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No, the car loan will stay on your report for 10 ears after it is paid, so it won't effect your AAoA.
Well personally you should file taxes anyways... Just because you dont pay taxes on your income does not mean you wouldnt be entitled to a refund. But in the same case it doesnt relieve you from having to pay taxes either.
When collecting SSD your income is raised up to a lot as if you were being taxed on your income and give you a gross amount.