Strategic Cost Management · Decisions involving Alternative Choices

Relevant Costing and Decision-Making Framework for CMA Final

Updated 11 October 2026 · Fact-checked

Relevant costing means using only future cash flows that differ between alternatives. To solve a question, list each alternative, drop sunk and committed costs, include opportunity costs and avoidable costs, drop non-cash items, compare the incremental figures, and recommend the better option with a short reason.

Understand Relevant Costing and Decision-Making Framework

Every short-term decision compares two or more alternatives: make or buy, accept or reject an order, continue or shut down. The only question that matters is: what will change in the future if I choose this option? Costs and revenues that change are relevant. Everything else is noise.

A relevant cost is a future cash cost that differs between alternatives. An irrelevant cost is one that stays the same whichever option you pick, or one that has already been incurred. Your accounts may show a cost, but that does not make it relevant.

A sunk cost is already spent and cannot be recovered by any choice, such as money paid last year for a machine or for market research. It is always irrelevant. A committed cost is a future cost you must pay anyway under an existing contract. It is also irrelevant, because it does not differ between options.

An opportunity cost is the benefit you give up by choosing one option over the next best use of the resource. It is relevant even though no cash is paid out. For example, if a machine used for a new job could otherwise be hired out for ₹40,000, that ₹40,000 is a cost of the job. An avoidable cost is one that disappears if you drop the activity, such as a supervisor's salary for a product line you close. It is relevant. An unavoidable cost continues regardless, and is irrelevant.

Other points follow from this. Depreciation is a non-cash allocation of a past cost, so it is irrelevant. Fixed overhead absorbed on a rate is relevant only if the total fixed cost actually changes. Material already in stock is relevant at its replacement cost if it will be replaced, or at its resale value or best alternative use if it will not. Qualitative factors, such as customer goodwill and capacity, can still change the final recommendation.

Key rules to remember

Relevant cost rule: Relevant cost = future + cash (or cash-equivalent) + differs between alternatives; A cost must pass all three tests. Failing any one makes it irrelevant.
Relevant cost of a resource: Relevant cost = cash outlay + opportunity cost; Cash outlay is the extra spending caused by the decision. Opportunity cost is the contribution or value lost from the next best use.
Relevant cost of material in stock: Not needed again: higher of resale value and value in alternative use. Needed again: current replacement cost; The original purchase price is a sunk cost and is ignored.
Relevant cost of labour: Spare capacity (idle paid labour): nil. Fully used: wages + contribution lost per hour × hours; Contribution lost applies when labour is diverted from other work. For extra hours paid at a premium, use the premium rate.
Incremental analysis: Incremental profit = Incremental revenue − Incremental (relevant) cost; Choose the alternative with the higher incremental profit, or the lower relevant cost when revenue is the same.
Avoidable fixed cost test: Include a fixed cost only if it is saved or newly incurred by the decision; Allocated head-office or common costs that continue are irrelevant.

How to solve Relevant Costing and Decision-Making Framework questions

Use this sequence for any relevant costing question, whether it is a make or buy, a special order, a shutdown or a resource-use problem.

1State the decision and list the alternatives clearly, including the option of doing nothing.
2Underline what is already spent or committed: sunk costs, past purchase prices, existing contracts. Cross them out.
3Sort each remaining item as future or not, and cash or not. Cross out depreciation, absorbed overhead that does not change, and allocated common costs.
4Check for each item whether it differs between the alternatives. Items equal in all options are irrelevant even if they are future cash costs.
5Add the opportunity costs: contribution or sale value lost from the best alternative use of any scarce resource, such as capacity, stock material or key labour.
6Compute the relevant cost or incremental profit of each alternative in a neat table or a short list.
7Compare and recommend. Say which option is better and by how much.
8Add one or two qualitative points, such as capacity, supplier reliability, or customer relations, and note any assumptions you made.

Quickest way: Three-question filter

When to use it: Use it when a problem lists many figures and you have limited time. It is useful for MCQs and for scanning case data.

For each figure ask: Is it in the future? If no, strike it out (sunk).
Ask: Does it change with the decision? If no, strike it out (committed or unavoidable).
Ask: Is it cash or a real loss of benefit? If it is only an accounting allocation, strike it out.
Add any opportunity cost not shown in the data, such as hire income or alternative contribution, then total what remains.
Write the recommendation in one line with the figure difference.

Common mistakes in Relevant Costing and Decision-Making Framework

Including depreciation or the original cost of stock material in the relevant cost.
These figures appear in the cost sheet and look like costs of the job.
Fix: Depreciation is non-cash and past-based. Stock material is valued at replacement cost or best alternative use, never at its purchase price.
Ignoring opportunity cost because no cash is paid.
Students link relevance only with cash outflows.
Fix: Whenever a resource has another use, such as hiring out, resale, or use on another product, add that lost benefit as a cost of the chosen option.
Treating absorbed fixed overhead as relevant.
The question gives a per-unit cost that includes overhead, and students use it directly.
Fix: Split the cost into variable and fixed. Include fixed cost only if the total changes because of the decision.
Treating all fixed costs as irrelevant.
Students over-learn that fixed costs do not matter.
Fix: Avoidable fixed costs, such as a supervisor who is made redundant or new rent incurred, are relevant. Test every fixed cost for whether it is saved or added.
Charging idle labour wages to a new job.
Wages look like a cost per hour for every hour worked.
Fix: If workers are paid anyway and have idle time, the relevant cost of using that time is nil. Charge wages only when extra payment or diverted contribution arises.
Giving figures without a recommendation.
Students end the answer after the calculation.
Fix: Always close with a clear decision, the amount of benefit, and one qualitative factor.

Worked examples

Example 1

Sundaram Engineering has received an enquiry for a one-off job. It needs 500 kg of Material X. The firm holds 500 kg bought earlier at ₹120 per kg. The current replacement price is ₹150 per kg, and the material has no other use except being sold as scrap at ₹90 per kg. The material was originally bought for a job that has since been cancelled and the firm will not buy more of it. What is the relevant cost of Material X for the new job?

Show the solution

The purchase price of ₹120 per kg is a sunk cost, so ignore it.
The firm will not replace the material for other work, so the replacement cost of ₹150 is not the relevant measure.
The best alternative use is sale as scrap at ₹90 per kg. Using it in the job means this ₹90 is lost.
Relevant cost = 500 kg × ₹90 = ₹45,000.

Answer: The relevant cost of Material X is ₹45,000, the scrap value forgone.

Example 2

Bharat Plastics is considering a special order for 2,000 units at ₹260 per unit. Variable cost is ₹180 per unit. Fixed overhead absorbed is ₹40 per unit, but total fixed cost will not change. Spare capacity is available. Accepting the order needs a one-time die costing ₹30,000, which has no other use. Should the firm accept the order?

Show the solution

Fixed overhead of ₹40 per unit is irrelevant because total fixed cost does not change.
Incremental revenue = 2,000 × ₹260 = ₹5,20,000.
Incremental variable cost = 2,000 × ₹180 = ₹3,60,000.
The die of ₹30,000 is a new future cash cost caused by the order, so it is relevant.
Incremental profit = ₹5,20,000 − ₹3,60,000 − ₹30,000 = ₹1,30,000.
The profit is positive and capacity is spare, so there is no opportunity cost.

Answer: Accept the order. It adds ₹1,30,000 to profit. Check that regular customers will not demand the same price.

Exam tips

In case-based MCQs, read the data line by line and cross out sunk, committed and non-cash items before you calculate.
In written answers, show a short working note for each relevant cost, with a reason for items you exclude. Markers give credit for the reasoning.
Watch for hidden opportunity costs: spare machine hire, scarce material, labour diverted from other work, and stock material with a scrap or resale value.
Always end with a recommendation and one qualitative factor. A calculation without a decision loses marks.
Check the wording on fixed cost: if the question says the cost is avoidable, specific, or will be incurred, treat it as relevant.

Practice questions from Decisions involving Alternative Choices

Relevant Costing and Decision-Making Framework in other exams

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

Relevant Costing and Decision-Making Framework: frequently asked questions

What is the difference between sunk cost and opportunity cost?

A sunk cost is money already spent that cannot be recovered, so it is irrelevant to the decision. An opportunity cost is the benefit you give up by using a resource in one way instead of its next best use, so it is relevant. Sunk cost looks backward. Opportunity cost looks forward.

Is fixed cost always irrelevant in decision making?

No. Fixed cost is irrelevant only if it stays the same whichever option you choose. If a fixed cost is saved, such as a supervisor's salary on closing a line, or newly added, such as extra rent, it is relevant.

How do I find the relevant cost of material already in stock?

Ignore the purchase price. If the material will have to be replaced for other work, use the current replacement cost. If it will not be replaced, use the higher of its resale value and the value from its best alternative use.

Are qualitative factors part of relevant costing?

They are not part of the numerical calculation, but they can change the final decision. Examples are customer goodwill, supplier reliability, employee morale and effect on regular prices. Mention them briefly after your calculation.