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Performance Management · Accounting for environmental and sustainability factors

Categories of Environmental Costs in ACCA PM

Updated 11 October 2026 · Fact-checked

Environmental costs can be grouped two ways. By nature: conventional, hidden, contingent, image and relationship, and externality costs. By purpose: prevention, appraisal, internal failure and external failure. To answer a question, identify who bears the cost, whether it is visible, and whether it occurs before or after a problem.

Understand Categories of Environmental Costs

Environmental costs are costs linked to the damage an organisation causes to the environment, and to the effort of preventing or dealing with that damage. Traditional accounting often buries them in general overheads. Managers then cannot see them or control them. Classifying them is the first step in managing them.

The first classification is by nature:

  • Conventional costs: obvious costs such as raw materials, energy and water. They are recorded, but often not seen as environmental.
  • Hidden (potentially hidden) costs: real costs that sit in overheads or are not separately tracked, such as regulatory reporting, monitoring, training and waste management staff time.
  • Contingent costs: costs that may arise in future, depending on an uncertain event, such as clean-up after a spill, fines, or compensation claims. They are uncertain in amount and timing.
  • Image and relationship costs: costs of building or protecting reputation, such as publishing environmental reports, sponsoring community projects, or winning environmental awards.
  • Externality (societal) costs: costs caused by the organisation but borne by society, such as air pollution or damage to the landscape. The firm does not pay them, so they do not appear in its accounts unless law or tax forces it.

The second classification is by purpose, and mirrors quality costing:

  • Prevention: costs of stopping damage happening, such as designing cleaner processes and staff training.
  • Appraisal: costs of checking and monitoring, such as inspections, audits and emissions testing.
  • Internal failure: costs of dealing with pollution or waste the firm has caused but contained within the organisation, such as treating waste or scrapping contaminated output.
  • External failure: costs after pollution has reached the outside world, such as clean-up, fines, compensation and lost reputation.

The two lists overlap. A fine is a contingent cost by nature and an external failure cost by purpose. Examiners often ask for one or the other, so know both and say which you are using.

Key rules to remember

Classification by nature
Conventional | Hidden | Contingent | Image and relationship | Externality
Use when the question asks what kind of cost it is or how visible it is.
Classification by purpose
Prevention | Appraisal | Internal failure | External failure
Use when the question asks about timing: before a problem, checking, or after it.
Failure test
Internal failure = pollution dealt with inside the organisation; External failure = pollution released and dealt with outside
Look at whether the damage has left the organisation.
Prevention versus failure
Higher prevention and appraisal spend usually aims to reduce failure costs
Same trade-off as the quality cost model, but not always proven to give a lower total.

How to solve Categories of Environmental Costs questions

Use this method for any question that asks you to identify, classify or discuss environmental costs.

  1. 1Read the question and note which classification is asked for: by nature or by purpose. If unclear, say which you use.
  2. 2For each cost, ask: is it already visible in the accounts? If yes, it is probably conventional. If it is buried in overheads, it is hidden.
  3. 3Ask: is it certain or does it depend on a future event? If it depends on an event, it is contingent.
  4. 4Ask: who pays? If society pays and the firm does not, it is an externality. If it protects reputation, it is image and relationship.
  5. 5For the purpose classification, ask: does it stop damage, check for damage, or deal with damage? If dealing, has the damage left the organisation (external) or not (internal)?
  6. 6Write the category, then a one-line reason linked to the facts in the scenario.
  7. 7If asked to discuss, add a comment on why the cost matters, such as improving decisions, avoiding fines or protecting reputation.

Quickest way: Three-question sort

When to use it: Use for Section A and OT case questions where you must pick a category in under a minute.

  1. Is it before, during or after the damage? Before is prevention, during checking is appraisal, after is failure.
  2. If failure: has it left the organisation? Yes is external, no is internal.
  3. For nature: spot the keyword. Future or possible means contingent. Buried in overheads means hidden. Society bears it means externality. Reputation or community means image and relationship. Materials, energy or water means conventional.

Common mistakes in Categories of Environmental Costs

  • Treating hidden and contingent costs as the same thing.

    Both are not obvious in the accounts.

    Fix: Hidden costs are real and incurred now but not separately identified. Contingent costs may or may not arise in future.

  • Calling a cost of cleaning waste inside the factory an external failure cost.

    Students link any clean-up with external failure.

    Fix: Internal failure is damage dealt with before release. External failure applies when pollution has reached outsiders or the environment.

  • Saying externality costs are paid by the company.

    The word cost suggests the firm pays.

    Fix: Externalities are borne by society. They only enter the firm's accounts if a tax, fine or law makes the firm pay, and then they are usually classed differently.

  • Putting environmental audits under prevention.

    Audits feel like a way to avoid problems.

    Fix: Checking and monitoring is appraisal. Prevention is designing the process or training so the problem does not occur.

  • Listing categories without applying them to the scenario.

    Students recall definitions and stop.

    Fix: Name each item in the scenario, give its category and say why in one sentence.

  • Treating image and relationship costs as pure waste.

    They have no direct output.

    Fix: Explain that they support reputation, customer loyalty and licence to operate, though benefits are hard to measure.

Worked examples

Example 1

A chemical company incurs these costs: (1) ₹8,00,000 a year of staff time on environmental regulatory reporting, absorbed in general overheads; (2) possible compensation if a storage tank leaks in future; (3) sponsoring a local river clean-up and publishing a sustainability report; (4) air pollution from its chimney, harming nearby residents, for which it pays nothing. Classify each by nature.

Show the solution
  1. Item 1 is real and incurred now but not separately identified, buried in overheads. This is a hidden cost.
  2. Item 2 depends on an uncertain future event and its amount is unknown. This is a contingent cost.
  3. Item 3 aims to protect or improve reputation and community relations. This is an image and relationship cost.
  4. Item 4 is caused by the company but borne by residents and society. This is an externality cost.

Answer: 1 hidden; 2 contingent; 3 image and relationship; 4 externality.

Example 2

A manufacturer spends: (a) ₹5,00,000 redesigning a process to produce less toxic waste; (b) ₹2,00,000 on monthly emissions testing; (c) ₹3,00,000 treating waste on site before disposal; (d) ₹12,00,000 on fines and clean-up after a discharge into a river. Classify each using prevention, appraisal, internal failure and external failure, and state total failure costs.

Show the solution
  1. (a) Redesign stops damage occurring, so prevention.
  2. (b) Testing checks for problems, so appraisal.
  3. (c) Waste has been created but is treated inside the organisation before release, so internal failure.
  4. (d) Pollution reached the river and the firm pays fines and clean-up, so external failure.
  5. Total failure costs = internal ₹3,00,000 + external ₹12,00,000 = ₹15,00,000.
  6. Prevention plus appraisal = ₹5,00,000 + ₹2,00,000 = ₹7,00,000. Comment: more spending on prevention could reduce the ₹15,00,000 of failure costs.

Answer: (a) prevention; (b) appraisal; (c) internal failure; (d) external failure. Total failure costs are ₹15,00,000.

Exam tips

  • Check whether the question wants classification by nature or by purpose. Mixing them loses marks.
  • In written answers, define the category in a few words, then tie it to the scenario item. Evidence from the scenario earns the marks.
  • Remember that one cost can fit both lists, such as a fine being contingent and external failure. Say which you are using.
  • For OT questions, use keywords: possible or future means contingent, buried in overheads means hidden, society bears it means externality.
  • If asked why classifying matters, mention visibility, better decisions, control of hidden costs and reduction of failure costs.

Practice questions from Accounting for environmental and sustainability factors

Categories of Environmental Costs in other exams

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

Categories of Environmental Costs: frequently asked questions

What is the difference between hidden and contingent environmental costs?

Hidden costs are actual costs the firm incurs now but does not separately identify, as they sit in overheads. Contingent costs may arise in future depending on an uncertain event, such as a clean-up after an accident.

What are the four environmental cost categories of prevention, appraisal, internal failure and external failure?

Prevention costs stop damage occurring. Appraisal costs monitor and check. Internal failure costs deal with waste or pollution inside the organisation. External failure costs arise after pollution reaches the outside world.

Are externality costs included in a company's accounts?

Usually not, because society bears them. They enter the accounts only when a tax, fine, charge or legal liability makes the company pay.

Which classification should I use in the PM exam?

Use the one the question asks for. If the question just says classify environmental costs, state which basis you are using, and you may mention the other briefly.