Yes, Social Security Disability Income (SSDI) can be subject to tax, although this will depend on your overall income level. In case SSDI is your sole source of income, you typically will not be required to pay taxes on it. On the other hand, if you have additional income sources (such as employment, pension, or your spouse's income), and your total income surpasses IRS thresholds, then as much as 50% or 85% of your SSDI benefits could be considered taxable.