Calculate asset depreciation using multiple methods. Compare Straight-Line, Double Declining Balance, and Sum of Years Digits side-by-side.
Depreciation spreads an asset's cost over its useful life. Straight-line formula: (Cost - Salvage Value) / Useful Life. Example: A $50,000 machine with $5,000 salvage over 10 years depreciates $4,500 annually.
Try an example:
Equal annual depreciation over the asset life. Best for assets that wear evenly.
Enter asset cost, salvage value, and useful life to calculate depreciation.
When a business purchases equipment, vehicles, or other long-term assets, the cost isn't immediately expensed. Instead, depreciation spreads that cost over the asset's useful life, matching the expense with the revenue the asset helps generate. According to Investopedia, depreciation is a fundamental accounting concept that affects both financial statements and tax obligations.
The IRS Publication 946 provides comprehensive guidance on depreciation for tax purposes. For most businesses, understanding depreciation is essential because it directly impacts cash flow through tax deductions. A company claiming $100,000 in depreciation at a 25% tax rate saves $25,000 in taxes that year - real money that can be reinvested in the business.
Different depreciation methods serve different purposes. Straight-line depreciation is the simplest and most intuitive, spreading costs evenly over time. Accelerated methods like Double Declining Balance front-load depreciation expense, providing larger tax deductions in early years when the asset is newest. For tax reporting, most businesses must use MACRS (Modified Accelerated Cost Recovery System), which has specific rules and recovery periods for different asset classes.
Beyond tax benefits, accurate depreciation tracking helps businesses understand the true cost of operations, make informed capital expenditure decisions, and maintain realistic asset values on the balance sheet. Depreciation is a non-cash expense that analysts add back to EBITDA to measure operating cash generation, and it reduces net income on the income statement while simultaneously lowering the book value of assets on the balance sheet.
Annual Depreciation = (Asset Cost - Salvage Value) / Useful Life
Example: A $50,000 machine with $5,000 salvage value over 10 years = ($50,000 - $5,000) / 10 = $4,500 per year
Annual Depreciation = Book Value x (2 / Useful Life)
Example: Year 1 on $50,000 asset with 10-year life = $50,000 x (2/10) = $10,000. Year 2 = $40,000 x 20% = $8,000
Depreciation = (Remaining Life / Sum of Years) x Depreciable Base
Example: 5-year asset has sum = 1+2+3+4+5 = 15. Year 1 = (5/15) x $45,000 = $15,000. Year 2 = (4/15) x $45,000 = $12,000
Asset Cost minus Salvage Value. This is the total amount that will be depreciated over the asset's useful life. A $100,000 asset with $10,000 salvage value has a $90,000 depreciable base.
The asset's value on the balance sheet, calculated as Asset Cost minus Accumulated Depreciation. Book value decreases each year as depreciation accumulates, eventually reaching salvage value.
The total depreciation expense recorded since the asset was placed in service. This is a contra-asset account that reduces the asset's book value on the balance sheet.
For MACRS tax depreciation, the IRS assigns specific recovery periods: 5 years for vehicles and computers, 7 years for office furniture and equipment, 27.5 years for residential rental property, and 39 years for commercial buildings.
Each method allocates the same total depreciation, but the timing differs significantly. Choose based on how your asset actually loses value and your tax planning strategy.
A business purchases a high-end computer workstation for $3,000, expecting to use it for 5 years before replacement. Estimated salvage value is $300 (trade-in or resale).
For computers and technology equipment, accelerated depreciation often makes sense because these assets lose value quickly due to obsolescence. MACRS classifies computers as 5-year property.
A delivery company purchases a cargo van for $45,000. The vehicle will be used heavily for 5 years, then sold with an estimated trade-in value of $8,000.
Vehicles depreciate fastest in the first few years, making accelerated methods appropriate. The company might use straight-line for financial statements but MACRS 5-year for taxes.
A manufacturer invests $250,000 in a CNC milling machine. The machine is expected to operate for 10 years with heavy industrial use, with an estimated scrap value of $25,000.
Manufacturing equipment often qualifies for Section 179 expensing or bonus depreciation, potentially allowing the full $250,000 to be deducted in Year 1. MACRS classifies most manufacturing equipment as 7-year property.
While depreciation is essential for accounting and tax purposes, these calculations have inherent limitations that business owners should understand.
Useful life and salvage value are estimates made at purchase. Actual asset performance may vary significantly - equipment may last longer than expected or become obsolete faster. Periodic review and adjustment of depreciation estimates may be necessary under GAAP.
Depreciation reduces book value on a schedule, but market value fluctuates based on supply, demand, and economic conditions. An asset's book value may be significantly higher or lower than what it could actually be sold for.
Using different methods for tax (MACRS) and financial reporting (GAAP) creates deferred tax assets or liabilities. These temporary differences require careful tracking and can complicate financial analysis.
Depreciation is based on historical cost, ignoring inflation's effect on replacement costs. A machine bought for $100,000 may cost $150,000 to replace, but accumulated depreciation won't cover the full replacement.
Depreciation is a non-cash expense that reduces reported income but doesn't represent actual cash outflow (the cash was spent when the asset was purchased). Don't confuse depreciation expense with funds available for replacement.
For more guidance, visit the Accounting tools hub and the Valuefy blog.
Pair this tool with the Balance Sheet Generator and the Financial Analysis Tool to cross-check inputs. For strategic context, read our business acquisition process guide and explore the Accounting & Depreciation tools hub.
Depreciation allocates asset cost over useful life, providing tax deductions that reduce your tax liability and improve cash flow in the years the asset is used. Because it is a non-cash charge, acquirers always review EBITDA adjustments to add back depreciation when assessing true operating performance.
Choose depreciation methods based on how assets actually lose value: straight-line for consistent usage, accelerated methods for assets that depreciate quickly in early years.
MACRS is required for U.S. tax depreciation, with specific recovery periods: 5 years for vehicles and computers, 7 years for furniture and equipment, 39 years for commercial buildings.
Section 179 and bonus depreciation can provide immediate tax deductions for qualifying equipment, significantly accelerating tax benefits compared to standard depreciation schedules.
Total depreciation is the same regardless of method - only the timing differs. Accelerated methods defer taxes to later years, creating a time value of money benefit.