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Management Accounting · Activity Based Costing

Activity Based Management and Benefits and Limitations of ABC

Updated 10 October 2026 · Fact-checked

Activity Based Management (ABM) uses ABC information to manage activities, cut non-value-added activities and improve processes and decisions. ABC gives more accurate product costs and better cost control, but it is costly, complex and subjective. It suits firms with high overheads, diverse products and complex operations.

Understand Activity Based Management and Benefits and Limitations of ABC

Activity Based Costing (ABC) traces overheads to activities and then to products using cost drivers. It tells you what products cost. Activity Based Management (ABM) goes one step further. It uses that cost information to manage the business: to decide which activities to improve, shrink or remove.

ABM looks at activities in two groups. A value-added (VA) activity is one the customer is willing to pay for because it changes the product or service in a way the customer wants. Examples: machining a component, assembling a car, tailoring a garment. A non-value-added (NVA) activity adds cost but no value the customer cares about. Examples: storing excess inventory, moving materials between sections, rework of defective units, waiting time, repeated inspection, machine breakdown handling.

The aim of ABM is to remove or reduce NVA activities and make VA activities more efficient. Typical tools are cost driver analysis (find why the cost arises), activity analysis (list activities and their costs), and performance measurement (track cost and quality of activities). ABM supports pricing, product mix, make-or-buy, process redesign, and continuous improvement.

ABC has clear benefits: more accurate product costs, because overheads follow actual resource use; better visibility of overhead; better pricing and product mix decisions; help in identifying unprofitable products or customers; and stronger cost control since cost drivers are understood.

ABC also has limitations: it is costly and time-consuming to install and maintain; collecting driver data is hard; choosing activities and drivers is subjective; some costs (such as general administration) cannot be traced to activities and need arbitrary allocation; and results may be misleading if the system is not updated. It is most suitable where overheads are high compared with direct costs, the product range is varied, products use support activities in different proportions, and competition makes accurate costs important. It is less suitable for a firm with a single product or low overheads.

Key rules to remember

Cost driver rate
Cost driver rate = Total cost of the activity pool ÷ Total volume of the cost driver
Used to apply overheads to products in ABC, which ABM then analyses.
Cost of an activity for a product
Activity cost = Cost driver rate × Driver units used by the product
Use this to find how much NVA cost a product carries.
NVA cost share
NVA cost % = (Cost of NVA activities ÷ Total activity cost) × 100
A simple measure of the improvement potential under ABM.
Value-added test
Activity is VA only if it (a) changes the product or service, (b) the customer wants the change, and (c) it is done right the first time
If any condition fails, treat the activity as NVA.

How to solve Activity Based Management and Benefits and Limitations of ABC questions

Use this method for theory questions and short numerical questions on ABM, VA/NVA activities and ABC evaluation.

  1. 1Read the question and mark the command word: explain, distinguish, discuss, evaluate, or compute.
  2. 2For classification questions, apply the VA test to each activity: does it change the product, does the customer value it, and is it done right first time?
  3. 3Label each activity as VA or NVA with a one-line reason. Do not just give a tick.
  4. 4For numerical parts, compute the cost driver rate, then the activity cost, and total the NVA activities.
  5. 5State the ABM action: eliminate, reduce, redesign or outsource the NVA activity, and name the likely saving.
  6. 6For benefits/limitations questions, give points in two clear lists and add a closing line on suitability.
  7. 7Link your answer to the situation in the question: product range, overhead level, competition.

Quickest way: VA test plus benefit-limitation-suitability frame

When to use it: Use for 2-mark MCQs and for short 4-7 mark theory answers where time is tight.

  1. Ask: would the customer pay for this activity? If no, it is NVA.
  2. Treat storage, handling, waiting, rework, inspection and breakdown as NVA by default.
  3. For an advantages question write: accuracy, visibility, pricing, decisions, control.
  4. For a limitations question write: cost, complexity, subjectivity, arbitrary allocation, upkeep.
  5. For suitability write: high overheads, product diversity, complex operations, strong competition.
  6. Close ABM answers with one action line: cut NVA cost, improve VA efficiency.

Common mistakes in Activity Based Management and Benefits and Limitations of ABC

  • Treating all inspection and quality activities as value-added.

    Quality sounds useful, so students assume the customer pays for it.

    Fix: Inspection only checks work and does not change the product. Treat it as NVA, even if necessary in practice. Prevention activities that build quality in are better regarded as supporting improvement.

  • Confusing ABC with ABM.

    Both use activities and the terms look alike.

    Fix: ABC is a costing method that assigns overheads. ABM is a management approach that uses ABC data to improve activities and decisions.

  • Saying ABC is suitable for every business.

    Students remember only the benefits.

    Fix: State the conditions: high overheads, varied products, complex support activities. Mention that single-product or low-overhead firms gain little.

  • Listing limitations without explaining them.

    Students write one-word points to save time.

    Fix: Add a short reason to each point, for example: costly because it needs detailed data collection and system upkeep.

  • Removing an NVA activity and assuming the cost vanishes automatically.

    Students forget that costs fall only if resources are actually released.

    Fix: Say that the saving arises only when the related staff, space or machine time is reduced or redeployed.

Worked examples

Example 1

Classify the following activities of a manufacturing firm as value-added or non-value-added and give reasons: (a) machining of components, (b) storing raw materials for 60 days, (c) reworking defective units, (d) assembling the final product.

Show the solution
  1. Test (a): machining changes the material into a component the customer wants, and it is a core process. It is value-added.
  2. Test (b): storing for 60 days changes nothing in the product and the customer does not pay for it. It is non-value-added.
  3. Test (c): rework corrects a task that was not done right first time. It is non-value-added.
  4. Test (d): assembly changes the components into the finished product the customer buys. It is value-added.
  5. ABM action: reduce storage through better purchasing and cut rework through improved quality and training.

Answer: (a) VA, (b) NVA, (c) NVA, (d) VA. ABM would aim to reduce storage and rework.

Example 2

Activity costs of Shree Auto Parts for a month: machining ₹6,00,000; material handling ₹1,20,000; rework ₹80,000; assembly ₹2,00,000. Treat machining and assembly as value-added. Find the NVA cost and its percentage of total activity cost, and comment.

Show the solution
  1. Total activity cost = 6,00,000 + 1,20,000 + 80,000 + 2,00,000 = ₹10,00,000.
  2. NVA activities: material handling and rework (the question treats only machining and assembly as VA).
  3. NVA cost = 1,20,000 + 80,000 = ₹2,00,000.
  4. NVA % = 2,00,000 ÷ 10,00,000 × 100 = 20%.
  5. Comment: one-fifth of activity cost adds no customer value, so management should redesign layout and improve quality to reduce handling and rework.

Answer: NVA cost is ₹2,00,000, which is 20% of total activity cost of ₹10,00,000. Management should target these activities for reduction.

Exam tips

  • Start any VA/NVA answer with the customer test: would the customer pay for it? Then classify with a reason.
  • In a long answer, give benefits and limitations as separate bulleted lists, then add one line on suitability.
  • For MCQs, remember that storage, handling, rework, waiting and inspection are classic NVA activities.
  • In numerical questions, show the NVA total and its percentage clearly, then add a one-line ABM recommendation for step marks.
  • Do not drift into ABC product costing sums unless the question asks; link the answer to ABM and decisions.

Practice questions from Activity Based Costing

Activity Based Management and Benefits and Limitations of ABC in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Activity Based Management and Benefits and Limitations of ABC: frequently asked questions

What is activity based management in simple words?

It is the use of ABC information to manage activities. You find which activities add value, cut those that do not, and improve the rest. The result is lower cost and better decisions.

What are the main advantages and disadvantages of ABC?

Advantages are more accurate product costs, better overhead visibility, better pricing and product mix decisions, and stronger cost control. Disadvantages are high cost to set up and maintain, complexity, subjective choice of drivers, and arbitrary allocation of some costs.

Is inspection a value-added activity?

Usually no. Inspection checks the product but does not change it in a way the customer pays for. It is generally classed as non-value-added.

When is ABC suitable for an organisation?

ABC suits firms with high overheads relative to direct costs, many different products, and complex support activities. It is also useful where competition makes accurate costs and pricing important. It adds little for a single-product or low-overhead business.