Different Types of Depreciation
How Businesses Spread the Cost of Assets Over Time
When a business buys something expensive — like machinery, vehicles, computers, or buildings — the cost usually cannot be recorded as a single expense immediately.
Instead, accounting rules require the cost to be spread over the useful life of the asset.
This process is called depreciation.
Depreciation reflects a simple reality: assets lose value over time due to use, wear, or technological obsolescence.
But there is more than one way to calculate it.
Different depreciation methods can change how profits appear in financial statements.
1. Straight-Line Depreciation
This is the simplest and most common method.
The asset loses the same value every year.
Example
A company buys a machine for €10,000.
Useful life: 5 years.
Residual value: €0.
Annual depreciation:
€10,000 ÷ 5 = €2,000 per year
| Year | Depreciation | Remaining Value |
|---|
| 1 | €2,000 | €8,000 |
| 2 | €2,000 | €6,000 |
| 3 | €2,000 | €4,000 |
| 4 | €2,000 | €2,000 |
| 5 | €2,000 | €0 |
Why companies use it
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Simple
-
Predictable
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Easy for reporting
2. Declining Balance Depreciation
This method depreciates more value in the early years.
Instead of dividing evenly, a fixed percentage is applied to the remaining value each year.
Example
Asset cost: €10,000
Depreciation rate: 20%
| Year | Depreciation | Remaining Value |
|---|
| 1 | €2,000 | €8,000 |
| 2 | €1,600 | €6,400 |
| 3 | €1,280 | €5,120 |
| 4 | €1,024 | €4,096 |
The depreciation decreases over time.
Why this method exists
Many assets lose value faster in the first years.
Think about:
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computers
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vehicles
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electronics
3. Double Declining Balance
This is an accelerated depreciation method.
The company applies double the straight-line rate to the remaining value.
Example
Asset life: 5 years
Straight-line rate = 20%
Double declining rate = 40%
| Year | Depreciation | Remaining Value |
|---|
| 1 | €4,000 | €6,000 |
| 2 | €2,400 | €3,600 |
| 3 | €1,440 | €2,160 |
Large depreciation occurs early.
Why companies use it
4. Units of Production Depreciation
This method depends on how much the asset is used, not time.
Depreciation is calculated based on production output or hours of use.
Example
Machine cost: €50,000
Expected production: 100,000 units
Depreciation per unit:
€50,000 ÷ 100,000 = €0.50 per unit
If the machine produces 10,000 units in a year:
Depreciation = €5,000
Useful for
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manufacturing equipment
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industrial machinery
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mining equipment
5. Sum-of-the-Years'-Digits Method
Another accelerated method.
Early years receive higher depreciation.
Example
Asset life: 5 years
Sum of digits:
5 + 4 + 3 + 2 + 1 = 15
First year depreciation:
5 / 15 × asset cost
Second year:
4 / 15 × asset cost
And so on.
This gradually reduces depreciation each year.
6. Component Depreciation
Sometimes assets are made of different parts with different lifespans.
Each component is depreciated separately.
Example: an airplane.
Each part has its own depreciation schedule.
Why Depreciation Matters
Depreciation affects:
Two companies with identical assets may report different profits simply because they use different depreciation methods.
Depreciation is not just an accounting rule.
It is a financial interpretation of time.
Every machine, vehicle, or building slowly transfers its value from the balance sheet… into the income statement.
Understanding how that transfer happens helps you read financial statements more intelligently.
