What is the AGI limit above which each of the following taxpayers would not be eligible to receive a credit for the elderly or the disabled? AGI Upper Limit a. A single taxpayer eligible for the credit who receives $1,300 of nontaxable social security benefits Taxpayers filing a joint return for which one taxpayer is eligible for the credit and the b. taxpayers have received no social security benefits. Taxpayers filing a joint return, and both are eligible for the credit and received $3,300 of nontaxable social security benefits. C