Normally, he would not need to file a tax return unless he had unearned income of more than $2,600. Unearned income includes things like interest, dividends, capital gains, and taxable Social Security benefits.
If he has no unearned income, then he does not have a earned income reporting requirement for income above $14,600. If he had tax withheld from his income, he should file a tax return for a complete refund of those taxes that were withheld.
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