Section 179 of the tax code allows business taxpayers to deduct the cost of certain property as an expense when the property is first placed in service. Under Section 179, businesses can deduct a set amount of the cost of new business assets, giving purchasers more flexibility on when they take the deduction.Section 179 allows eligible businesses to deduct the full purchase price of qualifying equipment in the year it was put into service. IRS Section 179 allows businesses to deduct the full purchase price of qualifying equipment and software. Learn more about this tax code. Section179.Org is a free resource answering Section 179 questions, with tools and information on how businesses can benefit from the Section 179 Tax Deduction. To elect to take the Section 179 Deduction, simply fill out Part 1 of IRS form 4562, and attach it to your tax return. When looking at form 4797, it put the sale price of the piece of equipment as a gain on sell of asset.