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. For tax purposes, it reduces taxable income through tax deductions.
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. For financial reporting under GAAP, it accurately matches expenses to the periods they relate to. For tax purposes, it reduces taxable income through deductions. Tax depreciation often differs from book depreciation because the IRS allows accelerated schedules that front-load deductions.
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) x 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. This benefits cash flow because you get larger tax deductions sooner.
Tax Depreciation: Section 179 and Bonus Depreciation in 2026
The tax rules for depreciation saw major changes in 2025 and 2026. The One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, reinstated 100% bonus depreciation and made it permanent. This is the single most important business tax change for companies that buy equipment, vehicles, or machinery.
The IRS confirmed this in Publication 946 and Notice 2026-11, which states that the existing regulatory framework continues to apply.
| Tax Provision | Description | 2026 Limit |
|---|---|---|
| Section 179 | Immediate full expensing of qualifying business assets | $2,560,000 deduction cap |
| Bonus Depreciation | 100% first-year deduction of qualifying property | 100% (permanent, no phase-down) |
| MACRS | Mandatory accelerated schedule if not using 179/Bonus | Varies by asset class |
The Section 179 deduction cap jumped from $1,250,000 in 2025 to $2,560,000 in 2026, with the phaseout threshold starting at $4,090,000 of total qualifying property placed in service. The phaseout is dollar-for-dollar above that threshold, so a business that places $5,090,000 of qualifying property in service loses $1,000,000 of the Section 179 deduction and is capped at $1,560,000.
Bonus depreciation under Section 168(k) was scheduled to phase down to 20% in 2026 and 0% in 2027. The OBBBA reversed that. Property placed in service in 2026 and going forward gets 100% bonus depreciation if it qualifies, with no scheduled sunset. The prior phase-down schedule (80% in 2023, 60% in 2024, 40% in 2025) is gone.
Example: A business buys $2,000,000 of qualifying equipment in 2026. Under 100% bonus depreciation, it can deduct the entire $2,000,000 in year one. Under Section 179, it can elect to expense up to $2,560,000. Many businesses use both provisions together: Section 179 first for flexibility (it is elected asset by asset), then bonus depreciation on the remaining eligible basis.
One key difference: Section 179 cannot create a net operating loss and is limited to business taxable income. Bonus depreciation has no cap, no phaseout, and can create a loss. This matters in startup or expansion years when a business has modest taxable income but makes large equipment purchases.
How Depreciation Flows Through Financial Statements
Depreciation touches all three major financial statements in different ways.
| 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 looks like this:
| 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 because assets genuinely wear out and must be replaced. But it is 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 is worth remembering. 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. Depreciation approximates that replacement cost, and sweeping it under the rug with EBITDA can mislead investors.
Related Concepts
- Amortization: The equivalent of depreciation for intangible assets like patents and goodwill
- Balance Sheet: Where accumulated depreciation reduces asset carrying values
- Income Statement: Where depreciation expense flows through as an operating cost
- EBITDA: A profitability metric that adds back depreciation and amortization
- Tangible Assets: The physical assets subject to depreciation
- GAAP: The accounting standards governing how depreciation is reported
- Tax Deduction: How depreciation reduces taxable income
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. A building purchased 20 years ago for $500,000 might have a book value of $200,000 but a market value of $2,000,000.
- Treating EBITDA as equivalent to cash flow for capital-intensive businesses: For airlines, manufacturers, and utilities, depreciation is a real proxy for asset replacement costs. Ignoring it understates true costs and overstates the company's cash-generating ability.
- Forgetting that bonus and Section 179 create timing differences, not permanent tax savings: Accelerated depreciation lowers taxes now but raises them later because the asset has already been fully expensed. The total tax deduction over the asset's life is the same regardless of method. The benefit is the time value of having the cash sooner.
- Missing the Section 179 income limitation: Section 179 is limited to taxable income from the active conduct of a trade or business. If your business has a loss, you cannot use Section 179 to increase it. Disallowed amounts carry forward to future years.
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, vehicles) 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) unless you elect Section 179 or bonus depreciation. Companies often use different methods for book versus tax purposes, which creates deferred tax liabilities on the balance sheet.
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. If you used Section 179 or bonus depreciation to fully expense the asset, the entire sale price is a taxable gain because the book value is zero.
Q: Is 100% bonus depreciation permanent? A: Under the OBBBA signed in July 2025, 100% bonus depreciation is permanent for qualified property acquired after January 19, 2025. There is no phasedown schedule. However, tax laws can change with new legislation, so consult a tax professional for the most current rules.
Related Terms
GAAP
GAAP is the rulebook U.S. companies must follow when reporting financials. Learn how FASB standards shape earnings, audits, and investor decisions in 2026.
General Ledger
The general ledger is the master record of every financial transaction a company makes. Learn how double-entry bookkeeping, the chart of accounts, and modern software keep the books balanced.
Tangible Assets
Tangible assets are physical, measurable assets with a definitive monetary value, including property, equipment, inventory, and cash. They form 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 and corporate accounting.
COGS
Cost of Goods Sold is the direct cost of producing the goods or services a company sells, including materials and labor. It is the first deduction from revenue to calculate gross profit.
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