"Let see the QBI is $3000 in total. How or should we split it to $1500 for each of us."
QBI (the deduction) should follow the income that generated it.
Do you know what income was eligible for QBI? If only one of you had income that qualified for QBI, then the entire $3,000 should go to that person. Otherwise, make some notes for your tax file to try to establish a ratio of one spouse's QBI income to the other spouse's and allocate it that way. Just write down what you did and why so that if anyone ever asks you, you have a ready answer (ready answers at the least tell an auditor that you thought about it).
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