Can I claim interest I paid on my grandsons student loan even though he is not my dependent I am a cosigner and responsible for the payment

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If you are a co-signer and responsible for payment, and you paid the loan, you can deduct up to $2,500 of interest, if you qualify.  To qualify, you can't be married filing separate and you cannot have modified adjusted gross income (MAGI) greater than $165,000 if married filing a joint return, or $80,000 if single, head of household, or qualifying widow(er).