Depreciation is the lost in value of physical assets through its use. The yearly deposits into the depreciation fund are called depreciation charges. The depreciation fund is the portions of a given amount at the end of its useful life or the difference between the original cost of the asset and the sum in the depreciation fund is called the book value of the asset.
The calculation and reporting of depreciation is based upon two accounting principles:
- Cost principle. This principle requires that the Depreciation Expense reported on the income statement, and the asset amount that is reported on the balance sheet, should be based on the historical (original) cost of the asset. (The amounts should not be based on the cost to replace the asset, or on the current market value of the asset, etc.)
- Matching principle. This principle requires that the asset's cost be allocated to Depreciation Expense over the life of the asset. In effect the cost of the asset is divided up with some of the cost being reported on each of the income statements issued during the life of the asset. By assigning a portion of the asset's cost to various income statements, the accountant is matching a portion of the asset's cost with each period in which the asset is used. Hopefully this also means that the asset's cost is being matched with the revenues earned by using the asset.
Here's an example of how to get an objects depreciation value and schedule:
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