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Strategic Cost Management · Asset Life Cycle Costing

Life Cycle Cost Components and Cost Commitment

Updated 11 October 2026 · Fact-checked

Life cycle cost is the total cost of an asset or product from concept to disposal: acquisition, operation, maintenance and disposal. Cost commitment means early design decisions fix most of these future costs, even though cash is spent later. To solve questions, classify costs by phase, discount if asked, and compare options on total cost.

Understand Life Cycle Cost Components and Cost Commitment

Life cycle costing looks at the whole cost of an asset or product over its life, not just the purchase price. A cheap machine can be costly if it uses heavy power, needs frequent repairs or is expensive to scrap.

The main components are:
- Acquisition cost: purchase price, design, development, freight, installation, testing, training and commissioning.
- Operating cost: energy, labour, consumables, insurance and other running costs.
- Maintenance cost: routine servicing, repairs, spares and downtime losses.
- Disposal cost: dismantling, decommissioning, environmental clean-up, less any scrap or salvage value.

Now the key idea: cost incurred is when cash is actually spent. Cost committed (locked in) is when a decision fixes the cost, even though the money goes out later. Most costs are committed at the design and planning stage. Choices about materials, specifications, technology and layout decide future operating and maintenance costs. Cost incurred in that stage is usually small. So the ability to reduce cost is highest early and falls quickly as the asset moves to production and use.

This is why target costing and value engineering focus on design. Changing a design on paper is cheap. Changing it after the asset is built is expensive. Studies often say a large share of cost is committed early, but the exact share varies by industry. Do not quote a fixed figure as a rule.

Total cost of ownership (TCO) is closely related. It is usually viewed from the buyer's side: purchase price plus running, maintenance and disposal costs. Life cycle cost is broader. It can also include the supplier's or manufacturer's costs of R&D, design and development, and may cover environmental and social costs. In many questions the two are used almost alike, so follow the wording of the question.

Key rules to remember

Total life cycle cost (undiscounted)
LCC = Acquisition + Operating + Maintenance + Disposal cost
Deduct salvage or scrap proceeds from disposal cost.
Discounted life cycle cost
LCC = Acquisition cost + Σ [Running costs in year t ÷ (1 + r)^t] + PV of net disposal cost
Use when the question gives a discount rate. Acquisition cost at time 0 is not discounted.
Annuity present value
PV = Annual cost × [1 − (1 + r)^−n] ÷ r
Use for equal yearly operating or maintenance costs over n years.
Cost committed vs incurred
Cumulative % committed ≥ Cumulative % incurred in early phases
Committed cost rises early; incurred cost follows later. It is a concept, not a fixed ratio.
Equivalent annual cost
EAC = LCC (present value) ÷ Annuity factor for n years
Use to compare assets with unequal lives.

How to solve Life Cycle Cost Components and Cost Commitment questions

Use this order for any numerical or theory question on life cycle cost components.

  1. 1Read the question and note the asset, its life, the discount rate (if any) and what you must decide.
  2. 2List every cost and tag it to a phase: acquisition, operating, maintenance or disposal.
  3. 3Separate one-time costs from yearly costs. Treat salvage as a reduction in disposal cost or a cash inflow.
  4. 4Check for sunk or irrelevant costs. Include only costs that differ between the alternatives, unless total LCC is asked.
  5. 5If a discount rate is given, discount each year's cost or use an annuity factor. If not, add undiscounted amounts.
  6. 6Compute total LCC for each option. If lives differ, compute equivalent annual cost.
  7. 7For theory parts, link the answer to cost commitment: say which early decision locks in which later cost.
  8. 8State a clear recommendation with the figure that supports it, and mention non-financial factors briefly.

Quickest way: Phase-table method

When to use it: Use for comparison questions with two or three options and limited time.

  1. Draw a small table with options in columns and the four phases in rows.
  2. Fill in totals per phase, using annuity factors for repeated costs.
  3. Add the column totals and compare them.
  4. Write one line: choose the option with the lower LCC, and note that the cheaper purchase price is not the deciding factor.

Common mistakes in Life Cycle Cost Components and Cost Commitment

  • Choosing the asset with the lowest purchase price.

    Acquisition cost is visible and easy to compare.

    Fix: Always compute total LCC. Running and disposal costs can outweigh the price gap.

  • Mixing up cost committed and cost incurred.

    Both terms sound like the same thing.

    Fix: Committed means the decision fixes the cost. Incurred means cash is actually spent. Commitment comes first and is much higher early.

  • Ignoring salvage value or treating it as a cost.

    Disposal sounds like an outflow only.

    Fix: Net disposal cost = disposal expense − salvage proceeds. If proceeds exceed the expense, it is an inflow.

  • Discounting the year 0 purchase price.

    Students apply the factor to every figure by habit.

    Fix: Year 0 cash flows have a factor of 1. Discount only future costs.

  • Treating TCO and LCC as always identical.

    Textbooks use them loosely.

    Fix: Say TCO is mainly the buyer's view, while LCC can include the producer's R&D and design costs. Follow the question's scope.

  • Comparing assets with different lives on total LCC alone.

    Total looks like a fair comparison.

    Fix: Convert to equivalent annual cost before comparing.

Worked examples

Example 1

Machine X costs ₹8,00,000 to buy and install. Annual operating cost is ₹1,20,000 and annual maintenance is ₹30,000, for 5 years. Net disposal cost at the end of year 5 is ₹20,000. Machine Y costs ₹6,00,000, with annual operating cost ₹1,60,000, maintenance ₹50,000 and net disposal cost ₹40,000, over 5 years. Ignore the time value of money. Which machine has the lower life cycle cost?

Show the solution
  1. Machine X: acquisition ₹8,00,000.
  2. Operating: ₹1,20,000 × 5 = ₹6,00,000.
  3. Maintenance: ₹30,000 × 5 = ₹1,50,000.
  4. Disposal: ₹20,000.
  5. Total X = 8,00,000 + 6,00,000 + 1,50,000 + 20,000 = ₹15,70,000.
  6. Machine Y: acquisition ₹6,00,000.
  7. Operating: ₹1,60,000 × 5 = ₹8,00,000.
  8. Maintenance: ₹50,000 × 5 = ₹2,50,000.
  9. Disposal: ₹40,000.
  10. Total Y = 6,00,000 + 8,00,000 + 2,50,000 + 40,000 = ₹16,90,000.
  11. Difference = 16,90,000 − 15,70,000 = ₹1,20,000.

Answer: Machine X has the lower life cycle cost: ₹15,70,000 against ₹16,90,000 for Y. X is cheaper by ₹1,20,000 despite its higher purchase price. Choose X.

Example 2

A firm designs a product. In the design stage it spends ₹2,00,000 but this decision commits ₹14,00,000 of the total life cycle cost of ₹20,00,000. Production and use phases incur the remaining spending. Calculate the percentage of life cycle cost committed at design and explain how a 10% reduction in the design-committed cost compares with a 10% saving on the remaining cost.

Show the solution
  1. Committed at design = 14,00,000 ÷ 20,00,000 = 70%.
  2. Remaining cost not committed at design = 20,00,000 − 14,00,000 = ₹6,00,000.
  3. 10% reduction on design-committed cost = 10% × 14,00,000 = ₹1,40,000.
  4. 10% saving on the remaining cost = 10% × 6,00,000 = ₹60,000.
  5. Difference = 1,40,000 − 60,000 = ₹80,000.
  6. Cash actually spent in design is only ₹2,00,000, which is 10% of total, yet it commits 70%.

Answer: 70% of life cycle cost is committed at design. A 10% cut at design saves ₹1,40,000, against ₹60,000 from the same percentage later, so ₹80,000 more. This is why cost management effort should focus on design.

Exam tips

  • In MCQs, watch the wording: committed (locked in) and incurred (spent) are different. Pick the option that says early decisions fix most cost.
  • For numerical questions, show a phase-wise table. Marks are given for correct classification even if arithmetic slips.
  • Always add a one-line recommendation and mention one non-financial factor such as reliability or environmental impact.
  • Check whether the question asks for discounted LCC. If a rate is given, discount; if not, do not.

Practice questions from Asset Life Cycle Costing

Life Cycle Cost Components and Cost Commitment in other exams

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

Life Cycle Cost Components and Cost Commitment: frequently asked questions

What are the main components of life cycle cost?

The main components are acquisition, operating, maintenance and disposal costs. Acquisition covers purchase, installation and training. Disposal is net of any salvage value.

What is the difference between cost committed and cost incurred?

Cost committed is the cost fixed by a decision, such as a design choice, even though the cash goes out later. Cost incurred is the cash actually spent. Commitment is high in early phases while spending is low.

Is total cost of ownership the same as life cycle cost?

They are close. TCO is usually the buyer's view of purchase, running, maintenance and disposal costs. LCC is wider and can include the producer's design and development costs and environmental costs.

Do I need to discount in life cycle costing questions?

Only if the question gives a discount rate or asks for present value. Then discount all future costs and leave the year 0 cost as it is. Otherwise add the amounts directly.