You can use the calculations below to determine how much of your SSDI is taxable. But it looks like about 50% may be taxable. If you enter it all into TurboTax you will come up with the exact amount.
Your adjusted gross income
+ Nontaxable interest
+ ½ of your Social Security benefits
= Your "combined income"
https://www.ssa.gov/planners/taxes.html
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