rental income, 1099 income, REIT, partnership taxes, k-1's are all placed QBI could come from. There is a question during the interview about if it is eligible for QBI. If you received a 1099 DIV with an amount in Box 5 as the dividends from a REIT can be included in the calculation. Another possibility is if you had any 1099 MISC income with an amount in box 7 (non employee compensation), the IRS requires that income reported on Schedule C and it would be included in the QBI deduction calculation.
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