Using the declining fixed balance method, calculate the depreciation value of an asset over a given period.
grammar
DB(cost,salvage,life,period,month)
cost indicates the original asset value.
salvage is the value of the asset at the end of depreciation (also known as the salvage value of the asset).
life is the period of depreciation (sometimes called the useful life of the asset).
period is the period during which the depreciation value needs to be calculated. Period must use the same unit as life.
month indicates the number of months in the first year. If it is omitted, assume 12.
Instructions
- The decreasing fixed balance method is used to calculate the depreciation value of an asset at a fixed interest rate. The function DB uses the following calculation formula to calculate the depreciation value for a period:
(cost – total value of prior depreciation) * rate
Formula:
rate = 1 – ((salvage/cost) ^ (1 / life)), save 3 decimal places
- Depreciation in the first and last periods is a special case. For the first period, the formula for calculating the function DB is:
cost * rate * month / 12
- For the last period, the formula for calculating the function DB is:
((cost – total value of prior depreciation) * rate * (12-month)) / 12
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