As perhaps you have seen in the 1040 Instructions (page 87), line 8f on Schedule 1 (1040) is to be the sum of lines 16 and 20 from form 8889. But in your case, you report that 0 + 0 = 743, right?
As I said, I have not seen this happen before, is it possible that you have made multiple passes through the HSA interview, sometimes showing excess contributions and sometimes not? There is something that happens occasionally in that a number gets "stuck" in TurboTax and doesn't change when other numbers change around it. This creates nonsensical situations where numbers seem to come out of nowhere.
Also, please tell me that you are entering all HSA through the Step-by-Step process, not in Forms mode. Entering data in Forms mode for the HSA can easily lead to errors.
If you are willing, let's do an HSA RESET, to remove all HSA information from your return so you can start over. This is not a button, but a process.
***Reset***
1. make a copy of your W-2(s) (if you don't have the paper copies)
2. delete your W-2(s) (use the garbage can icon next to the W-2(s) on the Income screen)
*** Desktop***
3. go to View (at the top), choose Forms, and select the desired form(s) - 1099-SA (if one), 8889-T, and 8889-S (if one). Note the Delete Form button at the bottom of the screen.
*** Online ***
3. go to Tax Tools (on the left), and navigate to Tools->Delete a form
4. delete form(s) 1099-SA (if one), 8889-T, and 8889-S (if one)
5. go back and re-add your W-2(s), preferably adding them manually
6. go back and redo the entire HSA interview....
Let me know how this works for you.
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