumption Rate × Minimum Lead Time)

8 & 9. Material Stock Verification & Methods of Pricing Material Issues

Material Issue Control & Stock Verification

Raw inventory cannot bypass factory storerooms without strict documentation. The movement is authorized via a Material Requisition Note, which acts as a formal written directive specifying the precise cost center, manufacturing job, or production process to be debited for the inventory volume issued.

• Periodic Inventory System: Physical verification is performed as a single massive operation at fixed chronological intervals (e.g., at the close of a financial year). It requires a complete production halt and makes it difficult to detect localized stock discrepancies or theft in real time.
• Perpetual Inventory System: A continuous management methodology that links regular stock record logs with an ongoing, rolling program of physical verification known as Continuous Stocktaking. A dedicated audit team reviews selected bins daily without disrupting general manufacturing workflows, ensuring immediate reconciliation of variances and fraud prevention.

Methods of Pricing Material Issues

When raw items are acquired at varying market prices over time, determining the cost of issues to a specific factory job becomes complex. Materials must be priced systematically using consistent accounting rules:

10. Labour Cost: Remuneration Systems & Incentive Premium Plans

Labour cost represents the total human resource spend incurred by an organization to convert raw materials into finished products or to support operational distribution. It is split into Direct Labour (wages directly traceable to production tasks) and Indirect Labour (support staff wages, such as supervisors and maintenance crews).

Primary Systems of Wage Remuneration

Incentive Premium Plans: Halsey and Rowan

Premium plans guarantee a base time-rate wage while offering a financial bonus for time saved against a defined standard task timeline:

• Halsey Premium Plan: Confirms a guaranteed hourly minimum wage. When a worker completes a task in less than the standard time, they receive their standard hourly wage for actual hours worked plus a bonus equal to 50% of the time saved valued at the standard hourly rate.
  Halsey Total Earnings = (T × R) + [ 0.5 × (S - T) × R ]
• Rowan Premium Plan: Similar to Halsey but uses a variable bonus calculation. The bonus is calculated as the ratio of time saved to standard time allowed, multiplied by standard earnings for actual hours worked. This protects the employer by capping bonus payouts if a worker rushes excessively.
  Rowan Total Earnings = (T × R) + [ ((S - T) / S) × (T × R) ]

Where: T = Time Taken | S = Standard Time Allowed | R = Hourly Wage Rate

Illustrative Practical Problem & Solution

11, 12, 13 & 14. Overheads: Allocation, Apportionment & Absorption

Overhead Meaning & Functional Classification

Overheads represent the aggregate of all indirect operating costs incurred by an enterprise that cannot be directly traced or economically attributed to a single product code, job contract, or cost center:

• Factory / Production Overheads: Indirect workshop expenses (plant depreciation, power utilities, supervisor salaries).
• Administration Overheads: Costs linked to corporate governance (head office rents, director fees, legal charges).
• Selling Overheads: Expenses to stimulate demand (showroom advertising, sales catalogs).
• Distribution Overheads: Logistics outlays to deliver finished goods (warehouse rents, delivery fleet upkeep).

Overhead Allocation vs Apportionment

Overhead Allocation is the process of charging the whole amount of a specific, identifiable item of indirect cost directly to a single cost center (e.g., salary of a supervisor dedicated solely to one machine shop).

Overhead Apportionment is the process of dividing a shared indirect cost across multiple departments using equitable bases:

• Primary Distribution: Spreading shared expenses across both Production Departments and Service Departments.
• Secondary Distribution: Re-apportioning accumulated Service Department overheads to Production Departments.

Overhead Absorption

Overhead Absorption is the final stage where accumulated overheads of a production department are charged to individual units of finished goods:

• Machine Hour Rate (MHR): Departmental overheads / Total machine hours (ideal for automated environments).
• Direct Labour Hour Rate: Departmental overheads / Total manual labor hours (ideal for labor-intensive environments).

Practical Problem: Primary Overhead Distribution