George, thank you for the explanation that I enter income "up to the period" for each column.  I see form 2210 then annualizes for me.  I'm intrigued by how you omit the offending item and then enter computed without the item for the three periods.  What are you doing with the actual amount? Is it one entry in the 3rd column 1/1/18 - 8/31/18 so that the actual item is weighted heavier later?