Straight Line Method of Depreciation (SLM): JAIIB AFM Case Study, Formula &
The straight line method of depreciation is one of the most tested concepts in the JAIIB Accounting. Financial Management (AFM) exam. If you can solve a clean SLM case study under pressure.
You have locked in easy marks that many candidates lose to silly errors. This guide from Learning Sessions breaks the topic down completely. With the formula.
A fully solved case study. Journal entries, a comparison table, common mistakes and a quick FAQ.
Key Takeaways
- The straight line method (SLM) spreads an asset's cost evenly across its useful life.
- Annual depreciation = (Cost − Residual Value) ÷ Useful Life.
- The depreciation amount stays the same every year. Unlike the Written Down Value (WDV) method.
- SLM is favoured for assets that wear out uniformly. Such as buildings and furniture.
- JAIIB AFM almost always tests SLM through a short numerical case study.
What Is Depreciation? A Quick Refresher
Depreciation is the systematic reduction in the recorded cost of a fixed (tangible) asset over its useful life. Machines. Vehicles. Computers and furniture all lose value as they are used. Age and become outdated.
Accounting standards require firms to spread this cost across the years that benefit from the asset. This matches the expense with the revenue the asset helps generate. Which is the heart of the matching principle.
For bankers. Depreciation matters because it affects a borrower's reported profit. The value of assets shown on the balance sheet. The credit decisions built on those numbers.
What Is the Straight Line Method of Depreciation?
The straight line method of depreciation charges an equal amount of depreciation in every year of an asset's useful life. The original cost is reduced to the estimated residual (scrap) value in a perfectly even. Linear fashion.
It is also called the fixed instalment method or the original cost method. Because the charge is fixed. Is always calculated on the original cost of the asset.
Plot the asset's book value against time. You get a straight line sloping downward. Which is exactly where the name comes from.
Principal Features of SLM
- Uniform depreciation: the same rupee amount is charged every year.
- Simplicity: it is very easy to calculate, apply and audit.
- Fixed allocation: a consistent expense pattern aids budgeting and financial planning.
- Book value can reach zero: or the residual value. By the end of the useful life.
- Based on original cost: the annual charge never changes with the falling book value.
The Straight Line Method Formula
The formula for the straight line method of depreciation is short. Exam-friendly:
Annual Depreciation = (Cost of Asset − Residual Value) ÷ Useful Life of Asset
To express it as a percentage rate, use:
Rate of Depreciation (%) = (Annual Depreciation ÷ Cost of Asset) × 100
Three inputs drive every SLM question:
- Cost of asset: purchase price plus all costs to bring it into use (freight. Installation, taxes that are not refundable).
- Residual value: the estimated scrap or salvage value at the end of the useful life.
- Useful life: the number of years the asset is expected to be productive.
JAIIB AFM Case Study on the Straight Line Method
Here is a typical JAIIB-style case study. Fully solved so you can copy the method in the exam.
Problem: A bank purchases an ATM machine for Rs. 5,00,000. It spends Rs.
50,000 on installation. The machine has a useful life of 10 years. An estimated residual value of Rs.
50,000. Using the straight line method. Calculate the annual depreciation.
The rate of depreciation. And the book value at the end of Year 2.
Step 1 — Find the Total Cost of the Asset
Cost = Purchase price + Installation = Rs. 5,00,000 + Rs. 50,000 = Rs.
5,50,000. Installation is part of the cost. It is needed to make the asset usable.
Step 2 — Apply the SLM Formula
Annual Depreciation = (5,50,000 − 50,000) ÷ 10 = 5,00,000 ÷ 10 = Rs. 50,000 per year.
Step 3 — Calculate the Rate of Depreciation
Rate = (50,000 ÷ 5,50,000) × 100 = 9.09% per annum on original cost.
Step 4 — Find the Book Value at the End of Year 2
Total depreciation for 2 years = 50,000 × 2 = Rs. 1,00,000. Book Value = 5,50,000 − 1,00,000 = Rs. 4,50,000.
Year-by-Year Depreciation Schedule
| Year | Opening Value (Rs.) | Depreciation (Rs.) | Closing Value (Rs.) |
|---|---|---|---|
| 1 | 5,50,000 | 50,000 | 5,00,000 |
| 2 | 5,00,000 | 50,000 | 4,50,000 |
| 3 | 4,50,000 | 50,000 | 4,00,000 |
| ... | ... | 50,000 | ... |
| 10 | 1,00,000 | 50,000 | 50,000 |
Notice how the depreciation column never changes. After 10 years the book value equals the residual value of Rs. 50,000. That uniformity is the signature of the straight line method. Practise more numericals like this in our mock tests.
Journal Entries Under the Straight Line Method
JAIIB may ask for the accounting treatment, not just the number. The standard entries each year are:
- For charging depreciation: Depreciation A/c Dr. ... To Asset A/c (or to Provision for Depreciation A/c).
- For transferring to profit and loss: Profit & Loss A/c Dr. ... To Depreciation A/c.
When a Provision for Depreciation account is used. The asset stays at its original cost in the ledger. Accumulated depreciation builds up separately. This is the method most companies follow.
SLM vs WDV: Straight Line Method Compared
The exam loves to test the difference between the straight line method. The Written Down Value (WDV) or diminishing balance method. Keep this comparison handy.
| Basis | Straight Line Method (SLM) | Written Down Value (WDV) |
|---|---|---|
| Charge base | Original cost | Reducing book value |
| Annual amount | Same every year | Higher early, lower later |
| Book value | Can become zero | Never fully zero |
| Best suited for | Buildings, furniture, leases | Machinery, vehicles, IT assets |
| Calculation | Simple | Slightly complex |
Why the Straight Line Method Matters for Bankers
Beyond the exam. The straight line method of depreciation shows up in real banking work in three ways.
- Asset management: it ensures the systematic allocation of an asset's cost over its lifespan.
- Financial planning: a predictable, fixed expense pattern aids forecasting and reporting.
- Compliance: it aligns with accounting standards such as Ind AS 16 (Property. Plant and Equipment). Always confirm the latest applicable standard on the most recent official IIBF notification.
When you read a borrower's financials, knowing which depreciation method they used tells you how aggressive their reported profit really is. Read more such concepts in our free guides.
How to Study the Straight Line Method for JAIIB
SLM is a scoring topic if you build a tight routine. Follow this simple study plan.
- Lock the formula first: write it from memory five times until it is automatic.
- Always compute the full cost: add installation. Freight and non-refundable taxes before dividing.
- Drill timed numericals: aim to solve a case study in under three minutes.
- Make a depreciation schedule: practising the table builds speed and accuracy.
- Revise SLM vs WDV weekly: the comparison is a frequent objective question.
- Attempt full-length mock tests to simulate exam pressure.
Common Mistakes to Avoid in SLM Questions
These errors cost candidates marks every session. Eliminate them now.
- Ignoring residual value: never forget to subtract scrap value before dividing.
- Forgetting installation cost: it must be added to the asset cost.
- Confusing SLM with WDV: SLM uses original cost, WDV uses book value.
- Wrong part-year treatment: if an asset is bought mid-year. Depreciate only for the months used.
- Calculating rate on the wrong base: the SLM rate is always on original cost. Not book value.
- Rounding too early: keep full figures until the final answer.
Frequently Asked Questions (FAQ)
What is the straight line method of depreciation in simple words?
It is a method that charges the same fixed amount of depreciation every year over an asset's useful life. Calculated on its original cost. The asset's value falls in a straight. Even line until it reaches its residual value.
What is the formula for the straight line method?
Annual Depreciation = (Cost of Asset − Residual Value) ÷ Useful Life of Asset. The rate is found by dividing the annual depreciation by the original cost. Multiplying by 100.
Is SLM or WDV better for the JAIIB AFM exam?
Both are tested, so learn both. SLM is simpler and appears more often in basic numericals. While WDV tests your understanding of a reducing base. Knowing the difference between them is itself a common objective question.
Can the book value under SLM become zero?
Yes. If there is no residual value. The straight line method reduces the asset's book value all the way to zero by the end of its useful life. This is a key contrast with the WDV method. Where the value never fully reaches zero.
Why is the straight line method important for bankers?
It supports systematic asset management. Predictable financial planning and compliance with accounting standards such as Ind AS 16. For credit appraisal. The depreciation method a borrower uses directly affects their reported profit. Asset values.
Conclusion: Turn SLM Into Guaranteed Marks
The straight line method of depreciation is one of the friendliest topics in JAIIB AFM. The formula is short. The logic is clear.
And the case studies repeat the same pattern every session. Master the four-step solution. Build the schedule.
And keep the SLM vs WDV table at your fingertips.
Do that, and these are marks you simply do not miss. Stay consistent. Practise daily, and walk into the AFM paper with full confidence. Your banking career starts with conquering one concept at a time. And you have just conquered this one.
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