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Why Assets Lose Value on Paper
When a business buys equipment, a vehicle, or furniture, the cost is rarely counted as a single-year expense. Instead, the value is spread over the years the asset is useful. That spreading is called depreciation. It matches the cost to the years that benefit from the asset, and it gives a more honest picture of yearly profit than expensing everything at once. A delivery van that costs 30,000 dollars and lasts six years does not make one year look terrible and the next five look free. Depreciation smooths the cost across its working life, and the remaining book value shows what the asset is still worth on the books.
Straight-Line: Equal Slices Each Year
Straight-line depreciation is the simplest method. Subtract the salvage value, which is what you expect the asset to be worth at the end, from the cost, then divide by the useful life in years. A 10,000 dollar machine with a 1,000 dollar salvage value and a five-year life depreciates by 1,800 dollars every year. Each year the book value falls by the same amount: 8,200, then 6,400, then 4,600, then 2,800, then 1,000. This method suits assets that wear out evenly, such as office furniture or simple tools, and it is easy to explain to a partner, a lender, or a tax preparer.
Declining Balance: Larger Amounts Early
Declining balance depreciation front-loads the expense. Each year you apply a fixed percentage to the current book value, not the original cost, so the amount falls over time. Double declining balance uses twice the straight-line rate. For a five-year asset, the rate is 40 percent. A 10,000 dollar machine loses 4,000 dollars in year one, then 2,400 in year two, then 1,440, then 864, and the final year is adjusted so the book value lands exactly on the salvage value. This method suits assets that lose value fast early, such as computers and vehicles, and it reflects the reality that newer equipment does the heaviest work.
Choosing a Method and a Life
The method changes reported profit year by year, even though the total depreciated amount is the same: cost minus salvage value in both cases. Declining balance lowers early profit and raises later profit, while straight-line keeps profit steady. Tax rules in your country may require or allow specific methods and lives, and switching methods later can be restricted, so do not choose on a whim. Useful life is an estimate, not a fact. A laptop may last three years in heavy daily use and five in light use. Be realistic rather than optimistic: an overstated life understates yearly cost and overstates profit until replacement arrives early.
Book Value Is Not Market Value
Book value is an accounting record, not a price tag. A machine with a book value of 2,000 dollars might sell for 5,000 dollars because the market changed, or for nothing because a newer model replaced it. Depreciation schedules help with planning and taxes, but they do not tell you what a buyer will pay. When you sell an asset, compare the sale price with the book value at that date: selling above book value can create a taxable gain, and selling below can create a loss, depending on your local rules. Keep purchase records, dates, and method choices together so that moment is simple.
How to Use This Calculator
Enter the asset cost, the salvage value, the useful life in years, and the method. The tool builds the full yearly schedule with depreciation, accumulated depreciation, and book value, and it shows the straight-line yearly amount for comparison even when you choose declining balance. Check that the final book value equals your salvage value. If it does not, recheck your inputs. This tool is a planning and learning aid based on the two methods shown. It is not tax advice, and real tax depreciation follows your local rules, so confirm the method and life with a qualified professional before filing anything.
Disclaimer: All results are estimates only and are not financial or tax advice. Check with a qualified professional before making financial decisions.