Depreciation and Amortization
Depreciation and amortization are accounting methods used to allocate the cost of long-term assets over the periods that benefit from those assets. They do not represent a new cash payment each period. Instead, they recognize that assets are consumed, used up, or lose economic usefulness over time.
Depreciation applies to tangible long-term assets such as machinery, vehicles, furniture, and buildings. Amortization applies to intangible assets with finite useful lives, such as patents, copyrights, software licenses, and acquired customer lists.
Learning Objectives
- Define depreciation and amortization and explain why they are necessary under the matching principle
- Apply straight-line, units-of-production, and declining balance methods to calculate periodic depreciation
- Compare depreciation under US GAAP with MACRS depreciation used for US income tax purposes
- Explain how accumulated depreciation affects the carrying amount of an asset on the balance sheet
- Analyze how depreciation affects the income statement, balance sheet, and statement of cash flows differently
- Distinguish between finite-life intangibles (amortized) and indefinite-life intangibles (tested for impairment)
- Identify common errors in applying depreciation and amortization in exam and real-world scenarios
Quick Answer
Depreciation and amortization (D&A) spread the cost of long-term assets across the periods that benefit from them, following the matching principle. If a company buys a $500,000 machine and uses it for five years, booking the entire cost in year one would destroy that year's profit and overstate future years. Instead, a portion of the cost is expensed each year. D&A reduces reported profit but involves no current-period cash outflow — the cash left when the asset was purchased. This non-cash nature makes D&A significant in the statement of cash flows, where it is added back to net income under the indirect method. In the US, book depreciation (GAAP) and tax depreciation (IRS MACRS) usually differ, creating deferred tax assets and liabilities.
Why Depreciation and Amortization Are Needed
If a company buys a machine for $500,000 and uses it for five years, recording the full cost as an expense in year one would:
- Understate profit in year one (by expensing five years of benefit at once)
- Overstate profit in years two through five (by showing no expense for a still-productive asset)
Depreciation spreads the cost across the years that receive benefit. This follows the expense recognition (matching) principle: expenses should be recognized in the same periods as the revenues they help generate.
Depreciation vs Amortization
| Basis | Depreciation | Amortization |
|---|---|---|
| Asset type | Tangible long-term assets | Intangible assets with finite useful life |
| Examples | Machine, vehicle, equipment, building | Patent, copyright, software license, customer list |
| Common methods | Straight-line, declining balance, units-of-production | Almost always straight-line |
| Residual value | Usually considered | Often assumed to be zero |
| Balance sheet treatment | Accumulated depreciation (contra-asset) | Accumulated amortization or direct reduction |
| Indefinite-life assets | Land is never depreciated | Goodwill and indefinite-life intangibles are tested for impairment, not amortized |
Key Terms
| Term | Definition | Related Concept |
|---|---|---|
| Cost | Amount paid to acquire and prepare the asset for its intended use | Capitalization |
| Useful life | Expected period over which the asset will provide economic benefit | Residual value |
| Residual value | Estimated salvage or scrap value at the end of useful life | Depreciable amount |
| Depreciable amount | Cost minus residual value; the total amount to be depreciated | Straight-line method |
| Accumulated depreciation | Running total of all depreciation recorded for an asset to date | Contra-asset |
| Carrying amount (book value) | Cost minus accumulated depreciation; the asset's reported balance sheet value | Fair value |
| Impairment | Write-down when an asset's carrying amount exceeds its recoverable amount | Goodwill |
| MACRS | Modified Accelerated Cost Recovery System; IRS method for tax depreciation in the US | Deferred tax liability |
| Contra-asset | An account that reduces the related asset's balance; accumulated depreciation is a contra-asset | Balance sheet |
| Amortization | Systematic allocation of an intangible asset's cost over its finite useful life | Depreciation |
Straight-Line Depreciation
Straight-line depreciation records equal expense each period. It is the most common method under US GAAP.
Annual depreciation = (Cost − Residual value) / Useful life
Example (US context):
A company buys delivery equipment for $500,000. Estimated residual value is $50,000. Useful life is 5 years.
Annual depreciation = ($500,000 − $50,000) / 5 = $90,000 per year
| Year | Depreciation Expense | Accumulated Depreciation | Carrying Amount |
|---|---|---|---|
| 1 | $90,000 | $90,000 | $410,000 |
| 2 | $90,000 | $180,000 | $320,000 |
| 3 | $90,000 | $270,000 | $230,000 |
| 4 | $90,000 | $360,000 | $140,000 |
| 5 | $90,000 | $450,000 | $50,000 |
At the end of year 5, the carrying amount equals the residual value. No further depreciation is recorded.
Straight-line is appropriate when the asset provides roughly equal benefit in each period.
Units-of-Production Method
This method links depreciation to actual usage rather than time.
Depreciation per unit = (Cost − Residual value) / Expected total units
Depreciation expense = Depreciation per unit × Units produced in the period
This method is useful for machines, vehicles, or equipment whose wear is driven by use rather than the passage of time.
Example: A press machine costs $200,000 with $20,000 residual value and expected life of 90,000 units. In year 1, it produces 22,000 units.
Depreciation per unit = ($200,000 − $20,000) / 90,000 = $2.00
Year 1 depreciation = $2.00 × 22,000 = $44,000
Declining Balance Method
Declining balance records higher depreciation in earlier years and lower amounts in later years. It is an accelerated method.
The double-declining balance (DDB) rate is calculated as:
DDB rate = (1 / Useful life) × 2
Depreciation expense = DDB rate × Carrying amount at start of year
Example: Equipment costs $100,000, useful life 5 years, no residual value.
DDB rate = (1/5) × 2 = 40%
| Year | Carrying Amount (Start) | Depreciation (40%) | Carrying Amount (End) |
|---|---|---|---|
| 1 | $100,000 | $40,000 | $60,000 |
| 2 | $60,000 | $24,000 | $36,000 |
| 3 | $36,000 | $14,400 | $21,600 |
| 4 | $21,600 | $8,640 | $12,960 |
| 5 | $12,960 | $12,960* | $0 |
*In the final year, depreciation is adjusted to bring carrying amount to residual value (zero here).
Accelerated methods front-load expense, reducing taxable income in early years — which is why the IRS's MACRS system uses accelerated schedules for tax purposes.
US GAAP vs IRS MACRS (Tax Depreciation)
In the US, book depreciation (GAAP) and tax depreciation (MACRS) almost always differ. This creates temporary differences that appear as deferred tax liabilities on the balance sheet.
| Feature | US GAAP (Book) | IRS MACRS (Tax) |
|---|---|---|
| Method | Straight-line (most common) | Accelerated (front-loaded) |
| Useful life | Estimated by management | Prescribed by IRS by asset class |
| Residual value | Considered | Ignored (assets depreciated to zero) |
| Bonus depreciation | Not applicable | Up to 100% first-year expensing (Section 168(k)) |
| Purpose | Match expense to economic benefit | Incentivize capital investment |
Bonus depreciation under Section 168(k) allowed 100% first-year expensing for qualified assets placed in service before 2023; it has been phasing down annually (80% in 2023, 60% in 2024, 40% in 2025, etc.).
Journal Entry for Depreciation
Typical depreciation entry (year-end or monthly):
| Account | Debit | Credit |
|---|---|---|
| Depreciation expense | $90,000 | |
| Accumulated depreciation | $90,000 |
Accumulated depreciation is a contra-asset account. It is subtracted from the asset's cost on the balance sheet to show the carrying amount.
Balance sheet presentation:
Equipment (cost) $500,000
Less: Accumulated depreciation ($270,000)
Equipment, net $230,000
Amortization Example
A company purchases a patent for $240,000 with a legal life of 20 years but expects to use it for only 8 years (the shorter of legal life and useful economic life is used).
Annual amortization = $240,000 / 8 = $30,000 per year
Journal entry:
| Account | Debit | Credit |
|---|---|---|
| Amortization expense | $30,000 | |
| Accumulated amortization (or Patent) | $30,000 |
Under US GAAP, intangible assets with indefinite useful lives (such as goodwill and some trade names) are not amortized. Instead, they are tested for impairment annually under ASC 350. If the carrying value exceeds the fair value, an impairment loss is recognized immediately.
Effect on Financial Statements
| Statement | Effect of Depreciation / Amortization |
|---|---|
| Income statement | Expense reduces operating income and net income each period |
| Balance sheet | Accumulated depreciation reduces the asset's carrying amount; equity decreases via lower net income |
| Statement of cash flows (indirect) | Non-cash expense added back to net income in operating activities |
Because depreciation is non-cash, a company can report lower profit without any current-period cash outflow. This is why EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization) is used as a rough proxy for cash operating profitability.
Example of indirect method operating section:
Net income $59,250
Add: Depreciation expense $90,000
Add: Amortization expense $30,000
(Increase) in accounts receivable ($15,000)
Net cash from operating activities $164,250
Common Mistakes
Misconception: Depreciation is a cash expense — the company pays $90,000 in cash each year for depreciation. Why it's wrong: Cash left when the asset was purchased. Depreciation is simply the accounting allocation of that past cash outflow over the years the asset is used. No new cash payment is made each period for depreciation. Correct understanding: Depreciation reduces net income but not cash. That is why it is added back in the indirect method cash flow statement — it was subtracted in computing net income but does not represent a cash outflow in the current period.
Misconception: Depreciation tracks the market value decline of an asset. Why it's wrong: Depreciation allocates cost according to a schedule based on useful life — it does not attempt to track actual market price changes. A car might lose 30% of its market value in year one, but straight-line depreciation would only record 20% of depreciable cost (for a 5-year life). Conversely, land may appreciate, but it is never depreciated. Correct understanding: Carrying amount is a book concept — cost allocation, not valuation. The market value of an asset may be completely different from its carrying amount on the balance sheet.
Misconception: All intangible assets must be amortized over their useful lives. Why it's wrong: US GAAP (ASC 350) distinguishes between finite-life and indefinite-life intangibles. Finite-life intangibles (patents, copyrights, acquired software) are amortized. Indefinite-life intangibles (goodwill, certain trade names) are not amortized; they are tested for impairment annually. Amortizing goodwill every year is a common student error. Correct understanding: The first question is always: does this intangible have a finite useful life? If yes, amortize over that life. If no (indefinite life), test for impairment instead of amortizing.
Comparison and Connections
| Feature | Straight-Line | Declining Balance (DDB) | Units-of-Production |
|---|---|---|---|
| Expense pattern | Equal each period | Higher early, lower later | Varies with output |
| Best suited for | Consistent-use assets | Technology, vehicles | Machinery, mines |
| Complexity | Low | Medium | Medium |
| Effect on early-year profit | Neutral | Reduces more | Depends on usage |
| US tax (MACRS) equivalent | No | Yes (accelerated) | Available for some assets |
| Requires usage data? | No | No | Yes |
Practice Questions
Recall
Q1. What is the formula for straight-line depreciation, and what does "depreciable amount" mean?
Answer guidance: Annual depreciation = (Cost − Residual value) / Useful life. Depreciable amount is the cost minus the estimated residual (salvage) value — the total cost that will be expensed over the asset's life. Residual value is excluded because that portion will be recovered when the asset is sold.
Q2. What is accumulated depreciation, and where does it appear on the balance sheet?
Answer guidance: Accumulated depreciation is the running total of all depreciation recognized on an asset since acquisition. It appears as a contra-asset, subtracted from the asset's original cost to produce the carrying amount (book value). It keeps increasing each period until the asset is fully depreciated or disposed of.
Understanding
Q3. Explain in your own words why depreciation is added back to net income in the indirect method cash flow statement.
Answer guidance: Depreciation reduces net income on the income statement, but it involves no current cash payment — the cash was spent when the asset was purchased. The indirect method starts with net income and adjusts for non-cash items to arrive at actual cash from operations. Since depreciation was subtracted from income but did not use cash, it must be added back to get the true cash picture.
Q4. Explain the difference between book depreciation under US GAAP and tax depreciation under IRS MACRS. Why do they differ?
Answer guidance: GAAP depreciation uses management's best estimate of useful life and often straight-line allocation — it aims to match expense to economic benefit. MACRS uses IRS-prescribed asset classes and accelerated rates (regardless of actual economic life) to incentivize capital investment by providing larger upfront tax deductions. This timing difference creates a deferred tax liability when tax depreciation exceeds book depreciation in early years.
Application
Q5. A company buys a $180,000 piece of manufacturing equipment on January 1, with a $30,000 residual value and a 5-year useful life. Calculate the straight-line depreciation for year 3, and state the carrying amount at the end of year 3.
Answer guidance: Depreciable amount = $180,000 − $30,000 = $150,000. Annual depreciation = $150,000 / 5 = $30,000. After 3 years, accumulated depreciation = $90,000. Carrying amount end of year 3 = $180,000 − $90,000 = $90,000.
Q6. A company uses the double-declining balance method for a $100,000 truck with a 4-year life and zero residual value. What is the depreciation expense in years 1 and 2?
Answer guidance: DDB rate = (1/4) × 2 = 50%. Year 1: 50% × $100,000 = $50,000. Year 2: 50% × $50,000 (carrying amount at start of year 2) = $25,000. Total after two years = $75,000 in accumulated depreciation.
Analysis
Q7. A company switches from declining balance to straight-line depreciation for a large fleet of vehicles midway through the assets' lives. What accounting principle is implicated, and what must the company disclose?
Answer guidance: The consistency principle is implicated — the company has changed its accounting method. Under US GAAP, a change in depreciation method is treated as a change in accounting estimate (not a prior-period error) applied prospectively. The company must disclose the change, its justification, and the dollar effect on the current period's depreciation expense in the notes. It does not restate prior years for a change in estimate.
Q8. Analyze how a company's choice between straight-line and accelerated depreciation affects its reported earnings, balance sheet asset values, and attractiveness to lenders in the early years of an asset's life.
Answer guidance: In early years, accelerated depreciation produces higher expense, lower net income, lower retained earnings, and lower asset carrying amounts than straight-line. Lenders examining a balance sheet will see lower book equity and lower asset values under accelerated methods — potentially affecting debt covenants tied to net worth or asset coverage ratios. However, accelerated depreciation reduces taxable income more in early years, improving near-term cash flow from tax savings. Companies face a trade-off: better-looking early income (straight-line) versus better near-term tax cash flows (accelerated / MACRS).
FAQ
If depreciation does not involve cash, why does it matter for decision-making?
Depreciation matters for three reasons. First, it affects reported profit — analysts, investors, and bonus targets are often based on earnings, which depreciation reduces. Second, it affects income tax if book and tax depreciation were the same (they usually are not, due to MACRS). Third, it signals asset age: heavy accumulated depreciation relative to original cost means assets are old and may need replacement soon, which does involve future cash outflows. Depreciation is also a major variable in operating leverage analysis and break-even calculations.
What happens when an asset is sold before it is fully depreciated?
When an asset is sold, the original cost and all accumulated depreciation are removed from the books. If the sale proceeds exceed the carrying amount, a gain is recorded. If proceeds are less than carrying amount, a loss is recorded. Both gains and losses appear on the income statement. For example: an asset with a $100,000 cost and $70,000 accumulated depreciation has a $30,000 carrying amount. If it sells for $35,000, the company records a $5,000 gain.
What is goodwill, and why is it not amortized under US GAAP?
Goodwill arises when a company acquires another business for more than the fair value of its identifiable net assets. It represents unidentifiable value like brand reputation, customer relationships, and synergies. Under FASB ASC 350, goodwill is not amortized because it is considered to have an indefinite life — it does not "use up" in a predictable way. Instead, it must be tested for impairment at least annually. If the reporting unit's fair value falls below its carrying amount, goodwill is written down. This was a major change from pre-2001 rules, which required goodwill amortization over up to 40 years.
How does MACRS bonus depreciation affect a US company's tax return versus its GAAP financial statements?
Under Section 168(k), qualifying assets can be 100% expensed in the year of purchase for tax purposes (phasing down from 2023 onward). For GAAP purposes, the same asset would be depreciated over several years using straight-line. In the purchase year, the company reports a large tax deduction (reducing tax owed) but a much smaller GAAP depreciation expense. This timing gap creates a deferred tax liability on the GAAP balance sheet — the company has essentially borrowed a tax break from future periods and will owe more tax in those years once MACRS runs out but GAAP depreciation continues.
Can a company choose different depreciation methods for different assets?
Yes — a company can use straight-line for buildings, declining balance for vehicles, and units-of-production for manufacturing equipment, applying the method that best reflects each asset's consumption pattern. The only requirement is consistency: once chosen, the method must be applied consistently to each asset class, and any changes must be disclosed. US GAAP allows this flexibility because different assets are genuinely used up differently. However, companies cannot switch methods to manipulate a single year's earnings without disclosure and justification.
Quick Revision
- Depreciation allocates tangible asset cost over useful life; amortization does the same for finite-life intangibles
- Both follow the matching principle: expense in the period the asset helps generate revenue
- Straight-line formula: (Cost − Residual value) / Useful life = equal annual expense
- Units-of-production: depreciation per unit × units used this period; varies with activity
- Double-declining balance: applies 2 × straight-line rate to carrying amount; front-loads expense
- Accumulated depreciation is a contra-asset; carrying amount = cost − accumulated depreciation
- Land is never depreciated; goodwill and indefinite-life intangibles are tested for impairment, not amortized
- Depreciation reduces net income but involves no current cash outflow — added back in indirect cash flow
- US GAAP book depreciation (straight-line) vs IRS MACRS (accelerated) creates deferred tax liabilities
- Section 168(k) bonus depreciation allows accelerated first-year tax expensing for US businesses
- When an asset is disposed of, cost and accumulated depreciation are removed; gain or loss is recognized
- EBITDA adds back depreciation and amortization to approximate operating cash generation
Related Topics
Prerequisites
- Basic accounting principles (matching principle, expense recognition)
- Financial statements: income statement and balance sheet structure
- Journal entries and the accounting cycle
Related Topics
- Long-term assets: acquisition, capitalization, and disposal
- Deferred tax assets and liabilities
- Impairment testing for goodwill and intangibles (ASC 350)
Next Topics
- Inventory costing methods (FIFO, LIFO, weighted average) and their income statement effects
- Financial statement analysis and ratio interpretation
- Capital budgeting and net present value (NPV) of long-term investments