The Slow Decay - Depreciation & Amortization
When a company buys a massive asset-like a delivery truck or a software patent-it doesn't record the entire cost as an expense on day one. Instead, it follows the Matching Principle by spreading that cost over the years the asset is actually used.
This process of "spreading the cost" is split into two categories based on the asset type:
- Depreciation: For Tangible assets (things you can touch, like machinery or furniture).
- Amortization: For Intangible assets (things you cannot touch, like copyrights or software licenses).
1. Depreciation: Wear and Tear of the Physical
Physical assets lose value due to use, age, or obsolescence. There are three common ways to calculate this:
I. Straight-Line Method (The Constant Path)
The most common method where an equal amount of depreciation is recorded each year. It assumes the asset provides the same benefit throughout its life.
Formula:
Annual Depreciation =
Calculation Example:
A logistics company buys a delivery van for ā¹20,00,000. They expect to use it for 5 years, after which they can sell it for ā¹2,00,000 (Salvage Value).
- Depreciable Base: 20,00,000 - 2,00,000 = ā¹18,00,000
- Annual Expense: 18,00,000 / 5 = ā¹3,60,00,000
- Result: The company records ā¹3.6 Lakhs in depreciation every year for five years.
II. Double-Declining Balance (The Accelerated Path)
This method is used for assets that lose value rapidly in the first few years (like laptops or cars). It is an Accelerated method, meaning higher expenses in early years and lower expenses later.
Formula:
Depreciation Expense = 2 x Straight-Line Rate x Beginning Book Value
Calculation Example:
Using the same van (ā¹20,00,000 cost, 5-year life):
- Straight-Line Rate: 1 / 5 = 20%
- DDB Rate: 20% x 2 = 40%
- Year 1 Expense: 20,00,000 x 40% = ā¹8,00,000
- Year 2 Expense: 20,00,000 - 8,00,000) x 40% = ā¹4,80,000
- Result: Year 1 is ā¹8 Lakhs, significantly higher than the Straight-Line method.
III. Units of Production (The Usage Path)
Depreciation is linked to how much the asset is actually used rather than how long it has been owned. This is ideal for factory machinery.
Formula:
Rate per Unit =
Annual Expense = Rate per Unit x Actual Units Produced
Calculation Example:
A printing press costs ā¹50,00,000 with a ā¹5,00,000 salvage value. It is expected to print 10,00,000 pages in its lifetime. In Year 1, it prints 1,50,000 pages.
- Rate per Unit: $(50L - 5L) / 10L = ā¹4.5 per page
- Year 1 Expense: $1,50,000 x 4.5 =ā¹6,75,000
2. Amortization: The Expiry of the Invisible
Intangible assets-like Patents or Trademarks-don't "wear out," but they have a limited legal or economic life. Amortization almost always uses the Straight-Line method and usually assumes a salvage value of ā¹0.
Calculation Example:
A pharmaceutical company spends ā¹1,00,00,000 to acquire a drug patent that will expire in 10 years.
- Annual Amortization: $1,00,00,000 / 10 = ā¹10,00,000 per year
Note: "Goodwill" (the premium paid when buying another company) is not amortized. Instead, it is checked for "Impairment" once a year to see if its value has dropped.
3. Impact on the Three Statements
Even though these are "non-cash" expenses, they ripple through everything:
- Income Statement: Reduces Pre-Tax Income, which lowers the company's tax bill (a "Tax Shield").
- Cash Flow Statement: Since no actual cash left the building, depreciation/amortization is added back to Net Income in the Operating section.
- Balance Sheet: Reduces the Net Book Value of assets.
Summary
- Straight-Line: Best for predictable assets (buildings).
- Accelerated (DDB): Best for tech that becomes obsolete fast (computers).
- Units of Production: Best for industrial usage (machinery).
- Amortization: Applies to non-physical assets over their legal life.