Definition:
Bonus depreciation is a method of accelerated depreciation which allows a business to make an additional deduction of 50% of the cost of qualifying property in the year in which it is put into service. The IRS says:
This special “bonus depreciation” allowance is available to all businesses and applies to most types of tangible personal property and computer software acquired and placed in service in 2008[and 2009]. It allows taxpayers to deduct 50 percent of the cost of qualifying property in addition to the regular depreciation allowance that is normally available.Unless this special bonus depreciation is extended, it will not be available after December 31, 2009.
Use IRS Form 4562 to record bonus depreciation and other types of depreciation and amortization.

