The U.S. IRS and Treasury have issued final regulations on the Qualified Business Income Deduction (TD 9899). The regulations were published in the Federal Register on 25 June 2020 and are effective 24 August 2020. --- SUMMARY: This document contains final regulations concerning the deduction for qualified business income (QBI) under section 199A of the Internal Revenue Code (Code). The regulations will affect certain individuals, partnerships, S corporations, trusts, and estates. The regulations provide guidance on the treatment of previously suspended losses included in qualified business income. The regulations also provide guidance on the determination of the section 199A deduction...