Depreciation Methods Explained Simply:
Assets like machinery and vehicles lose value over time, and accounting has specific methods to track exactly how. This guide has depreciation methods explained simply, covering the three most commonly taught approaches with clear worked examples.
What Is Depreciation?
Depreciation is the process of allocating the cost of a fixed asset over its useful life, rather than recording the entire cost as an expense in the year it was purchased.
This topic is part of the FA curriculum at UCP, usually introduced after students understand the basics of fixed assets and the income statement.
Why Depreciation Matters
Without depreciation, buying a Rs. 500,000 machine would create a massive one-time expense, distorting that year’s profit. Depreciation spreads this cost more accurately across the years the machine is actually used.
1. Straight-Line Depreciation
This method spreads the cost evenly across the asset’s useful life.
Formula: (Cost − Salvage Value) ÷ Useful Life
Example: A machine costs Rs. 100,000, has a salvage value of Rs. 10,000, and a useful life of 9 years.
Annual Depreciation = (100,000 − 10,000) ÷ 9 = Rs. 10,000 per year
2. Declining Balance Method
This method applies a fixed percentage to the asset’s remaining book value each year, resulting in higher depreciation in early years and lower depreciation later.
Example: A machine costs Rs. 100,000, and the business uses a 20% declining balance rate.
- Year 1: 100,000 × 20% = Rs. 20,000
- Year 2: (100,000 − 20,000) × 20% = Rs. 16,000
- Year 3: (80,000 − 16,000) × 20% = Rs. 12,800
Notice how the depreciation amount decreases each year as the book value shrinks.
3. Units of Production Method
This method ties depreciation directly to actual usage rather than time.
Formula: [(Cost − Salvage Value) ÷ Total Estimated Units] × Units Produced This Year
Example: A machine costs Rs. 90,000, has a salvage value of Rs. 10,000, and is expected to produce 40,000 units over its life. In Year 1, it produces 8,000 units.
Depreciation per unit = (90,000 − 10,000) ÷ 40,000 = Rs. 2 per unit
Year 1 Depreciation = 8,000 × Rs. 2 = Rs. 16,000
Comparing the Three Methods
| Method | Best For | Pattern |
|---|---|---|
| Straight-Line | Assets used evenly over time | Equal expense each year |
| Declining Balance | Assets that lose value quickly early on | Higher expense early, lower later |
| Units of Production | Assets tied to actual usage | Varies based on activity level |
Common Mistakes Students Make
- Forgetting to subtract salvage value before dividing by useful life in straight-line depreciation.
- Applying the declining balance percentage to the original cost instead of the remaining book value each year.
- Mixing up total units produced with units produced in a single year for the units of production method.
Why Choosing the Right Method Matters
Different depreciation methods affect reported profit differently, especially in early years. Businesses often choose a method based on how the asset is actually used and relevant tax or accounting standards.
Related reading: Financial Accounting Basics for Beginners, Adjusting Entries Examples for Students, Financial Statements Explained for Beginners
Frequently Asked Questions
What are the depreciation methods explained in FA courses?
The three most commonly taught methods are straight-line, declining balance, and units of production, each allocating asset costs differently over time.
Which depreciation method is easiest to calculate?
Straight-line depreciation is generally the simplest, since it spreads the cost evenly across the asset’s useful life every year.
Why does the declining balance method result in higher depreciation early on?
Because the fixed percentage is applied to the remaining book value, which is highest in the early years and shrinks over time.
Can a business switch depreciation methods?
Businesses can change methods, but doing so usually requires disclosure and justification, since it affects reported profit and asset values.
Does depreciation affect cash flow?
No, depreciation is a non-cash expense — it reduces reported profit on the income statement but doesn’t involve an actual outflow of cash.
Keep Learning
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