TN does not have a State income tax so no income taxes should have been taken from his paycheck. You don't file a TN State Income Tax. If he is due any credits it will be on his Federal return. Being disabled does not mean you get a refund.
Disability tax credit
If you are permanently and totally disabled and have taxable disability income, you may qualify for the federal Tax Credit for the Elderly and Disabled. This credit is available only if a doctor has certified that your disability prevents you from working and that your condition is expected to last more than a year or result in your death. The size of your credit depends on how much taxable disability income you had as well as how much you received in nontaxable disability benefits. See IRS Publication 524 for more details.
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