In 2017, the Tax Cuts and Jobs Act (TCJA) imposed a business interest expense deduction limitation on corporate taxpayers. The new section of the tax code, Section 163(j), limits the current year deduction to the sum of the following: -Taxpayer's business interest income for the tax year -30% of the adjusted taxable income (ATI) for the year, plus -Floor plan financing interest for the taxpayer in the given year Any current year excess is carried forward to the next tax year.