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The declining balance method is an accelerated depreciation technique that applies a fixed percentage rate to an asset's remaining book value each year, producing larger depreciation charges early in the asset's life and smaller ones later. Unlike straight-line depreciation, which spreads cost evenly, the declining balance front-loads the expense. The logic is that assets deliver more economic benefit in their early years before wear, obsolescence, or reduced productivity sets in.
The most common variant is the double-declining balance method, which applies twice the straight-line rate to the beginning-of-year book value.
Start by determining the straight-line depreciation rate, which is 1 divided by the asset's useful life in years. For a five-year asset, the straight-line rate is 20%. The double-declining balance rate is 40%, which is that rate doubled.
Apply the 40% rate to the asset's book value at the start of each year. Year one on a $50,000 asset: $50,000 multiplied by 40% equals $20,000 depreciation. Year two book value is $30,000, so depreciation is $12,000. Year three is $18,000 book value, so depreciation is $7,200. The balance declines each year because the rate applies to a smaller base.
A mathematical problem emerges with a pure declining balance calculation: the asset never fully depreciates to zero because you always multiply by a percentage of a remaining balance. To address this, most companies switch to straight-line depreciation in the year where straight-line would produce a larger charge than the declining balance method.
In the example above, by years four and five, straight-line depreciation on the remaining book value would exceed the double-declining balance charge. At that point, accounting practice and tax rules allow the switch so the full cost is eventually recovered.
| Declining Balance | Straight-Line | |
|---|---|---|
| Depreciation Pattern | Large early charges, smaller later charges | Equal charges every year |
| Early-Year Tax Benefit | Higher deductions reduce taxable income sooner | Deductions spread evenly; no front-loading benefit |
| Best For | Technology, vehicles, equipment that loses value quickly | Buildings, long-lived assets with steady utility |
| Profit Impact | Lower reported profit in early years | Consistent profit impact each year |
For U.S. federal income tax purposes, the IRS does not use company-chosen depreciation methods. It uses the Modified Accelerated Cost Recovery System (MACRS), which prescribes specific recovery periods and methods for different asset classes. Most personal property under MACRS uses the 200% declining balance method (double-declining balance) for the first portion of the recovery period, then switches to straight-line.
Tax depreciation and book depreciation can differ significantly. A company may use straight-line for its financial statements to present stable earnings while using MACRS double-declining balance on its tax return to accelerate deductions. This creates a deferred tax liability on the balance sheet representing the future tax due when book value catches up to the lower tax basis.
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