First, where is TurboTax displaying this "additional deduction"? Is it on a tax form or on one of the summary screens in the interview? I want to make sure if there is an actual issue with your tax return.
If you want to remove all HSA data from your return to start over or just continue on with your return, please do an HSA Reset (see below). Note that if you have an MSA rather than an HSA, you'll need to delete form 8853 along with the forms listed below.
HSA RESET
***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/Windows***
3. Go to the upper right and click on Forms, and
4. Select the desired form (1099-SA (if one), 8889-T, and 8889-S (if one)). Note the Delete Form button at the bottom of the form’s screen.
*** Desktop/Mac***
3. Switch to Forms Mode by selecting the Forms icon.
4. From the menu, select the form (1099-SA (if one), 8889-T, and 8889-S (if one)) you want to remove (if you don't see it, select Open Form at the top). From the Forms menu, select Remove [form name].
*** 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 or just continue with your return.
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