Straight-Line Method of Depreciation
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Lesson overview
Charging an equal amount of depreciation every year.
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Core idea (Double-Entry, Accruals & IFRS Financial Statements): Every transaction preserves Assets = Liabilities + Equity; recognise revenue when performance obligations are satisfied, not merely when cash moves.
Pacing
~40 seconds per MCQ (180 questions in 120 minutes, no negative marking).
How JAMB marks this
Fast dimensional/sign elimination and standard formula shortcuts — skip multi-line algebra when substitution tests options faster.
Watch out for
UTME distractors routinely include the intermediate value (e.g., forgetting to convert cm³ to dm³ or °C to Kelvin).
Lesson content
Introduction to Depreciation
Depreciation is the process of allocating the cost of a tangible asset over its useful life. It reflects the wear and tear, decline in value, or obsolescence of an asset. One of the most common methods of calculating depreciation is the Straight-Line Method.
Straight-Line Method of Depreciation
The Straight-Line Method of Depreciation involves charging an equal amount of depreciation expense each year over the useful life of an asset. This method is simple and widely used for its ease of calculation.
Depreciation Expense Calculation
The formula to calculate the annual depreciation expense using the Straight-Line Method is: \[ \text{Depreciation Expense} = \frac{\text{Cost of Asset} - \text{Salvage Value}}{\text{Useful Life}} \]
Worked Example
Consider a machine purchased for $20,000 with a salvage value of $2,000 and a useful life of 5 years. Using the formula: \[ \text{Depreciation Expense} = \frac{20000 - 2000}{5} = \frac{18000}{5} = 3600 \]. Therefore, the annual depreciation expense will be $3,600.
Advantages of the Straight-Line Method
The Straight-Line Method is beneficial because it provides consistency in expense allocation, making it easier for budgeting and financial forecasting. Additionally, it aligns well with the revenue generated from the asset over time.
Key Takeaways
The Straight-Line Method of Depreciation is a straightforward approach that ensures equal expense allocation over an asset's useful life. Understanding how to calculate depreciation is crucial for financial accounting and asset management.
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