Returns the depreciation of an asset for a specified period using the double-declining balance method or some other method you specify.
 | Cost | is the initial cost of the asset. |
| Salvage | is the value at the end of the depreciation (sometimes called the salvage value of the asset). |
| Life | is the number of periods over which the asset is being depreciated (sometimes called the useful life of the asset). |
| Period | is the period for which you want to calculate the depreciation. Period must use the same units as life. |
 | Factor | is the rate at which the balance declines. If factor is omitted, it is assumed to be 2 (the double-declining balance method). |
