I misread instructions and failed to report income on sale of my primary residence. The gain on the sale was less that the minimum so it made no difference in my AGI. When I recognized the omission I went through the process of filling out an amended return on Turbotax. The resulting1040X, amended return, showed my "original amount" AGI as $3600 dollars below AGI as reported on my original 1040. It then showed the "net change" as $3600 and the "corrected amount" as the same as on my origional 1040. So the income was the same on both 1040s, but the amount of tax I owed was $850, in addition to what I already paid. Does this have something to do with the stimulus payments of $3600 I received, and since the sale of another property put me over the top limit for receiving the full amount, the $850 is what I have to return. I called Turbotax, and they were not able to answer this question. The 1040X has no worksheets that explain this change.
