From the IRS — and quite important for the current tax season:
Final regulations on both the §199A qualified business income deduction and §965 transition tax were issued in February 2019. The 2018 instructions for Schedule K-1 (Form 1120S) and instructions for Form 1120S have been revised to provide additional instructions based on these final regulations.
If you viewed or downloaded the 2018 instructions for Schedule K-1 (Form 1120S) or instructions for Form 1120S before Feb. 21, 2019, please note that your instructions are outdated.