Returns the depreciation of an asset for a given year using the fixed rate declining-balance method.

DB(originalcost, salvagevalue, lifetime, year, months1styear)

originalcost: the initial cost of the asset.

salvagevalue: is the value at the end of the depreciation (sometimes called the salvage value of the asset).

lifetime: the number of years over which the asset is being depreciated.

year: the year number for which the depreciation is calculated.

months1styear: the number of months in the first year (defaults to 12 if omitted).

To calculate depreciation, DB uses a fixed rate throughout the asset’s life, given by

rate = 1 - (salvagevalue/originalcost)(1/lifetime)

rounded to 3 decimal places.

The depreciation in any year is given by

value_at_start_of_year * rate

where value_at_start_of_year = originalcost - depreciation_so_far.

If months1styear is less than 12 the depreciation rate used for the first and last years is

rate * number_of_months_in_year / 12.

DB(10000, 1000, 5, 1)

returns approximately 3690 in currency units, which is the depreciation in the first year for an asset which cost 10000 and is written down to 1000 over 5 years.

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