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@HOPE2 wrote:

I am not sure wave election was made by pervious tax man for carryback in 2019 when client had NOL and QBI loss. Since client new for me, how can I find out regarding the election if it was made in 2019 return?

should I consider QBI loss for two years, 2019 and 2020 as well? I mean should both carryforward to 2021 return.

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Do you have a copy of the 2019 and 2020 tax returns?  If so, you should see that statement to "Waive the Carryback"  (it should be on  a separate piece of paper).

If you have the returns and don't see the statement, then the election was not made.

Assuming the election was not made, then the next step is to determine if Form 1045 was filed to claim the NOL.  It would have been a separate filing, and the taxpayer would have received a separate return, so the taxpayer should hopefully know if that was done.  My first guess it that is was NOT.

Assuming that is the case, then the 2019 NOL is carried BACK to 2014, and you need to amend the 2014 return to claim the NOL (and if 2014 does not use up the NOL, it would be carried to 2015, then 2016, etc.).

For QBI, yes, you need to carry forward all QBI losses.