What is straight-line depreciation?

Straight-line depreciation spreads the cost of an asset evenly over its useful life. The annual depreciation expense equals (Asset Cost - Salvage Value) / Useful Life. It is the simplest and most commonly used method, ideal for assets that lose value at a consistent rate over time.

What is double declining balance depreciation?

Double declining balance is an accelerated depreciation method that applies twice the straight-line rate to the declining book value each year. It front-loads depreciation expense, resulting in larger deductions in earlier years. This method is useful for assets that lose value quickly, such as vehicles and technology equipment.

What is salvage value?

Salvage value (also called residual value) is the estimated amount an asset will be worth at the end of its useful life. It represents the expected resale or scrap value after the asset is fully depreciated. The depreciable base of an asset is its cost minus its salvage value.

Which depreciation method should I use?

The best method depends on your situation. Straight-line is simplest and works well for most assets. Accelerated methods like double declining balance or sum-of-years-digits are better for assets that lose value quickly and can provide larger tax deductions in early years. Consult a tax professional to determine the best approach for your specific assets and tax situation.

Depreciation Calculator

Calculate annual depreciation and book value using straight-line, declining balance, double declining, or sum-of-years methods.

Asset Cost ($)

Salvage Value ($)

Useful Life (Years)

Depreciation Method

Year 1 Depreciation

Total Depreciation

Depreciable Base

Year	Depreciation	Accumulated	Book Value

Understanding Asset Depreciation

Depreciation is an accounting method that allocates the cost of a tangible asset over its useful life. Rather than expensing the entire purchase price in the year of acquisition, businesses spread the cost across multiple years to match the expense with the revenue the asset generates. This is a fundamental concept in accounting and tax planning.

Common Depreciation Methods

The straight-line method divides the depreciable base (cost minus salvage value) equally across all years. Declining balance methods apply a fixed percentage to the remaining book value each year, resulting in higher depreciation in early years and lower amounts later. The sum-of-years-digits method is another accelerated approach that uses a fraction based on the remaining useful life divided by the sum of all year digits.

Tax Implications

Accelerated depreciation methods like double declining balance allow businesses to claim larger deductions sooner, reducing taxable income in the early years of an asset's life. This can be advantageous for cash flow, though the total depreciation over the asset's life remains the same regardless of method. The IRS allows specific methods under MACRS (Modified Accelerated Cost Recovery System) for tax purposes.

This calculator helps you compare how different methods affect the annual depreciation expense and the remaining book value. Understanding these differences is essential for financial reporting, tax planning, and asset management decisions.

Formulas

1. Straight-Line:

Annual Depreciation = (Cost − Salvage Value) / Useful Life

2. Declining Balance:

Depreciation = Book Value × (Depreciation Rate)

3. Double Declining Balance:

Depreciation = Book Value × (2 / Useful Life)

4. Sum-of-Years-Digits:

Depreciation = (Cost − Salvage) × (Remaining Life / Sum of Years Digits)

Where:

Cost = original purchase price of the asset
Salvage Value = estimated value at end of useful life
Useful Life = number of years the asset is expected to be used
Book Value = current value of the asset (cost minus accumulated depreciation)
Sum of Years Digits = n(n+1)/2, where n = useful life in years

Example Calculation

Scenario: Equipment costing $50,000 with $5,000 salvage value and 5-year useful life

Straight-Line: ($50,000 − $5,000) / 5 = $9,000 per year
Double Declining: Year 1 = $50,000 × (2/5) = $20,000; Year 2 = $30,000 × 0.4 = $12,000
Sum-of-Years-Digits: Sum = 5(6)/2 = 15; Year 1 = $45,000 × 5/15 = $15,000; Year 2 = $45,000 × 4/15 = $12,000
Result: Accelerated methods front-load larger deductions in early years, while straight-line spreads the cost evenly

This calculator is for informational purposes only and does not constitute financial, tax, or legal advice. Always consult a qualified professional for decisions specific to your situation.