Enter the total amount of depreciation and the cost of certain property that the business elected to expense under section 179 from Form 4562. Section 179 is an immediate expense deduction business owners take for purchases of depreciable business equipment instead of capitalizing an asset.Section 179 is a tax code section that allows businesses to deduct the total cost of equipment they bought during the year from their taxable income. Use Schedule C (Form 1040) to report income or (loss) from a business you operated or a profession you practiced as a sole proprietor. Section 179 allows eligible businesses to deduct the full purchase price of qualifying equipment in the year it was put into service. Section 179 of the IRS tax code allows businesses to fully write off the cost of certain equipment for the year it was purchased or leased.