Businesses that buy new equipment can take the Section 179 Deduction on their taxes. The Internal Revenue Service (IRS) manages this program.When looking at form 4797, it put the sale price of the piece of equipment as a gain on sell of asset. Vehicles used in your business generally qualify for a Section 179 deduction. The passthrough entity must first recompute the depreciation on all Sec. When you dispose of an asset with a section 179 expense deduction, the disposition isn't included on Form 4684, 4797, 6252, or 8824. Section 179 allows eligible businesses to deduct the full purchase price of qualifying equipment in the year it was put into service. This requires adjustments in the gain or loss on the sale or disposition of those assets. Instead of depreciating the asset over a period of years, Section 179 allows you to deduct the full capital cost in the year that you buy it.