📉 Depreciation Calculator

Depreciation is the systematic allocation of an asset's cost over its useful life. Rather than recording the entire purchase price as an expense in the first year, businesses spread the cost across multiple years to match the revenue the asset helps generate. This principle, known as the matching concept, is a cornerstone of accrual accounting and ensures that financial statements accurately reflect a company's profitability over time.

There are three primary methods used to calculate depreciation, each with distinct characteristics. The straight-line method spreads the depreciable amount evenly across every year of the asset's life, producing a constant annual expense. The declining balance method, including the commonly used double-declining balance variant, applies a fixed percentage to the remaining book value each year, resulting in larger deductions early in the asset's life and smaller ones later. This accelerated approach can be advantageous for tax purposes, as it front-loads deductions and defers tax liabilities. The sum-of-the-years'-digits (SYD) method also accelerates depreciation but less aggressively than declining balance, offering a middle ground between the two extremes.

Understanding these methods is essential for business owners, accountants, and financial analysts, because the choice of depreciation method affects net income, tax obligations, asset turnover ratios, and key financial metrics. Tax authorities such as the IRS publish detailed guidelines — for example, Publication 946 — that specify which methods are permitted and how they should be applied to different classes of property.

The three depreciation methods each use a distinct formula. Straight-line method: Annual Depreciation = (Cost − Salvage Value) ÷ Useful Life. For a $50,000 asset with $5,000 salvage and 5-year life, the annual depreciation is ($50,000 − $5,000) ÷ 5 = $9,000 per year, and the book value declines evenly from $50,000 to $5,000.

Double-declining balance (200%): The straight-line rate is 1 ÷ Life, doubled to 2 ÷ Life. Each year, multiply the current book value by this rate. For the same asset, Year 1 depreciation = $50,000 × (2 ÷ 5) = $20,000. When the straight-line amount on the remaining balance exceeds the declining-balance amount, the method switches to straight-line to maximize the deduction. The asset is never depreciated below its salvage value.

Sum-of-the-years'-digits (SYD): First, compute the sum of the years' digits using the formula n(n+1) ÷ 2, where n is the useful life. For 5 years, SYD = 5 × 6 ÷ 2 = 15. Then for year k, depreciation = (Cost − Salvage) × (n − k + 1) ÷ SYD. Year 1 depreciation = $45,000 × 5 ÷ 15 = $15,000, which is larger than the straight-line amount but smaller than the declining-balance deduction.

Based on a $50,000 asset with $5,000 salvage value and 5-year useful life. All three methods fully depreciate the $45,000 depreciable base, but the timing differs significantly.

For U.S. tax purposes, the IRS assigns assets to MACRS classes with fixed recovery periods.

1. Enter the total purchase cost of your asset in the Asset Cost field, including taxes, shipping, and installation charges.
2. Input the Salvage Value — the estimated amount the asset will be worth at the end of its useful life. This can be zero for fully consumed assets.
3. Specify the Useful Life in years — how long you expect the asset to remain in productive service for your business.
4. Select a Depreciation Method from the dropdown: Straight-Line for even depreciation, Declining Balance for accelerated front-loaded deductions, or Sum-of-the-Years'-Digits for a moderate accelerated approach.
5. Click Calculate to instantly see a year-by-year breakdown showing the beginning book value, annual depreciation expense, and ending book value for each year of the asset's life.

Which depreciation method should I choose?

It depends on your asset type and financial goals. Straight-line is simplest and best for assets that lose value evenly, like buildings and furniture. Declining balance and SYD are better for assets that lose more value early, like vehicles and computers. For U.S. taxes, the IRS generally requires MACRS, which is a form of declining balance. Consult a CPA for guidance on your specific situation.

What is salvage value and how do I determine it?

Salvage value, also called residual value, is the estimated amount an asset will be worth at the end of its useful life. You can base it on industry guides, comparable used-equipment sales, or a percentage of the original cost — typically 5 to 10 percent. Salvage value is subtracted from the cost before calculating depreciation, so the asset is never depreciated below this amount.

What is the difference between book value and market value?

Book value is the asset's original cost minus accumulated depreciation, and it appears on your balance sheet. Market value is what the asset would actually sell for on the open market. These two figures can diverge significantly, especially for assets like real estate that may appreciate, or technology that becomes obsolete faster than its depreciation schedule suggests.

Can I change depreciation methods after I have started?

Generally, you should continue using the same method for the asset's entire life. The IRS considers switching methods a change in accounting principle that requires filing Form 3115. For book purposes, any change should be disclosed in financial statement footnotes. Always consult a tax professional before making changes to your depreciation approach.

What happens when an asset is fully depreciated but still in use?

Once the book value reaches salvage value, depreciation stops. The asset remains on the balance sheet at its salvage value and continues to be used in business operations. If you later sell or dispose of the asset, you may recognize a gain or loss equal to the difference between the sale proceeds and the remaining book value.

This tool is for informational purposes only and does not constitute financial advice. Consult a qualified financial professional for advice specific to your situation.

Choosing the right depreciation method depends on your business goals and the nature of the asset. The straight-line method is simplest and best for assets that lose value evenly over time, such as office furniture, buildings, or fixtures. Accelerated methods like double-declining balance and SYD are ideal for assets that lose more value in their early years — vehicles, computers, and manufacturing equipment — because they better match the actual pattern of economic benefit. For U.S. tax purposes, the IRS requires most assets to be depreciated using the MACRS system, which is itself a form of declining balance. Always consult IRS Publication 946 or a certified public accountant before making final decisions. Keep detailed records of purchase prices, improvement costs, and the date each asset was placed in service, as these determine your depreciation schedule. Remember that different methods can be used for book and tax purposes simultaneously — many companies use straight-line for financial reporting and accelerated methods for tax filings to defer tax liabilities.