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Module 13: The Slow Decay - Depreciation & Amortization

When a company purchases a massive asset, like a Boeing 737 or a pharmaceutical patent, it does not record the entire cost as an immediate expense. Following the Matching Principle, the firm spreads that cost over the years the asset is actually utilized.

This process is divided into two categories:

  • Depreciation: For Tangible assets (e.g., factories, servers, vehicles).
  • Amortization: For Intangible assets (e.g., software licenses, patents).

1. Depreciation: Wear and Tear of the Physical

Physical assets lose value due to use, age, or technological obsolescence. US GAAP permits several methods to calculate this decay.

I. Straight-Line Method (The Standard) The most common reporting method. It assumes the asset provides the exact same economic benefit every year of its life.

  • Formula: (Asset Cost - Salvage Value) / Useful Life
  • Example: A firm buys a $100,000 delivery truck with a $10,000 salvage value and a 5-year life. They record $18,000 in depreciation expense every year.

II. Double-Declining Balance (Accelerated) Often used for assets that lose value rapidly (like computer servers). It front-loads the depreciation expense into the early years.

  • Note on Taxes: The IRS requires US companies to use an accelerated method called MACRS for their tax returns, allowing them to lower their tax bill today, even while using Straight-Line for their public SEC filings to keep reported net income high.

2. Amortization: The Expiry of the Invisible

Intangible assets do not physically "wear out," but their legal or economic utility expires. Amortization almost exclusively utilizes the Straight-Line method and generally assumes a salvage value of $0.

  • Example: A tech firm buys a patent for $10 Million that expires in 10 years. They amortize $1 Million a year.
  • Note: Goodwill (the premium paid to acquire another company) is not amortized under US GAAP. Instead, it is checked annually for "Impairment" to see if its value has permanently degraded.

3. The Tri-Statement Impact

Depreciation and Amortization are "non-cash" expenses, but they ripple through the ecosystem:

  1. Income Statement: They reduce Pre-Tax Income, lowering the firm's tax bill (creating a Tax Shield).
  2. Cash Flow Statement: Because no cash physically left the building, the expense is added back to Net Income in the Operating Cash Flow section.
  3. Balance Sheet: They reduce the Net Book Value of PP&E or Intangible Assets.

Case Study: The MACRS Tax Shield A US manufacturing firm purchases $50 Million in heavy machinery. For their public shareholder reports (GAAP), they use Straight-Line depreciation, spreading the expense over 20 years to keep reported Net Income high.

  • Analysis: However, for their IRS tax filings, they use MACRS (accelerated depreciation). This allows them to claim massive depreciation expenses in the first 5 years, drastically lowering their taxable income and preserving millions of dollars in actual cash today. This perfectly legal discrepancy creates what is known as a "Deferred Tax Liability" on the Balance Sheet.

Self-Assessment Quiz

  1. Why is Depreciation added back to Net Income on the Cash Flow Statement?
  2. Explain the difference between Depreciation and Amortization regarding the types of assets they cover.