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The gradual decline in the financial value of property used to produce income due to its increasing age and eventual obsolescence, which is measured by a formula that takes into account these factors in addition to the cost of the property and its estimated useful life.

Depreciation is a concept used in accounting to measure the decline in an asset's value spread over the asset's economic life. Depreciation allows for future investment that is required to replace used-up assets. In addition, the U.S. Internal Revenue Service allows a reasonable deduction for depreciation as a business expense in determining taxable net income. This deduction is used only for property that generates income. For example, a building used for rent income can be depreciated, but a building used as a residence cannot be depreciated.

Depreciation arises from a strong public policy in favor of investment. Income-producing assets such as machines, trucks, tools, and structures have a limited useful life—that is, they wear out and grow obsolete while generating income. In effect, a taxpayer using such assets in business is gradually selling those assets. To encourage continued investment, part of the gross income should be seen as a return on a capital expenditure, and not as profit. Accordingly, tax law has developed to separate the return of capital amounts from net income.

Generally, depreciation covers deterioration from use, age, and exposure to the elements. An asset likely to become obsolete, such as a computer system, can also be depreciated. An asset that is damaged or destroyed by fire, accident, or disaster cannot be depreciated. An asset that is used in one year cannot be depreciated; instead, the loss on such an asset may be written off as a business expense.

Several methods are used for depreciating income-producing business assets. The most common and simplest is the straight-line method. Straight-line depreciation is figured by first taking the original cost of an asset and subtracting the estimated value of the asset at the end of its useful life, to arrive at the depreciable basis. Then, to determine the annual depreciation for the asset, the depreciable basis is divided by the estimated life span of the asset. For example, if a manufacturing machine costs $1,200 and is expected to be worth $200 at the end of its useful life, its depreciable basis is $1,000. If the useful life span of the machine is 10 years, the depreciation each year is $100 ($1,000 divided by 10 years). Thus, $100 can be deducted from the business's taxable net income each year for 10 years.

Accelerated depreciation provides a larger tax write-off for the early years of an asset. Various methods are used to accelerate depreciation. One method, called declining-balance depreciation, is calculated by deducting a percentage up to two times higher than that recognized by the straight-line method, and applying that percentage to the undepreciated balance at the start of each tax period. For the manufacturing machine example, the business could deduct up to $200 (20 percent of $1,000) in the first year, $160 (20 percent of the balance, $800) the second year, and so on. As soon as the amount of depreciation under the declining-balance method would be less than that under the straight-line method (in our example, $100), the straight-line method is used to finish depreciating the asset.

Another method of accelerating depreciation is the sum-of-the-years method. This is calculated by multiplying an asset's depreciable basis by a particular fraction. The fraction used to determine the deductible amount is figured by adding the number of years of the asset's useful life. For example, for a 10-year useful life span, one would add 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, to arrive at 55. This is the denominator of the fraction. The numerator is the actual number of useful years for the machine, 10. The fraction is thus 10/55. This fraction is multiplied by the depreciable basis ($1,000) to arrive at the depreciation deduction for the first year. For the second year, the fraction 9/55 is multiplied against the depreciable basis, and so on until the end of the asset's useful life. Sum-of-years is a more gradual form of accelerated depreciation than declining-balance depreciation.

Depreciation is allowed by the government as a reward to those investing in business. In 1981, the Accelerated Cost Recovery System (ACRS) (I.R.C. § 168) was authorized by Congress for use as a tax accounting method to recover capital costs for most tangible depreciable property. ACRS uses accelerated methods applied over predetermined recovery periods shorter than, and unrelated to, the useful life of assets. ACRS covers depreciation for most depreciable property, and more quickly than prior law permitted. Not all property has a predetermined rate of depreciation under ACRS. The Internal Revenue Code indicates which assets are covered by ACRS.

Further readings

Brestoff, Nelson E. 1985. How to Write Off Your Down Payment. New York: Putnam.

Hudson, David M., and Stephen A. Lind. 1994. Federal Income Taxation. 5th ed. St. Paul, Minn.: West.


Income Tax; Taxable Income.


n. the actual or theoretical gradual loss of value of an asset (particularly business equipment or buildings) through increasing age, natural wear and tear, or deterioration, even though the item may retain or even increase its replacement value due to inflation. Depreciation may be used as a business deduction for income tax reduction, spread out over the expected useful life of the asset (straight line) or at a higher rate in the early years of use (accelerated).

See: contempt, criticism, damage, decline, decrease, denunciation, depression, deterioration, diatribe, disapprobation, disdain, disparagement, disregard, disrespect, revilement, stricture, wear and tear


the accounting practice whereby the cost of a fixed asset is written off over the period of its expected useful life. The amount written off is a recognized deduction in computing the profits of a business. It is not allowable for tax purposes but CAPITAL ALLOWANCES may be given.
References in periodicals archive ?
Statictical characteristic of the obsolescence and physical depreciation level of the standardized development objects that are in difficult geoclimatic conditions we can see in Table 2 (State building norms of Ukraine: Engineering protection of territories, buildings and structures on the bars and landslides 1998).
While the estimated depreciation rates are not far from the authors' a priori views, it must be remembered that they are estimates of physical depreciation rates.
Empirical estimates of the physical depreciation show that it is small but significant.
Costs of revenues include compensation for the Company's drillers, surveyors, MWD hands and related personnel; third party equipment rentals; costs recognized in recognition of physical depreciation associated with the Company's motor usage; as well as other direct and allocable indirect expenses related to the Company's directional and surveying services and equipment.
Patel then hired his own appraiser, who employed a cost-based approach only recognizing physical depreciation of the motel.
Don't confuse the issue of adequate insurance with that of valuation: in the example above, the amounts discussed represent the replacement cost value of the property with no deduction taken for physical depreciation based on age or condition.
If it were not for this last group of circumstances, the mortgage lender could evaluate the borrower's risks fairly accurately and would be able to make loans at rates which would cover the cost of money and cost of mortgage operations and on terms which would barely keep the amortization ahead of the physical depreciation.
This term, simply put, serves to value a building at what it would cost to repair or replace the property at current-costs of labor and materials less physical depreciation based primarily upon age and condition.
Physical depreciation was computed based on the effective average age of the buildings and using the economic lives estimated in Section 97 of the MVS.