Section 199A is referring to Qualified Business Income (QBI). That applies to most business that are partnerships and S corporations. If your business income qualifies as QBI, the applicable income would be entered in box 17 with a code of V. So, TurboTax is asking for the income reported on the K-1 form that is QBI income. It is often the amount reported as income in lines 1 through 3 on the K-1 schedule. It can be positive or negative. You may have to ask the issuer of the K-1 schedule for clarification to determine what to enter for the QBI.
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