Asset Depreciation Calculator
Calculate annual depreciation expense for any year of an asset's life using straight-line, double declining balance, or sum-of-years-digits methods. Essential for accountants, business owners, and tax planners tracking asset value over time.
About this calculator
Depreciation spreads the cost of an asset over its useful life. Three common methods exist. Straight-line depreciation is the simplest: Annual Depreciation = (Cost − Salvage) / Years, giving equal expense each year. Double declining balance (DDB) front-loads expenses: Depreciation for Year N = (Cost − Salvage) × (1 − 2/Years)^(N−1) × (2/Years), applying a fixed rate to the remaining book value. Sum-of-years-digits (SYD) also accelerates depreciation: Depreciation for Year N = (Cost − Salvage) × (Years − N + 1) / (Years × (Years + 1) / 2). Accelerated methods like DDB and SYD are preferred when an asset loses value quickly early in its life, while straight-line suits assets that depreciate steadily. Salvage value is the estimated residual value at end of useful life.
How to use
Suppose you purchase equipment for $10,000 with a $1,000 salvage value and a 5-year useful life. For Year 2 using the sum-of-years-digits method: the SYD denominator = 5 × (5+1)/2 = 15. Year 2 numerator = 5 − 2 + 1 = 4. Depreciation = ($10,000 − $1,000) × 4/15 = $9,000 × 0.2667 = $2,400. Using straight-line instead: ($10,000 − $1,000) / 5 = $1,800 per year. Using DDB for Year 2: $9,000 × (1 − 2/5)^1 × (2/5) = $9,000 × 0.6 × 0.4 = $2,160.
Frequently asked questions
What is the difference between straight-line and double declining balance depreciation?
Straight-line depreciation allocates an equal expense every year over the asset's useful life, making it simple and predictable. Double declining balance is an accelerated method that applies twice the straight-line rate to the asset's remaining book value, resulting in higher deductions in early years and lower ones later. Businesses choose DDB when an asset is most productive and loses value fastest at the beginning of its life, such as technology equipment. Straight-line is preferred for assets that provide consistent value, like buildings.
When should I use the sum-of-years-digits depreciation method?
Sum-of-years-digits (SYD) is an accelerated depreciation method best used when an asset generates more revenue or experiences more wear in its earlier years. It is commonly applied to vehicles, machinery, and other equipment that degrades faster initially. SYD produces higher depreciation expense in early years compared to straight-line but is slightly less aggressive than double declining balance. It can be advantageous for tax purposes, allowing businesses to defer tax liability to later periods when the asset contributes less.
How does salvage value affect depreciation calculations?
Salvage value is the estimated amount an asset will be worth at the end of its useful life, and it reduces the total depreciable base. Under all three methods, depreciation is calculated on (Cost − Salvage Value) rather than the full purchase price. Setting a higher salvage value results in lower annual depreciation expenses, while a $0 salvage value means the entire cost is depreciated. Accurately estimating salvage value is important for financial reporting and tax compliance, as overestimating it understates expenses and underestimating it overstates them.