Per the Instructions for Schedule K-1 (1065), page 18:
Code Z. Section 199A information. Generally, you may be allowed a deduction of up to 20% of your net qualified business income (QBI) plus 20% of your qualified REIT dividends, also known as section 199A dividends, and qualified PTP income from your partnership. The partnership will provide the information you need to figure your deduction. Use one of these forms to figure your QBI deduction.
See the instructions for additional information.
To enter the Qualified business income (QBI) information from Schedule K-1 in TaxAct: