Depreciation
Depreciation
Quick Definition
Depreciation is the accounting process of allocating the cost of a tangible long-term asset (machinery, buildings, vehicles, equipment) over its expected useful life. Rather than expensing the full cost in the year of purchase, depreciation spreads the expense across the periods in which the asset generates economic benefit.
What It Means
When a company buys a $500,000 piece of manufacturing equipment expected to last 10 years, it would distort financials to expense the full $500,000 in year one and then show $0 cost for the next nine years while the machine continues producing goods. Depreciation matches the cost to the periods of use.
Depreciation serves two parallel purposes:
- Financial reporting (GAAP): Accurately matching expenses to the periods they relate to
- Tax purposes: Reducing taxable income through deductions (tax depreciation often differs from book depreciation)
Depreciation is a non-cash expense — the company does not write a check for depreciation. The cash was spent when the asset was purchased; depreciation simply allocates that prior cash outflow as an expense over time. This is why depreciation is added back in operating cash flow and why EBITDA adds it back.
Methods of Depreciation
| Method | Description | Depreciation Pattern | Best For |
|---|---|---|---|
| Straight-Line | Equal amount each year | Uniform | Most assets; simplest |
| Double Declining Balance (DDB) | 2x straight-line rate on declining book value | Front-loaded | Assets losing value quickly early |
| Sum-of-Years-Digits (SYD) | Accelerated; uses fraction of remaining years | Front-loaded | Similar to DDB but smoother |
| Units of Production | Based on actual usage (hours, units) | Variable | Equipment where usage varies |
| MACRS (tax only) | IRS-mandated accelerated schedule | Front-loaded | U.S. federal tax returns |
Straight-Line Depreciation: The Most Common Method
Annual Depreciation = (Cost - Salvage Value) / Useful Life
Example: Company buys equipment for $100,000, estimated 5-year useful life, $10,000 salvage value:
Annual Depreciation = ($100,000 - $10,000) / 5 = $18,000/year
| Year | Book Value (Start) | Depreciation Expense | Accumulated Depreciation | Book Value (End) |
|---|---|---|---|---|
| 1 | $100,000 | $18,000 | $18,000 | $82,000 |
| 2 | $82,000 | $18,000 | $36,000 | $64,000 |
| 3 | $64,000 | $18,000 | $54,000 | $46,000 |
| 4 | $46,000 | $18,000 | $72,000 | $28,000 |
| 5 | $28,000 | $18,000 | $90,000 | $10,000 |
After 5 years, the asset is on the books at its $10,000 salvage value.
Double Declining Balance: Accelerated Depreciation
DDB Rate = (2 / Useful Life) × Book Value
For the same $100,000 asset with 5-year life:
| Year | Book Value (Start) | DDB Rate | Depreciation | Book Value (End) |
|---|---|---|---|---|
| 1 | $100,000 | 40% | $40,000 | $60,000 |
| 2 | $60,000 | 40% | $24,000 | $36,000 |
| 3 | $36,000 | 40% | $14,400 | $21,600 |
| 4 | $21,600 | 40% | $8,640 | $12,960 |
| 5 | $12,960 | Switch to SL | $2,960 | $10,000 |
DDB front-loads depreciation, reducing taxable income more in early years — beneficial for cash flow.
Tax Depreciation: Section 179 and Bonus Depreciation
For tax purposes, the IRS allows more aggressive depreciation schedules than GAAP:
| Tax Provision | Description | Limit (2024) |
|---|---|---|
| Section 179 | Immediate full expensing of qualifying business assets | $1,220,000 of purchases |
| Bonus Depreciation | Additional first-year deduction | 60% of qualifying property (phasing down) |
| MACRS | Mandatory accelerated schedule if not using 179/Bonus | Varies by asset class |
Example: A business buys a $200,000 truck. Under Section 179, it can deduct the full $200,000 in year one for tax purposes, even though GAAP depreciation might spread it over 5 years.
This creates a temporary timing difference: lower taxable income in early years, higher in later years — resulting in deferred tax liabilities on GAAP balance sheets.
How Depreciation Flows Through Financial Statements
| Statement | How Depreciation Appears |
|---|---|
| Income Statement | Depreciation expense reduces operating income (EBIT) |
| Balance Sheet | Accumulated depreciation reduces gross asset value to net book value |
| Cash Flow Statement | Added back to net income in operating activities (non-cash add-back) |
The asset section of the balance sheet:
| Asset | Gross Value | Accumulated Depreciation | Net Book Value |
|---|---|---|---|
| Buildings | $2,500,000 | ($800,000) | $1,700,000 |
| Equipment | $1,200,000 | ($600,000) | $600,000 |
| Vehicles | $180,000 | ($90,000) | $90,000 |
| Total PP&E | $3,880,000 | ($1,490,000) | $2,390,000 |
Depreciation's Effect on Reported Earnings vs. Cash Flow
This is why EBITDA matters: depreciation is a real expense in economic terms (assets do wear out) but not a cash outflow in the current period.
| Metric | Includes Depreciation? |
|---|---|
| Gross Profit | Sometimes (depreciation in COGS) |
| EBIT (Operating Income) | Yes |
| EBITDA | No (added back) |
| Net Income | Yes |
| Operating Cash Flow | No (added back to net income) |
| Free Cash Flow | Partially (CapEx proxy) |
Warren Buffett's critique: ignoring depreciation is dangerous for capital-intensive businesses because assets genuinely wear out and must be replaced. A business that earns $10M in EBITDA but needs $9M in annual CapEx to maintain its equipment is not a $10M business — it is a $1M business.
Key Points to Remember
- Depreciation spreads asset cost over its useful life — matching expense to the periods of economic benefit
- It is a non-cash expense — the cash was spent at purchase; depreciation is a later accounting entry
- Straight-line is most common for GAAP; MACRS/Section 179 are used for tax purposes
- Accumulated depreciation reduces the asset's carrying value on the balance sheet to "net book value"
- Depreciation is added back in the operating section of the cash flow statement
- EBITDA adds back depreciation — useful for comparing companies with different asset bases, but dangerous to use without considering real capital reinvestment needs
Common Mistakes to Avoid
- Confusing book value with market value: An asset's net book value (cost minus accumulated depreciation) has no direct relationship to its current market value or replacement cost.
- Treating EBITDA as equivalent to cash flow for CapEx-heavy businesses: For airlines, manufacturers, and utilities, depreciation is a real proxy for asset replacement costs. Ignoring it understates true costs.
Frequently Asked Questions
Q: What is the difference between depreciation and amortization? A: Both allocate costs over time, but depreciation applies to tangible assets (equipment, buildings), while amortization applies to intangible assets (patents, trademarks, goodwill). The mechanics are similar; the asset type differs.
Q: Can a company choose its depreciation method? A: For GAAP, companies have limited choices (straight-line, accelerated methods) but must apply them consistently and disclose their policy. For tax purposes, the IRS mandates specific methods (MACRS). Companies often use different methods for book vs. tax purposes.
Q: What happens when a depreciable asset is sold? A: The gain or loss equals the sale price minus the net book value. If an asset with $10,000 book value sells for $25,000, the company recognizes a $15,000 gain (taxable). If it sells for $6,000, it recognizes a $4,000 loss.
Related Terms
GAAP
GAAP is the standardized set of accounting rules, standards, and procedures that U.S. public companies must follow when preparing financial statements, ensuring consistency and comparability across all reported financials.
General Ledger
The general ledger is the master record of all a company's financial transactions, organized by account — the central repository from which all financial statements are derived and the foundation of the double-entry bookkeeping system.
Tangible Assets
Tangible assets are physical, measurable assets with a definitive monetary value — including property, equipment, inventory, and cash — forming the most concrete portion of a company's balance sheet.
Balance Sheet
A balance sheet is a financial statement that shows a company's assets, liabilities, and shareholders' equity at a specific point in time, following the fundamental accounting equation: Assets = Liabilities + Equity.
Amortization
Amortization is the gradual reduction of a debt through scheduled payments or the systematic expensing of an intangible asset's cost over its useful life, appearing in both loan repayment schedules and corporate accounting.
COGS
Cost of Goods Sold (COGS) is the direct cost of producing the goods or services a company sells, including materials and labor — the first deduction from revenue to calculate gross profit.
Related Articles
Capital Gains Tax Explained: What Happens When You Sell Investments
Every time you sell a stock, fund, property, or crypto at a profit, a tax bill can follow. Here is how capital gains tax works, what the rates are in 2026, and how to legally reduce what you owe.
Fractional Shares Explained: How to Invest in Amazon With $10
Fractional shares let you buy a slice of any stock or ETF regardless of its price. Here is how they work, which brokerages offer them, and when they actually matter for your portfolio.
When Should You Sell a Stock or Fund?
Knowing when to sell is the hardest skill in investing. Here are the specific conditions that justify selling - and the common emotional triggers that masquerade as rational reasons.
Splitting Finances With a Roommate: How to Do It Without Ruining the Friendship
Money disagreements are the most common reason roommate relationships fail. Here is how to set up a financial system before conflict starts - covering rent splits, shared expenses, and what to do when someone falls short.
Tax Loss Harvesting: A Simple Strategy Most Investors Ignore
When investments lose value, most people feel only the loss. Tax loss harvesting turns that loss into a tax benefit that can save you real money today and for years to come.
