
Section 163(j) Interest Expense Limitation: 30% ATI, the Small Business Exemption, and the Real Property Trade Election
Section 163(j) caps the business interest deduction at 30% of adjusted taxable income, and OBBBA restored the EBITDA-style add-back for tax years beginning after December 31, 2024. This guide walks through the calculation, the small business exemption under Section 448(c), the irrevocable real property trade or business election, the partnership EBIE basis trap, and the Form 8990 reporting choreography.










