If you're on disability do I file taxes

Payments you received from a disability insurance policy that you paid the premiums for are not earned income.

A part of your social security benefits and SS disability may be taxable if half of the SS benefits plus your other income exceeds the base amount. Read Social Security Income and Disability Benefits Your U.S. Tax Return: The U.S. Income Tax Topics 1

Only if you are doing so to qulaify for an economic stimulus rebate.