Goods and Services Tax (GST) and Corporate Tax Planning · Tax Planning and Managerial Decisions

Retain, Renewal or Replacement of Asset Decision in Tax Planning

Updated 11 October 2026 · Fact-checked

A retain, renew or replace decision compares the after-tax cash flows of keeping the old asset against buying a new one. You work out the depreciation tax shield, the tax on or saving from sale of the old asset, and the running costs, then discount and compare the net cash outflows or the net present values.

Understand Retain, Renewal or Replacement of Asset Decision

A company owns an old machine. It can keep using it, spend money to renew it, or sell it and buy a new one. Each choice changes cash flows. It also changes tax, because depreciation is deductible and a sale can create a gain or a loss.

Tax enters in three places. First, depreciation on the asset reduces taxable profit, so every rupee of depreciation saves tax at the company's rate. This saving is the depreciation tax shield. Second, the sale of the old asset brings in proceeds and may change the block of assets. Third, running costs and repairs are deductible, so their real cost is only the after-tax amount.

Under the Income-tax Act, 2025, section 33 allows depreciation on buildings, machinery, plant, furniture and on specified intangibles acquired on or after 1 April 1998 (not goodwill), if owned wholly or partly by the assessee and used wholly and exclusively for business or profession. For a block of assets, depreciation is a prescribed percentage of the written down value. If an asset is used for fewer than 180 days in the year it is acquired, the deduction is restricted to 50% of the prescribed rate. Where the asset is partly used for business, only a fair proportion is allowed.

Section 33 also gives an additional deduction on new plant and machinery for manufacturers and power generators: 20% of actual cost in the year of acquisition and use. If used for fewer than 180 days, it is 10% in that year and 10% in the next year. The new plant must not have been used by any other person, in India or outside, before you installed it. It must not be installed in office premises or residential accommodation (including a guest house). It must not be an office appliance or a road transport vehicle. It must also not be an asset whose whole actual cost is allowed as a deduction in computing business income. These exclusions in section 33(8)(d) are drafted for plant other than a ship or an aircraft. The additional deduction can make replacement with new plant more attractive.

The decision rule is simple. Compare the present value of after-tax costs (or net benefits) of each option over the same period. Choose the option with the lower cost or higher net benefit. Non-tax factors such as downtime, capacity and quality matter too, but the exam expects you to show the tax effect clearly.

Key rules to remember

After-tax cost of an expense: After-tax cost = Expense × (1 − tax rate); Use for repairs, running costs and renewal costs that are revenue expenses and deductible.
Depreciation tax shield: Tax saving = Depreciation × tax rate; Depreciation is a non-cash item. Only the tax it saves is a cash flow.
Block depreciation: Depreciation = Prescribed rate × Written down value of the block; Section 33(3)(a). Halve the rate if the asset is acquired and used for fewer than 180 days in the year (section 33(4)).
Additional depreciation on new plant: Additional deduction = 20% × actual cost (10% + 10% in next year if used under 180 days); Section 33(8) and (9). Only for eligible manufacturers or power businesses and eligible new plant. Not available if the plant was used by another person before installation, is installed in office or residential premises, is an office appliance or road transport vehicle, or is an asset whose whole actual cost is allowed as a deduction. These section 33(8)(d) exclusions are drafted for plant other than a ship or an aircraft.
Terminal loss on a discarded tangible asset (power undertakings): Deduction = WDV − (moneys payable including scrap value), if written off in books; Section 33(10) applies only to assets on which depreciation was claimed and allowed under section 33(2), that is, assets of an undertaking generating or generating and distributing power, where depreciation is on actual cost. Conditions: asset sold, discarded, demolished or destroyed in a year other than the year it is first used, proceeds below WDV, and deficiency written off in books. For ordinary block assets under section 33(3), this provision does not give a separate terminal loss. The sale proceeds reduce the WDV of the block instead.
Net cash outflow of replacement: Cost of new asset − sale proceeds of old asset − tax saving on loss (or + tax on gain) − PV of depreciation shield; Compare with the PV of after-tax costs of retaining. Use the same time horizon.

How to solve Retain, Renewal or Replacement of Asset Decision questions

Use one fixed layout for every question. It keeps the tax effects visible and protects your marks.

1List the options: retain, renew, replace. Fix a common time horizon and the discount rate given.
2Find the tax rate to be used. Use the rate stated in the question; do not assume.
3For the old asset, write the written down value, the sale proceeds and any gain or loss, and state its tax effect as per the facts given.
4For each option, compute the yearly depreciation using the stated rate on WDV. Multiply by the tax rate to get the tax shield.
5Compute the after-tax running costs and repairs for each option: cost × (1 − tax rate).
6Calculate net cash flows per year, discount them at the given rate, and add the initial outlay or inflow.
7Compare total PV of net outflows (choose the lowest) or NPV (choose the highest). State the decision in one line.
8Add non-tax points briefly: downtime, capacity, technology, and conditions such as the 180-day rule.

Quickest way: Incremental after-tax comparison

When to use it: When the question gives both options with cash flows and asks only which is better.

Work only with differences between replace and retain.
Initial difference: new cost − sale proceeds of old, adjusted for tax on loss or gain.
Yearly difference: savings in operating cost × (1 − t) plus the extra depreciation × t.
Discount the differences and add them up.
If the incremental NPV is positive, replace. If negative, retain.

Common mistakes in Retain, Renewal or Replacement of Asset Decision

Treating depreciation as a cash outflow or inflow.
It appears in the profit statement, so students add it to cash flows.
Fix: Count only the tax saved: depreciation × tax rate.
Ignoring tax on repairs and running costs.
Students use pre-tax costs because the question gives them that way.
Fix: Multiply every deductible expense by (1 − tax rate) before discounting.
Applying full depreciation to an asset used for fewer than 180 days in the year of purchase.
The 50% restriction in section 33(4) is overlooked.
Fix: Check the date of use. If under 180 days, halve the prescribed rate for that year.
Claiming additional depreciation on every new asset.
Students remember the 20% figure but not the conditions.
Fix: Check the business is manufacturing or power, the plant is new, and it is not office appliances, a road transport vehicle or installed in office or residential premises.
Comparing options over different periods.
The old asset has a short remaining life and the new one a long life.
Fix: Use a common horizon, or an equivalent annual cost if the question allows it.
Forgetting the effect of the sale of the old asset on the block.
Students compute a gain or loss as if it were a single asset.
Fix: Follow the question's facts. If the asset is in a block, sale proceeds reduce the block WDV and depreciation falls in later years.

Worked examples

Example 1

A manufacturing company can retain or replace a machine. Old machine: sale value now ₹2,00,000. Annual running cost ₹1,50,000. New machine: cost ₹6,00,000, annual running cost ₹60,000. Both last 3 years. Ignore depreciation and residual values. Tax rate 25%, discount rate 10%. PV factors at 10%: year 1 0.909, year 2 0.826, year 3 0.751 (sum 2.486). Which option is better?

Show the solution

After-tax running cost, old: 1,50,000 × 0.75 = ₹1,12,500 a year.
After-tax running cost, new: 60,000 × 0.75 = ₹45,000 a year.
Yearly after-tax saving from replacing: 1,12,500 − 45,000 = ₹67,500.
PV of the savings over 3 years: 67,500 × 2.486 = ₹1,67,805.
Net initial outlay for replacement: 6,00,000 − 2,00,000 = ₹4,00,000 (tax on the sale ignored as instructed).
NPV of replacing = 1,67,805 − 4,00,000 = −₹2,32,195.
Check on a like-for-like basis. Retaining means giving up the ₹2,00,000 sale value, so its PV cost is 2,79,675 + 2,00,000 = ₹4,79,675.
Replacing costs 6,00,000 + PV of new running costs (45,000 × 2.486 = ₹1,11,870) = ₹7,11,870. The gap is 7,11,870 − 4,79,675 = ₹2,32,195, which matches the incremental NPV.

Answer: Retain the old machine. Replacing has an NPV of −₹2,32,195: the after-tax running-cost savings (PV ₹1,67,805) are less than the net outlay of ₹4,00,000.

Example 2

A company replaces a machine. New machine cost ₹10,00,000. Depreciation rate 15% on WDV, tax rate 25%, discount rate 10%. Find the PV of the depreciation tax shield for the first 2 years. Assume the machine was put to use for 180 days or more in year 1 and is the only asset in the block. PV factors: year 1 0.909, year 2 0.826.

Show the solution

Year 1 depreciation: 15% × 10,00,000 = ₹1,50,000.
Year 1 tax saving: 1,50,000 × 25% = ₹37,500.
WDV after year 1: 10,00,000 − 1,50,000 = ₹8,50,000.
Year 2 depreciation: 15% × 8,50,000 = ₹1,27,500.
Year 2 tax saving: 1,27,500 × 25% = ₹31,875.
PV of year 1 saving: 37,500 × 0.909 = ₹34,087.50.
PV of year 2 saving: 31,875 × 0.826 = ₹26,328.75.
Total PV: 34,087.50 + 26,328.75 = ₹60,416.25.

Answer: The PV of the depreciation tax shield for two years is about ₹60,416.

Exam tips

Draw a clean table: year, cash flow, tax effect, discount factor, present value. Marks follow the layout.
State your assumptions, for example that profits are enough to absorb depreciation. Section 33(11) carries forward unabsorbed depreciation but disallows it when there is a loss.
Quote section 33 conditions when they affect the answer, such as the 180-day rule and additional depreciation eligibility.
End with a one-line decision and a short non-tax comment. Examiners reward a clear conclusion.
Use the tax rate and discount rate given in the question, even if they differ from current rates.

Practice questions from Tax Planning and Managerial Decisions

Retain, Renewal or Replacement of Asset Decision: frequently asked questions

What is a retain or replace asset decision in tax planning?

It is a choice between continuing with an old asset, renewing it or buying a new one. You compare after-tax cash flows, including depreciation tax savings and the effect of selling the old asset.

Why is depreciation important in a replacement decision?

Depreciation is not a cash flow, but it reduces taxable profit. The tax saved is a real cash benefit, so a new asset with higher depreciation can be more attractive.

Does additional depreciation apply to all new machinery?

No. Under section 33(8) it applies to manufacturers and power businesses buying eligible new plant. It is not available if the plant was used by another person before installation, is installed in office or residential premises, is an office appliance or road transport vehicle, or is an asset whose whole actual cost is allowed as a deduction. These exclusions are drafted for plant other than a ship or an aircraft.

What happens if an asset is used for fewer than 180 days in the year it is bought?

Under section 33(4) the depreciation is restricted to 50% of the prescribed rate for that year. Additional depreciation, where eligible, is split 10% in that year and 10% in the next.