Straight line method

 

This method is the simplest of all depreciation methods. Depreciation for each time period (timescale units) will be calculated by dividing acquisition cost by depreciation period. If asset has salvage value, it should be considered while calculating depreciation.

Without Salvage

 

Timescale Units

Formula to Calculate Depreciation per Period

Monthly

Acquisition Cost / (Depreciation Period * 12)

Quarterly

Acquisition Cost / (Depreciation Period * 4)

Yearly

Acquisition Cost / (Depreciation Period * 1)

With Salvage

 

Timescale Units

Formula to Calculate Depreciation per Period

Monthly

(Acquisition Cost – Salvage Value) / (Depreciation Period * 12)

Quarterly

(Acquisition Cost – Salvage Value) / (Depreciation Period * 4)

Yearly

(Acquisition Cost – Salvage Value) / (Depreciation Period * 1)

Net Book Value = Starting Book Value – Current Period Depreciation

Starting Book Value = Net Book Value of Previous Period

Starting Book Value of First Period = Acquisition Cost

Example

An asset with an original cost of $3,000 is depreciated yearly over three years beginning January 1, 2006, using the straight line method with no salvage value.

Depreciation beginning January 1, 2006 means that the acquisition date is 12/31/2006. This can be the purchase date of an asset or when the asset was put into service.
The asset form is updated with current period depreciation, net book value, and cumulative depreciation periodically based on timescale units. If the timescale units are years, these data elements on the asset detail form should be updated every year with the calculated values displayed on the depreciation sheet. In the this example, the asset detail form will be updated every January.

The depreciation table would look like this:

 

Period

Starting Book Value

Current Period Depreciation

Net Book Value

Cumulative Depreciation

12/31/2006

3000 (Acquisition Cost)

1000

2000 (3000-2000)

1000

12/31/2007

2000 (Previous Net Book Value)

1000

1000 (2000-1000)

2000

12/31/2008

1000 (Previous Net Book Value)

1000

0 (1000-1000)

3000

 

 

 

 


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