Depreciation Calculator
Calculate asset depreciation free with straight line, declining balance, DDB, or SYD methods. Get annual depreciation, book value, and a full schedule.
Last updated: September 24, 2026
Table of Contents
Calculator
Use our interactive depreciation tool below to model your asset write-off schedule in real time. Switch dynamically between Straight-Line (SL), Double-Declining Balance (200% DDB), 150% Declining Balance (1.5x DB), and Sum-of-Years' Digits (SYD). Adjust initial purchase cost, salvage floor, and useful lifespan to project annual expense, accumulated write-offs, ending net book value, and download full GAAP audit schedules directly to CSV.
Live Depreciation Schedule & Visualizer
Interactive year-by-year amortization of asset book value across all standard accounting methods.
| Year | Beginning Book Value | Rate | Depreciation Expense | Accumulated | Ending Book Value | Depreciated % |
|---|---|---|---|---|---|---|
| Year 1 | $10,000 | 20.0% | $1,800 | $1,800 | $8,200 | 20% |
| Year 2 | $8,200 | 20.0% | $1,800 | $3,600 | $6,400 | 40% |
| Year 3 | $6,400 | 20.0% | $1,800 | $5,400 | $4,600 | 60% |
| Year 4 | $4,600 | 20.0% | $1,800 | $7,200 | $2,800 | 80% |
| Year 5 | $2,800 | 20.0% | $1,800 | $9,000 | $1,000 | 100% |
What is depreciation?
Depreciation is the systematic accounting process of allocating the historical acquisition cost of a tangible fixed asset across its estimated useful economic lifespan. Under the accrual accounting matching principle (governed by US GAAP ASC 360 and IFRS IAS 16), businesses purchase productive capital assets—such as manufacturing machinery, corporate vehicles, technology hardware, and office buildings—to generate ongoing operating revenue.
Because tangible assets inevitably suffer physical wear and tear, mechanical deterioration, and technological obsolescence, their economic value diminishes over time. Rather than expensing the full purchase price in the month or year cash was disbursed, accounting standards require firms to capitalize the asset on the balance sheet and record periodic depreciation expense on the income statement, matching the cost of the equipment to the specific accounting intervals that benefit from its productivity.
The Balance Sheet Mechanism:
On financial statements, annual depreciation is booked as an operational expense on the Income Statement and credited to a contra-asset account labeled Accumulated Depreciation on the Balance Sheet. This reduces the carrying amount of the asset to its true Net Book Value without altering the recorded historical cost:
Net Book Value = Historical Asset Cost - Accumulated Depreciation
Crucially, depreciation is a non-cash expense. Although it directly lowers reported earnings before taxes (EBT) and provides a valuable tax shield, it does not represent an actual cash outflow in subsequent years after the initial purchase.
How to calculate depreciation
Calculating asset depreciation requires four fundamental financial variables. Follow these standardized accounting steps to compute your depreciation schedule accurately:
The gross total purchase expenditure, including invoice price, freight shipping, sales tax, customs duties, installation charges, and initial electrical or site preparation necessary to make the asset ready for operational service.
The anticipated net realizable value, scrap proceeds, or secondary market resale price the company expects to collect upon retiring or disposing of the asset at the conclusion of its useful life.
The estimated duration in calendar years (or production units/machine hours) over which the enterprise expects the asset to remain economically productive and operational.
The total cumulative dollar sum eligible for write-off over the asset's lifespan. An asset can never be depreciated beyond this base or below its salvage floor.
Core Straight-Line Depreciation Formula
Annual Depreciation Expense = (Asset Cost - Salvage Value) ÷ Useful Life
Worked Numerical Example: A business acquires packaging equipment for $10,000, anticipates a $1,000 salvage recovery, and estimates an active operating lifespan of 5 years.
• Depreciable Base = $10,000 - $1,000 = $9,000.
• Annual Depreciation = $9,000 ÷ 5 = $1,800/year.
• Annual Depreciation Rate = 1 ÷ 5 = 20.0%.
• Book Value at Year 2 = $10,000 - ($1,800 × 2) = $6,400.
• Book Value at Year 5 = $10,000 - ($1,800 × 5) = $1,000 (matches salvage value exactly).
Pro Tip: While straight-line spreads deductions evenly, accelerated methods (Double-Declining Balance and Sum-of-Years' Digits) allow businesses to front-load write-offs into the earliest years of ownership, creating higher upfront tax deductions when equipment maintenance expenses are low.
Depreciation methods explained
Different business assets lose value at varying velocities. Financial accounting standards (GAAP ASC 360) authorize four primary depreciation methodologies. Here is how each mathematical method works, when to apply it, and its impact on corporate financial statements:
Straight-line depreciation
Straight-line depreciation (SL) is the default, most widely utilized accounting method globally. It divides the net depreciable base equally across each year of the asset's expected lifespan, generating an identical, uniform depreciation expense every reporting period.
Depreciation Rate = 1 ÷ Useful Life in Years
When to use: Best suited for long-term fixed assets whose economic utility and wear occur steadily and predictably, such as commercial buildings, warehouse facilities, leasehold improvements, and standardized office furniture. Straight-line produces stable, predictable operating margins on financial statements.
Declining balance depreciation
Declining balance depreciation (DB) is an accelerated write-off framework that applies a constant percentage rate against the asset's decreasing beginning book value at the start of each fiscal year. Because book value shrinks every year, the dollar deduction decreases with each successive period.
Max Allowable Expense = Beginning Book Value - Salvage Floor
Crucial Accounting Rule: Under declining balance, salvage value is not subtracted from the initial cost when establishing the rate or computing early expenses. Instead, salvage value serves as a strict stopping barrier: once beginning book value reaches salvage value, annual depreciation drops to $0. Common acceleration factors include 150% (1.5x straight-line rate) and 200% (double declining).
Double-declining balance depreciation
Double-declining balance (DDB) is the most aggressive standardized accelerated method, utilizing an acceleration multiplier of 200% (2.0x) the straight-line rate. This front-loads maximum depreciation deductions into the first two years of ownership.
Year 1 Expense = Asset Purchase Cost × (2 ÷ Useful Life)
Subsequent Years = Beginning Book Value × (2 ÷ Useful Life)
Example on a 5-Year Asset: The straight-line rate is 1 ÷ 5 = 20%. The DDB rate is 2 × 20% = 40%. On a $10,000 asset, Year 1 depreciation is a massive $4,000 ($10,000 × 40%), leaving a Year 2 beginning book value of $6,000. Year 2 depreciation is then $2,400 ($6,000 × 40%).
When to use: Ideal for high-tech equipment, computer servers, company automobiles, and manufacturing tooling that experience rapid technological obsolescence or heavy initial market depreciation.
Sum-of-years-digits depreciation
Sum-of-years-digits depreciation (SYD) is an accelerated method that produces a smooth, linear reduction in depreciation each period rather than the steep geometric drop seen in DDB. It calculates depreciation fractions by summing the digits of the asset's useful lifespan.
Year t Depreciation Fraction = (N - t + 1) ÷ SOYD
Depreciation Expense = (Cost - Salvage Value) × Fraction
Example for a 5-Year Asset: SOYD = (5 × 6) ÷ 2 = 15 (1 + 2 + 3 + 4 + 5).
• Year 1: 5/15 = 33.33% of depreciable base ($3,000 on $9,000 base)
• Year 2: 4/15 = 26.67% ($2,400)
• Year 3: 3/15 = 20.00% ($1,800)
• Year 4: 2/15 = 13.33% ($1,200)
• Year 5: 1/15 = 6.67% ($600)
Total Depreciated = $3,000 + $2,400 + $1,800 + $1,200 + $600 = $9,000.
When to use: Perfect for heavy industrial machinery, aviation equipment, and logistics fleets where productivity declines steadily and repair costs increase linearly over time.
Salvage value (residual value) explained
Salvage value (also widely known as residual value, scrap value, or break-up value) represents the estimated dollar amount a business expects to realize upon selling, scrapping, or trading in an asset at the end of its useful economic life, net of anticipated disposal and removal costs.
In corporate accounting, salvage value performs two distinct structural roles depending on the depreciation formula used:
Under Straight-Line and Sum-of-Years' Digits, salvage value is subtracted immediately from initial purchase cost before calculating any annual expenses. If an asset costs $50,000 with a $5,000 salvage estimate, only $45,000 is ever amortized.
Under Declining Balance and Double Declining Balance, salvage value is not deducted from the opening book value. However, GAAP mandates that carrying value can never drop below salvage value. In the final years, depreciation stops once book value equals salvage.
How to Estimate Salvage Value Accurately
Accountants and asset appraisers determine residual values through several reliable approaches:
- Historical company records: Reviewing historical sale prices of retired vehicles or equipment models.
- Manufacturer residual tables: Referencing published commercial resale indices (e.g., Black Book or Kelley Blue Book for automotive fleets).
- Material scrap value: Appraising the intrinsic commodity weight of steel, copper, or aluminum in decommissioned industrial machinery.
- Zero Salvage Tax Convention: For US tax purposes under IRS MACRS (Modified Accelerated Cost Recovery System), salvage value is automatically treated as $0, allowing companies to write off 100% of the asset cost for tax return reporting.
If an asset is retired and sold for more than its remaining net book value, the company records a Gain on Asset Disposal. If it sells for less, a Loss on Asset Disposal is recognized. Depreciation expense itself is never retroactively restated.
Depreciation method comparison
Choosing the optimal depreciation method involves balancing smooth corporate financial statement earnings against aggressive short-term tax shield optimization. The matrix below compares all four primary methods side by side:
| Method | Expense Pattern | Annual Formula | Salvage Deducted Upfront? | Optimal Asset Types | Primary Strategic Advantage |
|---|---|---|---|---|---|
| Straight-Line (SL) | Constant / Uniform | (Cost - Salvage) ÷ Life | Yes | Buildings, office fixtures, long-term tools | Simplest to calculate; creates smooth, predictable earnings for shareholders |
| Double-Declining Balance (DDB) | Rapidly Accelerated (2x SL) | Book Value × (2 ÷ Life) | No (Acts as floor) | Computers, software, tech hardware, vehicles | Maximizes immediate tax shields; offsets high early productivity against low maintenance |
| 150% Declining Balance | Moderately Accelerated (1.5x SL) | Book Value × (1.5 ÷ Life) | No (Acts as floor) | Agricultural equipment, commercial trucks | Accelerates write-off without the extreme drop-off of DDB; standard for MACRS 15/20-yr property |
| Sum-of-Years' Digits (SYD) | Accelerated (Linear slope) | (Cost - Salvage) × (Remaining ÷ SOYD) | Yes | Heavy industrial machinery, aircraft, railcars | Predictable linear acceleration that smoothly expires exactly at salvage value |
• Choose Straight-Line if your company reports to public shareholders, lenders, or investors who prioritize steady operating margins and consistent return on equity (ROE).
• Choose Double-Declining Balance if you are investing in assets that lose 30–50% of their market value the moment they enter service, or if you need to optimize current-year cash flow through accelerated tax deductions.
• Choose Sum-of-Years' Digits if you want accelerated write-offs without having to monitor book value floors or manually switch to straight-line in the final years.
Frequently Asked Questions
What is the difference between depreciation and amortization?
Both depreciation and amortization allocate the cost of a long-term asset across its useful economic life under GAAP and IFRS matching principles. The primary difference is the asset classification: depreciation applies exclusively to tangible fixed assets (physical property such as equipment, machinery, buildings, commercial vehicles, and computers). In contrast, amortization applies to intangible non-physical assets (such as patents, trademarks, copyrights, customer lists, franchises, and proprietary software). Additionally, tangible assets almost always factor in an estimated salvage (residual) value at the end of their lifespan, while intangible assets typically amortize entirely down to a zero balance.
What is straight line depreciation?
Straight-line depreciation is the simplest, most standardized accounting method used to write off an asset. It allocates an equal amount of depreciation expense each year across the asset's entire useful life. The formula is: Annual Depreciation = (Asset Cost - Salvage Value) ÷ Useful Life in Years. For instance, if a business purchases a piece of manufacturing machinery for $10,000 with an expected salvage value of $1,000 and a 5-year life, the annual depreciation expense is ($10,000 - $1,000) ÷ 5 = $1,800 per year.
How do you calculate double declining balance depreciation?
Double-declining balance (DDB) is an accelerated depreciation method that records twice the straight-line rate against the asset's beginning book value each year. Step 1: Calculate the straight-line rate (1 ÷ Useful Life). Step 2: Multiply by 2 (200% factor). Step 3: Multiply this DDB rate by the asset's beginning book value for each period (note: do not subtract salvage value when calculating the rate or initial base). Step 4: Ensure the ending book value never falls below the salvage value. In whichever year the calculated expense would reduce the book value below salvage, depreciation expense is limited to (Beginning Book Value - Salvage Value).
What is salvage value?
Salvage value (also referred to as residual value, scrap value, or break-up value) is the estimated financial amount a company expects to recover by selling or retiring an asset at the end of its useful operational lifespan. Under straight-line and sum-of-years' digits depreciation, salvage value is subtracted from the asset purchase cost upfront to establish the "depreciable base." Under declining balance methods, salvage value is not subtracted upfront, but acts as a strict stopping threshold—an asset can never be depreciated past its salvage value on the balance sheet.
Can depreciation be negative?
No, depreciation expense cannot be negative under standard US GAAP or IFRS accounting guidelines. Physical assets naturally experience wear, mechanical tear, and technological obsolescence; their carrying value declines or remains constant over time. Once an asset is fully written down to its salvage value, annual depreciation stops and remains at $0. If an asset is later sold for a price higher than its remaining book value, the surplus is recorded as a "Gain on Asset Disposal" in other income on the income statement, not as negative depreciation.
💡 IRS MACRS vs. Book Depreciation
Financial Reporting (GAAP): Businesses choose between Straight-Line, DDB, or SYD and must estimate a realistic salvage value floor.
Tax Filings (IRS MACRS): Salvage value is automatically $0. Assets are assigned standardized MACRS recovery periods (e.g. 5-yr computers/vehicles, 7-yr equipment, 27.5-yr residential, 39-yr commercial).
🛡️ Verified Methodology
Formulas adhere strictly to US GAAP (ASC 360) and IFRS (IAS 16) property, plant, and equipment accounting standards with automatic salvage value floor protections.