Solution :
QBI      300000     W-2 wages    40000
Taxable   3814000    QBP         10000
income
                   W-2 limit
Phase              greater of
out MFJ
Start      315000    50% of W-2    20000
Finish     415000   or 25% of W-2   10250
                 + 2.5% of QBP
                 Selected       20000   Being higher    As part 1
Taxable income above phase out
[tex]$\frac{381,400-315000}{100000}$[/tex] Â Â Â Â 66%
Now applying gross deduction and phase out
Gross deduction     Being 20% of QBI    = 66000
Less : wage limit of QBI Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â - 20000
Phase out % Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â x 66%
Phase out amount                      30,360
Final deduction = gross deduction- phase out amount
             = 66,000 - 30,360
             = 35,640