1. Benefit- increased deduction. Possibly credit for the disabled and/or child care credit. Child care credit would not be allowed unless you marked disabled without employment income. See About Form 2441, Child and Dependent Care Expenses and About Schedule R (Form 1040), Credit for the Elderly or the Disabled
2. You don't need a doctor's letter to file your return. If the IRS asks for substantiation, then you would need to provide proof.
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