Asset Depreciation Calculator
Compute annual depreciation expense for any asset using straight-line, declining balance, or sum-of-years-digits methods. Essential for accountants, small business owners, and financial planners preparing tax or GAAP financial statements.
About this calculator
Depreciation spreads the cost of a long-term asset over its useful life. This calculator supports three standard methods. Straight-Line (SL): Annual Depreciation = (Cost − Salvage Value) / Useful Life — equal expense every year. Double Declining Balance (DDB): Depreciation in Year N = max(0, Cost × (1 − 2/Useful Life)^(N−1) × (2/Useful Life)) — front-loads larger expenses in early years. Sum-of-Years-Digits (SYD): Depreciation in Year N = (Cost − Salvage Value) × (Useful Life − N + 1) / (Useful Life × (Useful Life + 1) / 2) — also accelerated but smoother than DDB. Straight-line is simplest and widely used for GAAP reporting. Accelerated methods (DDB and SYD) reduce taxable income more in early years, benefiting cash flow. Salvage value is the estimated residual value at the end of the asset's useful life.
How to use
Suppose you buy a delivery truck for $50,000, expect a $5,000 salvage value, and estimate a 5-year useful life. For Straight-Line in any year: (50,000 − 5,000) / 5 = $9,000/year. For Double Declining Balance in Year 2: 50,000 × (1 − 2/5)^(2−1) × (2/5) = 50,000 × 0.6 × 0.4 = $12,000. For Sum-of-Years-Digits in Year 2: (50,000 − 5,000) × (5 − 2 + 1) / (5 × 6 / 2) = 45,000 × 4/15 = $12,000. Enter your values, select a method and year, and the calculator returns the precise depreciation expense instantly.
Frequently asked questions
What is the difference between straight-line and declining balance depreciation?
Straight-line depreciation allocates an equal expense each year over the asset's useful life, making it simple to forecast and preferred for financial reporting. Declining balance (especially double declining balance) applies a fixed percentage to the asset's remaining book value each year, resulting in larger deductions early in the asset's life and smaller ones later. Accelerated methods like declining balance are often used for tax purposes because deferring taxable income to later years improves current cash flow. The choice of method does not affect total depreciation over the asset's life — only the timing of when expense is recognized.
When should I use sum-of-years-digits depreciation instead of straight-line?
Sum-of-years-digits is a good choice when an asset is expected to be most productive and generate the most revenue in its early years, making it logical to match higher depreciation expense to those higher-earning periods. It is an accelerated method, so like double declining balance it front-loads expenses, but it declines more gradually and never requires a switch to straight-line (unlike DDB). SYD is commonly used for assets like vehicles, computers, and machinery that lose market value quickly. It is accepted under US GAAP and IFRS, though tax regulations in many jurisdictions prescribe specific methods.
How does salvage value affect the depreciation calculation for each method?
Salvage value (also called residual value) is the estimated worth of the asset at the end of its useful life, and it caps the total amount that can be depreciated. For straight-line and sum-of-years-digits methods, only the depreciable base — (Cost − Salvage Value) — is spread over the useful life, so a higher salvage value directly reduces annual expense. For double declining balance, salvage value does not directly enter the annual formula, but depreciation stops once the asset's book value reaches the salvage value (the max(0, ...) clause prevents over-depreciation). Accurately estimating salvage value at purchase is therefore important for all three methods.