The qualified business income deduction would not be added to your income for any reason. It appears on line 13 of your form 1040 and would be subtracted from your adjusted gross income listed on line 11. It does not have a negative sign next to it, so it may appear as an addition but it is a subtraction from income:

You can look at your Form 1040 to verify this:
To view your form 1040 and schedule 1 to 3:
- Choose Tax Tools from your left menu bar in TurboTax Online while working in your program
- Choose Tools
- Choose View Tax Summary
- See the Preview my 1040 option in the left menu bar and click on it
- Choose the Back option in the left menu bar when you are done
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