How do I calculate the Deduction for Qualified Business Income for each period listed?

[repjas26]

TT is asking for this info under "other tax situations" for 1/1/2018 to 3/31/2018, 1/1/2018 to 5/31/2018, and 1/1/2018 to 8/31/2018. It has already calculated the total deduction amount for the year.

[MaryEllen]

Look at the business income for each period and use that ratio - (QBI for the year / Bus income for the year) X Bus income for the period. 

or

Total QBI for the year / 12 X number of months (either 3, 5 or 😎

[Lisa22]

I believe the 2nd equation should be (QBI for the year / 12) x number of months