Per the Instructions for Schedule K-1 (1120S), page 20:
Code V. 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 publicly traded partnerships (PTP) income from your S corporation. The S corporation will provide the information you need to figure your deduction. You will use one of these two forms to figure your QBI deduction.
QBI pass-through entity reporting information. Use the information provided to you by your S corporation to complete the appropriate form identified above.
QBI or qualified PTP items subject to shareholder-specific determinations. The amounts reported to you reflect your pro rata share of items from the S corporation’s trade(s) or business(es), or aggregation(s) and may include items that aren’t includible in your calculation of the QBI deduction. When determining QBI or qualified PTP income, you must include only those items that are qualified items of income, gain, deduction, and loss included or allowed in determining taxable income for the tax year. To determine your QBI or your qualified PTP income amounts and for information on where to report them, see the instructions for Form 8995 or Form 8995-A.
To enter qualified business income in TaxAct: