October 10, 2025
4 mins read
The Straight Line Method (SLM) calculates depreciation by reducing an asset’s value evenly over its useful life, making financial records simple and predictable. The article explains how depreciation works, how SLM is calculated with examples, and how it compares with other methods. It also covers its relevance for investors, advantages like clarity, and limitations such as ignoring usage, helping readers understand its practical role in financial analysis.
Things we own tend to lose value over time, whether we notice it or not. This steady decline matters to organisations that use machines, tools, and buildings every day. The Straight Line Method helps them record this loss clearly and consistently.
The Straight Line Method simply reduces an asset’s value at the same pace each year, and many people like it for that reason. It feels a bit like following a steady routine, where the same amount is accounted for year after year, which makes the whole process easier to keep track of during an asset’s life.
Because the cost is shared out evenly, the numbers are easier to read and the records feel more open and straightforward. The Straight Line Method also helps teams plan without getting lost in complicated adjustments. That steady approach is why so many businesses rely on it to understand how their assets lose value over time.
Depreciation refers to the gradual drop in an asset’s value as it is used, ages, or becomes outdated. Businesses record this decline to understand how their assets change over time and to distribute the cost across the asset’s entire useful life in a structured way.
This helps companies keep their financial records accurate and realistic. It also ensures that the expense of owning equipment, vehicles, or machinery is not shown all at once but spread out smoothly over several years as the asset continues to serve its purpose.
For instance, if someone buys a car for a large amount, its value will naturally fall after years of use. Depreciation captures that decrease in a clear and predictable manner.
Let's talk about it in real life. When a business buys anything, like a delivery vehicle, it pays a particular amount up front. But the van won't endure forever. For example, it may work well for eight years. After that, it would not be worth much to sell or shred.
The corporation now uses the straight-line technique to evenly divide the difference between the purchase of the van and its eventual estimated worth over the course of eight years. That yearly amount is the value that goes down. The corporation writes down the van's value by that certain amount every year.
This method requires that the item be used in a steady and consistent fashion. It doesn't take into consideration any sudden increases in use or wear and tear. But for a lot of things, like buildings, office equipment, or regular cars, it delivers a good image.
For example, a business buys a desktop computer for ₹3,00,000. The computer should last for five years. The business thinks it can sell the PC for ₹50,000 after those five years. This is the leftover value, which is ₹50,000.
Here's how the straight-line approach works now:
First, take the purchase price and deduct the residual value. So ₹3,00,000 minus ₹50,000 is ₹2,50,000.
Then, divide ₹2,50,000 by five, which is the number of usable years.
You now make ₹50,000 a year. The PC will lose this much value per year. So every year, the corporation would write off ₹50,000 from the asset's value in its books.
The records will show that the asset is worth ₹50,000 by the end of year five, just as planned.
There are no abrupt shocks or changes that are hard to forecast; thus, it is a straightforward and organised approach to show how the asset ages.
Why do corporations and accountants even bother with depreciation? Also, why employ the straight-line approach when there are alternative ways to do it?
The quick answer is that it is clear. It doesn't make sense to charge the whole price for one year when a business buys a long-term asset. That would make the profit seem considerably smaller in the year of purchase and overly large in the years after that. Depreciation divides the expense in a fair and reasonable way.
The straight-line technique is especially significant because it:
Basically, SLM makes sure that asset costs are managed in a fair way over time.
While the Straight Line Method is simple and widely used, it is not the only way to calculate depreciation. Different methods suit different types of assets, so it helps to compare them side by side.
Depreciation Method | Depreciation Rate | Best Suited For | Complexity | Explanation |
Straight Line Method (SLM) | Same amount every year | Assets used consistently over time | Easy | SLM reduces value evenly each year. It does not change with usage or wear. Ideal for assets like buildings, cabinets, or storage units that perform at a steady level annually. |
Written Down Value (WDV) Method | Higher in early years, lower in later years | Assets that lose value quickly | Moderate | WDV applies more depreciation at the start and less later. It works well for items like phones, laptops, or software that decline fast in value when new. |
Units of Production Method | Based on actual usage or output | Factories, vehicles, machinery | Complex | Depreciation is linked to how much the asset is used. For example, a printing machine loses value depending on the number of pages printed in a year. |
The Written Down Value (WDV) Method is commonly used in India for tax purposes because it allows higher depreciation in the early years. The Straight Line Method, however, remains the preferred choice for assets that offer steady and consistent usage over time.
If you invest in Indian firms, you may not directly calculate depreciation, but you will see it. When you read yearly reports or financial figures, especially.
Knowing how to use the straight-line approach might help you better understand how profitable a business is. If you find that the value of the firm goes down every year, it's likely that they are utilising SLM. That implies you should anticipate fixed assets to have a predictable influence on their net profit.
Also, when you want to compare two organisations in the same field, it's helpful to know what approach they utilise. If one company utilises SLM and the other employs a decreasing balance technique, their earnings may seem different, even if they do the same things.
As an investor, SLM may seem like a small issue that happens behind the scenes, but it has a big effect on the financial picture you see.
Additional Read: What is Amortisation
Additional Read: What is Deferred Tax Liability
Disclaimer: This article is for informational purposes only and does not constitute investment advice. Bajaj Broking Financial Services Ltd. (BFSL) makes no recommendations to buy or sell securities.
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Indian accounting rules do allow the straight-line technique. The Companies Act, 2013, and Indian Accounting Standards both say that fixed assets can lose value over time.
SLM works best with assets that lose value in a consistent, predictable fashion. This includes things like office furniture, computers, buildings, and manufacturing equipment that can be used for a long period without being too worn out.
The biggest problem is that it implies that wear is the same every year, which may not be true in real life. SLM doesn't realistically take into account that many assets lose greater value in the first several years.
SLM causes the depreciation cost to be the same every year, which makes the effect on firm profitability less noticeable. This might help make reported earnings more consistent, but it cannot show the full cost of assets that are getting old quickly or are being utilised a lot.
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