You can enter an adjustment as a negative number as follows:
1. Go to the "Federal" section of TurboTax
2. Click on "Income and Expenses"
3. Find "Less Common Income" and choose the last entry "Miscellaneous Income"
4. On the next screen, "Miscellaneous Income" choose the last entry "Other Reportable Income"
5. Enter a description for your entry (Disability Inc Adj), and enter the taxable amount you want to exclude from income as a negative number
4.
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