If your parent is disabled they are probably receiving some type of untaxable assistance (SSI, Worker’s Comp, etc.). This is still considered income and must be reported on the FAFSA. It is reported under Worksheet A or B, depending on the type of income. Because this is not taxable income, it would not have been listed on your parents taxes if your other parent filed, so you would need to collect year-end statements and/or check stubs to determine the amount of benefit received for the calendar year in question.

People tend to receive much less than they made in earnings in either SSI or Worker’s Comp, so chances are the income will not be high enough to make you ineligible for aid, but it is hard to say for sure without knowing your other parents income, your family size, number in college, assets, etc.