Depreciation Calculator
Calculate annual and monthly depreciation on any asset using straight-line or double declining balance, with book value shown at the end of each year.
$
$
years
Enter your values above to see the results.
Tips & Notes
- ✓Double declining balance produces larger depreciation deductions in early years, deferring taxable income — valuable for businesses with high current-year income.
- ✓Section 179 expensing allows immediate full deduction of qualifying business assets up to $1,160,000 (2023) — eliminating the need for multi-year depreciation schedules on most equipment.
- ✓Bonus depreciation (100% through 2022, phasing down) allows additional first-year deductions beyond Section 179 on qualifying property — consult a tax professional for current rates.
- ✓Book depreciation (for financial reporting) and tax depreciation can differ — a company may use straight-line for GAAP reporting and MACRS for tax purposes simultaneously.
- ✓Salvage value estimates affect total depreciable amount — conservative salvage values produce lower annual depreciation; aggressive salvage values produce higher annual depreciation.
- ✓When selling a depreciated asset, the difference between the sale price and the book value creates a taxable gain or loss — track book value carefully for any asset that may be sold.
Common Mistakes
- ✗Depreciating land — land is not a depreciable asset because it does not wear out; only the buildings and improvements on land are depreciated.
- ✗Using the wrong useful life — IRS MACRS tables specify the required depreciation period for tax purposes by asset class; using a different life creates tax compliance risk.
- ✗Not switching from double declining balance to straight-line when straight-line produces a larger deduction — DDB switches to SL when SL exceeds DDB, which maximizes total depreciation.
- ✗Forgetting salvage value in the straight-line calculation — straight-line depreciation applies to cost minus salvage value, not the full cost.
- ✗Confusing book depreciation with cash flow — depreciation is a non-cash expense that reduces taxable income and net income but does not represent a cash outflow.
- ✗Not recalculating depreciation after a significant capital improvement — improvements to existing assets may extend useful life and require a revised depreciation schedule.
Depreciation Calculator Overview
A depreciation calculator determines how much of an asset value is expensed each period based on its cost, salvage value, useful life, and the chosen depreciation method. Depreciation is a non-cash accounting expense that reduces taxable income while reflecting the gradual consumption of an asset value over time.
The two most common methods — straight-line and double declining balance — produce very different depreciation schedules and have different impacts on reported profit and taxes in each year.
What each field means:
- Asset Cost — the original purchase price of the asset; the starting value before any depreciation
- Salvage Value — the estimated residual value at the end of useful life; depreciation is calculated on cost minus salvage value
- Useful Life — the expected number of years the asset will be used; IRS tables specify useful life for tax depreciation
- Method — straight-line (equal depreciation each year) or double declining balance (accelerated depreciation, higher in early years)
What your results mean:
- Annual Depreciation — the depreciation expense recognized each year
- Monthly Depreciation — annual depreciation divided by 12; for monthly financial statements
- Book Value (End Year 1) — the asset value on the balance sheet after the first year of depreciation
- Total Depreciable Amount — asset cost minus salvage value; the total amount that will be depreciated over the asset life
- Annual Depreciation Rate — the percentage of the depreciable base expensed each year
Example — $50,000 machine, $5,000 salvage value, 8-year life:
Total depreciable amount: $50,000 - $5,000 = $45,000 Straight-line method: Annual depreciation: $45,000 / 8 = $5,625/year Monthly depreciation: $469 Book value end year 1: $50,000 - $5,625 = $44,375 Book value end year 8: $5,000 (salvage value) Double declining balance (25% rate = 2/8): Year 1: $50,000 x 25% = $12,500 Year 2: $37,500 x 25% = $9,375 Year 3: $28,125 x 25% = $7,031 Year 4: $21,094 x 25% = $5,273 (then switch to straight-line)
EX: How method choice affects early-year depreciation — $50,000 asset, $5k salvage, 8yr life Year 1 straight-line: $5,625 depreciation, $44,375 book value Year 1 double declining: $12,500 depreciation, $37,500 book value Year 1 DDB saves $6,875 in taxable income — real tax deferral at 25% rate: $1,719 Total depreciation over 8 years: identical ($45,000) under both methods DDB front-loads deductions; straight-line spreads them evenly — the choice is timing, not total.
Depreciation schedule — $50,000 cost, $5,000 salvage, 8-year life:
| Year | Straight-Line | DDB Depreciation | DDB Book Value |
|---|---|---|---|
| 1 | $5,625 | $12,500 | $37,500 |
| 2 | $5,625 | $9,375 | $28,125 |
| 3 | $5,625 | $7,031 | $21,094 |
| 4 | $5,625 | $5,625 (switch to SL) | $15,469 |
IRS useful life guidelines for common asset categories:
| Asset Type | IRS Useful Life | Depreciation Method |
|---|---|---|
| Computers and software | 5 years | MACRS 200% DB |
| Vehicles and equipment | 5-7 years | MACRS 200% DB |
| Commercial real estate | 39 years | Straight-line |
| Residential rental property | 27.5 years | Straight-line |
Accelerated depreciation methods like double declining balance and MACRS (Modified Accelerated Cost Recovery System) are favored for tax purposes because they defer taxable income to later years — effectively an interest-free loan from the government. Section 179 expensing and bonus depreciation allow businesses to deduct the full cost of qualifying assets in the year of purchase rather than depreciating over useful life — maximizing the immediate tax benefit of capital investment.
Frequently Asked Questions
Depreciation is the systematic allocation of an asset cost over its useful life as an accounting expense. It reflects the economic reality that assets wear out, become obsolete, and lose value over time. Depreciation reduces taxable income without requiring a cash outflow — it is a non-cash expense. For tax purposes, depreciation creates real tax savings by reducing income taxes in the years the deduction is taken. For financial reporting, depreciation matches the cost of using an asset with the revenue it helps generate in each period, producing a more accurate picture of profitability.
Straight-line depreciation allocates equal expense in each year of useful life: Annual depreciation = (Cost - Salvage Value) / Useful Life. Double declining balance accelerates depreciation by applying twice the straight-line rate to the declining book value each year: Annual depreciation = Book Value x (2 / Useful Life). DDB produces higher deductions in early years and lower in later years. Both methods depreciate the same total amount over the full useful life. DDB is preferred for tax purposes when the goal is to defer taxable income. Straight-line is simpler and produces more stable reported earnings for financial reporting.
MACRS (Modified Accelerated Cost Recovery System) is the required depreciation method for US federal tax purposes for most business assets. It uses predetermined useful life categories and accelerated depreciation rates. MACRS ignores salvage value — the full cost is depreciated. Property is assigned to specific recovery classes (3-year, 5-year, 7-year, 15-year, 27.5-year, 39-year) based on asset type. The 5-year class includes computers and automobiles; the 7-year class includes most machinery and equipment; 27.5-year applies to residential rental property; 39-year to commercial real estate. MACRS also applies a half-year convention, treating all property as placed in service at mid-year.
Section 179 of the Internal Revenue Code allows businesses to immediately deduct the full purchase price of qualifying equipment and other business assets in the year of purchase rather than depreciating over multiple years. The deduction limit is $1,160,000 in 2023, with a phase-out beginning at $2,890,000 in total asset purchases. Qualifying property includes equipment, machinery, computers, vehicles (with limits), and certain improvements to commercial real estate. Section 179 is limited to the business taxable income — it cannot create a loss. Bonus depreciation is a separate provision that provides additional first-year deductions beyond Section 179.
Depreciation reduces taxable income in the year the deduction is taken, producing a tax saving equal to the depreciation amount times the effective tax rate. For a business in the 25% tax bracket, $10,000 in depreciation saves $2,500 in taxes. Accelerated depreciation front-loads these savings — reducing current-year taxes more at the cost of higher taxes in later years when depreciation is exhausted. This deferral has real value because money saved today is worth more than money saved in the future. When a depreciated asset is sold above its book value, the excess over book value is a taxable gain (depreciation recapture) taxed as ordinary income.
Book value is the asset recorded value on the balance sheet at any point in time: Book Value = Original Cost - Accumulated Depreciation. At purchase, book value equals cost. After each period of depreciation, book value declines by the depreciation amount until it reaches the salvage value at the end of useful life. Book value has no inherent relationship to market value — an asset may be worth far more or less than its book value depending on market conditions, obsolescence, and maintenance. When a business sells an asset, the taxable gain or loss is calculated as: Sale Price - Book Value at time of sale.