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DB function: Description, Usage, Syntax, Examples and Explanation

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What is DB function in Excel?

DB function is one of the Financial functions in Microsoft Excel that returns the depreciation of an asset for a specified period using the fixed-declining balance method.

Syntax of DB function

DB(cost, salvage, life, period, [month])

The DB function syntax has the following arguments:

  • Cost: The initial cost of the asset.
  • Salvage    Required. The value at the end of the depreciation (sometimes called the salvage value of the asset).
  • Life: The number of periods over which the asset is being depreciated (sometimes called the useful life of the asset).
  • Period: The period for which you want to calculate the depreciation. Period must use the same units as life.
  • Month(Optional): The number of months in the first year. If month is omitted, it is assumed to be 12.

DB formula explanation

  • The fixed-declining balance method computes depreciation at a fixed rate. DB uses the following formulas to calculate depreciation for a period:(cost – total depreciation from prior periods) * ratewhere:rate = 1 – ((salvage / cost) ^ (1 / life)), rounded to three decimal places
  • Depreciation for the first and last periods is a special case. For the first period, DB uses this formula:cost * rate * month / 12
  • For the last period, DB uses this formula:((cost – total depreciation from prior periods) * rate * (12 – month)) / 12

Example of DB function

Steps to follow:

1. Open a new Excel worksheet.

2. Copy data in the following table below and paste it in cell A1

Note: For formulas to show results, select them, press F2 key on your keyboard and then press Enter.

You can adjust the column widths to see all the data, if need be.

Data Description
$1,000,000 Initial cost
$100,000 Salvage value
6 Lifetime in years
Formula Description Result
=DB(A2,A3,A4,1,7) Depreciation in first year, with only 7 months calculated $186,083.33
=DB(A2,A3,A4,2,7) Depreciation in second year $259,639.42
=DB(A2,A3,A4,3,7) Depreciation in third year $176,814.44
=DB(A2,A3,A4,4,7) Depreciation in fourth year $120,410.64
=DB(A2,A3,A4,5,7) Depreciation in fifth year $81,999.64
=DB(A2,A3,A4,6,7) Depreciation in sixth year $55,841.76
=DB(A2,A3,A4,7,7) Depreciation in seventh year, with only 5 months calculated $15,845.10

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