Methods of Depreciation for Bankers: JAIIB AFM Guide with Examples
For bankers preparing the JAIIB AFM paper, few topics carry as much weight in both the exam and daily branch work as depreciation. Mastering the methods of depreciation means understanding why an asset loses value, how to spread that cost across years, and how each approach changes a bank's reported profit and the book value on the balance sheet. This guide walks through the core concepts, formulas, and worked examples you need to score confidently in Accounting and Financial Management for Bankers.
What Depreciation Means in Bank Accounting
Depreciation is the systematic allocation of the cost of a tangible fixed asset over its useful life. It is a non-cash expense: no money leaves the bank when depreciation is charged, yet it reduces reported profit and the carrying value of the asset. Among the methods of depreciation tested in JAIIB AFM, all share the same goal: matching the cost of using an asset against the revenue it helps generate, following the matching principle of accounting.
Three factors drive every calculation:
- Cost of the asset, including purchase price, freight, and installation.
- Useful life, the period over which the asset is expected to be productive.
- Residual (scrap) value, the estimated amount recoverable at the end of life.
Depreciation also matters for taxation, asset replacement planning, and accurate financial statements. A banker who understands these methods can read a borrower's accounts critically, spotting whether profits are inflated by under-charging depreciation. To build a strong base on these accounting fundamentals, follow the structured syllabus in the JAIIB course, which sequences AFM topics from basic book-keeping to advanced analysis. The exam typically asks you to compute depreciation, identify the correct method, or compare book values across years.
Straight Line Method (SLM)
The Straight Line Method is the simplest and most frequently examined of the methods of depreciation. It charges an equal amount of depreciation every year over the asset's useful life, producing a straight horizontal line if plotted on a graph. It suits assets that wear out evenly, such as furniture or buildings.
Formula
Annual Depreciation = (Cost − Residual Value) ÷ Useful Life
Worked Example
A bank buys a generator for ₹5,00,000. Installation costs ₹50,000, expected residual value is ₹50,000, and useful life is 10 years.
- Depreciable cost = (5,00,000 + 50,000) − 50,000 = ₹5,00,000
- Annual depreciation = 5,00,000 ÷ 10 = ₹50,000 per year
The same ₹50,000 is charged each year until the book value reaches the ₹50,000 residual value at the end of year 10. The depreciation rate as a percentage of original cost equals 1 ÷ 10 = 10% per annum.
SLM is easy to apply and gives consistent expense figures, which helps in budgeting. Its weakness is that it ignores the reality that older assets often need higher repair costs, so total cost (depreciation plus repairs) rises over time. Reinforce SLM problems by attempting timed numerical questions on the JAIIB practice tests, where speed in computing annual charges directly improves your AFM score.
Written Down Value Method (WDV)
The Written Down Value Method, also called the diminishing balance or reducing balance method, applies a fixed percentage rate to the book value at the start of each year rather than to the original cost. Because book value falls every year, the depreciation amount also falls, charging more in early years and less later. This pattern matches assets like computers and vehicles that are most productive when new.
Formula
Depreciation for the year = Rate × Opening Book Value
Worked Example
A laptop costs ₹1,00,000 and is depreciated at 40% per annum under WDV.
- Year 1: 40% of 1,00,000 = ₹40,000; closing book value = ₹60,000
- Year 2: 40% of 60,000 = ₹24,000; closing book value = ₹36,000
- Year 3: 40% of 36,000 = ₹14,400; closing book value = ₹21,600
Notice how the charge shrinks from ₹40,000 to ₹14,400. Under WDV the book value never reaches zero exactly, which realistically reflects assets that retain some salvage value indefinitely.
Comparing the two main methods of depreciation, total depreciation over the full life is the same, but the timing differs sharply. WDV front-loads the expense, lowering taxable profit earlier, an advantage many businesses prefer. Exam questions love asking you to contrast SLM and WDV book values after two or three years, so practise both side by side. You can drill these definitions quickly using the term-matching activity at JAIIB accounting games.
Other Methods and Choosing the Right One
Beyond SLM and WDV, JAIIB AFM expects awareness of a few specialised approaches, even if they are less commonly calculated in the exam.
Units of Production Method
Depreciation is based on actual usage rather than time. Depreciation per unit = (Cost − Residual Value) ÷ Total estimated units. If a machine costing ₹4,00,000 with no scrap value can produce 2,00,000 units, the rate is ₹2 per unit; producing 30,000 units in a year gives ₹60,000 depreciation. This suits machinery whose wear depends on output.
Sum of Years' Digits Method
An accelerated method where the rate is a fraction with remaining life as numerator and the sum of the years' digits as denominator. For a 5-year asset, the denominator is 5+4+3+2+1 = 15, so year 1 charges 5/15 of the depreciable cost.
Choosing a method
- Nature of asset: evenly-used assets suit SLM; high-tech, fast-obsolescing assets suit WDV.
- Consistency: once chosen, a method should be applied consistently as per accounting standards.
- Tax and profit impact: accelerated methods reduce early profits and tax.
Banks must also follow the rates prescribed under the Companies Act and Income Tax Act. Staying current with regulatory and economic context helps; bookmark the latest IIBF and banking news and review more study guides on the iibf.store blog to connect accounting theory with real banking practice.
For authoritative guidance, refer to the official resources of the Reserve Bank of India and the Indian Institute of Banking & Finance.
Frequently Asked Questions
What is the difference between SLM and WDV methods of depreciation?
SLM charges an equal amount every year on the original cost, giving a flat expense. WDV applies a fixed rate to the reducing book value, so the charge is higher in early years and lower later. Total depreciation over the asset's life is the same, but WDV front-loads the expense, which lowers taxable profit sooner.
Why is depreciation called a non-cash expense?
Depreciation reduces reported profit and an asset's book value, but no cash actually leaves the business when it is charged. The cash outflow already happened when the asset was purchased. Depreciation simply spreads that earlier cost across the years the asset is used, following the accounting matching principle.
How important is depreciation for the JAIIB AFM exam?
Very important. Depreciation is a recurring high-yield topic in Accounting and Financial Management for Bankers. Expect numerical problems on SLM and WDV calculations, book-value comparisons, and conceptual questions on method selection. Practising worked examples and timed mock tests is the most reliable way to secure these marks.
Can a company change its depreciation method?
Yes, but only when the change gives a more accurate presentation of financial statements or is required by law or accounting standards. The change must be disclosed, and its financial effect quantified. Frequent or arbitrary changes violate the consistency principle and can distort comparability between accounting periods.
Conclusion: Lock In Your Depreciation Marks
The methods of depreciation reward steady practice: understand the cost, life, and residual value, master the SLM and WDV formulas, and learn when each applies. With these fundamentals, depreciation questions become some of the easiest marks in the AFM paper. Put your knowledge to the test with realistic, exam-style problems on the JAIIB mock tests, and structure your full preparation through the JAIIB course to move confidently from depreciation to the rest of the AFM syllabus.
Take a free mock test, download chapter PDFs, or watch a video class — all included on iibf.store.
