If you have an installment sale from a seller-financed mortgage, you will need to enter the details of the sale in the first year. After everything is set up in the first year, then you will just need to enter the payments received split between interest and principal; and send a 1099-INT to the buyer. This needs to be sent to the IRS along with Form 1096 too.
See this TurboTax article about an installment sale and how to initially set this up in the tax return.
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