Depreciation Calculator

What depreciation is doing

Depreciation allocates the recoverable cost of a business or income-producing asset across the periods that benefit from using it. Instead of expensing the full asset cost immediately, the cost is spread over time according to the method chosen and the useful-life assumption used for the schedule.

That is why depreciation is both an accounting concept and a planning concept. The same asset can produce different year-by-year expense patterns depending on whether you use straight-line or a declining-balance method, even though the total depreciable base recovered over the schedule is the same once salvage value is respected.

Straight-line versus declining-balance

Straight-line depreciation spreads the depreciable base evenly across the useful life. Each year carries the same depreciation expense, which makes the method easy to forecast and explain.

Declining-balance methods apply a higher percentage to the asset's opening book value in earlier years, which produces larger early deductions and smaller later ones. Many schedules switch to straight-line once the remaining straight-line amount becomes larger than the declining-balance amount, because that finishes the depreciable base more efficiently while still respecting the salvage-value floor.

Where sum-of-years'-digits fits

Sum-of-years'-digits depreciation is another accelerated method. Instead of applying a fixed declining-balance rate to opening book value, it weights each year by the remaining useful life. In a five-year schedule, the first year receives five parts out of a total of fifteen, the second year receives four parts, and the pattern continues until the salvage floor is reached.

That makes a sum-of-years'-digits depreciation calculator useful when you want an accelerated expense curve but also want the annual amounts to decline in a more transparent arithmetic pattern. It can sit between the simplicity of straight-line depreciation and the sharper early-year effect of a double-declining-balance schedule.

The method-comparison cards in the calculator use the same asset cost, salvage value, and useful life across all methods. That gives you a cleaner view of timing: the total depreciable base is the same, but first-year depreciation, peak annual expense, accumulated depreciation, and book value can vary significantly.

Worked example: comparing the same asset under different methods

Suppose an asset costs 35,000, has a salvage value of 5,000, and a useful life of 5 years. Straight-line depreciation produces a steady 6,000 of annual expense. A 200% declining-balance schedule produces a much larger first-year expense, then smaller later-year amounts as the book value falls.

On the same inputs, sum-of-years'-digits depreciation starts at 10,000 in year one because five of the fifteen useful-life digits are assigned to the first year. A 200% declining-balance method starts even higher on these assumptions, while straight-line stays flat. The calculator shows these alternatives side by side so the timing choice is visible before you rely on the schedule.

The calculator shows both the headline first-year expense and the full annual schedule. That helps you compare whether you want a steadier planning view or a more front-loaded depreciation pattern for the same depreciable base.

How to choose a method for planning

For many planning questions, the best depreciation method is the one that matches the decision you are trying to explain. Straight-line depreciation is often easiest for budgeting because the annual amount stays level. Declining-balance and sum-of-years'-digits schedules are better when you want to see how accelerated depreciation changes early-year expense and book value.

The scenario presets are intentionally neutral examples rather than tax elections. Use the equipment schedule to inspect a common five-year asset, the furniture schedule to see a longer steady-life pattern, and the technology schedule to compare faster front-loaded depreciation. You can then overwrite the cost, salvage value, useful life, and method to match your own asset.

Because this is a universal planning calculator, it does not assume a country-specific recovery class, MACRS life, bonus depreciation rule, Section 179 election, or local tax convention. Use it for schedule comparison and internal forecasting, then check the governing rules before using any result for filing or audited reporting.

How to use the schedule

Use the schedule to understand how quickly book value falls, how much depreciation is recognized each year, and when a declining-balance schedule begins to resemble straight-line. It is useful for budgeting, internal planning, and explaining the effect of different methods to stakeholders.

The annual schedule also works as a quick depreciation table. Each row shows opening book value, depreciation expense, accumulated depreciation, and closing book value, so you can trace the asset from original cost down to its salvage value.

This tool is intentionally simplified. It does not attempt to reproduce every jurisdiction-specific tax convention, recovery class, or mid-period rule. For actual filings or audited statements, compare the result with the tax or accounting rules that govern the asset.