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Straight Line Method (SLM) of Depreciation

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Nupur Wankhede

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Introduction to the Straight Line Method

The Straight Line Method (SLM) is one of the most commonly used techniques for calculating depreciation, where the asset's value is evenly distributed over its useful life. This method is widely employed in accounting due to its simplicity and predictability. Understanding the SLM helps businesses in financial planning, reporting, and tax compliance.

How the Straight Line Method Works

Under the SLM, depreciation expense remains constant over the asset's useful life. The method assumes that the asset will depreciate evenly, reflecting its steady usage. The total cost of the asset, minus its salvage (or residual) value, is divided equally over the number of years the asset is expected to be in service.

The key components considered in the calculation are:

  1. Cost of the Asset: The initial purchase price of the asset.

  2. Salvage Value: The projected value of the asset remaining after its useful life has ended.

  3. Useful Life: The period during which the asset is expected to be useful to the business.

Straight Line Method Formula

The formula used to calculate depreciation using the Straight Line Method is as follows:

Depreciation Expense = (Cost of Asset – Salvage Value) ÷ Useful Life

Example Calculation:

For an asset that costs ₹10,000, has a salvage value of ₹1,000, and a useful life of 5 years:

Depreciation Expense = (₹10,000 – ₹1,000) ÷ 5 = ₹1,800 per year.

This means that ₹1,800 will be deducted from the asset’s book value each year for five years.

Why the Straight Line Method is Important

The SLM is crucial for businesses because it offers predictability and simplicity in depreciation reporting. This makes it easier for businesses to forecast expenses over time, ensuring smooth budgeting and financial planning. The consistency of depreciation under the SLM is suited for assets that are used uniformly over their life span, such as office buildings or furniture.

Moreover, the method ensures that businesses remain compliant with accounting standards, as it is widely accepted under both Generally Accepted Accounting Principles (GAAP) and International Financial Reporting Standards (IFRS).

Straight Line Method vs. Written Down Value Method

The table below highlights the key differences between the Straight Line Method and the Written Down Value Method. This comparison will help you understand which method is more suited for different types of assets.

Aspect Straight Line Method Written Down Value Method

Depreciation Calculation

Equal depreciation every year

Higher depreciation in earlier years

Depreciation Pattern

Uniform over asset’s life

Accelerated in early years

Expense Uniformity

Consistent annual expense

Varies, higher in early years

Asset Suitability

Suitable for assets with consistent usage

Suitable for assets with variable usage

Key Differences:

  • Depreciation Pattern: The SLM allocates equal depreciation across the asset’s life, while the Written Down Value Method accelerates depreciation, particularly in the initial years.

  • Expense Consistency: SLM provides predictable and uniform expense reporting, which supports consistent financial planning and accounting.

  • Asset Applicability: The SLM is suited for assets with consistent wear and tear over time, while the Written Down Value Method is suited for assets that lose value more rapidly in their early years.

Advantages of the Straight Line Method

The Straight Line Method offers several advantages, including:

  • Simplicity: The method is easy to understand and implement, requiring minimal calculations.

  • Predictability: Depreciation expense is consistent every year, which helps businesses with budgeting and long-term financial planning.

  • Financial Reporting: The method ensures straightforward and uniform reporting of depreciation, which is beneficial for internal financial management and external audits.

Wide Acceptance: The SLM is recognised and accepted under most accounting standards globally, making it one of the most widely adopted methods.

Disadvantages of the Straight Line Method

While the Straight Line Method is popular for its simplicity, it has some drawbacks:

  • Inaccurate Reflection of Wear and Tear: The method assumes that an asset depreciates at a constant rate, which may not reflect its actual usage or wear and tear, especially for assets that depreciate faster in the early years.

  • Less Suitable for Technological Assets: Assets such as computers or machinery, which lose value more quickly due to technological obsolescence or rapid usage, may not be accurately represented by the SLM.

  • Ignores Potential Accelerated Depreciation: The SLM does not account for the possibility of accelerated depreciation due to high usage or unexpected wear.

Conclusion

The Straight Line Method remains a widely used and straightforward approach to calculate depreciation, making it suitable for assets that experience uniform usage. However, businesses must consider their specific asset characteristics before choosing a depreciation method. In cases where asset usage varies or accelerates, alternative methods like the Written Down Value Method may provide a more accurate reflection of depreciation.

Disclaimer

This content is for informational purposes only and the same should not be construed as investment advice. Bajaj Finserv Direct Limited shall not be liable or responsible for any investment decision that you may take based on this content.

FAQs

How is the straight line method different from the reducing balance method?

The Straight Line Method provides equal depreciation every year, while the Reducing Balance Method results in higher depreciation in the earlier years of an asset's life.

SLM is most suitable for assets that have a consistent pattern of usage, such as office furniture, buildings, and vehicles that do not experience rapid wear and tear.

It is called the fixed installment method because it applies the same depreciation expense each year, providing a fixed "installment" of depreciation over the asset's useful life.

Yes, SLM is permitted under the Companies Act, 2013. For Income Tax, depreciation generally follows WDV, except for power generation undertakings where SLM applies.

Assets with predictable wear and tear, such as office equipment, furniture, and buildings, are typically suited for the Straight Line Method, as they depreciate at a uniform rate.

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Hi! I’m Nupur Wankhede
BSE Insitute Alumni

With a Postgraduate degree in Global Financial Markets from the Bombay Stock Exchange Institute, Nupur has over 8 years of experience in the financial markets, specializing in investments, stock market operations, and project management. She has contributed to process improvements, cross-functional initiatives & content development across investment products. She bridges investment strategy with execution, blending content insight, operational efficiency, and collaborative execution to deliver impactful outcomes.

Academy by Bajaj Markets

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