Dear Ms. Flores,
No claimant is eligible to receive back pay for those months in which they are engaged in what the SSA refers to as "Substantial Gainful Activity" -- which means months in which your father earned more than very minimal wages. You can access the chart for wage thresholds on the ssa.gov website. If your father earned enough to be paying taxes, then he was likely gainfully employed by their standard.
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Answered on Jul 18th, 2014 at 6:20 AM