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Annual Depreciation Expense = (Cost of Asset – Salvage Value)/Estimate Useful Life

Example:  A machine costs $75,000 to purchase and has estimated useful life of five years, upon which time it will have an estimated salvage value of $5,000.  Using the formula above, we can determine that annual depreciation will be $14,000 per year.  ($75,000-$5,000)/5 Years = $14,000.  The effect of the half year averaging convention is to reduce the first year depreciation by 1/2.  Therefore, the 1st year’s depreciation of $14,000 will be reduced to $7,000  The simplicity of this calculation is why many prefer to use this method.

(Cost – Salvage)/Recover Period
($75,000 – $5,000)/5=$14,000 with half year convention.
Note:  $14,000 in this example is normal annual depreciation.  Based on the following assumptions, the allowed depreciation is:
-Tax/accounting year end of 12/31
-Annual depreciation of $14,000
-With half year convention, 1/2 or $7,000 is allowed.


Acquired in January =$7,000/12=$583.33 per month allowedAcquired in March = $7,000/10=$700 per month allowedAcquired in August=$7,000/5=$1,400 per month allowedAcquired in December=$7,000/1=$7,000 for the month of December