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There is no form for reporting interest paid on a private mortgage. Form 1099-INT is for reporting interest that the person received as income, not interest that they paid. Banks and other commercial lenders use Form 1098 to report mortgage interest paid, but you do not send a Form 1098 unless you are in the business of making mortgage loans. Your relative does not have to provide proof with their tax return for the mortgage interest deduction. They just report the amount on Schedule A line 8b, which is for home mortgage interest that was not reported on Form 1098. They do not have to provide proof unless the IRS asks for it. You can give them a simple statement of the amount of interest that they paid, in any format that you like, in case they get audited. Note that the relative cannot deduct the mortgage interest unless the loan is secured by the home and the mortgage agreement is recorded with the appropriate local or state government authority. See "Secured Debt" in IRS Publication 936, Home Mortgage Interest Deduction, for details. Did you sell the home to your relative, or just lend them the money to buy it? There are some additional requirements for reporting interest on a seller-financed loan.