I have a favorable adjustment on a form 8986. Since asking the question I've found another CPA who is going to advise on the procedure for reporting the decrease in tax. None of it is addressed in ProSeries I've found. We're making it up as we go.....it's an adjustment to 2018 which gets reported on the 2020 tax return. So I know I will have to complete and 8878s to the 2020 return - just trying to figure out how to show the reduction in tax!