Stop Taxing Death and Disability Act This bill amends the Internal Revenue Code to exclude from the gross income of an individual the discharge of student loans or private education loans due to the death or disability of the student. The bill also amends the Higher Education Act of 1965 to require the Department of Education (ED) to discharge the liability on loans that parents received on behalf of a student who: (1) has become permanently and totally disabled, or (2) is unable to engage in any substantial gainful activity due to a physical or mental impairment that can be expected to result in death or has lasted or is expected to last continuously for at least 60 months. (Under current law, ED is required to discharge the loans to parents if the student dies.)